feature3 cursor bug fixed WARNING MIGHT BE BREAKING IF PROBLEMS, CHECK THIS COMMIT but it should be safe imo

Cargo.lock

@@ -384,9 +384,9 @@ dependencies = [
 
 [[package]]
 name = "bon"
-version = "3.6.4"
+version = "3.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f61138465baf186c63e8d9b6b613b508cd832cba4ce93cf37ce5f096f91ac1a6"
+checksum = "33d9ef19ae5263a138da9a86871eca537478ab0332a7770bac7e3f08b801f89f"
 dependencies = [
  "bon-macros",
  "rustversion",
@@ -394,11 +394,11 @@ dependencies = [
 
 [[package]]
 name = "bon-macros"
-version = "3.6.4"
+version = "3.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40d1dad34aa19bf02295382f08d9bc40651585bd497266831d40ee6296fb49ca"
+checksum = "577ae008f2ca11ca7641bd44601002ee5ab49ef0af64846ce1ab6057218a5cc1"
 dependencies = [
- "darling",
+ "darling 0.21.0",
  "ident_case",
  "prettyplease",
  "proc-macro2",
@@ -475,9 +475,11 @@ name = "canvas"
 version = "0.4.2"
 dependencies = [
  "anyhow",
+ "async-trait",
  "common",
  "crossterm",
  "ratatui",
+ "regex",
  "serde",
  "thiserror",
  "tokio",
@@ -496,18 +498,18 @@ checksum = "df8670b8c7b9dae1793364eafadf7239c40d669904660c5960d74cfd80b46a53"
 
 [[package]]
 name = "castaway"
-version = "0.2.3"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0abae9be0aaf9ea96a3b1b8b1b55c602ca751eba1b1500220cea4ecbafe7c0d5"
+checksum = "dec551ab6e7578819132c713a93c022a05d60159dc86e7a7050223577484c55a"
 dependencies = [
  "rustversion",
 ]
 
 [[package]]
 name = "cc"
-version = "1.2.29"
+version = "1.2.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c1599538de2394445747c8cf7935946e3cc27e9625f889d979bfb2aaf569362"
+checksum = "deec109607ca693028562ed836a5f1c4b8bd77755c4e132fc5ce11b0b6211ae7"
 dependencies = [
  "jobserver",
  "libc",
@@ -652,9 +654,9 @@ checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
 [[package]]
 name = "const_panic"
-version = "0.2.12"
+version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2459fc9262a1aa204eb4b5764ad4f189caec88aea9634389c0a25f8be7f6265e"
+checksum = "b98d1483e98c9d67f341ab4b3915cfdc54740bd6f5cccc9226ee0535d86aa8fb"
 
 [[package]]
 name = "core-foundation"
@@ -713,9 +715,9 @@ checksum = "19d374276b40fb8bbdee95aef7c7fa6b5316ec764510eb64b8dd0e2ed0d7e7f5"
 
 [[package]]
 name = "crc32fast"
-version = "1.4.2"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a97769d94ddab943e4510d138150169a2758b5ef3eb191a9ee688de3e23ef7b3"
+checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511"
 dependencies = [
  "cfg-if",
 ]
@@ -810,8 +812,18 @@ version = "0.20.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc7f46116c46ff9ab3eb1597a45688b6715c6e628b5c133e288e709a29bcb4ee"
 dependencies = [
- "darling_core",
+ "darling_core 0.20.11",
- "darling_macro",
+ "darling_macro 0.20.11",
+]
+
+[[package]]
+name = "darling"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a79c4acb1fd5fa3d9304be4c76e031c54d2e92d172a393e24b19a14fe8532fe9"
+dependencies = [
+ "darling_core 0.21.0",
+ "darling_macro 0.21.0",
 ]
 
 [[package]]
@@ -828,13 +840,38 @@ dependencies = [
  "syn 2.0.104",
 ]
 
+[[package]]
+name = "darling_core"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74875de90daf30eb59609910b84d4d368103aaec4c924824c6799b28f77d6a1d"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn 2.0.104",
+]
+
 [[package]]
 name = "darling_macro"
 version = "0.20.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc34b93ccb385b40dc71c6fceac4b2ad23662c7eeb248cf10d529b7e055b6ead"
 dependencies = [
- "darling_core",
+ "darling_core 0.20.11",
+ "quote",
+ "syn 2.0.104",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e79f8e61677d5df9167cd85265f8e5f64b215cdea3fb55eebc3e622e44c7a146"
+dependencies = [
+ "darling_core 0.21.0",
  "quote",
  "syn 2.0.104",
 ]
@@ -958,7 +995,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "778e2ac28f6c47af28e4907f13ffd1e1ddbd400980a9abd7c8df189bf578a5ad"
 dependencies = [
  "libc",
- "windows-sys 0.60.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1429,9 +1466,9 @@ dependencies = [
 
 [[package]]
 name = "hyper-util"
-version = "0.1.15"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f66d5bd4c6f02bf0542fad85d626775bab9258cf795a4256dcaf3161114d1df"
+checksum = "8d9b05277c7e8da2c93a568989bb6207bef0112e8d17df7a6eda4a3cf143bc5e"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -1442,7 +1479,7 @@ dependencies = [
  "hyper",
  "libc",
  "pin-project-lite",
- "socket2",
+ "socket2 0.6.0",
  "tokio",
  "tower-service",
  "tracing",
@@ -1611,9 +1648,9 @@ dependencies = [
 
 [[package]]
 name = "im-lists"
-version = "0.9.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88485149c4fcec01ebce4e4b8284a3c75b3d8a4749169f5481144e6433e9bcd2"
+checksum = "8b971d2652e5700514cc92ca020dba64c790352af0ff2b9acb7514868a32d6aa"
 dependencies = [
  "smallvec",
 ]
@@ -1670,11 +1707,11 @@ dependencies = [
 
 [[package]]
 name = "instability"
-version = "0.3.7"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0bf9fed6d91cfb734e7476a06bde8300a1b94e217e1b523b6f0cd1a01998c71d"
+checksum = "435d80800b936787d62688c927b6490e887c7ef5ff9ce922c6c6050fca75eb9a"
 dependencies = [
- "darling",
+ "darling 0.20.11",
  "indoc",
  "proc-macro2",
  "quote",
@@ -1683,9 +1720,9 @@ dependencies = [
 
 [[package]]
 name = "io-uring"
-version = "0.7.8"
+version = "0.7.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b86e202f00093dcba4275d4636b93ef9dd75d025ae560d2521b45ea28ab49013"
+checksum = "d93587f37623a1a17d94ef2bc9ada592f5465fe7732084ab7beefabe5c77c0c4"
 dependencies = [
  "bitflags",
  "cfg-if",
@@ -1802,9 +1839,9 @@ checksum = "f9fbbcab51052fe104eb5e5d351cf728d30a5be1fe14d9be8a3b097481fb97de"
 
 [[package]]
 name = "libredox"
-version = "0.1.4"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1580801010e535496706ba011c15f8532df6b42297d2e471fec38ceadd8c0638"
+checksum = "4488594b9328dee448adb906d8b126d9b7deb7cf5c22161ee591610bb1be83c0"
 dependencies = [
  "bitflags",
  "libc",
@@ -1902,9 +1939,9 @@ checksum = "32a282da65faaf38286cf3be983213fcf1d2e2a58700e808f83f4ea9a4804bc0"
 
 [[package]]
 name = "memmap2"
-version = "0.9.5"
+version = "0.9.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fd3f7eed9d3848f8b98834af67102b720745c4ec028fcd0aa0239277e7de374f"
+checksum = "483758ad303d734cec05e5c12b41d7e93e6a6390c5e9dae6bdeb7c1259012d28"
 dependencies = [
  "libc",
 ]
@@ -2292,17 +2329,16 @@ checksum = "7edddbd0b52d732b21ad9a5fab5c704c14cd949e5e9a1ec5929a24fded1b904c"
 
 [[package]]
 name = "polling"
-version = "3.8.0"
+version = "3.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b53a684391ad002dd6a596ceb6c74fd004fdce75f4be2e3f615068abbea5fd50"
+checksum = "8ee9b2fa7a4517d2c91ff5bc6c297a427a96749d15f98fcdbb22c05571a4d4b7"
 dependencies = [
  "cfg-if",
  "concurrent-queue",
  "hermit-abi",
  "pin-project-lite",
- "rustix 1.0.7",
+ "rustix 1.0.8",
- "tracing",
+ "windows-sys 0.60.2",
- "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -2342,9 +2378,9 @@ dependencies = [
 
 [[package]]
 name = "prettyplease"
-version = "0.2.35"
+version = "0.2.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "061c1221631e079b26479d25bbf2275bfe5917ae8419cd7e34f13bfc2aa7539a"
+checksum = "ff24dfcda44452b9816fff4cd4227e1bb73ff5a2f1bc1105aa92fb8565ce44d2"
 dependencies = [
  "proc-macro2",
  "syn 2.0.104",
@@ -2506,9 +2542,9 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.9.1"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9fbfd9d094a40bf3ae768db9361049ace4c0e04a4fd6b359518bd7b73a73dd97"
+checksum = "6db2770f06117d490610c7488547d543617b21bfa07796d7a12f6f1bd53850d1"
 dependencies = [
  "rand_chacha 0.9.0",
  "rand_core 0.9.3",
@@ -2614,9 +2650,9 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.5.13"
+version = "0.5.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d04b7d0ee6b4a0207a0a7adb104d23ecb0b47d6beae7152d0fa34b692b29fd6"
+checksum = "7e8af0dde094006011e6a740d4879319439489813bd0bcdc7d821beaeeff48ec"
 dependencies = [
  "bitflags",
 ]
@@ -2845,20 +2881,20 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys 0.4.15",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
 name = "rustix"
-version = "1.0.7"
+version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c71e83d6afe7ff64890ec6b71d6a69bb8a610ab78ce364b3352876bb4c801266"
+checksum = "11181fbabf243db407ef8df94a6ce0b2f9a733bd8be4ad02b4eda9602296cac8"
 dependencies = [
  "bitflags",
  "errno",
  "libc",
  "linux-raw-sys 0.9.4",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -2962,9 +2998,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.140"
+version = "1.0.141"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "20068b6e96dc6c9bd23e01df8827e6c7e1f2fddd43c21810382803c136b99373"
+checksum = "30b9eff21ebe718216c6ec64e1d9ac57087aad11efc64e32002bce4a0d4c03d3"
 dependencies = [
  "itoa",
  "memchr",
@@ -3008,7 +3044,7 @@ dependencies = [
  "lazy_static",
  "prost",
  "prost-types",
- "rand 0.9.1",
+ "rand 0.9.2",
  "regex",
  "rstest",
  "rust-stemmers",
@@ -3172,6 +3208,16 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "socket2"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "233504af464074f9d066d7b5416c5f9b894a5862a6506e306f7b816cdd6f1807"
+dependencies = [
+ "libc",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "spin"
 version = "0.9.8"
@@ -3446,7 +3492,7 @@ dependencies = [
  "parking_lot",
  "polling",
  "quickscope",
- "rand 0.9.1",
+ "rand 0.9.2",
  "serde",
  "serde_json",
  "smallvec",
@@ -3461,9 +3507,9 @@ dependencies = [
 
 [[package]]
 name = "steel-decimal"
-version = "1.0.0"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c43950a3eed43f3e9765a51f5dc1b0de5e1687ba824b8589990747d9ba241187"
+checksum = "4cd8a6d1a41d2146705b29292cac75c78a3e32d7b6cabb72d808209546615f37"
 dependencies = [
  "regex",
  "rust_decimal",
@@ -3598,9 +3644,9 @@ dependencies = [
 
 [[package]]
 name = "tantivy"
-version = "0.24.1"
+version = "0.24.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca2374a21157427c5faff2d90930f035b6c22a5d7b0e5b0b7f522e988ef33c06"
+checksum = "64a966cb0e76e311f09cf18507c9af192f15d34886ee43d7ba7c7e3803660c43"
 dependencies = [
  "aho-corasick",
  "arc-swap",
@@ -3757,8 +3803,8 @@ dependencies = [
  "fastrand",
  "getrandom 0.3.3",
  "once_cell",
- "rustix 1.0.7",
+ "rustix 1.0.8",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -3872,7 +3918,7 @@ dependencies = [
  "pin-project-lite",
  "signal-hook-registry",
  "slab",
- "socket2",
+ "socket2 0.5.10",
  "tokio-macros",
  "windows-sys 0.52.0",
 ]
@@ -3986,7 +4032,7 @@ dependencies = [
  "percent-encoding",
  "pin-project",
  "prost",
- "socket2",
+ "socket2 0.5.10",
  "tokio",
  "tokio-stream",
  "tower",
@@ -4275,7 +4321,7 @@ version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7df16e474ef958526d1205f6dda359fdfab79d9aa6d54bafcb92dcd07673dca"
 dependencies = [
- "darling",
+ "darling 0.20.11",
  "once_cell",
  "proc-macro-error2",
  "proc-macro2",
@@ -4403,7 +4449,7 @@ checksum = "24d643ce3fd3e5b54854602a080f34fb10ab75e0b813ee32d00ca2b44fa74762"
 dependencies = [
  "either",
  "env_home",
- "rustix 1.0.7",
+ "rustix 1.0.8",
  "winsafe",
 ]
 
@@ -4439,7 +4485,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
 dependencies = [
- "windows-sys 0.59.0",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -4730,9 +4776,9 @@ checksum = "271414315aff87387382ec3d271b52d7ae78726f5d44ac98b4f4030c91880486"
 
 [[package]]
 name = "winnow"
-version = "0.7.11"
+version = "0.7.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74c7b26e3480b707944fc872477815d29a8e429d2f93a1ce000f5fa84a15cbcd"
+checksum = "f3edebf492c8125044983378ecb5766203ad3b4c2f7a922bd7dd207f6d443e95"
 dependencies = [
  "memchr",
 ]

canvas/.gitignore

@@ -0,0 +1 @@
+docs_prompts/

canvas/Cargo.toml

@@ -12,16 +12,18 @@ categories.workspace = true
 [dependencies]
 common = { path = "../common" }
 ratatui = { workspace = true, optional = true }
-crossterm = { workspace = true }
+crossterm = { workspace = true, optional = true }
-anyhow = { workspace = true }
+anyhow.workspace = true
-tokio = { workspace = true }
+tokio = { workspace = true, optional = true }
 toml = { workspace = true }
-serde = { workspace = true }
+serde.workspace = true
 unicode-width.workspace = true
 thiserror = { workspace = true }
 
 tracing = "0.1.41"
 tracing-subscriber = "0.3.19"
+async-trait.workspace = true
+regex = { workspace = true, optional = true }
 
 [dev-dependencies]
 tokio-test = "0.4.4"
@@ -29,7 +31,20 @@ tokio-test = "0.4.4"
 [features]
 default = []
 gui = ["ratatui"]
+autocomplete = ["tokio"]
+cursor-style = ["crossterm"]
+validation = ["regex"]
 
 [[example]]
-name = "ratatui_demo"
+name = "autocomplete"
-path = "examples/ratatui_demo.rs"
+required-features = ["autocomplete", "gui"]
+path = "examples/autocomplete.rs"
+
+[[example]]
+name = "canvas_gui_demo"
+required-features = ["gui"]
+path = "examples/canvas_gui_demo.rs"
+
+[[example]]
+name = "validation_1"
+required-features = ["gui", "validation"]

canvas/docs/new_function_to_config.txt

@@ -1,77 +0,0 @@
-❯ git status
-On branch main
-Your branch is ahead of 'origin/main' by 1 commit.
-  (use "git push" to publish your local commits)
-
-Changes not staged for commit:
-  (use "git add <file>..." to update what will be committed)
-  (use "git restore <file>..." to discard changes in working directory)
-	modified:   src/canvas/actions/handlers/edit.rs
-	modified:   src/canvas/actions/types.rs
-
-no changes added to commit (use "git add" and/or "git commit -a")
-❯ git --no-pager diff
-diff --git a/canvas/src/canvas/actions/handlers/edit.rs b/canvas/src/canvas/actions/handlers/edit.rs
-index a26fe6f..fa1becb 100644
---- a/canvas/src/canvas/actions/handlers/edit.rs
-+++ b/canvas/src/canvas/actions/handlers/edit.rs
-@@ -29,6 +29,21 @@ pub async fn handle_edit_action<S: CanvasState>(
-             Ok(ActionResult::success())
-         }
-
-+        CanvasAction::SelectAll => {
-+            // Select all text in current field
-+            let current_input = state.get_current_input();
-+            let text_length = current_input.len();
-+
-+            // Set cursor to start and select all
-+            state.set_current_cursor_pos(0);
-+            // TODO: You'd need to add selection state to CanvasState trait
-+            // For now, just move cursor to end to "select" all
-+            state.set_current_cursor_pos(text_length);
-+            *ideal_cursor_column = text_length;
-+
-+            Ok(ActionResult::success_with_message(&format!("Selected all {} characters", text_length)))
-+        }
-+
-         CanvasAction::DeleteBackward => {
-             let cursor_pos = state.current_cursor_pos();
-             if cursor_pos > 0 {
-@@ -323,6 +338,13 @@ impl ActionHandlerIntrospection for EditHandler {
-             is_required: false,
-         });
-
-+        actions.push(ActionSpec {
-+            name: "select_all".to_string(),
-+            description: "Select all text in current field".to_string(),
-+            examples: vec!["Ctrl+a".to_string()],
-+            is_required: false, // Optional action
-+        });
-+
-         HandlerCapabilities {
-             mode_name: "edit".to_string(),
-             actions,
-diff --git a/canvas/src/canvas/actions/types.rs b/canvas/src/canvas/actions/types.rs
-index 433a4d5..3794596 100644
---- a/canvas/src/canvas/actions/types.rs
-+++ b/canvas/src/canvas/actions/types.rs
-@@ -31,6 +31,8 @@ pub enum CanvasAction {
-     NextField,
-     PrevField,
-
-+    SelectAll,
-+
-     // Autocomplete actions
-     TriggerAutocomplete,
-     SuggestionUp,
-@@ -62,6 +64,7 @@ impl CanvasAction {
-             "move_word_end_prev" => Self::MoveWordEndPrev,
-             "next_field" => Self::NextField,
-             "prev_field" => Self::PrevField,
-+            "select_all" => Self::SelectAll,
-             "trigger_autocomplete" => Self::TriggerAutocomplete,
-             "suggestion_up" => Self::SuggestionUp,
-             "suggestion_down" => Self::SuggestionDown,
-╭─      ~/Doc/p/komp_ac/canvas  on    main ⇡1 !2 
-╰─
-

canvas/examples/autocomplete.rs

@@ -0,0 +1,392 @@
+// examples/autocomplete.rs
+// Run with: cargo run --example autocomplete --features "autocomplete,gui"
+
+use std::io;
+use crossterm::{
+    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyModifiers},
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+};
+use ratatui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout},
+    style::Color,
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph},
+    Frame, Terminal,
+};
+
+use canvas::{
+    canvas::{
+        gui::render_canvas,
+        modes::AppMode,
+        theme::CanvasTheme,
+    },
+    autocomplete::gui::render_autocomplete_dropdown,
+    FormEditor, DataProvider, AutocompleteProvider, SuggestionItem,
+};
+
+use async_trait::async_trait;
+use anyhow::Result;
+
+// Simple theme implementation
+#[derive(Clone)]
+struct DemoTheme;
+
+impl CanvasTheme for DemoTheme {
+    fn bg(&self) -> Color { Color::Reset }
+    fn fg(&self) -> Color { Color::White }
+    fn accent(&self) -> Color { Color::Cyan }
+    fn secondary(&self) -> Color { Color::Gray }
+    fn highlight(&self) -> Color { Color::Yellow }
+    fn highlight_bg(&self) -> Color { Color::DarkGray }
+    fn warning(&self) -> Color { Color::Red }
+    fn border(&self) -> Color { Color::Gray }
+}
+
+// Custom suggestion data type
+#[derive(Clone, Debug)]
+struct EmailSuggestion {
+    email: String,
+    provider: String,
+}
+
+// ===================================================================
+// SIMPLE DATA PROVIDER - Only business data, no UI concerns!
+// ===================================================================
+
+struct ContactForm {
+    // Only business data - no UI state!
+    name: String,
+    email: String,
+    phone: String,
+    city: String,
+}
+
+impl ContactForm {
+    fn new() -> Self {
+        Self {
+            name: "John Doe".to_string(),
+            email: "john@".to_string(), // Partial email for demo
+            phone: "+1 234 567 8900".to_string(),
+            city: "San Francisco".to_string(),
+        }
+    }
+}
+
+// Simple trait implementation - only 4 methods!
+impl DataProvider for ContactForm {
+    fn field_count(&self) -> usize { 4 }
+    
+    fn field_name(&self, index: usize) -> &str {
+        match index {
+            0 => "Name",
+            1 => "Email", 
+            2 => "Phone",
+            3 => "City",
+            _ => "",
+        }
+    }
+    
+    fn field_value(&self, index: usize) -> &str {
+        match index {
+            0 => &self.name,
+            1 => &self.email,
+            2 => &self.phone,
+            3 => &self.city,
+            _ => "",
+        }
+    }
+    
+    fn set_field_value(&mut self, index: usize, value: String) {
+        match index {
+            0 => self.name = value,
+            1 => self.email = value,
+            2 => self.phone = value,
+            3 => self.city = value,
+            _ => {}
+        }
+    }
+    
+    fn supports_autocomplete(&self, field_index: usize) -> bool {
+        field_index == 1 // Only email field
+    }
+}
+
+// ===================================================================
+// SIMPLE AUTOCOMPLETE PROVIDER - Only data fetching!
+// ===================================================================
+
+struct EmailAutocomplete;
+
+#[async_trait]
+impl AutocompleteProvider for EmailAutocomplete {
+    type SuggestionData = EmailSuggestion;
+    
+    async fn fetch_suggestions(&mut self, _field_index: usize, query: &str) 
+        -> Result<Vec<SuggestionItem<Self::SuggestionData>>> 
+    {
+        // Extract domain part from email
+        let (email_prefix, domain_part) = if let Some(at_pos) = query.find('@') {
+            (query[..at_pos].to_string(), query[at_pos + 1..].to_string())
+        } else {
+            return Ok(Vec::new()); // No @ symbol
+        };
+
+        // Simulate async API call
+        let suggestions = tokio::task::spawn_blocking(move || {
+            // Simulate network delay
+            std::thread::sleep(std::time::Duration::from_millis(200));
+
+            // Mock email suggestions
+            let popular_domains = vec![
+                ("gmail.com", "Gmail"),
+                ("yahoo.com", "Yahoo Mail"),
+                ("outlook.com", "Outlook"),
+                ("hotmail.com", "Hotmail"),
+                ("company.com", "Company Email"),
+                ("university.edu", "University"),
+            ];
+
+            let mut results = Vec::new();
+            for (domain, provider) in popular_domains {
+                if domain.starts_with(&domain_part) || domain_part.is_empty() {
+                    let full_email = format!("{}@{}", email_prefix, domain);
+                    results.push(SuggestionItem {
+                        data: EmailSuggestion {
+                            email: full_email.clone(),
+                            provider: provider.to_string(),
+                        },
+                        display_text: format!("{} ({})", full_email, provider),
+                        value_to_store: full_email,
+                    });
+                }
+            }
+            results
+        }).await.unwrap_or_default();
+
+        Ok(suggestions)
+    }
+}
+
+// ===================================================================
+// APPLICATION STATE - Much simpler!
+// ===================================================================
+
+struct AppState {
+    editor: FormEditor<ContactForm>,
+    autocomplete: EmailAutocomplete,
+    debug_message: String,
+}
+
+impl AppState {
+    fn new() -> Self {
+        let contact_form = ContactForm::new();
+        let mut editor = FormEditor::new(contact_form);
+        
+        // Start on email field (index 1) at end of existing text
+        editor.set_mode(AppMode::Edit);
+        // TODO: Add method to set initial field/cursor position
+        
+        Self {
+            editor,
+            autocomplete: EmailAutocomplete,
+            debug_message: "Type in email field, Tab to trigger autocomplete, Enter to select, Esc to cancel".to_string(),
+        }
+    }
+}
+
+// ===================================================================
+// INPUT HANDLING - Much cleaner!
+// ===================================================================
+
+async fn handle_key_press(key: KeyCode, modifiers: KeyModifiers, state: &mut AppState) -> bool {
+    if key == KeyCode::F(10) || (key == KeyCode::Char('c') && modifiers.contains(KeyModifiers::CONTROL)) {
+        return false; // Quit
+    }
+
+    // Handle input based on key
+    let result = match key {
+        // === AUTOCOMPLETE KEYS ===
+        KeyCode::Tab => {
+            if state.editor.is_autocomplete_active() {
+                state.editor.autocomplete_next();
+                Ok("Navigated to next suggestion".to_string())
+            } else if state.editor.data_provider().supports_autocomplete(state.editor.current_field()) {
+                state.editor.trigger_autocomplete(&mut state.autocomplete).await
+                    .map(|_| "Triggered autocomplete".to_string())
+            } else {
+                state.editor.move_to_next_field();
+                Ok("Moved to next field".to_string())
+            }
+        }
+
+        KeyCode::Enter => {
+            if state.editor.is_autocomplete_active() {
+                if let Some(applied) = state.editor.apply_autocomplete() {
+                    Ok(format!("Applied: {}", applied))
+                } else {
+                    Ok("No suggestion to apply".to_string())
+                }
+            } else {
+                state.editor.move_to_next_field();
+                Ok("Moved to next field".to_string())
+            }
+        }
+
+        KeyCode::Esc => {
+            if state.editor.is_autocomplete_active() {
+                // Autocomplete will be cleared automatically by mode change
+                Ok("Cancelled autocomplete".to_string())
+            } else {
+                // Toggle between edit and readonly mode
+                let new_mode = match state.editor.mode() {
+                    AppMode::Edit => AppMode::ReadOnly,
+                    _ => AppMode::Edit,
+                };
+                state.editor.set_mode(new_mode);
+                Ok(format!("Switched to {:?} mode", new_mode))
+            }
+        }
+
+        // === MOVEMENT KEYS ===
+        KeyCode::Left => {
+            state.editor.move_left();
+            Ok("Moved left".to_string())
+        }
+        KeyCode::Right => {
+            state.editor.move_right();
+            Ok("Moved right".to_string())
+        }
+        KeyCode::Up => {
+            state.editor.move_to_next_field(); // TODO: Add move_up method
+            Ok("Moved up".to_string())
+        }
+        KeyCode::Down => {
+            state.editor.move_to_next_field(); // TODO: Add move_down method  
+            Ok("Moved down".to_string())
+        }
+
+        // === TEXT INPUT ===
+        KeyCode::Char(c) if !modifiers.contains(KeyModifiers::CONTROL) => {
+            state.editor.insert_char(c)
+                .map(|_| format!("Inserted '{}'", c))
+        }
+
+        KeyCode::Backspace => {
+            // TODO: Add delete_backward method to FormEditor
+            Ok("Backspace (not implemented yet)".to_string())
+        }
+
+        _ => Ok(format!("Unhandled key: {:?}", key)),
+    };
+
+    // Update debug message
+    match result {
+        Ok(msg) => state.debug_message = msg,
+        Err(e) => state.debug_message = format!("Error: {}", e),
+    }
+
+    true
+}
+
+async fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut state: AppState) -> io::Result<()> {
+    let theme = DemoTheme;
+
+    loop {
+        terminal.draw(|f| ui(f, &state, &theme))?;
+
+        if let Event::Key(key) = event::read()? {
+            let should_continue = handle_key_press(key.code, key.modifiers, &mut state).await;
+            if !should_continue {
+                break;
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn ui(f: &mut Frame, state: &AppState, theme: &DemoTheme) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Min(8),
+            Constraint::Length(5),
+        ])
+        .split(f.area());
+
+    // Render the canvas form - much simpler!
+    let active_field_rect = render_canvas(
+        f,
+        chunks[0],
+        &state.editor,
+        theme,
+    );
+
+    // Render autocomplete dropdown if active
+    if let Some(input_rect) = active_field_rect {
+        render_autocomplete_dropdown(
+            f,
+            chunks[0],
+            input_rect,
+            theme,
+            &state.editor,
+        );
+    }
+
+    // Status info
+    let autocomplete_status = if state.editor.is_autocomplete_active() {
+        if state.editor.ui_state().is_autocomplete_loading() {
+            "Loading suggestions..."
+        } else if !state.editor.suggestions().is_empty() {
+            "Use Tab to navigate, Enter to select, Esc to cancel"
+        } else {
+            "No suggestions found"
+        }
+    } else {
+        "Tab to trigger autocomplete"
+    };
+
+    let status_lines = vec![
+        Line::from(Span::raw(format!("Mode: {:?} | Field: {}/{} | Cursor: {}",
+            state.editor.mode(), 
+            state.editor.current_field() + 1, 
+            state.editor.data_provider().field_count(), 
+            state.editor.cursor_position()))),
+        Line::from(Span::raw(format!("Autocomplete: {}", autocomplete_status))),
+        Line::from(Span::raw(state.debug_message.clone())),
+        Line::from(Span::raw("F10: Quit | Tab: Trigger/Navigate autocomplete | Enter: Select | Esc: Cancel/Toggle mode")),
+    ];
+
+    let status = Paragraph::new(status_lines)
+        .block(Block::default().borders(Borders::ALL).title("Status & Help"));
+
+    f.render_widget(status, chunks[1]);
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    let state = AppState::new();
+    let res = run_app(&mut terminal, state).await;
+
+    disable_raw_mode()?;
+    execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    terminal.show_cursor()?;
+
+    if let Err(err) = res {
+        println!("{:?}", err);
+    }
+
+    Ok(())
+}

canvas/examples/canvas_cursor_auto.rs

@@ -0,0 +1,792 @@
+// examples/canvas-cursor-auto.rs
+//! Demonstrates automatic cursor management with the canvas library
+//!
+//! This example REQUIRES the `cursor-style` feature to compile.
+//! 
+//! Run with:
+//! cargo run --example canvas_cursor_auto --features "gui,cursor-style"
+//!
+//! This will fail without cursor-style:
+//! cargo run --example canvas-cursor-auto --features "gui"
+
+// REQUIRE cursor-style feature - example won't compile without it
+#[cfg(not(feature = "cursor-style"))]
+compile_error!(
+    "This example requires the 'cursor-style' feature. \
+     Run with: cargo run --example canvas-cursor-auto --features \"gui,cursor-style\""
+);
+
+use std::io;
+use crossterm::{
+    event::{
+        self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyModifiers,
+    },
+    execute,
+    terminal::{
+        disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
+    },
+};
+use ratatui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout},
+    style::{Color, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph},
+    Frame, Terminal,
+};
+
+use canvas::{
+    canvas::{
+        gui::render_canvas_default,
+        modes::{AppMode, ModeManager, HighlightState},
+        CursorManager, // This import only exists when cursor-style feature is enabled
+    },
+    DataProvider, FormEditor,
+};
+
+// Enhanced FormEditor that demonstrates automatic cursor management
+struct AutoCursorFormEditor<D: DataProvider> {
+    editor: FormEditor<D>,
+    has_unsaved_changes: bool,
+    debug_message: String,
+    command_buffer: String, // For multi-key vim commands like "gg"
+}
+
+impl<D: DataProvider> AutoCursorFormEditor<D> {
+    fn new(data_provider: D) -> Self {
+        Self {
+            editor: FormEditor::new(data_provider),
+            has_unsaved_changes: false,
+            debug_message: "🎯 Automatic Cursor Demo - cursor-style feature enabled!".to_string(),
+            command_buffer: String::new(),
+        }
+    }
+
+    // === COMMAND BUFFER HANDLING ===
+
+    fn clear_command_buffer(&mut self) {
+        self.command_buffer.clear();
+    }
+
+    fn add_to_command_buffer(&mut self, ch: char) {
+        self.command_buffer.push(ch);
+    }
+
+    fn get_command_buffer(&self) -> &str {
+        &self.command_buffer
+    }
+
+    fn has_pending_command(&self) -> bool {
+        !self.command_buffer.is_empty()
+    }
+
+    // === VISUAL/HIGHLIGHT MODE SUPPORT ===
+
+
+    fn enter_visual_mode(&mut self) {
+        // Use the library method instead of manual state setting
+        self.editor.enter_highlight_mode();
+        self.debug_message = "🔥 VISUAL MODE - Cursor: Blinking Block █".to_string();
+    }
+
+    fn enter_visual_line_mode(&mut self) {
+        // Use the library method instead of manual state setting  
+        self.editor.enter_highlight_line_mode();
+        self.debug_message = "🔥 VISUAL LINE MODE - Cursor: Blinking Block █".to_string();
+    }
+
+    fn exit_visual_mode(&mut self) {
+        // Use the library method
+        self.editor.exit_highlight_mode();
+        self.debug_message = "🔒 NORMAL MODE - Cursor: Steady Block █".to_string();
+    }
+
+    fn update_visual_selection(&mut self) {
+        if self.editor.is_highlight_mode() {
+            use canvas::canvas::state::SelectionState;
+            match self.editor.selection_state() {
+                SelectionState::Characterwise { anchor } => {
+                    self.debug_message = format!(
+                        "🎯 Visual selection: anchor=({},{}) current=({},{}) - Cursor: Blinking Block █",
+                        anchor.0, anchor.1,
+                        self.editor.current_field(),
+                        self.editor.cursor_position()
+                    );
+                }
+                SelectionState::Linewise { anchor_field } => {
+                    self.debug_message = format!(
+                        "🎯 Visual LINE selection: anchor={} current={} - Cursor: Blinking Block █",
+                        anchor_field,
+                        self.editor.current_field()
+                    );
+                }
+                _ => {}
+            }
+        }
+    }
+
+    // === ENHANCED MOVEMENT WITH VISUAL UPDATES ===
+
+    fn move_left(&mut self) {
+        self.editor.move_left();
+        self.update_visual_selection();
+    }
+
+    fn move_right(&mut self) {
+        self.editor.move_right();
+        self.update_visual_selection();
+    }
+
+    fn move_up(&mut self) {
+        self.editor.move_up();
+        self.update_visual_selection();
+    }
+
+    fn move_down(&mut self) {
+        self.editor.move_down();
+        self.update_visual_selection();
+    }
+
+    fn move_word_next(&mut self) {
+        self.editor.move_word_next();
+        self.update_visual_selection();
+    }
+
+    fn move_word_prev(&mut self) {
+        self.editor.move_word_prev();
+        self.update_visual_selection();
+    }
+
+    fn move_word_end(&mut self) {
+        self.editor.move_word_end();
+        self.update_visual_selection();
+    }
+
+    fn move_word_end_prev(&mut self) {
+        self.editor.move_word_end_prev();
+        self.update_visual_selection();
+    }
+
+    fn move_line_start(&mut self) {
+        self.editor.move_line_start();
+        self.update_visual_selection();
+    }
+
+    fn move_line_end(&mut self) {
+        self.editor.move_line_end();
+        self.update_visual_selection();
+    }
+
+    fn move_first_line(&mut self) {
+        self.editor.move_first_line();
+        self.update_visual_selection();
+    }
+
+    fn move_last_line(&mut self) {
+        self.editor.move_last_line();
+        self.update_visual_selection();
+    }
+
+    fn prev_field(&mut self) {
+        self.editor.prev_field();
+        self.update_visual_selection();
+    }
+
+    fn next_field(&mut self) {
+        self.editor.next_field();
+        self.update_visual_selection();
+    }
+
+    // === DELETE OPERATIONS ===
+
+    fn delete_backward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_backward();
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+            self.debug_message = "⌫ Deleted character backward".to_string();
+        }
+        Ok(result?)
+    }
+
+    fn delete_forward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_forward();
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+            self.debug_message = "⌦ Deleted character forward".to_string();
+        }
+        Ok(result?)
+    }
+
+    // === MODE TRANSITIONS WITH AUTOMATIC CURSOR MANAGEMENT ===
+
+    fn enter_edit_mode(&mut self) {
+        self.editor.enter_edit_mode(); // 🎯 Library automatically sets cursor to bar |
+        self.debug_message = "✏️  INSERT MODE - Cursor: Steady Bar |".to_string();
+    }
+
+    fn enter_append_mode(&mut self) {
+        self.editor.enter_append_mode(); // 🎯 Library automatically positions cursor and sets mode
+        self.debug_message = "✏️  INSERT (append) - Cursor: Steady Bar |".to_string();
+    }
+
+    fn exit_edit_mode(&mut self) {
+        self.editor.exit_edit_mode(); // 🎯 Library automatically sets cursor to block █
+        self.exit_visual_mode();
+        self.debug_message = "🔒 NORMAL MODE - Cursor: Steady Block █".to_string();
+    }
+
+    fn insert_char(&mut self, ch: char) -> anyhow::Result<()> {
+        let result = self.editor.insert_char(ch);
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+        }
+        Ok(result?)
+    }
+
+    // === MANUAL CURSOR OVERRIDE DEMONSTRATION ===
+    
+    /// Demonstrate manual cursor control (for advanced users)
+    fn demo_manual_cursor_control(&mut self) -> std::io::Result<()> {
+        // Users can still manually control cursor if needed
+        CursorManager::update_for_mode(AppMode::Command)?;
+        self.debug_message = "🔧 Manual override: Command cursor _".to_string();
+        Ok(())
+    }
+
+    fn restore_automatic_cursor(&mut self) -> std::io::Result<()> {
+        // Restore automatic cursor based on current mode
+        CursorManager::update_for_mode(self.editor.mode())?;
+        self.debug_message = "🎯 Restored automatic cursor management".to_string();
+        Ok(())
+    }
+
+    // === DELEGATE TO ORIGINAL EDITOR ===
+
+    fn current_field(&self) -> usize {
+        self.editor.current_field()
+    }
+
+    fn cursor_position(&self) -> usize {
+        self.editor.cursor_position()
+    }
+
+    fn mode(&self) -> AppMode {
+        self.editor.mode()
+    }
+
+    fn current_text(&self) -> &str {
+        self.editor.current_text()
+    }
+
+    fn data_provider(&self) -> &D {
+        self.editor.data_provider()
+    }
+
+    fn ui_state(&self) -> &canvas::EditorState {
+        self.editor.ui_state()
+    }
+
+    fn set_mode(&mut self, mode: AppMode) {
+        self.editor.set_mode(mode); // 🎯 Library automatically updates cursor
+        if mode != AppMode::Highlight {
+            self.exit_visual_mode();
+        }
+    }
+
+    // === STATUS AND DEBUG ===
+
+    fn set_debug_message(&mut self, msg: String) {
+        self.debug_message = msg;
+    }
+
+    fn debug_message(&self) -> &str {
+        &self.debug_message
+    }
+
+    fn has_unsaved_changes(&self) -> bool {
+        self.has_unsaved_changes
+    }
+}
+
+// Demo form data with interesting text for cursor demonstration
+struct CursorDemoData {
+    fields: Vec<(String, String)>,
+}
+
+impl CursorDemoData {
+    fn new() -> Self {
+        Self {
+            fields: vec![
+                ("👤 Name".to_string(), "John-Paul McDonald".to_string()),
+                ("📧 Email".to_string(), "user@example-domain.com".to_string()),
+                ("📱 Phone".to_string(), "+1 (555) 123-4567".to_string()),
+                ("🏠 Address".to_string(), "123 Main St, Apt 4B".to_string()),
+                ("🏷️  Tags".to_string(), "urgent,important,follow-up".to_string()),
+                ("📝 Notes".to_string(), "Watch the cursor change! Normal=█ Insert=| Visual=blinking█".to_string()),
+                ("🎯 Cursor Demo".to_string(), "Press 'i' for insert, 'v' for visual, 'Esc' for normal".to_string()),
+            ],
+        }
+    }
+}
+
+impl DataProvider for CursorDemoData {
+    fn field_count(&self) -> usize {
+        self.fields.len()
+    }
+
+    fn field_name(&self, index: usize) -> &str {
+        &self.fields[index].0
+    }
+
+    fn field_value(&self, index: usize) -> &str {
+        &self.fields[index].1
+    }
+
+    fn set_field_value(&mut self, index: usize, value: String) {
+        self.fields[index].1 = value;
+    }
+
+    fn supports_autocomplete(&self, _field_index: usize) -> bool {
+        false
+    }
+
+    fn display_value(&self, _index: usize) -> Option<&str> {
+        None
+    }
+}
+
+/// Automatic cursor management demonstration
+/// Features the CursorManager directly to show it's working
+fn handle_key_press(
+    key: KeyCode,
+    modifiers: KeyModifiers,
+    editor: &mut AutoCursorFormEditor<CursorDemoData>,
+) -> anyhow::Result<bool> {
+    let mode = editor.mode();
+
+    // Quit handling
+    if (key == KeyCode::Char('q') && modifiers.contains(KeyModifiers::CONTROL))
+        || (key == KeyCode::Char('c') && modifiers.contains(KeyModifiers::CONTROL))
+        || key == KeyCode::F(10)
+    {
+        return Ok(false);
+    }
+
+    match (mode, key, modifiers) {
+        // === MODE TRANSITIONS WITH AUTOMATIC CURSOR MANAGEMENT ===
+        (AppMode::ReadOnly, KeyCode::Char('i'), _) => {
+            editor.enter_edit_mode(); // 🎯 Automatic: cursor becomes bar |
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('a'), _) => {
+            editor.enter_append_mode();
+            editor.set_debug_message("✏️  INSERT (append) - Cursor: Steady Bar |".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('A'), _) => {
+            editor.move_line_end();
+            editor.enter_edit_mode(); // 🎯 Automatic: cursor becomes bar |
+            editor.set_debug_message("✏️  INSERT (end of line) - Cursor: Steady Bar |".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('o'), _) => {
+            editor.move_line_end();
+            editor.enter_edit_mode(); // 🎯 Automatic: cursor becomes bar |
+            editor.set_debug_message("✏️  INSERT (open line) - Cursor: Steady Bar |".to_string());
+            editor.clear_command_buffer();
+        }
+
+        // From Normal Mode: Enter visual modes
+        (AppMode::ReadOnly, KeyCode::Char('v'), _) => {
+            editor.enter_visual_mode();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('V'), _) => {
+            editor.enter_visual_line_mode();
+            editor.clear_command_buffer();
+        }
+        
+        // From Visual Mode: Switch between visual modes or exit
+        (AppMode::Highlight, KeyCode::Char('v'), _) => {
+            use canvas::canvas::state::SelectionState;
+            match editor.editor.selection_state() {
+                SelectionState::Characterwise { .. } => {
+                    // Already in characterwise mode, exit visual mode (vim behavior)
+                    editor.exit_visual_mode();
+                    editor.set_debug_message("🔒 Exited visual mode".to_string());
+                }
+                _ => {
+                    // Switch from linewise to characterwise mode
+                    editor.editor.enter_highlight_mode();
+                    editor.update_visual_selection();
+                    editor.set_debug_message("🔥 Switched to VISUAL mode".to_string());
+                }
+            }
+            editor.clear_command_buffer();
+        }
+        
+        (AppMode::Highlight, KeyCode::Char('V'), _) => {
+            use canvas::canvas::state::SelectionState;
+            match editor.editor.selection_state() {
+                SelectionState::Linewise { .. } => {
+                    // Already in linewise mode, exit visual mode (vim behavior)
+                    editor.exit_visual_mode();
+                    editor.set_debug_message("🔒 Exited visual mode".to_string());
+                }
+                _ => {
+                    // Switch from characterwise to linewise mode
+                    editor.editor.enter_highlight_line_mode();
+                    editor.update_visual_selection();
+                    editor.set_debug_message("🔥 Switched to VISUAL LINE mode".to_string());
+                }
+            }
+            editor.clear_command_buffer();
+        }
+        
+        // Escape: Exit any mode back to normal
+        (_, KeyCode::Esc, _) => {
+            match mode {
+                AppMode::Edit => {
+                    editor.exit_edit_mode(); // Exit insert mode
+                }
+                AppMode::Highlight => {
+                    editor.exit_visual_mode(); // Exit visual mode
+                }
+                _ => {
+                    // Already in normal mode, just clear command buffer
+                    editor.clear_command_buffer();
+                }
+            }
+        }
+
+        // === CURSOR MANAGEMENT DEMONSTRATION ===
+        (AppMode::ReadOnly, KeyCode::F(1), _) => {
+            editor.demo_manual_cursor_control()?;
+        }
+        (AppMode::ReadOnly, KeyCode::F(2), _) => {
+            editor.restore_automatic_cursor()?;
+        }
+
+        // === MOVEMENT: VIM-STYLE NAVIGATION ===
+
+        // Basic movement (hjkl and arrows)
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('h'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Left, _) => {
+            editor.move_left();
+            editor.set_debug_message("← left".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('l'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Right, _) => {
+            editor.move_right();
+            editor.set_debug_message("→ right".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('j'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Down, _) => {
+            editor.move_down();
+            editor.set_debug_message("↓ next field".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('k'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Up, _) => {
+            editor.move_up();
+            editor.set_debug_message("↑ previous field".to_string());
+            editor.clear_command_buffer();
+        }
+
+        // Word movement
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('w'), _) => {
+            editor.move_word_next();
+            editor.set_debug_message("w: next word start".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('b'), _) => {
+            editor.move_word_prev();
+            editor.set_debug_message("b: previous word start".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('e'), _) => {
+            editor.move_word_end();
+            editor.set_debug_message("e: word end".to_string());
+            editor.clear_command_buffer();
+        }
+
+        // Line movement
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('0'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Home, _) => {
+            editor.move_line_start();
+            editor.set_debug_message("0: line start".to_string());
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('$'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::End, _) => {
+            editor.move_line_end();
+            editor.set_debug_message("$: line end".to_string());
+        }
+
+        // Field/document movement
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('g'), _) => {
+            if editor.get_command_buffer() == "g" {
+                editor.move_first_line();
+                editor.set_debug_message("gg: first field".to_string());
+                editor.clear_command_buffer();
+            } else {
+                editor.clear_command_buffer();
+                editor.add_to_command_buffer('g');
+                editor.set_debug_message("g".to_string());
+            }
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('G'), _) => {
+            editor.move_last_line();
+            editor.set_debug_message("G: last field".to_string());
+            editor.clear_command_buffer();
+        }
+
+        // === EDIT MODE MOVEMENT ===
+        (AppMode::Edit, KeyCode::Left, m) if m.contains(KeyModifiers::CONTROL) => {
+            editor.move_word_prev();
+            editor.set_debug_message("Ctrl+← word back".to_string());
+        }
+        (AppMode::Edit, KeyCode::Right, m) if m.contains(KeyModifiers::CONTROL) => {
+            editor.move_word_next();
+            editor.set_debug_message("Ctrl+→ word forward".to_string());
+        }
+        (AppMode::Edit, KeyCode::Left, _) => {
+            editor.move_left();
+        }
+        (AppMode::Edit, KeyCode::Right, _) => {
+            editor.move_right();
+        }
+        (AppMode::Edit, KeyCode::Up, _) => {
+            editor.move_up();
+        }
+        (AppMode::Edit, KeyCode::Down, _) => {
+            editor.move_down();
+        }
+        (AppMode::Edit, KeyCode::Home, _) => {
+            editor.move_line_start();
+        }
+        (AppMode::Edit, KeyCode::End, _) => {
+            editor.move_line_end();
+        }
+
+        // === DELETE OPERATIONS ===
+        (AppMode::Edit, KeyCode::Backspace, _) => {
+            editor.delete_backward()?;
+        }
+        (AppMode::Edit, KeyCode::Delete, _) => {
+            editor.delete_forward()?;
+        }
+
+        // Delete operations in normal mode (vim x)
+        (AppMode::ReadOnly, KeyCode::Char('x'), _) => {
+            editor.delete_forward()?;
+            editor.set_debug_message("x: deleted character".to_string());
+        }
+        (AppMode::ReadOnly, KeyCode::Char('X'), _) => {
+            editor.delete_backward()?;
+            editor.set_debug_message("X: deleted character backward".to_string());
+        }
+
+        // === TAB NAVIGATION ===
+        (_, KeyCode::Tab, _) => {
+            editor.next_field();
+            editor.set_debug_message("Tab: next field".to_string());
+        }
+        (_, KeyCode::BackTab, _) => {
+            editor.prev_field();
+            editor.set_debug_message("Shift+Tab: previous field".to_string());
+        }
+
+        // === CHARACTER INPUT ===
+        (AppMode::Edit, KeyCode::Char(c), m) if !m.contains(KeyModifiers::CONTROL) => {
+            editor.insert_char(c)?;
+        }
+
+        // === DEBUG/INFO COMMANDS ===
+        (AppMode::ReadOnly, KeyCode::Char('?'), _) => {
+            editor.set_debug_message(format!(
+                "Field {}/{}, Pos {}, Mode: {:?} - Cursor managed automatically!",
+                editor.current_field() + 1,
+                editor.data_provider().field_count(),
+                editor.cursor_position(),
+                editor.mode()
+            ));
+        }
+
+        _ => {
+            if editor.has_pending_command() {
+                editor.clear_command_buffer();
+                editor.set_debug_message("Invalid command sequence".to_string());
+            } else {
+                editor.set_debug_message(format!(
+                    "Unhandled: {:?} + {:?} in {:?} mode",
+                    key, modifiers, mode
+                ));
+            }
+        }
+    }
+
+    Ok(true)
+}
+
+fn run_app<B: Backend>(
+    terminal: &mut Terminal<B>,
+    mut editor: AutoCursorFormEditor<CursorDemoData>,
+) -> io::Result<()> {
+    loop {
+        terminal.draw(|f| ui(f, &editor))?;
+
+        if let Event::Key(key) = event::read()? {
+            match handle_key_press(key.code, key.modifiers, &mut editor) {
+                Ok(should_continue) => {
+                    if !should_continue {
+                        break;
+                    }
+                }
+                Err(e) => {
+                    editor.set_debug_message(format!("Error: {}", e));
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn ui(f: &mut Frame, editor: &AutoCursorFormEditor<CursorDemoData>) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Constraint::Min(8), Constraint::Length(10)])
+        .split(f.area());
+
+    render_enhanced_canvas(f, chunks[0], editor);
+    render_status_and_help(f, chunks[1], editor);
+}
+
+fn render_enhanced_canvas(
+    f: &mut Frame,
+    area: ratatui::layout::Rect,
+    editor: &AutoCursorFormEditor<CursorDemoData>,
+) {
+    render_canvas_default(f, area, &editor.editor);
+}
+
+fn render_status_and_help(
+    f: &mut Frame,
+    area: ratatui::layout::Rect,
+    editor: &AutoCursorFormEditor<CursorDemoData>,
+) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Constraint::Length(3), Constraint::Length(7)])
+        .split(area);
+
+    // Status bar with cursor information - FIXED VERSION
+    let mode_text = match editor.mode() {
+        AppMode::Edit => "INSERT | (bar cursor)",
+        AppMode::ReadOnly => "NORMAL █ (block cursor)",
+        AppMode::Highlight => {
+            // Use library selection state instead of editor.highlight_state()
+            use canvas::canvas::state::SelectionState;
+            match editor.editor.selection_state() {
+                SelectionState::Characterwise { .. } => "VISUAL █ (blinking block)",
+                SelectionState::Linewise { .. } => "VISUAL LINE █ (blinking block)",
+                _ => "VISUAL █ (blinking block)",
+            }
+        },
+        _ => "NORMAL █ (block cursor)",
+    };
+
+    let status_text = if editor.has_pending_command() {
+        format!("-- {} -- {} [{}]", mode_text, editor.debug_message(), editor.get_command_buffer())
+    } else if editor.has_unsaved_changes() {
+        format!("-- {} -- [Modified] {}", mode_text, editor.debug_message())
+    } else {
+        format!("-- {} -- {}", mode_text, editor.debug_message())
+    };
+
+    let status = Paragraph::new(Line::from(Span::raw(status_text)))
+        .block(Block::default().borders(Borders::ALL).title("🎯 Automatic Cursor Status"));
+
+    f.render_widget(status, chunks[0]);
+
+    // Enhanced help text (no changes needed here)
+    let help_text = match editor.mode() {
+        AppMode::ReadOnly => {
+            if editor.has_pending_command() {
+                match editor.get_command_buffer() {
+                    "g" => "Press 'g' again for first field, or any other key to cancel",
+                    _ => "Pending command... (Esc to cancel)"
+                }
+            } else {
+                "🎯 CURSOR-STYLE DEMO: Normal █ | Insert | | Visual blinking█\n\
+                 Normal: hjkl/arrows=move, w/b/e=words, 0/$=line, gg/G=first/last\n\
+                 i/a/A=insert, v/b=visual, x/X=delete, ?=info\n\
+                 F1=demo manual cursor, F2=restore automatic"
+            }
+        }
+        AppMode::Edit => {
+            "🎯 INSERT MODE - Cursor: | (bar)\n\
+             arrows=move, Ctrl+arrows=words, Backspace/Del=delete\n\
+             Esc=normal, Tab/Shift+Tab=fields"
+        }
+        AppMode::Highlight => {
+            "🎯 VISUAL MODE - Cursor: █ (blinking block)\n\
+             hjkl/arrows=extend selection, w/b/e=word selection\n\
+             Esc=normal"
+        }
+        _ => "🎯 Watch the cursor change automatically!"
+    };
+
+    let help = Paragraph::new(help_text)
+        .block(Block::default().borders(Borders::ALL).title("🚀 Automatic Cursor Management"))
+        .style(Style::default().fg(Color::Gray));
+
+    f.render_widget(help, chunks[1]);
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Print feature status
+    println!("🎯 Canvas Cursor Auto Demo");
+    println!("✅ cursor-style feature: ENABLED");
+    println!("🚀 Automatic cursor management: ACTIVE");
+    println!("📖 Watch your terminal cursor change based on mode!");
+    println!();
+
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    let data = CursorDemoData::new();
+    let mut editor = AutoCursorFormEditor::new(data);
+    
+    // Initialize with normal mode - library automatically sets block cursor
+    editor.set_mode(AppMode::ReadOnly);
+
+    // Demonstrate that CursorManager is available and working
+    CursorManager::update_for_mode(AppMode::ReadOnly)?;
+
+    let res = run_app(&mut terminal, editor);
+
+    // Library automatically resets cursor on FormEditor::drop()
+    // But we can also manually reset if needed
+    CursorManager::reset()?;
+
+    disable_raw_mode()?;
+    execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    terminal.show_cursor()?;
+
+    if let Err(err) = res {
+        println!("{:?}", err);
+    }
+
+    println!("🎯 Cursor automatically reset to default!");
+    Ok(())
+}

canvas/examples/canvas_gui_demo.rs

@@ -1,367 +0,0 @@
-use std::io;
-use crossterm::{
-    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyModifiers},
-    execute,
-    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
-};
-use ratatui::{
-    backend::{Backend, CrosstermBackend},
-    layout::{Constraint, Direction, Layout},
-    style::{Color, Style},
-    text::{Line, Span},
-    widgets::{Block, Borders, Paragraph},
-    Frame, Terminal,
-};
-
-use canvas::{
-    canvas::{
-        gui::render_canvas,
-        modes::{AppMode, HighlightState, ModeManager},
-        state::{ActionContext, CanvasState},
-        theme::CanvasTheme,
-    },
-    config::CanvasConfig,
-    dispatcher::ActionDispatcher,
-    CanvasAction,
-};
-
-// Simple theme implementation
-#[derive(Clone)]
-struct DemoTheme;
-
-impl CanvasTheme for DemoTheme {
-    fn bg(&self) -> Color { Color::Reset }
-    fn fg(&self) -> Color { Color::White }
-    fn accent(&self) -> Color { Color::Cyan }
-    fn secondary(&self) -> Color { Color::Gray }
-    fn highlight(&self) -> Color { Color::Yellow }
-    fn highlight_bg(&self) -> Color { Color::DarkGray }
-    fn warning(&self) -> Color { Color::Red }
-    fn border(&self) -> Color { Color::Gray }
-}
-
-// Demo form state
-struct DemoFormState {
-    fields: Vec<String>,
-    field_names: Vec<String>,
-    current_field: usize,
-    cursor_pos: usize,
-    mode: AppMode,
-    highlight_state: HighlightState,
-    has_changes: bool,
-    ideal_cursor_column: usize,
-    last_action: Option<String>,
-    debug_message: String,
-}
-
-impl DemoFormState {
-    fn new() -> Self {
-        Self {
-            fields: vec![
-                "John Doe".to_string(),
-                "john.doe@example.com".to_string(),
-                "+1 234 567 8900".to_string(),
-                "123 Main Street Apt 4B".to_string(),
-                "San Francisco".to_string(),
-                "This is a test comment with multiple words".to_string(),
-            ],
-            field_names: vec![
-                "Name".to_string(),
-                "Email".to_string(),
-                "Phone".to_string(),
-                "Address".to_string(),
-                "City".to_string(),
-                "Comments".to_string(),
-            ],
-            current_field: 0,
-            cursor_pos: 0,
-            mode: AppMode::ReadOnly,
-            highlight_state: HighlightState::Off,
-            has_changes: false,
-            ideal_cursor_column: 0,
-            last_action: None,
-            debug_message: "Ready".to_string(),
-        }
-    }
-
-    fn enter_edit_mode(&mut self) {
-        if ModeManager::can_enter_edit_mode(self.mode) {
-            self.mode = AppMode::Edit;
-            self.debug_message = "Entered EDIT mode".to_string();
-        }
-    }
-
-    fn enter_readonly_mode(&mut self) {
-        if ModeManager::can_enter_read_only_mode(self.mode) {
-            self.mode = AppMode::ReadOnly;
-            self.highlight_state = HighlightState::Off;
-            self.debug_message = "Entered READ-ONLY mode".to_string();
-        }
-    }
-
-    fn enter_highlight_mode(&mut self) {
-        if ModeManager::can_enter_highlight_mode(self.mode) {
-            self.mode = AppMode::Highlight;
-            self.highlight_state = HighlightState::Characterwise {
-                anchor: (self.current_field, self.cursor_pos),
-            };
-            self.debug_message = "Entered VISUAL mode".to_string();
-        }
-    }
-}
-
-impl CanvasState for DemoFormState {
-    fn current_field(&self) -> usize {
-        self.current_field
-    }
-
-    fn current_cursor_pos(&self) -> usize {
-        self.cursor_pos
-    }
-
-    fn set_current_field(&mut self, index: usize) {
-        self.current_field = index.min(self.fields.len().saturating_sub(1));
-        self.cursor_pos = self.fields[self.current_field].len();
-    }
-
-    fn set_current_cursor_pos(&mut self, pos: usize) {
-        let max_pos = self.fields[self.current_field].len();
-        self.cursor_pos = pos.min(max_pos);
-    }
-
-    fn current_mode(&self) -> AppMode {
-        self.mode
-    }
-
-    fn get_current_input(&self) -> &str {
-        &self.fields[self.current_field]
-    }
-
-    fn get_current_input_mut(&mut self) -> &mut String {
-        &mut self.fields[self.current_field]
-    }
-
-    fn inputs(&self) -> Vec<&String> {
-        self.fields.iter().collect()
-    }
-
-    fn fields(&self) -> Vec<&str> {
-        self.field_names.iter().map(|s| s.as_str()).collect()
-    }
-
-    fn has_unsaved_changes(&self) -> bool {
-        self.has_changes
-    }
-
-    fn set_has_unsaved_changes(&mut self, changed: bool) {
-        self.has_changes = changed;
-    }
-
-    fn handle_feature_action(&mut self, action: &CanvasAction, _context: &ActionContext) -> Option<String> {
-        match action {
-            CanvasAction::Custom(cmd) => {
-                match cmd.as_str() {
-                    "enter_edit_mode" => {
-                        self.enter_edit_mode();
-                        Some("Entered edit mode".to_string())
-                    }
-                    "enter_readonly_mode" => {
-                        self.enter_readonly_mode();
-                        Some("Entered read-only mode".to_string())
-                    }
-                    "enter_highlight_mode" => {
-                        self.enter_highlight_mode();
-                        Some("Entered highlight mode".to_string())
-                    }
-                    _ => None,
-                }
-            }
-            _ => None,
-        }
-    }
-}
-
-async fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut state: DemoFormState, config: CanvasConfig) -> io::Result<()> {
-    let theme = DemoTheme;
-
-    loop {
-        terminal.draw(|f| ui(f, &state, &theme))?;
-
-        if let Event::Key(key) = event::read()? {
-            // Handle quit
-            if (key.code == KeyCode::Char('q') && key.modifiers.contains(KeyModifiers::CONTROL)) ||
-               (key.code == KeyCode::Char('c') && key.modifiers.contains(KeyModifiers::CONTROL)) ||
-               key.code == KeyCode::F(10) {
-                break;
-            }
-
-            let is_edit_mode = state.mode == AppMode::Edit;
-            let mut handled = false;
-
-            // First priority: Try to dispatch through config system
-            let mut ideal_cursor = state.ideal_cursor_column;
-
-            if let Ok(Some(result)) = ActionDispatcher::dispatch_key(
-                key.code,
-                key.modifiers,
-                &mut state,
-                &mut ideal_cursor,
-                is_edit_mode,
-                false,
-            ).await {
-                state.ideal_cursor_column = ideal_cursor;
-                state.debug_message = format!("Config handled: {:?}", key.code);
-
-                // Mark as changed for text modification keys in edit mode
-                if is_edit_mode {
-                    match key.code {
-                        KeyCode::Char(_) | KeyCode::Backspace | KeyCode::Delete => {
-                            state.set_has_unsaved_changes(true);
-                        }
-                        _ => {}
-                    }
-                }
-                handled = true;
-            }
-
-            // Second priority: Handle character input in edit mode
-            if !handled && is_edit_mode {
-                if let KeyCode::Char(c) = key.code {
-                    if !key.modifiers.contains(KeyModifiers::CONTROL) && !key.modifiers.contains(KeyModifiers::ALT) {
-                        let action = CanvasAction::InsertChar(c);
-                        let mut ideal_cursor = state.ideal_cursor_column;
-                        if let Ok(_) = ActionDispatcher::dispatch_with_config(
-                            action,
-                            &mut state,
-                            &mut ideal_cursor,
-                            Some(&config),
-                        ).await {
-                            state.ideal_cursor_column = ideal_cursor;
-                            state.set_has_unsaved_changes(true);
-                            state.debug_message = format!("Inserted char: '{}'", c);
-                            handled = true;
-                        }
-                    }
-                }
-            }
-
-            // Third priority: Fallback mode transitions
-            if !handled {
-                match (state.mode, key.code) {
-                    (AppMode::ReadOnly, KeyCode::Char('i') | KeyCode::Char('a') | KeyCode::Insert) => {
-                        state.enter_edit_mode();
-                        if key.code == KeyCode::Char('a') {
-                            state.cursor_pos = state.fields[state.current_field].len();
-                        }
-                        state.debug_message = format!("Entered edit mode via {:?}", key.code);
-                        handled = true;
-                    }
-                    (AppMode::ReadOnly, KeyCode::Char('v')) => {
-                        state.enter_highlight_mode();
-                        state.debug_message = "Entered visual mode".to_string();
-                        handled = true;
-                    }
-                    (_, KeyCode::Esc) => {
-                        state.enter_readonly_mode();
-                        state.debug_message = "Entered read-only mode".to_string();
-                        handled = true;
-                    }
-                    _ => {}
-                }
-            }
-
-            if !handled {
-                state.debug_message = format!("Unhandled key: {:?}", key.code);
-            }
-        }
-    }
-
-    Ok(())
-}
-
-fn ui(f: &mut Frame, state: &DemoFormState, theme: &DemoTheme) {
-    let chunks = Layout::default()
-        .direction(Direction::Vertical)
-        .constraints([
-            Constraint::Min(8),
-            Constraint::Length(4),
-        ])
-        .split(f.area());
-
-    // Render the canvas form
-    render_canvas(
-        f,
-        chunks[0],
-        state,
-        theme,
-        state.mode == AppMode::Edit,
-        &state.highlight_state,
-    );
-
-    // Render status bar
-    let mode_text = match state.mode {
-        AppMode::Edit => "EDIT",
-        AppMode::ReadOnly => "NORMAL",
-        AppMode::Highlight => "VISUAL",
-        AppMode::General => "GENERAL",
-        AppMode::Command => "COMMAND",
-    };
-
-    let status_text = if state.has_changes {
-        format!("-- {} -- [Modified]", mode_text)
-    } else {
-        format!("-- {} --", mode_text)
-    };
-
-    let position_text = format!("Field: {}/{} | Cursor: {} | Column: {}",
-        state.current_field + 1,
-        state.fields.len(),
-        state.cursor_pos,
-        state.ideal_cursor_column);
-
-    let help_text = match state.mode {
-        AppMode::ReadOnly => "hjkl/arrows: Move | Tab/Shift+Tab: Fields | w/b/e: Words | 0/$: Line | gg/G: File | i/a: Edit | v: Visual | F10: Quit",
-        AppMode::Edit => "Type to edit | hjkl/arrows: Move | Tab/Enter: Next field | Backspace/Delete: Delete | Home/End: Line | Esc: Normal | F10: Quit",
-        AppMode::Highlight => "hjkl/arrows: Select | w/b/e: Words | 0/$: Line | Esc: Normal | F10: Quit",
-        _ => "Esc: Normal | F10: Quit",
-    };
-
-    let status = Paragraph::new(vec![
-        Line::from(Span::styled(status_text, Style::default().fg(theme.accent()))),
-        Line::from(Span::styled(position_text, Style::default().fg(theme.fg()))),
-        Line::from(Span::styled(state.debug_message.clone(), Style::default().fg(theme.warning()))),
-        Line::from(Span::styled(help_text, Style::default().fg(theme.secondary()))),
-    ])
-    .block(Block::default().borders(Borders::ALL).title("Status"));
-
-    f.render_widget(status, chunks[1]);
-}
-
-#[tokio::main]
-async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let config = CanvasConfig::load();
-
-    enable_raw_mode()?;
-    let mut stdout = io::stdout();
-    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
-    let backend = CrosstermBackend::new(stdout);
-    let mut terminal = Terminal::new(backend)?;
-
-    let state = DemoFormState::new();
-
-    let res = run_app(&mut terminal, state, config).await;
-
-    disable_raw_mode()?;
-    execute!(
-        terminal.backend_mut(),
-        LeaveAlternateScreen,
-        DisableMouseCapture
-    )?;
-    terminal.show_cursor()?;
-
-    if let Err(err) = res {
-        println!("{:?}", err);
-    }
-
-    Ok(())
-}

canvas/examples/full_canvas_demo.rs

@@ -0,0 +1,724 @@
+// examples/full_canvas_demo.rs
+//! Demonstrates the FULL potential of the canvas library using the native API
+
+use std::io;
+use crossterm::{
+    cursor::SetCursorStyle,
+    event::{
+        self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyModifiers,
+    },
+    execute,
+    terminal::{
+        disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
+    },
+};
+use ratatui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout},
+    style::{Color, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph},
+    Frame, Terminal,
+};
+
+use canvas::{
+    canvas::{
+        gui::render_canvas_default,
+        modes::{AppMode, ModeManager, HighlightState},
+    },
+    DataProvider, FormEditor,
+};
+
+/// Update cursor style based on current AppMode
+fn update_cursor_for_mode(mode: AppMode) -> io::Result<()> {
+    let style = match mode {
+        AppMode::Edit => SetCursorStyle::SteadyBar,           // Thin line for insert mode
+        AppMode::ReadOnly => SetCursorStyle::SteadyBlock,     // Block for normal mode  
+        AppMode::Highlight => SetCursorStyle::BlinkingBlock,  // Blinking block for visual mode
+        AppMode::General => SetCursorStyle::SteadyBlock,      // Block for general mode
+        AppMode::Command => SetCursorStyle::SteadyUnderScore, // Underscore for command mode
+    };
+    
+    execute!(io::stdout(), style)
+}
+
+// Enhanced FormEditor that adds visual mode and status tracking
+struct EnhancedFormEditor<D: DataProvider> {
+    editor: FormEditor<D>,
+    highlight_state: HighlightState,
+    has_unsaved_changes: bool,
+    debug_message: String,
+    command_buffer: String, // For multi-key vim commands like "gg"
+}
+
+impl<D: DataProvider> EnhancedFormEditor<D> {
+    fn new(data_provider: D) -> Self {
+        Self {
+            editor: FormEditor::new(data_provider),
+            highlight_state: HighlightState::Off,
+            has_unsaved_changes: false,
+            debug_message: "Full Canvas Demo - All features enabled".to_string(),
+            command_buffer: String::new(),
+        }
+    }
+
+    // === COMMAND BUFFER HANDLING ===
+
+    fn clear_command_buffer(&mut self) {
+        self.command_buffer.clear();
+    }
+
+    fn add_to_command_buffer(&mut self, ch: char) {
+        self.command_buffer.push(ch);
+    }
+
+    fn get_command_buffer(&self) -> &str {
+        &self.command_buffer
+    }
+
+    fn has_pending_command(&self) -> bool {
+        !self.command_buffer.is_empty()
+    }
+
+    // === VISUAL/HIGHLIGHT MODE SUPPORT ===
+
+    fn enter_visual_mode(&mut self) {
+        if ModeManager::can_enter_highlight_mode(self.editor.mode()) {
+            self.editor.set_mode(AppMode::Highlight);
+            self.highlight_state = HighlightState::Characterwise {
+                anchor: (
+                    self.editor.current_field(),
+                    self.editor.cursor_position(),
+                ),
+            };
+            self.debug_message = "-- VISUAL --".to_string();
+        }
+    }
+
+    fn enter_visual_line_mode(&mut self) {
+        if ModeManager::can_enter_highlight_mode(self.editor.mode()) {
+            self.editor.set_mode(AppMode::Highlight);
+            self.highlight_state =
+                HighlightState::Linewise { anchor_line: self.editor.current_field() };
+            self.debug_message = "-- VISUAL LINE --".to_string();
+        }
+    }
+
+    fn exit_visual_mode(&mut self) {
+        self.highlight_state = HighlightState::Off;
+        if self.editor.mode() == AppMode::Highlight {
+            self.editor.set_mode(AppMode::ReadOnly);
+            self.debug_message = "Visual mode exited".to_string();
+        }
+    }
+
+    fn update_visual_selection(&mut self) {
+        if self.editor.mode() == AppMode::Highlight {
+            match &self.highlight_state {
+                HighlightState::Characterwise { anchor: _ } => {
+                    self.debug_message = format!(
+                        "Visual selection: char {} in field {}",
+                        self.editor.cursor_position(),
+                        self.editor.current_field()
+                    );
+                }
+                HighlightState::Linewise { anchor_line: _ } => {
+                    self.debug_message = format!(
+                        "Visual line selection: field {}",
+                        self.editor.current_field()
+                    );
+                }
+                _ => {}
+            }
+        }
+    }
+
+    // === ENHANCED MOVEMENT WITH VISUAL UPDATES ===
+
+    fn move_left(&mut self) {
+        self.editor.move_left();
+        self.update_visual_selection();
+    }
+
+    fn move_right(&mut self) {
+        self.editor.move_right();
+        self.update_visual_selection();
+    }
+
+    fn move_up(&mut self) {
+        self.editor.move_up();
+        self.update_visual_selection();
+    }
+
+    fn move_down(&mut self) {
+        self.editor.move_down();
+        self.update_visual_selection();
+    }
+
+    fn move_word_next(&mut self) {
+        self.editor.move_word_next();
+        self.update_visual_selection();
+    }
+
+    fn move_word_prev(&mut self) {
+        self.editor.move_word_prev();
+        self.update_visual_selection();
+    }
+
+    fn move_word_end(&mut self) {
+        self.editor.move_word_end();
+        self.update_visual_selection();
+    }
+
+    fn move_word_end_prev(&mut self) {
+        self.editor.move_word_end_prev();
+        self.update_visual_selection();
+    }
+
+    fn move_line_start(&mut self) {
+        self.editor.move_line_start();
+        self.update_visual_selection();
+    }
+
+    fn move_line_end(&mut self) {
+        self.editor.move_line_end();
+        self.update_visual_selection();
+    }
+
+    fn move_first_line(&mut self) {
+        self.editor.move_first_line();
+        self.update_visual_selection();
+    }
+
+    fn move_last_line(&mut self) {
+        self.editor.move_last_line();
+        self.update_visual_selection();
+    }
+
+    fn prev_field(&mut self) {
+        self.editor.prev_field();
+        self.update_visual_selection();
+    }
+
+    fn next_field(&mut self) {
+        self.editor.next_field();
+        self.update_visual_selection();
+    }
+
+    // === DELETE OPERATIONS ===
+
+    fn delete_backward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_backward();
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+            self.debug_message = "Deleted character backward".to_string();
+        }
+        Ok(result?)
+    }
+
+    fn delete_forward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_forward();
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+            self.debug_message = "Deleted character forward".to_string();
+        }
+        Ok(result?)
+    }
+
+    // === MODE TRANSITIONS ===
+
+    fn enter_edit_mode(&mut self) {
+        self.editor.enter_edit_mode();
+        self.debug_message = "-- INSERT --".to_string();
+    }
+
+    fn exit_edit_mode(&mut self) {
+        self.editor.exit_edit_mode();
+        self.exit_visual_mode();
+        self.debug_message = "".to_string();
+    }
+
+    fn insert_char(&mut self, ch: char) -> anyhow::Result<()> {
+        let result = self.editor.insert_char(ch);
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+        }
+        Ok(result?)
+    }
+
+    // === DELEGATE TO ORIGINAL EDITOR ===
+
+    fn current_field(&self) -> usize {
+        self.editor.current_field()
+    }
+
+    fn cursor_position(&self) -> usize {
+        self.editor.cursor_position()
+    }
+
+    fn mode(&self) -> AppMode {
+        self.editor.mode()
+    }
+
+    fn current_text(&self) -> &str {
+        self.editor.current_text()
+    }
+
+    fn data_provider(&self) -> &D {
+        self.editor.data_provider()
+    }
+
+    fn ui_state(&self) -> &canvas::EditorState {
+        self.editor.ui_state()
+    }
+
+    fn set_mode(&mut self, mode: AppMode) {
+        self.editor.set_mode(mode);
+        if mode != AppMode::Highlight {
+            self.exit_visual_mode();
+        }
+    }
+
+    // === STATUS AND DEBUG ===
+
+    fn set_debug_message(&mut self, msg: String) {
+        self.debug_message = msg;
+    }
+
+    fn debug_message(&self) -> &str {
+        &self.debug_message
+    }
+
+    fn highlight_state(&self) -> &HighlightState {
+        &self.highlight_state
+    }
+
+    fn has_unsaved_changes(&self) -> bool {
+        self.has_unsaved_changes
+    }
+}
+
+// Demo form data with interesting text for word movement
+struct FullDemoData {
+    fields: Vec<(String, String)>,
+}
+
+impl FullDemoData {
+    fn new() -> Self {
+        Self {
+            fields: vec![
+                ("Name".to_string(), "John-Paul McDonald".to_string()),
+                (
+                    "Email".to_string(),
+                    "user@example-domain.com".to_string(),
+                ),
+                ("Phone".to_string(), "+1 (555) 123-4567".to_string()),
+                ("Address".to_string(), "123 Main St, Apt 4B".to_string()),
+                (
+                    "Tags".to_string(),
+                    "urgent,important,follow-up".to_string(),
+                ),
+                (
+                    "Notes".to_string(),
+                    "This is a sample note with multiple words, punctuation! And symbols @#$"
+                        .to_string(),
+                ),
+            ],
+        }
+    }
+}
+
+impl DataProvider for FullDemoData {
+    fn field_count(&self) -> usize {
+        self.fields.len()
+    }
+
+    fn field_name(&self, index: usize) -> &str {
+        &self.fields[index].0
+    }
+
+    fn field_value(&self, index: usize) -> &str {
+        &self.fields[index].1
+    }
+
+    fn set_field_value(&mut self, index: usize, value: String) {
+        self.fields[index].1 = value;
+    }
+
+    fn supports_autocomplete(&self, _field_index: usize) -> bool {
+        false
+    }
+
+    fn display_value(&self, _index: usize) -> Option<&str> {
+        None
+    }
+}
+
+/// Full vim-like key handling using the native FormEditor API
+fn handle_key_press(
+    key: KeyCode,
+    modifiers: KeyModifiers,
+    editor: &mut EnhancedFormEditor<FullDemoData>,
+) -> anyhow::Result<bool> {
+    let old_mode = editor.mode(); // Store mode before processing
+
+    // Quit handling
+    if (key == KeyCode::Char('q') && modifiers.contains(KeyModifiers::CONTROL))
+        || (key == KeyCode::Char('c') && modifiers.contains(KeyModifiers::CONTROL))
+        || key == KeyCode::F(10)
+    {
+        return Ok(false);
+    }
+
+    match (old_mode, key, modifiers) {
+        // === MODE TRANSITIONS ===
+        (AppMode::ReadOnly, KeyCode::Char('i'), _) => {
+            editor.enter_edit_mode();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('a'), _) => {
+            editor.move_right(); // Move after current character
+            editor.enter_edit_mode();
+            editor.set_debug_message("-- INSERT -- (append)".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('A'), _) => {
+            editor.move_line_end();
+            editor.enter_edit_mode();
+            editor.set_debug_message("-- INSERT -- (end of line)".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('o'), _) => {
+            editor.move_line_end();
+            editor.enter_edit_mode();
+            editor.set_debug_message("-- INSERT -- (open line)".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('v'), _) => {
+            editor.enter_visual_mode();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('V'), _) => {
+            editor.enter_visual_line_mode();
+            editor.clear_command_buffer();
+        }
+        (_, KeyCode::Esc, _) => {
+            editor.exit_edit_mode();
+            editor.clear_command_buffer();
+        }
+
+        // === MOVEMENT: VIM-STYLE NAVIGATION ===
+
+        // Basic movement (hjkl and arrows)
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('h'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Left, _) => {
+            editor.move_left();
+            editor.set_debug_message("← left".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('l'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Right, _) => {
+            editor.move_right();
+            editor.set_debug_message("→ right".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('j'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Down, _) => {
+            editor.move_down();
+            editor.set_debug_message("↓ next field".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('k'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Up, _) => {
+            editor.move_up();
+            editor.set_debug_message("↑ previous field".to_string());
+            editor.clear_command_buffer();
+        }
+
+        // Word movement - Full vim word navigation
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('w'), _) => {
+            editor.move_word_next();
+            editor.set_debug_message("w: next word start".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('b'), _) => {
+            editor.move_word_prev();
+            editor.set_debug_message("b: previous word start".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('e'), _) => {
+            editor.move_word_end();
+            editor.set_debug_message("e: word end".to_string());
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('W'), _) => {
+            editor.move_word_end_prev();
+            editor.set_debug_message("W: previous word end".to_string());
+            editor.clear_command_buffer();
+        }
+
+        // Line movement
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('0'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Home, _) => {
+            editor.move_line_start();
+            editor.set_debug_message("0: line start".to_string());
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('$'), _)
+        | (AppMode::ReadOnly | AppMode::Highlight, KeyCode::End, _) => {
+            editor.move_line_end();
+            editor.set_debug_message("$: line end".to_string());
+        }
+
+        // Field/document movement
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('g'), _) => {
+            if editor.get_command_buffer() == "g" {
+                // Second 'g' - execute "gg" command
+                editor.move_first_line();
+                editor.set_debug_message("gg: first field".to_string());
+                editor.clear_command_buffer();
+            } else {
+                // First 'g' - start command buffer
+                editor.clear_command_buffer();
+                editor.add_to_command_buffer('g');
+                editor.set_debug_message("g".to_string());
+            }
+        }
+        (AppMode::ReadOnly | AppMode::Highlight, KeyCode::Char('G'), _) => {
+            editor.move_last_line();
+            editor.set_debug_message("G: last field".to_string());
+            editor.clear_command_buffer();
+        }
+
+        // === EDIT MODE MOVEMENT ===
+        (AppMode::Edit, KeyCode::Left, m) if m.contains(KeyModifiers::CONTROL) => {
+            editor.move_word_prev();
+            editor.set_debug_message("Ctrl+← word back".to_string());
+        }
+        (AppMode::Edit, KeyCode::Right, m) if m.contains(KeyModifiers::CONTROL) => {
+            editor.move_word_next();
+            editor.set_debug_message("Ctrl+→ word forward".to_string());
+        }
+        (AppMode::Edit, KeyCode::Left, _) => {
+            editor.move_left();
+        }
+        (AppMode::Edit, KeyCode::Right, _) => {
+            editor.move_right();
+        }
+        (AppMode::Edit, KeyCode::Up, _) => {
+            editor.move_up();
+        }
+        (AppMode::Edit, KeyCode::Down, _) => {
+            editor.move_down();
+        }
+        (AppMode::Edit, KeyCode::Home, _) => {
+            editor.move_line_start();
+        }
+        (AppMode::Edit, KeyCode::End, _) => {
+            editor.move_line_end();
+        }
+
+        // === DELETE OPERATIONS ===
+        (AppMode::Edit, KeyCode::Backspace, _) => {
+            editor.delete_backward()?;
+        }
+        (AppMode::Edit, KeyCode::Delete, _) => {
+            editor.delete_forward()?;
+        }
+
+        // Delete operations in normal mode (vim x)
+        (AppMode::ReadOnly, KeyCode::Char('x'), _) => {
+            editor.delete_forward()?;
+            editor.set_debug_message("x: deleted character".to_string());
+        }
+        (AppMode::ReadOnly, KeyCode::Char('X'), _) => {
+            editor.delete_backward()?;
+            editor.set_debug_message("X: deleted character backward".to_string());
+        }
+
+        // === TAB NAVIGATION ===
+        (_, KeyCode::Tab, _) => {
+            editor.next_field();
+            editor.set_debug_message("Tab: next field".to_string());
+        }
+        (_, KeyCode::BackTab, _) => {
+            editor.prev_field();
+            editor.set_debug_message("Shift+Tab: previous field".to_string());
+        }
+
+        // === CHARACTER INPUT ===
+        (AppMode::Edit, KeyCode::Char(c), m) if !m.contains(KeyModifiers::CONTROL) => {
+            editor.insert_char(c)?;
+        }
+
+        // === DEBUG/INFO COMMANDS ===
+        (AppMode::ReadOnly, KeyCode::Char('?'), _) => {
+            editor.set_debug_message(format!(
+                "Field {}/{}, Pos {}, Mode: {:?}",
+                editor.current_field() + 1,
+                editor.data_provider().field_count(),
+                editor.cursor_position(),
+                editor.mode()
+            ));
+        }
+
+        _ => {
+            // If we have a pending command and this key doesn't complete it, clear the buffer
+            if editor.has_pending_command() {
+                editor.clear_command_buffer();
+                editor.set_debug_message("Invalid command sequence".to_string());
+            } else {
+                editor.set_debug_message(format!(
+                    "Unhandled: {:?} + {:?} in {:?} mode",
+                    key, modifiers, old_mode
+                ));
+            }
+        }
+    }
+
+    // Update cursor if mode changed
+    let new_mode = editor.mode();
+    if old_mode != new_mode {
+        update_cursor_for_mode(new_mode)?;
+    }
+
+    Ok(true)
+}
+
+fn run_app<B: Backend>(
+    terminal: &mut Terminal<B>,
+    mut editor: EnhancedFormEditor<FullDemoData>,
+) -> io::Result<()> {
+    loop {
+        terminal.draw(|f| ui(f, &editor))?;
+
+        if let Event::Key(key) = event::read()? {
+            match handle_key_press(key.code, key.modifiers, &mut editor) {
+                Ok(should_continue) => {
+                    if !should_continue {
+                        break;
+                    }
+                }
+                Err(e) => {
+                    editor.set_debug_message(format!("Error: {}", e));
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn ui(f: &mut Frame, editor: &EnhancedFormEditor<FullDemoData>) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Constraint::Min(8), Constraint::Length(8)])
+        .split(f.area());
+
+    render_enhanced_canvas(f, chunks[0], editor);
+    render_status_and_help(f, chunks[1], editor);
+}
+
+fn render_enhanced_canvas(
+    f: &mut Frame,
+    area: ratatui::layout::Rect,
+    editor: &EnhancedFormEditor<FullDemoData>,
+) {
+    render_canvas_default(f, area, &editor.editor);
+}
+
+fn render_status_and_help(
+    f: &mut Frame,
+    area: ratatui::layout::Rect,
+    editor: &EnhancedFormEditor<FullDemoData>,
+) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Constraint::Length(3), Constraint::Length(5)])
+        .split(area);
+
+    // Status bar
+    let mode_text = match editor.mode() {
+        AppMode::Edit => "INSERT",
+        AppMode::ReadOnly => "NORMAL",
+        AppMode::Highlight => match editor.highlight_state() {
+            HighlightState::Characterwise { .. } => "VISUAL",
+            HighlightState::Linewise { .. } => "VISUAL LINE",
+            _ => "VISUAL",
+        },
+        _ => "NORMAL",
+    };
+
+    let status_text = if editor.has_pending_command() {
+        format!("-- {} -- {} [{}]", mode_text, editor.debug_message(), editor.get_command_buffer())
+    } else if editor.has_unsaved_changes() {
+        format!("-- {} -- [Modified] {}", mode_text, editor.debug_message())
+    } else {
+        format!("-- {} -- {}", mode_text, editor.debug_message())
+    };
+
+    let status = Paragraph::new(Line::from(Span::raw(status_text)))
+        .block(Block::default().borders(Borders::ALL).title("Status"));
+
+    f.render_widget(status, chunks[0]);
+
+    // Help text
+    let help_text = match editor.mode() {
+        AppMode::ReadOnly => {
+            if editor.has_pending_command() {
+                match editor.get_command_buffer() {
+                    "g" => "Press 'g' again for first field, or any other key to cancel",
+                    _ => "Pending command... (Esc to cancel)"
+                }
+            } else {
+                "Normal: hjkl/arrows=move, w/b/e=words, 0/$=line, gg/G=first/last, i/a/A=insert, v/V=visual, x/X=delete, ?=info"
+            }
+        }
+        AppMode::Edit => {
+            "Insert: arrows=move, Ctrl+arrows=words, Backspace/Del=delete, Esc=normal, Tab/Shift+Tab=fields"
+        }
+        AppMode::Highlight => {
+            "Visual: hjkl/arrows=extend selection, w/b/e=word selection, Esc=normal"
+        }
+        _ => "Press ? for help"
+    };
+
+    let help = Paragraph::new(Line::from(Span::raw(help_text)))
+        .block(Block::default().borders(Borders::ALL).title("Commands"))
+        .style(Style::default().fg(Color::Gray));
+
+    f.render_widget(help, chunks[1]);
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    let data = FullDemoData::new();
+    let mut editor = EnhancedFormEditor::new(data);
+    editor.set_mode(AppMode::ReadOnly); // Start in normal mode
+    
+    // Set initial cursor style
+    update_cursor_for_mode(editor.mode())?;
+
+    let res = run_app(&mut terminal, editor);
+
+    // Reset cursor style on exit
+    execute!(io::stdout(), SetCursorStyle::DefaultUserShape)?;
+
+    disable_raw_mode()?;
+    execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    terminal.show_cursor()?;
+
+    if let Err(err) = res {
+        println!("{:?}", err);
+    }
+
+    Ok(())
+}

canvas/examples/generate_template.rs

@@ -1,21 +0,0 @@
-// examples/generate_template.rs
-use canvas::config::CanvasConfig;
-use std::env;
-
-fn main() {
-    let args: Vec<String> = env::args().collect();
-    
-    if args.len() > 1 && args[1] == "clean" {
-        // Generate clean template with 80% active code
-        let template = CanvasConfig::generate_clean_template();
-        println!("{}", template);
-    } else {
-        // Generate verbose template with descriptions (default)
-        let template = CanvasConfig::generate_template();
-        println!("{}", template);
-    }
-}
-
-// Usage:
-//   cargo run --example generate_template > canvas_config.toml
-//   cargo run --example generate_template clean > canvas_config_clean.toml

canvas/examples/validation_1.rs

@@ -0,0 +1,831 @@
+// examples/validation_1.rs
+//! Demonstrates field validation with the canvas library
+//!
+//! This example REQUIRES the `validation` feature to compile.
+//!
+//! Run with:
+//! cargo run --example validation_1 --features "gui,validation"
+//!
+//! This will fail without validation:
+//! cargo run --example validation_1 --features "gui"
+
+// REQUIRE validation feature - example won't compile without it
+#[cfg(not(feature = "validation"))]
+compile_error!(
+    "This example requires the 'validation' feature. \
+     Run with: cargo run --example validation_1 --features \"gui,validation\""
+);
+
+use std::io;
+use crossterm::{
+    event::{
+        self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyModifiers,
+    },
+    execute,
+    terminal::{
+        disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
+    },
+};
+use ratatui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout, Rect},
+    style::{Color, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph, Wrap},
+    Frame, Terminal,
+};
+
+use canvas::{
+    canvas::{
+        gui::render_canvas_default,
+        modes::AppMode,
+    },
+    DataProvider, FormEditor,
+    ValidationConfig, ValidationConfigBuilder, CharacterLimits, ValidationResult,
+};
+
+// Import CountMode from the validation module directly
+use canvas::validation::limits::CountMode;
+
+// Enhanced FormEditor that demonstrates validation functionality
+struct ValidationFormEditor<D: DataProvider> {
+    editor: FormEditor<D>,
+    has_unsaved_changes: bool,
+    debug_message: String,
+    command_buffer: String,
+    validation_enabled: bool,
+    field_switch_blocked: bool,
+    block_reason: Option<String>,
+}
+
+impl<D: DataProvider> ValidationFormEditor<D> {
+    fn new(data_provider: D) -> Self {
+        let mut editor = FormEditor::new(data_provider);
+        
+        // Enable validation by default
+        editor.set_validation_enabled(true);
+        
+        Self {
+            editor,
+            has_unsaved_changes: false,
+            debug_message: "🔍 Validation Demo - Try typing in different fields!".to_string(),
+            command_buffer: String::new(),
+            validation_enabled: true,
+            field_switch_blocked: false,
+            block_reason: None,
+        }
+    }
+
+    // === COMMAND BUFFER HANDLING ===
+    fn clear_command_buffer(&mut self) {
+        self.command_buffer.clear();
+    }
+
+    fn add_to_command_buffer(&mut self, ch: char) {
+        self.command_buffer.push(ch);
+    }
+
+    fn get_command_buffer(&self) -> &str {
+        &self.command_buffer
+    }
+
+    fn has_pending_command(&self) -> bool {
+        !self.command_buffer.is_empty()
+    }
+
+    // === VALIDATION CONTROL ===
+    fn toggle_validation(&mut self) {
+        self.validation_enabled = !self.validation_enabled;
+        self.editor.set_validation_enabled(self.validation_enabled);
+        
+        if self.validation_enabled {
+            self.debug_message = "✅ Validation ENABLED - Try exceeding limits!".to_string();
+        } else {
+            self.debug_message = "❌ Validation DISABLED - No limits enforced".to_string();
+        }
+    }
+
+    fn check_field_switch_allowed(&self) -> (bool, Option<String>) {
+        if !self.validation_enabled {
+            return (true, None);
+        }
+        
+        let can_switch = self.editor.can_switch_fields();
+        let reason = if !can_switch {
+            self.editor.field_switch_block_reason()
+        } else {
+            None
+        };
+        
+        (can_switch, reason)
+    }
+
+    fn get_validation_status(&self) -> String {
+        if !self.validation_enabled {
+            return "❌ DISABLED".to_string();
+        }
+
+        if self.field_switch_blocked {
+            return "🚫 SWITCH BLOCKED".to_string();
+        }
+
+        let summary = self.editor.validation_summary();
+        if summary.has_errors() {
+            format!("❌ {} ERRORS", summary.error_fields)
+        } else if summary.has_warnings() {
+            format!("⚠️  {} WARNINGS", summary.warning_fields)
+        } else if summary.validated_fields > 0 {
+            format!("✅ {} VALID", summary.valid_fields)
+        } else {
+            "🔍 READY".to_string()
+        }
+    }
+
+    fn validate_current_field(&mut self) {
+        let result = self.editor.validate_current_field();
+        match result {
+            ValidationResult::Valid => {
+                self.debug_message = "✅ Current field is valid!".to_string();
+            }
+            ValidationResult::Warning { message } => {
+                self.debug_message = format!("⚠️  Warning: {}", message);
+            }
+            ValidationResult::Error { message } => {
+                self.debug_message = format!("❌ Error: {}", message);
+            }
+        }
+    }
+
+    fn validate_all_fields(&mut self) {
+        let field_count = self.editor.data_provider().field_count();
+        for i in 0..field_count {
+            self.editor.validate_field(i);
+        }
+        
+        let summary = self.editor.validation_summary();
+        self.debug_message = format!(
+            "🔍 Validated all fields: {} valid, {} warnings, {} errors",
+            summary.valid_fields, summary.warning_fields, summary.error_fields
+        );
+    }
+
+    fn clear_validation_results(&mut self) {
+        self.editor.clear_validation_results();
+        self.debug_message = "🧹 Cleared all validation results".to_string();
+    }
+
+    // === ENHANCED MOVEMENT WITH VALIDATION ===
+    fn move_left(&mut self) {
+        self.editor.move_left();
+        self.field_switch_blocked = false;
+        self.block_reason = None;
+    }
+
+    fn move_right(&mut self) {
+        self.editor.move_right();
+        self.field_switch_blocked = false;
+        self.block_reason = None;
+    }
+
+    fn move_up(&mut self) {
+        match self.editor.move_up() {
+            Ok(()) => {
+                self.update_field_validation_status();
+                self.field_switch_blocked = false;
+                self.block_reason = None;
+            }
+            Err(e) => {
+                self.field_switch_blocked = true;
+                self.block_reason = Some(e.to_string());
+                self.debug_message = format!("🚫 Field switch blocked: {}", e);
+            }
+        }
+    }
+
+    fn move_down(&mut self) {
+        match self.editor.move_down() {
+            Ok(()) => {
+                self.update_field_validation_status();
+                self.field_switch_blocked = false;
+                self.block_reason = None;
+            }
+            Err(e) => {
+                self.field_switch_blocked = true;
+                self.block_reason = Some(e.to_string());
+                self.debug_message = format!("🚫 Field switch blocked: {}", e);
+            }
+        }
+    }
+
+    fn move_line_start(&mut self) {
+        self.editor.move_line_start();
+    }
+
+    fn move_line_end(&mut self) {
+        self.editor.move_line_end();
+    }
+
+    fn move_word_next(&mut self) {
+        self.editor.move_word_next();
+    }
+
+    fn move_word_prev(&mut self) {
+        self.editor.move_word_prev();
+    }
+
+    fn move_word_end(&mut self) {
+        self.editor.move_word_end();
+    }
+
+    fn move_first_line(&mut self) {
+        self.editor.move_first_line();
+    }
+
+    fn move_last_line(&mut self) {
+        self.editor.move_last_line();
+    }
+
+    fn update_field_validation_status(&mut self) {
+        if !self.validation_enabled {
+            return;
+        }
+
+        if let Some(result) = self.editor.current_field_validation() {
+            match result {
+                ValidationResult::Valid => {
+                    self.debug_message = format!("Field {}: ✅ Valid", self.editor.current_field() + 1);
+                }
+                ValidationResult::Warning { message } => {
+                    self.debug_message = format!("Field {}: ⚠️  {}", self.editor.current_field() + 1, message);
+                }
+                ValidationResult::Error { message } => {
+                    self.debug_message = format!("Field {}: ❌ {}", self.editor.current_field() + 1, message);
+                }
+            }
+        } else {
+            self.debug_message = format!("Field {}: 🔍 Not validated yet", self.editor.current_field() + 1);
+        }
+    }
+
+    // === MODE TRANSITIONS ===
+    fn enter_edit_mode(&mut self) {
+        self.editor.enter_edit_mode();
+        self.debug_message = "✏️  INSERT MODE - Type to test validation".to_string();
+    }
+
+    fn enter_append_mode(&mut self) {
+        self.editor.enter_append_mode();
+        self.debug_message = "✏️  INSERT (append) - Validation active".to_string();
+    }
+
+    fn exit_edit_mode(&mut self) {
+        self.editor.exit_edit_mode();
+        self.debug_message = "🔒 NORMAL MODE - Press 'v' to validate current field".to_string();
+        self.update_field_validation_status();
+    }
+
+    fn insert_char(&mut self, ch: char) -> anyhow::Result<()> {
+        let result = self.editor.insert_char(ch);
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+            // Show real-time validation feedback
+            if let Some(validation_result) = self.editor.current_field_validation() {
+                match validation_result {
+                    ValidationResult::Valid => {
+                        // Don't spam with valid messages, just show character count if applicable
+                        if let Some(limits) = self.get_current_field_limits() {
+                            if let Some(status) = limits.status_text(self.editor.current_text()) {
+                                self.debug_message = format!("✏️  {}", status);
+                            }
+                        }
+                    }
+                    ValidationResult::Warning { message } => {
+                        self.debug_message = format!("⚠️  {}", message);
+                    }
+                    ValidationResult::Error { message } => {
+                        self.debug_message = format!("❌ {}", message);
+                    }
+                }
+            }
+        }
+        Ok(result?)
+    }
+
+    fn get_current_field_limits(&self) -> Option<&CharacterLimits> {
+        let validation_state = self.editor.validation_state();
+        let config = validation_state.get_field_config(self.editor.current_field())?;
+        config.character_limits.as_ref()
+    }
+
+    // === DELETE OPERATIONS ===
+    fn delete_backward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_backward();
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+            self.debug_message = "⌫ Deleted character".to_string();
+        }
+        Ok(result?)
+    }
+
+    fn delete_forward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_forward();
+        if result.is_ok() {
+            self.has_unsaved_changes = true;
+            self.debug_message = "⌦ Deleted character".to_string();
+        }
+        Ok(result?)
+    }
+
+    // === DELEGATE TO ORIGINAL EDITOR ===
+    fn current_field(&self) -> usize {
+        self.editor.current_field()
+    }
+
+    fn cursor_position(&self) -> usize {
+        self.editor.cursor_position()
+    }
+
+    fn mode(&self) -> AppMode {
+        self.editor.mode()
+    }
+
+    fn current_text(&self) -> &str {
+        self.editor.current_text()
+    }
+
+    fn data_provider(&self) -> &D {
+        self.editor.data_provider()
+    }
+
+    fn ui_state(&self) -> &canvas::EditorState {
+        self.editor.ui_state()
+    }
+
+    fn set_mode(&mut self, mode: AppMode) {
+        self.editor.set_mode(mode);
+    }
+
+    fn next_field(&mut self) {
+        match self.editor.next_field() {
+            Ok(()) => {
+                self.update_field_validation_status();
+                self.field_switch_blocked = false;
+                self.block_reason = None;
+            }
+            Err(e) => {
+                self.field_switch_blocked = true;
+                self.block_reason = Some(e.to_string());
+                self.debug_message = format!("🚫 Cannot move to next field: {}", e);
+            }
+        }
+    }
+
+    fn prev_field(&mut self) {
+        match self.editor.prev_field() {
+            Ok(()) => {
+                self.update_field_validation_status();
+                self.field_switch_blocked = false;
+                self.block_reason = None;
+            }
+            Err(e) => {
+                self.field_switch_blocked = true;
+                self.block_reason = Some(e.to_string());
+                self.debug_message = format!("🚫 Cannot move to previous field: {}", e);
+            }
+        }
+    }
+
+    // === STATUS AND DEBUG ===
+    fn set_debug_message(&mut self, msg: String) {
+        self.debug_message = msg;
+    }
+
+    fn debug_message(&self) -> &str {
+        &self.debug_message
+    }
+
+    fn has_unsaved_changes(&self) -> bool {
+        self.has_unsaved_changes
+    }
+}
+
+// Demo form data with different validation rules
+struct ValidationDemoData {
+    fields: Vec<(String, String)>,
+}
+
+impl ValidationDemoData {
+    fn new() -> Self {
+        Self {
+            fields: vec![
+                ("👤 Name (max 20)".to_string(), "".to_string()),
+                ("📧 Email (max 50, warn@40)".to_string(), "".to_string()),
+                ("🔑 Password (5-20 chars)".to_string(), "".to_string()),
+                ("🔢 ID (min 3, max 10)".to_string(), "".to_string()),
+                ("📝 Comment (min 10, max 100)".to_string(), "".to_string()),
+                ("🏷️  Tag (max 30, bytes)".to_string(), "".to_string()),
+                ("🌍 Unicode (width, min 2)".to_string(), "".to_string()),
+            ],
+        }
+    }
+}
+
+impl DataProvider for ValidationDemoData {
+    fn field_count(&self) -> usize {
+        self.fields.len()
+    }
+
+    fn field_name(&self, index: usize) -> &str {
+        &self.fields[index].0
+    }
+
+    fn field_value(&self, index: usize) -> &str {
+        &self.fields[index].1
+    }
+
+    fn set_field_value(&mut self, index: usize, value: String) {
+        self.fields[index].1 = value;
+    }
+
+    fn supports_autocomplete(&self, _field_index: usize) -> bool {
+        false
+    }
+
+    fn display_value(&self, _index: usize) -> Option<&str> {
+        None
+    }
+
+    // 🎯 NEW: Validation configuration per field
+    fn validation_config(&self, field_index: usize) -> Option<ValidationConfig> {
+        match field_index {
+            0 => Some(ValidationConfig::with_max_length(20)), // Name: simple 20 char limit
+            1 => Some(
+                ValidationConfigBuilder::new()
+                    .with_character_limits(
+                        CharacterLimits::new(50).with_warning_threshold(40)
+                    )
+                    .build()
+            ), // Email: 50 chars with warning at 40
+            2 => Some(
+                ValidationConfigBuilder::new()
+                    .with_character_limits(CharacterLimits::new_range(5, 20))
+                    .build()
+            ), // Password: must be 5-20 characters (blocks field switching if 1-4 chars)
+            3 => Some(
+                ValidationConfigBuilder::new()
+                    .with_character_limits(CharacterLimits::new_range(3, 10))
+                    .build()
+            ), // ID: must be 3-10 characters (blocks field switching if 1-2 chars)
+            4 => Some(
+                ValidationConfigBuilder::new()
+                    .with_character_limits(CharacterLimits::new_range(10, 100))
+                    .build()
+            ), // Comment: must be 10-100 characters (blocks field switching if 1-9 chars)
+            5 => Some(
+                ValidationConfigBuilder::new()
+                    .with_character_limits(
+                        CharacterLimits::new(30).with_count_mode(CountMode::Bytes)
+                    )
+                    .build()
+            ), // Tag: 30 bytes (useful for UTF-8)
+            6 => Some(
+                ValidationConfigBuilder::new()
+                    .with_character_limits(
+                        CharacterLimits::new_range(2, 20).with_count_mode(CountMode::DisplayWidth)
+                    )
+                    .build()
+            ), // Unicode: 2-20 display width (useful for CJK characters, blocks if 1 char)
+            _ => None,
+        }
+    }
+}
+
+/// Handle key presses with validation-focused commands
+fn handle_key_press(
+    key: KeyCode,
+    modifiers: KeyModifiers,
+    editor: &mut ValidationFormEditor<ValidationDemoData>,
+) -> anyhow::Result<bool> {
+    let mode = editor.mode();
+
+    // Quit handling
+    if (key == KeyCode::Char('q') && modifiers.contains(KeyModifiers::CONTROL))
+        || (key == KeyCode::Char('c') && modifiers.contains(KeyModifiers::CONTROL))
+        || key == KeyCode::F(10)
+    {
+        return Ok(false);
+    }
+
+    match (mode, key, modifiers) {
+        // === MODE TRANSITIONS ===
+        (AppMode::ReadOnly, KeyCode::Char('i'), _) => {
+            editor.enter_edit_mode();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('a'), _) => {
+            editor.enter_append_mode();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('A'), _) => {
+            editor.move_line_end();
+            editor.enter_edit_mode();
+            editor.clear_command_buffer();
+        }
+
+        // Escape: Exit edit mode
+        (_, KeyCode::Esc, _) => {
+            if mode == AppMode::Edit {
+                editor.exit_edit_mode();
+            } else {
+                editor.clear_command_buffer();
+            }
+        }
+
+        // === VALIDATION COMMANDS ===
+        (AppMode::ReadOnly, KeyCode::Char('v'), _) => {
+            editor.validate_current_field();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('V'), _) => {
+            editor.validate_all_fields();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('c'), _) => {
+            editor.clear_validation_results();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::F(1), _) => {
+            editor.toggle_validation();
+        }
+
+        // === MOVEMENT ===
+        (AppMode::ReadOnly, KeyCode::Char('h'), _) | (AppMode::ReadOnly, KeyCode::Left, _) => {
+            editor.move_left();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('l'), _) | (AppMode::ReadOnly, KeyCode::Right, _) => {
+            editor.move_right();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('j'), _) | (AppMode::ReadOnly, KeyCode::Down, _) => {
+            editor.move_down();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('k'), _) | (AppMode::ReadOnly, KeyCode::Up, _) => {
+            editor.move_up();
+            editor.clear_command_buffer();
+        }
+
+        // === EDIT MODE MOVEMENT ===
+        (AppMode::Edit, KeyCode::Left, _) => {
+            editor.move_left();
+        }
+        (AppMode::Edit, KeyCode::Right, _) => {
+            editor.move_right();
+        }
+        (AppMode::Edit, KeyCode::Up, _) => {
+            editor.move_up();
+        }
+        (AppMode::Edit, KeyCode::Down, _) => {
+            editor.move_down();
+        }
+
+        // === DELETE OPERATIONS ===
+        (AppMode::Edit, KeyCode::Backspace, _) => {
+            editor.delete_backward()?;
+        }
+        (AppMode::Edit, KeyCode::Delete, _) => {
+            editor.delete_forward()?;
+        }
+
+        // === TAB NAVIGATION ===
+        (_, KeyCode::Tab, _) => {
+            editor.next_field();
+        }
+        (_, KeyCode::BackTab, _) => {
+            editor.prev_field();
+        }
+
+        // === CHARACTER INPUT ===
+        (AppMode::Edit, KeyCode::Char(c), m) if !m.contains(KeyModifiers::CONTROL) => {
+            editor.insert_char(c)?;
+        }
+
+        // === DEBUG/INFO COMMANDS ===
+        (AppMode::ReadOnly, KeyCode::Char('?'), _) => {
+            let summary = editor.editor.validation_summary();
+            editor.set_debug_message(format!(
+                "Field {}/{}, Pos {}, Mode: {:?}, Validation: {} fields configured, {} validated",
+                editor.current_field() + 1,
+                editor.data_provider().field_count(),
+                editor.cursor_position(),
+                editor.mode(),
+                summary.total_fields,
+                summary.validated_fields
+            ));
+        }
+
+        _ => {
+            if editor.has_pending_command() {
+                editor.clear_command_buffer();
+                editor.set_debug_message("Invalid command sequence".to_string());
+            }
+        }
+    }
+
+    Ok(true)
+}
+
+fn run_app<B: Backend>(
+    terminal: &mut Terminal<B>,
+    mut editor: ValidationFormEditor<ValidationDemoData>,
+) -> io::Result<()> {
+    loop {
+        terminal.draw(|f| ui(f, &editor))?;
+
+        if let Event::Key(key) = event::read()? {
+            match handle_key_press(key.code, key.modifiers, &mut editor) {
+                Ok(should_continue) => {
+                    if !should_continue {
+                        break;
+                    }
+                }
+                Err(e) => {
+                    editor.set_debug_message(format!("Error: {}", e));
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn ui(f: &mut Frame, editor: &ValidationFormEditor<ValidationDemoData>) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Constraint::Min(8), Constraint::Length(12)])
+        .split(f.area());
+
+    render_enhanced_canvas(f, chunks[0], editor);
+    render_validation_status(f, chunks[1], editor);
+}
+
+fn render_enhanced_canvas(
+    f: &mut Frame,
+    area: Rect,
+    editor: &ValidationFormEditor<ValidationDemoData>,
+) {
+    render_canvas_default(f, area, &editor.editor);
+}
+
+fn render_validation_status(
+    f: &mut Frame,
+    area: Rect,
+    editor: &ValidationFormEditor<ValidationDemoData>,
+) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Length(3), // Status bar
+            Constraint::Length(4), // Validation summary
+            Constraint::Length(5), // Help
+        ])
+        .split(area);
+
+    // Status bar with validation information
+    let mode_text = match editor.mode() {
+        AppMode::Edit => "INSERT",
+        AppMode::ReadOnly => "NORMAL",
+        _ => "OTHER",
+    };
+
+    let validation_status = editor.get_validation_status();
+    let status_text = if editor.has_pending_command() {
+        format!("-- {} -- {} [{}] | Validation: {}", 
+                mode_text, editor.debug_message(), editor.get_command_buffer(), validation_status)
+    } else if editor.has_unsaved_changes() {
+        format!("-- {} -- [Modified] {} | Validation: {}", 
+                mode_text, editor.debug_message(), validation_status)
+    } else {
+        format!("-- {} -- {} | Validation: {}", 
+                mode_text, editor.debug_message(), validation_status)
+    };
+
+    let status = Paragraph::new(Line::from(Span::raw(status_text)))
+        .block(Block::default().borders(Borders::ALL).title("🔍 Validation Status"));
+
+    f.render_widget(status, chunks[0]);
+
+    // Validation summary with field switching info
+    let summary = editor.editor.validation_summary();
+    let summary_text = if editor.validation_enabled {
+        let switch_info = if editor.field_switch_blocked {
+            format!("\n🚫 Field switching blocked: {}", 
+                   editor.block_reason.as_deref().unwrap_or("Unknown reason"))
+        } else {
+            let (can_switch, reason) = editor.check_field_switch_allowed();
+            if !can_switch {
+                format!("\n⚠️  Field switching will be blocked: {}",
+                       reason.as_deref().unwrap_or("Unknown reason"))
+            } else {
+                "\n✅ Field switching allowed".to_string()
+            }
+        };
+        
+        format!(
+            "📊 Validation Summary: {} fields configured, {} validated{}\n\
+             ✅ Valid: {}  ⚠️  Warnings: {}  ❌ Errors: {}  📈 Progress: {:.0}%",
+            summary.total_fields,
+            summary.validated_fields,
+            switch_info,
+            summary.valid_fields,
+            summary.warning_fields,
+            summary.error_fields,
+            summary.completion_percentage() * 100.0
+        )
+    } else {
+        "❌ Validation is currently DISABLED\nPress F1 to enable validation".to_string()
+    };
+
+    let summary_style = if summary.has_errors() {
+        Style::default().fg(Color::Red)
+    } else if summary.has_warnings() {
+        Style::default().fg(Color::Yellow)
+    } else {
+        Style::default().fg(Color::Green)
+    };
+
+    let validation_summary = Paragraph::new(summary_text)
+        .block(Block::default().borders(Borders::ALL).title("📈 Validation Overview"))
+        .style(summary_style)
+        .wrap(Wrap { trim: true });
+
+    f.render_widget(validation_summary, chunks[1]);
+
+    // Enhanced help text
+    let help_text = match editor.mode() {
+        AppMode::ReadOnly => {
+            "🔍 VALIDATION DEMO: Different fields have different limits!\n\
+             Fields with MINIMUM requirements will block field switching if too short!\n\
+             Movement: hjkl/arrows=move, Tab/Shift+Tab=fields\n\
+             Edit: i/a/A=insert modes, Esc=normal\n\
+             Validation: v=validate current, V=validate all, c=clear results, F1=toggle\n\
+             ?=info, Ctrl+C/Ctrl+Q=quit"
+        }
+        AppMode::Edit => {
+            "✏️  INSERT MODE - Type to test validation limits!\n\
+             Some fields have MINIMUM character requirements!\n\
+             Try typing 1-2 chars in Password/ID/Comment fields, then try to switch!\n\
+             arrows=move, Backspace/Del=delete, Esc=normal, Tab=next field\n\
+             Field switching may be BLOCKED if minimum requirements not met!"
+        }
+        _ => "🔍 Validation Demo Active!"
+    };
+
+    let help = Paragraph::new(help_text)
+        .block(Block::default().borders(Borders::ALL).title("🚀 Validation Commands"))
+        .style(Style::default().fg(Color::Gray))
+        .wrap(Wrap { trim: true });
+
+    f.render_widget(help, chunks[2]);
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Print feature status
+    println!("🔍 Canvas Validation Demo");
+    println!("✅ validation feature: ENABLED");
+    println!("🚀 Field validation: ACTIVE");
+    println!("🚫 Field switching validation: ACTIVE");
+    println!("📊 Try typing in fields with minimum requirements!");
+    println!("   - Password (min 5): Type 1-4 chars, then try to switch fields");
+    println!("   - ID (min 3): Type 1-2 chars, then try to switch fields");
+    println!("   - Comment (min 10): Type 1-9 chars, then try to switch fields");
+    println!("   - Unicode (min 2): Type 1 char, then try to switch fields");
+    println!();
+
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    let data = ValidationDemoData::new();
+    let editor = ValidationFormEditor::new(data);
+
+    let res = run_app(&mut terminal, editor);
+
+    disable_raw_mode()?;
+    execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    terminal.show_cursor()?;
+
+    if let Err(err) = res {
+        println!("{:?}", err);
+    }
+
+    println!("🔍 Validation demo completed!");
+    Ok(())
+}

canvas/examples/validation_2.rs

@@ -0,0 +1,647 @@
+// examples/validation_2.rs
+//! Advanced TUI Example demonstrating complex pattern filtering edge cases
+//!
+//! This example showcases the full potential of the pattern validation system
+//! with creative real-world scenarios and edge cases.
+//!
+//! Run with: cargo run --example validation_advanced_patterns --features "validation,gui"
+
+// REQUIRE validation and gui features
+#[cfg(not(all(feature = "validation", feature = "gui")))]
+compile_error!(
+    "This example requires the 'validation' and 'gui' features. \
+     Run with: cargo run --example validation_advanced_patterns --features \"validation,gui\""
+);
+
+use std::io;
+use std::sync::Arc;
+use canvas::ValidationResult;
+use crossterm::{
+    event::{
+        self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyModifiers,
+    },
+    execute,
+    terminal::{
+        disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
+    },
+};
+use ratatui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout, Rect},
+    style::{Color, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph, Wrap},
+    Frame, Terminal,
+};
+
+use canvas::{
+    canvas::{
+        gui::render_canvas_default,
+        modes::AppMode,
+    },
+    DataProvider, FormEditor,
+    ValidationConfig, ValidationConfigBuilder, PatternFilters, PositionFilter, PositionRange, CharacterFilter,
+};
+
+// Enhanced FormEditor wrapper (keeping the same structure as before)
+struct AdvancedPatternFormEditor<D: DataProvider> {
+    editor: FormEditor<D>,
+    debug_message: String,
+    command_buffer: String,
+    validation_enabled: bool,
+    field_switch_blocked: bool,
+    block_reason: Option<String>,
+}
+
+impl<D: DataProvider> AdvancedPatternFormEditor<D> {
+    fn new(data_provider: D) -> Self {
+        let mut editor = FormEditor::new(data_provider);
+        editor.set_validation_enabled(true);
+
+        Self {
+            editor,
+            debug_message: "🚀 Advanced Pattern Validation - Showcasing edge cases and complex patterns!".to_string(),
+            command_buffer: String::new(),
+            validation_enabled: true,
+            field_switch_blocked: false,
+            block_reason: None,
+        }
+    }
+
+    // ... (keeping all the same methods as before for brevity)
+    // [All the previous methods: clear_command_buffer, add_to_command_buffer, etc.]
+    
+    fn clear_command_buffer(&mut self) { self.command_buffer.clear(); }
+    fn add_to_command_buffer(&mut self, ch: char) { self.command_buffer.push(ch); }
+    fn get_command_buffer(&self) -> &str { &self.command_buffer }
+    fn has_pending_command(&self) -> bool { !self.command_buffer.is_empty() }
+    
+    fn toggle_validation(&mut self) {
+        self.validation_enabled = !self.validation_enabled;
+        self.editor.set_validation_enabled(self.validation_enabled);
+        if self.validation_enabled {
+            self.debug_message = "✅ Advanced Pattern Validation ENABLED".to_string();
+        } else {
+            self.debug_message = "❌ Advanced Pattern Validation DISABLED".to_string();
+        }
+    }
+
+    fn move_left(&mut self) { self.editor.move_left(); self.field_switch_blocked = false; self.block_reason = None; }
+    fn move_right(&mut self) { self.editor.move_right(); self.field_switch_blocked = false; self.block_reason = None; }
+    
+    fn move_up(&mut self) {
+        match self.editor.move_up() {
+            Ok(()) => { self.update_field_validation_status(); self.field_switch_blocked = false; self.block_reason = None; }
+            Err(e) => { self.field_switch_blocked = true; self.block_reason = Some(e.to_string()); self.debug_message = format!("🚫 Field switch blocked: {}", e); }
+        }
+    }
+    
+    fn move_down(&mut self) {
+        match self.editor.move_down() {
+            Ok(()) => { self.update_field_validation_status(); self.field_switch_blocked = false; self.block_reason = None; }
+            Err(e) => { self.field_switch_blocked = true; self.block_reason = Some(e.to_string()); self.debug_message = format!("🚫 Field switch blocked: {}", e); }
+        }
+    }
+
+    fn move_line_start(&mut self) { self.editor.move_line_start(); }
+    fn move_line_end(&mut self) { self.editor.move_line_end(); }
+    
+    fn enter_edit_mode(&mut self) {
+        self.editor.enter_edit_mode();
+        self.debug_message = "✏️  INSERT MODE - Testing advanced pattern validation".to_string();
+    }
+    
+    fn enter_append_mode(&mut self) {
+        self.editor.enter_append_mode();
+        self.debug_message = "✏️  INSERT (append) - Advanced patterns active".to_string();
+    }
+    
+    fn exit_edit_mode(&mut self) {
+        self.editor.exit_edit_mode();
+        self.debug_message = "🔒 NORMAL MODE".to_string();
+        self.update_field_validation_status();
+    }
+
+    fn insert_char(&mut self, ch: char) -> anyhow::Result<()> {
+        let result = self.editor.insert_char(ch);
+        if result.is_ok() {
+            if let Some(validation_result) = self.editor.current_field_validation() {
+                match validation_result {
+                    ValidationResult::Valid => { self.debug_message = "✅ Character accepted".to_string(); }
+                    ValidationResult::Warning { message } => { self.debug_message = format!("⚠️  Warning: {}", message); }
+                    ValidationResult::Error { message } => { self.debug_message = format!("❌ Pattern violation: {}", message); }
+                }
+            }
+        }
+        Ok(result?)
+    }
+
+    fn delete_backward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_backward();
+        if result.is_ok() { self.debug_message = "⌫ Character deleted".to_string(); }
+        Ok(result?)
+    }
+
+    fn delete_forward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_forward();
+        if result.is_ok() { self.debug_message = "⌦ Character deleted".to_string(); }
+        Ok(result?)
+    }
+
+    // Delegate methods
+    fn current_field(&self) -> usize { self.editor.current_field() }
+    fn cursor_position(&self) -> usize { self.editor.cursor_position() }
+    fn mode(&self) -> AppMode { self.editor.mode() }
+    fn current_text(&self) -> &str { self.editor.current_text() }
+    fn data_provider(&self) -> &D { self.editor.data_provider() }
+    fn ui_state(&self) -> &canvas::EditorState { self.editor.ui_state() }
+    fn set_mode(&mut self, mode: AppMode) { self.editor.set_mode(mode); }
+
+    fn next_field(&mut self) {
+        match self.editor.next_field() {
+            Ok(()) => { self.update_field_validation_status(); self.field_switch_blocked = false; self.block_reason = None; }
+            Err(e) => { self.field_switch_blocked = true; self.block_reason = Some(e.to_string()); self.debug_message = format!("🚫 Cannot move to next field: {}", e); }
+        }
+    }
+
+    fn prev_field(&mut self) {
+        match self.editor.prev_field() {
+            Ok(()) => { self.update_field_validation_status(); self.field_switch_blocked = false; self.block_reason = None; }
+            Err(e) => { self.field_switch_blocked = true; self.block_reason = Some(e.to_string()); self.debug_message = format!("🚫 Cannot move to previous field: {}", e); }
+        }
+    }
+
+    fn set_debug_message(&mut self, msg: String) { self.debug_message = msg; }
+    fn debug_message(&self) -> &str { &self.debug_message }
+
+    fn update_field_validation_status(&mut self) {
+        if !self.validation_enabled { return; }
+        if let Some(result) = self.editor.current_field_validation() {
+            match result {
+                ValidationResult::Valid => { self.debug_message = format!("Field {}: ✅ Pattern valid", self.editor.current_field() + 1); }
+                ValidationResult::Warning { message } => { self.debug_message = format!("Field {}: ⚠️  {}", self.editor.current_field() + 1, message); }
+                ValidationResult::Error { message } => { self.debug_message = format!("Field {}: ❌ {}", self.editor.current_field() + 1, message); }
+            }
+        }
+    }
+
+    fn get_validation_status(&self) -> String {
+        if !self.validation_enabled { return "❌ DISABLED".to_string(); }
+        if self.field_switch_blocked { return "🚫 SWITCH BLOCKED".to_string(); }
+        let summary = self.editor.validation_summary();
+        if summary.has_errors() { format!("❌ {} ERRORS", summary.error_fields) }
+        else if summary.has_warnings() { format!("⚠️  {} WARNINGS", summary.warning_fields) }
+        else if summary.validated_fields > 0 { format!("✅ {} VALID", summary.valid_fields) }
+        else { "🔍 READY".to_string() }
+    }
+}
+
+// Advanced demo form with creative and edge-case-heavy validation patterns
+struct AdvancedPatternData {
+    fields: Vec<(String, String)>,
+}
+
+impl AdvancedPatternData {
+    fn new() -> Self {
+        Self {
+            fields: vec![
+                ("🕐 Time (HH:MM) - 24hr format".to_string(), "".to_string()),
+                ("🎨 Hex Color (#RRGGBB) - Web colors".to_string(), "".to_string()),
+                ("🌐 IPv4 (XXX.XXX.XXX.XXX) - Network address".to_string(), "".to_string()),
+                ("🏷️  Product Code (ABC-123-XYZ) - Mixed format".to_string(), "".to_string()),
+                ("📅 Date Code (2024W15) - Year + Week".to_string(), "".to_string()),
+                ("🔢 Binary (101010) - Only 0s and 1s".to_string(), "".to_string()),
+                ("🎯 Complex ID (A1-B2C-3D4E) - Multi-rule".to_string(), "".to_string()),
+                ("🚀 Custom Pattern - Advanced logic".to_string(), "".to_string()),
+            ],
+        }
+    }
+}
+
+impl DataProvider for AdvancedPatternData {
+    fn field_count(&self) -> usize { self.fields.len() }
+    fn field_name(&self, index: usize) -> &str { &self.fields[index].0 }
+    fn field_value(&self, index: usize) -> &str { &self.fields[index].1 }
+    fn set_field_value(&mut self, index: usize, value: String) { self.fields[index].1 = value; }
+
+    fn validation_config(&self, field_index: usize) -> Option<ValidationConfig> {
+        match field_index {
+            0 => {
+                // 🕐 Time (HH:MM) - Hours 00-23, Minutes 00-59
+                // This showcases: Multiple position ranges, exact character matching, custom validation
+                let time_pattern = PatternFilters::new()
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Multiple(vec![0, 1, 3, 4]), // Hours and minutes positions
+                        CharacterFilter::Numeric,
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Single(2), // Colon separator
+                        CharacterFilter::Exact(':'),
+                    ));
+
+                Some(ValidationConfigBuilder::new()
+                    .with_pattern_filters(time_pattern)
+                    .with_max_length(5) // HH:MM = 5 characters
+                    .build())
+            }
+            1 => {
+                // 🎨 Hex Color (#RRGGBB) - Web color format
+                // This showcases: OneOf filter with hex digits, exact character at start
+                let hex_digits = vec!['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','a','b','c','d','e','f'];
+                let hex_color_pattern = PatternFilters::new()
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Single(0), // Hash symbol
+                        CharacterFilter::Exact('#'),
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Range(1, 6), // 6 hex digits for RGB
+                        CharacterFilter::OneOf(hex_digits),
+                    ));
+
+                Some(ValidationConfigBuilder::new()
+                    .with_pattern_filters(hex_color_pattern)
+                    .with_max_length(7) // #RRGGBB = 7 characters
+                    .build())
+            }
+            2 => {
+                // 🌐 IPv4 Address (XXX.XXX.XXX.XXX) - Network address
+                // This showcases: Complex pattern with dots at specific positions
+                let ipv4_pattern = PatternFilters::new()
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Multiple(vec![3, 7, 11]), // Dots at specific positions
+                        CharacterFilter::Exact('.'),
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Multiple(vec![0,1,2,4,5,6,8,9,10,12,13,14]), // Number positions
+                        CharacterFilter::Numeric,
+                    ));
+
+                Some(ValidationConfigBuilder::new()
+                    .with_pattern_filters(ipv4_pattern)
+                    .with_max_length(15) // XXX.XXX.XXX.XXX = up to 15 chars
+                    .build())
+            }
+            3 => {
+                // 🏷️ Product Code (ABC-123-XYZ) - Mixed format sections
+                // This showcases: Different rules for different sections
+                let product_code_pattern = PatternFilters::new()
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Range(0, 2), // First 3 positions: letters
+                        CharacterFilter::Alphabetic,
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Multiple(vec![3, 7]), // Dashes
+                        CharacterFilter::Exact('-'),
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Range(4, 6), // Middle 3 positions: numbers
+                        CharacterFilter::Numeric,
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Range(8, 10), // Last 3 positions: letters
+                        CharacterFilter::Alphabetic,
+                    ));
+
+                Some(ValidationConfigBuilder::new()
+                    .with_pattern_filters(product_code_pattern)
+                    .with_max_length(11) // ABC-123-XYZ = 11 characters
+                    .build())
+            }
+            4 => {
+                // 📅 Date Code (2024W15) - Year + Week format
+                // This showcases: From position filtering and mixed patterns
+                let date_code_pattern = PatternFilters::new()
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Range(0, 3), // Year: 4 digits
+                        CharacterFilter::Numeric,
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Single(4), // Week indicator
+                        CharacterFilter::Exact('W'),
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::From(5), // Week number: rest are digits
+                        CharacterFilter::Numeric,
+                    ));
+
+                Some(ValidationConfigBuilder::new()
+                    .with_pattern_filters(date_code_pattern)
+                    .with_max_length(7) // 2024W15 = 7 characters
+                    .build())
+            }
+            5 => {
+                // 🔢 Binary (101010) - Only 0s and 1s
+                // This showcases: OneOf filter with limited character set
+                let binary_pattern = PatternFilters::new()
+                    .add_filter(PositionFilter::new(
+                        PositionRange::From(0), // All positions
+                        CharacterFilter::OneOf(vec!['0', '1']),
+                    ));
+
+                Some(ValidationConfigBuilder::new()
+                    .with_pattern_filters(binary_pattern)
+                    .with_max_length(16) // Allow up to 16 binary digits
+                    .build())
+            }
+            6 => {
+                // 🎯 Complex ID (A1-B2C-3D4E) - Multiple overlapping rules
+                // This showcases: Complex overlapping patterns and edge cases
+                let complex_id_pattern = PatternFilters::new()
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Multiple(vec![0, 3, 6, 8]), // Letter positions
+                        CharacterFilter::Alphabetic,
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Multiple(vec![1, 4, 7, 9]), // Number positions
+                        CharacterFilter::Numeric,
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Multiple(vec![2, 5]), // Dashes
+                        CharacterFilter::Exact('-'),
+                    ))
+                    .add_filter(PositionFilter::new(
+                        PositionRange::Single(5), // Special case: override dash with letter C
+                        CharacterFilter::Alphabetic, // This creates an interesting edge case
+                    ));
+
+                Some(ValidationConfigBuilder::new()
+                    .with_pattern_filters(complex_id_pattern)
+                    .with_max_length(10) // A1-B2C-3D4E = 10 characters
+                    .build())
+            }
+            7 => {
+                // 🚀 Custom Pattern - Advanced logic with custom function
+                // This showcases: Custom validation function for complex rules
+                let custom_pattern = PatternFilters::new()
+                    .add_filter(PositionFilter::new(
+                        PositionRange::From(0),
+                        CharacterFilter::Custom(Arc::new(|c| {
+                            // Advanced rule: Alternating vowels and consonants!
+                            // Even positions (0,2,4...): vowels (a,e,i,o,u)
+                            // Odd positions (1,3,5...): consonants
+                            let vowels = ['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'];
+                            
+                            // For demo purposes, we'll just accept alphabetic characters
+                            // In real usage, you'd implement the alternating logic based on position
+                            c.is_alphabetic()
+                        })),
+                    ));
+
+                Some(ValidationConfigBuilder::new()
+                    .with_pattern_filters(custom_pattern)
+                    .with_max_length(12) // Allow up to 12 characters
+                    .build())
+            }
+            _ => None,
+        }
+    }
+}
+
+// Key handling (same structure as before)
+fn handle_key_press(
+    key: KeyCode,
+    modifiers: KeyModifiers,
+    editor: &mut AdvancedPatternFormEditor<AdvancedPatternData>,
+) -> anyhow::Result<bool> {
+    let mode = editor.mode();
+
+    // Quit handling
+    if (key == KeyCode::Char('q') && modifiers.contains(KeyModifiers::CONTROL))
+        || (key == KeyCode::Char('c') && modifiers.contains(KeyModifiers::CONTROL))
+        || key == KeyCode::F(10)
+    {
+        return Ok(false);
+    }
+
+    match (mode, key, modifiers) {
+        // Mode transitions
+        (AppMode::ReadOnly, KeyCode::Char('i'), _) => { editor.enter_edit_mode(); editor.clear_command_buffer(); }
+        (AppMode::ReadOnly, KeyCode::Char('a'), _) => { editor.enter_append_mode(); editor.clear_command_buffer(); }
+        (AppMode::ReadOnly, KeyCode::Char('A'), _) => { editor.move_line_end(); editor.enter_edit_mode(); editor.clear_command_buffer(); }
+        (_, KeyCode::Esc, _) => { if mode == AppMode::Edit { editor.exit_edit_mode(); } else { editor.clear_command_buffer(); } }
+
+        // Validation commands
+        (AppMode::ReadOnly, KeyCode::F(1), _) => { editor.toggle_validation(); }
+
+        // Movement in ReadOnly mode
+        (AppMode::ReadOnly, KeyCode::Char('h'), _) | (AppMode::ReadOnly, KeyCode::Left, _) => { editor.move_left(); editor.clear_command_buffer(); }
+        (AppMode::ReadOnly, KeyCode::Char('l'), _) | (AppMode::ReadOnly, KeyCode::Right, _) => { editor.move_right(); editor.clear_command_buffer(); }
+        (AppMode::ReadOnly, KeyCode::Char('j'), _) | (AppMode::ReadOnly, KeyCode::Down, _) => { editor.move_down(); editor.clear_command_buffer(); }
+        (AppMode::ReadOnly, KeyCode::Char('k'), _) | (AppMode::ReadOnly, KeyCode::Up, _) => { editor.move_up(); editor.clear_command_buffer(); }
+
+        // Movement in Edit mode
+        (AppMode::Edit, KeyCode::Left, _) => { editor.move_left(); }
+        (AppMode::Edit, KeyCode::Right, _) => { editor.move_right(); }
+        (AppMode::Edit, KeyCode::Up, _) => { editor.move_up(); }
+        (AppMode::Edit, KeyCode::Down, _) => { editor.move_down(); }
+
+        // Delete operations
+        (AppMode::Edit, KeyCode::Backspace, _) => { editor.delete_backward()?; }
+        (AppMode::Edit, KeyCode::Delete, _) => { editor.delete_forward()?; }
+
+        // Tab navigation
+        (_, KeyCode::Tab, _) => { editor.next_field(); }
+        (_, KeyCode::BackTab, _) => { editor.prev_field(); }
+
+        // Character input
+        (AppMode::Edit, KeyCode::Char(c), m) if !m.contains(KeyModifiers::CONTROL) => {
+            editor.insert_char(c)?;
+        }
+
+        // Debug info
+        (AppMode::ReadOnly, KeyCode::Char('?'), _) => {
+            let summary = editor.editor.validation_summary();
+            editor.set_debug_message(format!(
+                "Field {}/{}, Pos {}, Mode: {:?}, Advanced patterns: {} configured",
+                editor.current_field() + 1,
+                editor.data_provider().field_count(),
+                editor.cursor_position(),
+                editor.mode(),
+                summary.total_fields
+            ));
+        }
+
+        _ => {
+            if editor.has_pending_command() {
+                editor.clear_command_buffer();
+                editor.set_debug_message("Invalid command sequence".to_string());
+            }
+        }
+    }
+
+    Ok(true)
+}
+
+fn run_app<B: Backend>(
+    terminal: &mut Terminal<B>,
+    mut editor: AdvancedPatternFormEditor<AdvancedPatternData>,
+) -> io::Result<()> {
+    loop {
+        terminal.draw(|f| ui(f, &editor))?;
+
+        if let Event::Key(key) = event::read()? {
+            match handle_key_press(key.code, key.modifiers, &mut editor) {
+                Ok(should_continue) => {
+                    if !should_continue {
+                        break;
+                    }
+                }
+                Err(e) => {
+                    editor.set_debug_message(format!("Error: {}", e));
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn ui(f: &mut Frame, editor: &AdvancedPatternFormEditor<AdvancedPatternData>) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Constraint::Min(8), Constraint::Length(15)])
+        .split(f.area());
+
+    render_canvas_default(f, chunks[0], &editor.editor);
+    render_advanced_validation_status(f, chunks[1], editor);
+}
+
+fn render_advanced_validation_status(
+    f: &mut Frame,
+    area: Rect,
+    editor: &AdvancedPatternFormEditor<AdvancedPatternData>,
+) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Length(3), // Status bar
+            Constraint::Length(5), // Validation summary
+            Constraint::Length(7), // Help
+        ])
+        .split(area);
+
+    // Status bar
+    let mode_text = match editor.mode() {
+        AppMode::Edit => "INSERT",
+        AppMode::ReadOnly => "NORMAL",
+        _ => "OTHER",
+    };
+
+    let validation_status = editor.get_validation_status();
+    let status_text = format!("-- {} -- {} | Advanced Patterns: {}", mode_text, editor.debug_message(), validation_status);
+
+    let status = Paragraph::new(Line::from(Span::raw(status_text)))
+        .block(Block::default().borders(Borders::ALL).title("🚀 Advanced Pattern Validation"));
+
+    f.render_widget(status, chunks[0]);
+
+    // Enhanced validation summary
+    let summary = editor.editor.validation_summary();
+    let field_info = match editor.current_field() {
+        0 => "Time format (HH:MM) - Tests exact chars + numeric ranges",
+        1 => "Hex color (#RRGGBB) - Tests OneOf filter with case insensitive",
+        2 => "IPv4 address - Tests complex dot positioning",
+        3 => "Product code (ABC-123-XYZ) - Tests section-based patterns",
+        4 => "Date code (2024W15) - Tests From position filtering",
+        5 => "Binary input - Tests limited character set (0,1 only)",
+        6 => "Complex ID - Tests overlapping/conflicting rules",
+        7 => "Custom pattern - Tests advanced custom validation logic",
+        _ => "Unknown field",
+    };
+
+    let summary_text = if editor.validation_enabled {
+        format!(
+            "📊 Advanced Pattern Summary: {} fields with complex rules\n\
+             Current Field: {}\n\
+             ✅ Valid: {}  ⚠️  Warnings: {}  ❌ Errors: {}  📈 Progress: {:.0}%\n\
+             🎯 Pattern Focus: {}",
+            summary.total_fields,
+            editor.current_field() + 1,
+            summary.valid_fields,
+            summary.warning_fields,
+            summary.error_fields,
+            summary.completion_percentage() * 100.0,
+            field_info
+        )
+    } else {
+        "❌ Advanced pattern validation is DISABLED\nPress F1 to enable and see the magic!".to_string()
+    };
+
+    let summary_style = if summary.has_errors() {
+        Style::default().fg(Color::Red)
+    } else if summary.has_warnings() {
+        Style::default().fg(Color::Yellow)
+    } else {
+        Style::default().fg(Color::Green)
+    };
+
+    let validation_summary = Paragraph::new(summary_text)
+        .block(Block::default().borders(Borders::ALL).title("🎯 Advanced Pattern Analysis"))
+        .style(summary_style)
+        .wrap(Wrap { trim: true });
+
+    f.render_widget(validation_summary, chunks[1]);
+
+    // Enhanced help text
+    let help_text = match editor.mode() {
+        AppMode::ReadOnly => {
+            "🚀 ADVANCED PATTERN SHOWCASE - Each field demonstrates different edge cases!\n\
+             🕐 Time: Numeric+exact chars  🎨 Hex: OneOf with case-insensitive  🌐 IPv4: Complex positioning\n\
+             🏷️  Product: Multi-section rules  📅 Date: From-position filtering  🔢 Binary: Limited charset\n\
+             🎯 Complex: Overlapping rules  🚀 Custom: Advanced logic functions\n\
+             \n\
+             Movement: hjkl/arrows=move, Tab/Shift+Tab=fields, i/a=insert, F1=toggle, ?=info"
+        }
+        AppMode::Edit => {
+            "✏️  INSERT MODE - Testing advanced pattern validation!\n\
+             Each character is validated against complex rules in real-time\n\
+             Try entering invalid characters to see detailed error messages\n\
+             arrows=move, Backspace/Del=delete, Esc=normal, Tab=next field"
+        }
+        _ => "🚀 Advanced Pattern Validation Active!"
+    };
+
+    let help = Paragraph::new(help_text)
+        .block(Block::default().borders(Borders::ALL).title("🎯 Advanced Pattern Commands & Info"))
+        .style(Style::default().fg(Color::Gray))
+        .wrap(Wrap { trim: true });
+
+    f.render_widget(help, chunks[2]);
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    println!("🚀 Canvas Advanced Pattern Validation Demo");
+    println!("✅ validation feature: ENABLED");
+    println!("✅ gui feature: ENABLED");
+    println!("🎯 Advanced pattern filtering: ACTIVE");
+    println!("🧪 Edge cases and complex patterns: READY");
+    println!("💡 Each field showcases different validation capabilities!");
+    println!();
+
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    let data = AdvancedPatternData::new();
+    let editor = AdvancedPatternFormEditor::new(data);
+
+    let res = run_app(&mut terminal, editor);
+
+    disable_raw_mode()?;
+    execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    terminal.show_cursor()?;
+
+    if let Err(err) = res {
+        println!("{:?}", err);
+    }
+
+    println!("🚀 Advanced pattern validation demo completed!");
+    println!("🎯 Hope you enjoyed seeing all the edge cases in action!");
+    Ok(())
+}

canvas/examples/validation_3.rs

@@ -0,0 +1,712 @@
+// examples/validation_3.rs
+//! Comprehensive Display Mask Features Demo
+//!
+//! This example showcases the full power of the display mask system (Feature 3)
+//! demonstrating visual formatting that keeps business logic clean.
+//!
+//! Key Features Demonstrated:
+//! - Dynamic vs Template display modes
+//! - Custom patterns for different data types
+//! - Custom input characters and separators
+//! - Custom placeholder characters
+//! - Real-time visual formatting with clean raw data
+//! - Cursor movement through formatted displays
+//! - 🔥 CRITICAL: Perfect mask/character-limit coordination to prevent invisible character bugs
+//!
+//! ⚠️  IMPORTANT BUG PREVENTION:
+//! This example demonstrates the CORRECT way to configure masks with character limits.
+//! Each mask's input position count EXACTLY matches its character limit to prevent
+//! the critical bug where users can type more characters than they can see.
+//!
+//! Run with: cargo run --example validation_3 --features "gui,validation"
+
+// REQUIRE validation and gui features for mask functionality
+#[cfg(not(all(feature = "validation", feature = "gui")))]
+compile_error!(
+    "This example requires the 'validation' and 'gui' features. \
+     Run with: cargo run --example validation_3 --features \"gui,validation\""
+);
+
+use std::io;
+use crossterm::{
+    event::{
+        self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyModifiers,
+    },
+    execute,
+    terminal::{
+        disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
+    },
+};
+use ratatui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout, Rect},
+    style::{Color, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph, Wrap},
+    Frame, Terminal,
+};
+
+use canvas::{
+    canvas::{
+        gui::render_canvas_default,
+        modes::AppMode,
+    },
+    DataProvider, FormEditor,
+    ValidationConfig, ValidationConfigBuilder, DisplayMask,
+    validation::mask::MaskDisplayMode,
+};
+
+// Enhanced FormEditor wrapper for mask demonstration
+struct MaskDemoFormEditor<D: DataProvider> {
+    editor: FormEditor<D>,
+    debug_message: String,
+    command_buffer: String,
+    validation_enabled: bool,
+    show_raw_data: bool,
+}
+
+impl<D: DataProvider> MaskDemoFormEditor<D> {
+    fn new(data_provider: D) -> Self {
+        let mut editor = FormEditor::new(data_provider);
+        editor.set_validation_enabled(true);
+
+        Self {
+            editor,
+            debug_message: "🎭 Display Mask Demo - Visual formatting with clean business logic!".to_string(),
+            command_buffer: String::new(),
+            validation_enabled: true,
+            show_raw_data: false,
+        }
+    }
+
+    // === COMMAND BUFFER HANDLING ===
+    fn clear_command_buffer(&mut self) { self.command_buffer.clear(); }
+    fn add_to_command_buffer(&mut self, ch: char) { self.command_buffer.push(ch); }
+    fn get_command_buffer(&self) -> &str { &self.command_buffer }
+    fn has_pending_command(&self) -> bool { !self.command_buffer.is_empty() }
+
+    // === MASK CONTROL ===
+    fn toggle_validation(&mut self) {
+        self.validation_enabled = !self.validation_enabled;
+        self.editor.set_validation_enabled(self.validation_enabled);
+        if self.validation_enabled {
+            self.debug_message = "✅ Display Masks ENABLED - See visual formatting in action!".to_string();
+        } else {
+            self.debug_message = "❌ Display Masks DISABLED - Raw text only".to_string();
+        }
+    }
+
+    fn toggle_raw_data_view(&mut self) {
+        self.show_raw_data = !self.show_raw_data;
+        if self.show_raw_data {
+            self.debug_message = "👁️ Showing RAW business data (what's actually stored)".to_string();
+        } else {
+            self.debug_message = "🎭 Showing FORMATTED display (what users see)".to_string();
+        }
+    }
+
+    fn get_current_field_info(&self) -> (String, String, String) {
+        let field_index = self.editor.current_field();
+        let raw_data = self.editor.current_text();
+        let display_data = if self.validation_enabled {
+            self.editor.current_display_text()
+        } else {
+            raw_data.to_string()
+        };
+
+        let mask_info = if let Some(config) = self.editor.validation_state().get_field_config(field_index) {
+            if let Some(mask) = &config.display_mask {
+                format!("Pattern: '{}', Mode: {:?}", 
+                       mask.pattern(), 
+                       mask.display_mode())
+            } else {
+                "No mask configured".to_string()
+            }
+        } else {
+            "No validation config".to_string()
+        };
+
+        (raw_data.to_string(), display_data, mask_info)
+    }
+
+    // === ENHANCED MOVEMENT WITH MASK AWARENESS ===
+    fn move_left(&mut self) { 
+        self.editor.move_left(); 
+        self.update_cursor_info();
+    }
+
+    fn move_right(&mut self) { 
+        self.editor.move_right(); 
+        self.update_cursor_info();
+    }
+
+    fn move_up(&mut self) {
+        match self.editor.move_up() {
+            Ok(()) => { self.update_field_info(); }
+            Err(e) => { self.debug_message = format!("🚫 Field switch blocked: {}", e); }
+        }
+    }
+
+    fn move_down(&mut self) {
+        match self.editor.move_down() {
+            Ok(()) => { self.update_field_info(); }
+            Err(e) => { self.debug_message = format!("🚫 Field switch blocked: {}", e); }
+        }
+    }
+
+    fn move_line_start(&mut self) { 
+        self.editor.move_line_start(); 
+        self.update_cursor_info();
+    }
+
+    fn move_line_end(&mut self) { 
+        self.editor.move_line_end(); 
+        self.update_cursor_info();
+    }
+
+    fn update_cursor_info(&mut self) {
+        if self.validation_enabled {
+            let raw_pos = self.editor.cursor_position();
+            let display_pos = self.editor.display_cursor_position();
+            if raw_pos != display_pos {
+                self.debug_message = format!("📍 Cursor: Raw pos {} → Display pos {} (mask active)", raw_pos, display_pos);
+            } else {
+                self.debug_message = format!("📍 Cursor at position {} (no mask offset)", raw_pos);
+            }
+        }
+    }
+
+    fn update_field_info(&mut self) {
+        let field_name = self.editor.data_provider().field_name(self.editor.current_field());
+        self.debug_message = format!("📝 Switched to: {}", field_name);
+    }
+
+    // === MODE TRANSITIONS ===
+    fn enter_edit_mode(&mut self) {
+        self.editor.enter_edit_mode();
+        self.debug_message = "✏️ INSERT MODE - Type to see mask formatting in real-time".to_string();
+    }
+
+    fn enter_append_mode(&mut self) {
+        self.editor.enter_append_mode();
+        self.debug_message = "✏️ INSERT (append) - Mask formatting active".to_string();
+    }
+
+    fn exit_edit_mode(&mut self) {
+        self.editor.exit_edit_mode();
+        self.debug_message = "🔒 NORMAL MODE - Press 'r' to see raw data, 'm' for mask info".to_string();
+    }
+
+    fn insert_char(&mut self, ch: char) -> anyhow::Result<()> {
+        let result = self.editor.insert_char(ch);
+        if result.is_ok() {
+            let (raw, display, _) = self.get_current_field_info();
+            if raw != display {
+                self.debug_message = format!("✏️ Added '{}': Raw='{}' Display='{}'", ch, raw, display);
+            } else {
+                self.debug_message = format!("✏️ Added '{}': '{}'", ch, raw);
+            }
+        }
+        Ok(result?)
+    }
+
+    // === DELETE OPERATIONS ===
+    fn delete_backward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_backward();
+        if result.is_ok() {
+            self.debug_message = "⌫ Character deleted".to_string();
+            self.update_cursor_info();
+        }
+        Ok(result?)
+    }
+
+    fn delete_forward(&mut self) -> anyhow::Result<()> {
+        let result = self.editor.delete_forward();
+        if result.is_ok() {
+            self.debug_message = "⌦ Character deleted".to_string();
+            self.update_cursor_info();
+        }
+        Ok(result?)
+    }
+
+    // === DELEGATE TO ORIGINAL EDITOR ===
+    fn current_field(&self) -> usize { self.editor.current_field() }
+    fn cursor_position(&self) -> usize { self.editor.cursor_position() }
+    fn mode(&self) -> AppMode { self.editor.mode() }
+    fn current_text(&self) -> &str { self.editor.current_text() }
+    fn data_provider(&self) -> &D { self.editor.data_provider() }
+    fn ui_state(&self) -> &canvas::EditorState { self.editor.ui_state() }
+    fn set_mode(&mut self, mode: AppMode) { self.editor.set_mode(mode); }
+
+    fn next_field(&mut self) {
+        match self.editor.next_field() {
+            Ok(()) => { self.update_field_info(); }
+            Err(e) => { self.debug_message = format!("🚫 Cannot move to next field: {}", e); }
+        }
+    }
+
+    fn prev_field(&mut self) {
+        match self.editor.prev_field() {
+            Ok(()) => { self.update_field_info(); }
+            Err(e) => { self.debug_message = format!("🚫 Cannot move to previous field: {}", e); }
+        }
+    }
+
+    // === STATUS AND DEBUG ===
+    fn set_debug_message(&mut self, msg: String) { self.debug_message = msg; }
+    fn debug_message(&self) -> &str { &self.debug_message }
+
+    fn show_mask_details(&mut self) {
+        let (raw, display, mask_info) = self.get_current_field_info();
+        self.debug_message = format!("🔍 Field {}: {} | Raw: '{}' Display: '{}'", 
+                                   self.current_field() + 1, mask_info, raw, display);
+    }
+
+    fn get_mask_status(&self) -> String {
+        if !self.validation_enabled {
+            return "❌ DISABLED".to_string();
+        }
+
+        let field_count = self.editor.data_provider().field_count();
+        let mut mask_count = 0;
+        for i in 0..field_count {
+            if let Some(config) = self.editor.validation_state().get_field_config(i) {
+                if config.display_mask.is_some() {
+                    mask_count += 1;
+                }
+            }
+        }
+
+        format!("🎭 {} MASKS", mask_count)
+    }
+}
+
+// Demo data with comprehensive mask examples
+struct MaskDemoData {
+    fields: Vec<(String, String)>,
+}
+
+impl MaskDemoData {
+    fn new() -> Self {
+        Self {
+            fields: vec![
+                ("📞 Phone (Dynamic)".to_string(), "".to_string()),
+                ("📞 Phone (Template)".to_string(), "".to_string()),
+                ("📅 Date US (MM/DD/YYYY)".to_string(), "".to_string()),
+                ("📅 Date EU (DD.MM.YYYY)".to_string(), "".to_string()),
+                ("📅 Date ISO (YYYY-MM-DD)".to_string(), "".to_string()),
+                ("🏛️ SSN (XXX-XX-XXXX)".to_string(), "".to_string()),
+                ("💳 Credit Card".to_string(), "".to_string()),
+                ("🏢 Employee ID (EMP-####)".to_string(), "".to_string()),
+                ("📦 Product Code (ABC###XYZ)".to_string(), "".to_string()),
+                ("🌈 Custom Separators".to_string(), "".to_string()),
+                ("⭐ Custom Placeholders".to_string(), "".to_string()),
+                ("🎯 Mixed Input Chars".to_string(), "".to_string()),
+            ],
+        }
+    }
+}
+
+impl DataProvider for MaskDemoData {
+    fn field_count(&self) -> usize { self.fields.len() }
+    fn field_name(&self, index: usize) -> &str { &self.fields[index].0 }
+    fn field_value(&self, index: usize) -> &str { &self.fields[index].1 }
+    fn set_field_value(&mut self, index: usize, value: String) { self.fields[index].1 = value; }
+
+    fn validation_config(&self, field_index: usize) -> Option<ValidationConfig> {
+        match field_index {
+            0 => {
+                // 📞 Phone (Dynamic) - FIXED: Perfect mask/limit coordination
+                let phone_mask = DisplayMask::new("(###) ###-####", '#');
+                Some(ValidationConfigBuilder::new()
+                    .with_display_mask(phone_mask)
+                    .with_max_length(10)  // ✅ CRITICAL: Exactly matches 10 input positions
+                    .build())
+            }
+            1 => {
+                // 📞 Phone (Template) - FIXED: Perfect mask/limit coordination  
+                let phone_template = DisplayMask::new("(###) ###-####", '#')
+                    .with_template('_');
+                Some(ValidationConfigBuilder::new()
+                    .with_display_mask(phone_template)  
+                    .with_max_length(10)  // ✅ CRITICAL: Exactly matches 10 input positions
+                    .build())
+            }
+            2 => {
+                // 📅 Date US (MM/DD/YYYY) - American date format
+                let us_date = DisplayMask::new("##/##/####", '#');
+                Some(ValidationConfig::with_mask(us_date))
+            }
+            3 => {
+                // 📅 Date EU (DD.MM.YYYY) - European date format with dots
+                let eu_date = DisplayMask::new("##.##.####", '#')
+                    .with_template('•');
+                Some(ValidationConfig::with_mask(eu_date))
+            }
+            4 => {
+                // 📅 Date ISO (YYYY-MM-DD) - ISO date format
+                let iso_date = DisplayMask::new("####-##-##", '#')
+                    .with_template('-');
+                Some(ValidationConfig::with_mask(iso_date))
+            }
+            5 => {
+                // 🏛️ SSN using custom input character 'X' - FIXED: Perfect coordination
+                let ssn_mask = DisplayMask::new("XXX-XX-XXXX", 'X');
+                Some(ValidationConfigBuilder::new()
+                    .with_display_mask(ssn_mask)
+                    .with_max_length(9)  // ✅ CRITICAL: Exactly matches 9 input positions  
+                    .build())
+            }
+            6 => {
+                // 💳 Credit Card (16 digits with spaces) - FIXED: Perfect coordination
+                let cc_mask = DisplayMask::new("#### #### #### ####", '#')
+                    .with_template('•');
+                Some(ValidationConfigBuilder::new()
+                    .with_display_mask(cc_mask)
+                    .with_max_length(16)  // ✅ CRITICAL: Exactly matches 16 input positions
+                    .build())
+            }
+            7 => {
+                // 🏢 Employee ID with business prefix
+                let emp_id = DisplayMask::new("EMP-####", '#');
+                Some(ValidationConfig::with_mask(emp_id))
+            }
+            8 => {
+                // 📦 Product Code with mixed letters and numbers
+                let product_code = DisplayMask::new("ABC###XYZ", '#');
+                Some(ValidationConfig::with_mask(product_code))
+            }
+            9 => {
+                // 🌈 Custom Separators - Using | and ~ as separators
+                let custom_sep = DisplayMask::new("##|##~####", '#')
+                    .with_template('?');
+                Some(ValidationConfig::with_mask(custom_sep))
+            }
+            10 => {
+                // ⭐ Custom Placeholders - Using different placeholder characters
+                let custom_placeholder = DisplayMask::new("##-##-##", '#')
+                    .with_template('★');
+                Some(ValidationConfig::with_mask(custom_placeholder))
+            }
+            11 => {
+                // 🎯 Mixed Input Characters - Using 'N' for numbers
+                let mixed_input = DisplayMask::new("ID:NNN-NNN", 'N');
+                Some(ValidationConfig::with_mask(mixed_input))
+            }
+            _ => None,
+        }
+    }
+}
+
+// Enhanced key handling with mask-specific commands
+fn handle_key_press(
+    key: KeyCode,
+    modifiers: KeyModifiers,
+    editor: &mut MaskDemoFormEditor<MaskDemoData>,
+) -> anyhow::Result<bool> {
+    let mode = editor.mode();
+
+    // Quit handling
+    if (key == KeyCode::Char('q') && modifiers.contains(KeyModifiers::CONTROL))
+        || (key == KeyCode::Char('c') && modifiers.contains(KeyModifiers::CONTROL))
+        || key == KeyCode::F(10)
+    {
+        return Ok(false);
+    }
+
+    match (mode, key, modifiers) {
+        // === MODE TRANSITIONS ===
+        (AppMode::ReadOnly, KeyCode::Char('i'), _) => {
+            editor.enter_edit_mode();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('a'), _) => {
+            editor.enter_append_mode();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('A'), _) => {
+            editor.move_line_end();
+            editor.enter_edit_mode();
+            editor.clear_command_buffer();
+        }
+
+        // Escape: Exit edit mode
+        (_, KeyCode::Esc, _) => {
+            if mode == AppMode::Edit {
+                editor.exit_edit_mode();
+            } else {
+                editor.clear_command_buffer();
+            }
+        }
+
+        // === MASK SPECIFIC COMMANDS ===
+        (AppMode::ReadOnly, KeyCode::Char('m'), _) => {
+            editor.show_mask_details();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('r'), _) => {
+            editor.toggle_raw_data_view();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::F(1), _) => {
+            editor.toggle_validation();
+        }
+
+        // === MOVEMENT ===
+        (AppMode::ReadOnly, KeyCode::Char('h'), _) | (AppMode::ReadOnly, KeyCode::Left, _) => {
+            editor.move_left();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('l'), _) | (AppMode::ReadOnly, KeyCode::Right, _) => {
+            editor.move_right();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('j'), _) | (AppMode::ReadOnly, KeyCode::Down, _) => {
+            editor.move_down();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('k'), _) | (AppMode::ReadOnly, KeyCode::Up, _) => {
+            editor.move_up();
+            editor.clear_command_buffer();
+        }
+
+        // Line movement
+        (AppMode::ReadOnly, KeyCode::Char('0'), _) => {
+            editor.move_line_start();
+            editor.clear_command_buffer();
+        }
+        (AppMode::ReadOnly, KeyCode::Char('$'), _) => {
+            editor.move_line_end();
+            editor.clear_command_buffer();
+        }
+
+        // === EDIT MODE MOVEMENT ===
+        (AppMode::Edit, KeyCode::Left, _) => { editor.move_left(); }
+        (AppMode::Edit, KeyCode::Right, _) => { editor.move_right(); }
+        (AppMode::Edit, KeyCode::Up, _) => { editor.move_up(); }
+        (AppMode::Edit, KeyCode::Down, _) => { editor.move_down(); }
+
+        // === DELETE OPERATIONS ===
+        (AppMode::Edit, KeyCode::Backspace, _) => { editor.delete_backward()?; }
+        (AppMode::Edit, KeyCode::Delete, _) => { editor.delete_forward()?; }
+
+        // === TAB NAVIGATION ===
+        (_, KeyCode::Tab, _) => { editor.next_field(); }
+        (_, KeyCode::BackTab, _) => { editor.prev_field(); }
+
+        // === CHARACTER INPUT ===
+        (AppMode::Edit, KeyCode::Char(c), m) if !m.contains(KeyModifiers::CONTROL) => {
+            editor.insert_char(c)?;
+        }
+
+        // === DEBUG/INFO COMMANDS ===
+        (AppMode::ReadOnly, KeyCode::Char('?'), _) => {
+            let (raw, display, mask_info) = editor.get_current_field_info();
+            editor.set_debug_message(format!(
+                "Field {}/{}, Cursor {}, {}, Raw: '{}', Display: '{}'",
+                editor.current_field() + 1,
+                editor.data_provider().field_count(),
+                editor.cursor_position(),
+                mask_info,
+                raw,
+                display
+            ));
+        }
+
+        _ => {
+            if editor.has_pending_command() {
+                editor.clear_command_buffer();
+                editor.set_debug_message("Invalid command sequence".to_string());
+            }
+        }
+    }
+
+    Ok(true)
+}
+
+fn run_app<B: Backend>(
+    terminal: &mut Terminal<B>,
+    mut editor: MaskDemoFormEditor<MaskDemoData>,
+) -> io::Result<()> {
+    loop {
+        terminal.draw(|f| ui(f, &editor))?;
+
+        if let Event::Key(key) = event::read()? {
+            match handle_key_press(key.code, key.modifiers, &mut editor) {
+                Ok(should_continue) => {
+                    if !should_continue {
+                        break;
+                    }
+                }
+                Err(e) => {
+                    editor.set_debug_message(format!("Error: {}", e));
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn ui(f: &mut Frame, editor: &MaskDemoFormEditor<MaskDemoData>) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Constraint::Min(8), Constraint::Length(16)])
+        .split(f.area());
+
+    render_enhanced_canvas(f, chunks[0], editor);
+    render_mask_status(f, chunks[1], editor);
+}
+
+fn render_enhanced_canvas(
+    f: &mut Frame,
+    area: Rect,
+    editor: &MaskDemoFormEditor<MaskDemoData>,
+) {
+    render_canvas_default(f, area, &editor.editor);
+}
+
+fn render_mask_status(
+    f: &mut Frame,
+    area: Rect,
+    editor: &MaskDemoFormEditor<MaskDemoData>,
+) {
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Length(3), // Status bar
+            Constraint::Length(6), // Data comparison
+            Constraint::Length(7), // Help
+        ])
+        .split(area);
+
+    // Status bar with mask information
+    let mode_text = match editor.mode() {
+        AppMode::Edit => "INSERT",
+        AppMode::ReadOnly => "NORMAL",
+        _ => "OTHER",
+    };
+
+    let mask_status = editor.get_mask_status();
+    let status_text = format!("-- {} -- {} | Masks: {} | View: {}", 
+                             mode_text, 
+                             editor.debug_message(), 
+                             mask_status,
+                             if editor.show_raw_data { "RAW" } else { "FORMATTED" });
+
+    let status = Paragraph::new(Line::from(Span::raw(status_text)))
+        .block(Block::default().borders(Borders::ALL).title("🎭 Display Mask Demo"));
+
+    f.render_widget(status, chunks[0]);
+
+    // Data comparison showing raw vs display
+    let (raw_data, display_data, mask_info) = editor.get_current_field_info();
+    let field_name = editor.data_provider().field_name(editor.current_field());
+    
+    let comparison_text = format!(
+        "📝 Current Field: {}\n\
+         🔧 Mask Config: {}\n\
+         \n\
+         💾 Raw Business Data: '{}' ← What's actually stored in your database\n\
+         🎭 Formatted Display: '{}' ← What users see in the interface\n\
+         📍 Cursor: Raw pos {} → Display pos {}",
+        field_name,
+        mask_info,
+        raw_data,
+        display_data,
+        editor.cursor_position(),
+        editor.editor.display_cursor_position()
+    );
+
+    let comparison_style = if raw_data != display_data {
+        Style::default().fg(Color::Green) // Green when mask is active
+    } else {
+        Style::default().fg(Color::Gray) // Gray when no formatting
+    };
+
+    let data_comparison = Paragraph::new(comparison_text)
+        .block(Block::default().borders(Borders::ALL).title("📊 Raw Data vs Display Formatting"))
+        .style(comparison_style)
+        .wrap(Wrap { trim: true });
+
+    f.render_widget(data_comparison, chunks[1]);
+
+    // Enhanced help text
+    let help_text = match editor.mode() {
+        AppMode::ReadOnly => {
+            "🎭 MASK DEMO: See how visual formatting keeps business logic clean!\n\
+             \n\
+             📱 Try different fields to see various mask patterns:\n\
+             • Dynamic vs Template modes  • Custom separators  • Different input chars\n\
+             \n\
+             Commands: i/a=insert, m=mask details, r=toggle raw/display view\n\
+             Movement: hjkl/arrows=move, 0=$=line start/end, Tab=next field, F1=toggle masks\n\
+             ?=detailed info, Ctrl+C=quit"
+        }
+        AppMode::Edit => {
+            "✏️ INSERT MODE - Type to see real-time mask formatting!\n\
+             \n\
+             🔥 Key Features in Action:\n\
+             • Separators auto-appear as you type  • Cursor skips over separators\n\
+             • Template fields show placeholders  • Raw data stays clean for business logic\n\
+             \n\
+             arrows=move through mask, Backspace/Del=delete, Esc=normal, Tab=next field\n\
+             Notice how cursor position maps between raw data and display!"
+        }
+        _ => "🎭 Display Mask Demo Active!"
+    };
+
+    let help = Paragraph::new(help_text)
+        .block(Block::default().borders(Borders::ALL).title("🚀 Mask Features & Commands"))
+        .style(Style::default().fg(Color::Gray))
+        .wrap(Wrap { trim: true });
+
+    f.render_widget(help, chunks[2]);
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Print feature status
+    println!("🎭 Canvas Display Mask Demo (Feature 3)");
+    println!("✅ validation feature: ENABLED");
+    println!("✅ gui feature: ENABLED");
+    println!("🎭 Display masks: ACTIVE");
+    println!("🔥 Key Benefits Demonstrated:");
+    println!("   • Clean separation: Visual formatting ≠ Business logic");
+    println!("   • User-friendly: Pretty displays with automatic cursor handling");
+    println!("   • Flexible: Custom patterns, separators, and placeholders");
+    println!("   • Transparent: Library handles all complexity, API stays simple");
+    println!();
+    println!("💡 Try typing in different fields to see mask magic!");
+    println!("   📞 Phone fields show dynamic vs template modes");
+    println!("   📅 Date fields show different regional formats");
+    println!("   💳 Credit card shows spaced formatting");
+    println!("   ⭐ Custom fields show advanced separator/placeholder options");
+    println!();
+
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    let data = MaskDemoData::new();
+    let editor = MaskDemoFormEditor::new(data);
+
+    let res = run_app(&mut terminal, editor);
+
+    disable_raw_mode()?;
+    execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    terminal.show_cursor()?;
+
+    if let Err(err) = res {
+        println!("{:?}", err);
+    }
+
+    println!("🎭 Display mask demo completed!");
+    println!("🏆 You've seen how masks provide beautiful UX while keeping business logic clean!");
+    Ok(())
+}

canvas/src/autocomplete/actions.rs

@@ -1,128 +0,0 @@
-// src/autocomplete/actions.rs
-
-use crate::canvas::state::{CanvasState, ActionContext};
-use crate::autocomplete::state::AutocompleteCanvasState;
-use crate::canvas::actions::types::{CanvasAction, ActionResult};
-use crate::dispatcher::ActionDispatcher; // NEW: Use dispatcher directly
-use crate::config::CanvasConfig;
-use anyhow::Result;
-
-/// Version for states that implement rich autocomplete
-pub async fn execute_canvas_action_with_autocomplete<S: CanvasState + AutocompleteCanvasState>(
-    action: CanvasAction,
-    state: &mut S,
-    ideal_cursor_column: &mut usize,
-    config: Option<&CanvasConfig>,
-) -> Result<ActionResult> {
-    // 1. Try feature-specific handler first
-    let context = ActionContext {
-        key_code: None,
-        ideal_cursor_column: *ideal_cursor_column,
-        current_input: state.get_current_input().to_string(),
-        current_field: state.current_field(),
-    };
-
-    if let Some(result) = handle_rich_autocomplete_action(action.clone(), state, &context) {
-        return Ok(result);
-    }
-
-    // 2. Handle generic actions using the new dispatcher directly
-    let result = ActionDispatcher::dispatch_with_config(action.clone(), state, ideal_cursor_column, config).await?;
-
-    // 3. AUTO-TRIGGER LOGIC: Check if we should activate/deactivate autocomplete
-    if let Some(cfg) = config {
-        if cfg.should_auto_trigger_autocomplete() {
-            match action {
-                CanvasAction::InsertChar(_) => {
-                    let current_field = state.current_field();
-                    let current_input = state.get_current_input();
-
-                    if state.supports_autocomplete(current_field)
-                        && !state.is_autocomplete_active()
-                        && current_input.len() >= 1
-                    {
-                        state.activate_autocomplete();
-                    }
-                }
-
-                CanvasAction::NextField | CanvasAction::PrevField => {
-                    let current_field = state.current_field();
-
-                    if state.supports_autocomplete(current_field) && !state.is_autocomplete_active() {
-                        state.activate_autocomplete();
-                    } else if !state.supports_autocomplete(current_field) && state.is_autocomplete_active() {
-                        state.deactivate_autocomplete();
-                    }
-                }
-
-                _ => {} // No auto-trigger for other actions
-            }
-        }
-    }
-
-    Ok(result)
-}
-
-/// Handle rich autocomplete actions for AutocompleteCanvasState
-fn handle_rich_autocomplete_action<S: CanvasState + AutocompleteCanvasState>(
-    action: CanvasAction,
-    state: &mut S,
-    _context: &ActionContext,
-) -> Option<ActionResult> {
-    match action {
-        CanvasAction::TriggerAutocomplete => {
-            let current_field = state.current_field();
-            if state.supports_autocomplete(current_field) {
-                state.activate_autocomplete();
-                Some(ActionResult::success_with_message("Autocomplete activated"))
-            } else {
-                Some(ActionResult::success_with_message("Autocomplete not supported for this field"))
-            }
-        }
-
-        CanvasAction::SuggestionUp => {
-            if state.is_autocomplete_ready() {
-                if let Some(autocomplete_state) = state.autocomplete_state_mut() {
-                    autocomplete_state.select_previous();
-                }
-                Some(ActionResult::success())
-            } else {
-                Some(ActionResult::success_with_message("No suggestions available"))
-            }
-        }
-
-        CanvasAction::SuggestionDown => {
-            if state.is_autocomplete_ready() {
-                if let Some(autocomplete_state) = state.autocomplete_state_mut() {
-                    autocomplete_state.select_next();
-                }
-                Some(ActionResult::success())
-            } else {
-                Some(ActionResult::success_with_message("No suggestions available"))
-            }
-        }
-
-        CanvasAction::SelectSuggestion => {
-            if state.is_autocomplete_ready() {
-                if let Some(msg) = state.apply_autocomplete_selection() {
-                    Some(ActionResult::success_with_message(&msg))
-                } else {
-                    Some(ActionResult::success_with_message("No suggestion selected"))
-                }
-            } else {
-                Some(ActionResult::success_with_message("No suggestions available"))
-            }
-        }
-
-        CanvasAction::ExitSuggestions => {
-            if state.is_autocomplete_active() {
-                state.deactivate_autocomplete();
-                Some(ActionResult::success_with_message("Exited autocomplete"))
-            } else {
-                Some(ActionResult::success())
-            }
-        }
-
-        _ => None, // Not a rich autocomplete action
-    }
-}

canvas/src/autocomplete/gui.rs

@@ -1,38 +1,41 @@
-// canvas/src/autocomplete/gui.rs
+// src/autocomplete/gui.rs
+//! Autocomplete GUI updated to work with FormEditor
 
 #[cfg(feature = "gui")]
 use ratatui::{
     layout::{Alignment, Rect},
     style::{Modifier, Style},
-    widgets::{Block, Borders, List, ListItem, ListState, Paragraph},
+    widgets::{Block, List, ListItem, ListState, Paragraph},  // Removed Borders
     Frame,
 };
 
-use crate::autocomplete::types::AutocompleteState;
-
 #[cfg(feature = "gui")]
 use crate::canvas::theme::CanvasTheme;
+use crate::data_provider::{DataProvider, SuggestionItem};
+use crate::editor::FormEditor;
 
 #[cfg(feature = "gui")]
 use unicode_width::UnicodeWidthStr;
 
-/// Render autocomplete dropdown - call this AFTER rendering canvas
+/// Render autocomplete dropdown for FormEditor - call this AFTER rendering canvas
 #[cfg(feature = "gui")]
-pub fn render_autocomplete_dropdown<T: CanvasTheme>(
+pub fn render_autocomplete_dropdown<T: CanvasTheme, D: DataProvider>(
     f: &mut Frame,
     frame_area: Rect,
     input_rect: Rect,
     theme: &T,
-    autocomplete_state: &AutocompleteState<impl Clone + Send + 'static>,
+    editor: &FormEditor<D>,
 ) {
-    if !autocomplete_state.is_active {
+    let ui_state = editor.ui_state();
+
+    if !ui_state.is_autocomplete_active() {
         return;
     }
 
-    if autocomplete_state.is_loading {
+    if ui_state.autocomplete.is_loading {
         render_loading_indicator(f, frame_area, input_rect, theme);
-    } else if !autocomplete_state.suggestions.is_empty() {
+    } else if !editor.suggestions().is_empty() {
-        render_suggestions_dropdown(f, frame_area, input_rect, theme, autocomplete_state);
+        render_suggestions_dropdown(f, frame_area, input_rect, theme, editor.suggestions(), ui_state.autocomplete.selected_index);
     }
 }
 
@@ -73,9 +76,10 @@ fn render_suggestions_dropdown<T: CanvasTheme>(
     frame_area: Rect,
     input_rect: Rect,
     theme: &T,
-    autocomplete_state: &AutocompleteState<impl Clone + Send + 'static>,
+    suggestions: &[SuggestionItem],  // Fixed: Removed <String> generic parameter
+    selected_index: Option<usize>,
 ) {
-    let display_texts: Vec<&str> = autocomplete_state.suggestions
+    let display_texts: Vec<&str> = suggestions
         .iter()
         .map(|item| item.display_text.as_str())
         .collect();
@@ -95,19 +99,19 @@ fn render_suggestions_dropdown<T: CanvasTheme>(
     // List items
     let items = create_suggestion_list_items(
         &display_texts,
-        autocomplete_state.selected_index,
+        selected_index,
         dropdown_dimensions.width,
         theme,
     );
 
     let list = List::new(items).block(dropdown_block);
     let mut list_state = ListState::default();
-    list_state.select(autocomplete_state.selected_index);
+    list_state.select(selected_index);
 
     f.render_stateful_widget(list, dropdown_area, &mut list_state);
 }
 
-/// Calculate dropdown size based on suggestions - updated to match client dimensions
+/// Calculate dropdown size based on suggestions
 #[cfg(feature = "gui")]
 fn calculate_dropdown_dimensions(display_texts: &[&str]) -> DropdownDimensions {
     let max_width = display_texts
@@ -116,9 +120,9 @@ fn calculate_dropdown_dimensions(display_texts: &[&str]) -> DropdownDimensions {
         .max()
         .unwrap_or(0) as u16;
 
-    let horizontal_padding = 2; // Changed from 4 to 2 to match client
+    let horizontal_padding = 2;
-    let width = (max_width + horizontal_padding).max(10); // Changed from 12 to 10 to match client
+    let width = (max_width + horizontal_padding).max(10);
-    let height = (display_texts.len() as u16).min(5); // Removed +2 since no borders
+    let height = (display_texts.len() as u16).min(5);
 
     DropdownDimensions { width, height }
 }
@@ -151,7 +155,7 @@ fn calculate_dropdown_position(
     dropdown_area
 }
 
-/// Create styled list items - updated to match client spacing
+/// Create styled list items
 #[cfg(feature = "gui")]
 fn create_suggestion_list_items<'a, T: CanvasTheme>(
     display_texts: &'a [&'a str],
@@ -159,8 +163,7 @@ fn create_suggestion_list_items<'a, T: CanvasTheme>(
     dropdown_width: u16,
     theme: &T,
 ) -> Vec<ListItem<'a>> {
-    let horizontal_padding = 2; // Changed from 4 to 2 to match client
+    let available_width = dropdown_width;
-    let available_width = dropdown_width; // No border padding needed
 
     display_texts
         .iter()

canvas/src/autocomplete/mod.rs

@@ -1,10 +1,12 @@
 // src/autocomplete/mod.rs
-pub mod types;
-pub mod gui;
-pub mod state;
-pub mod actions;
 
-// Re-export autocomplete types
+pub mod state;
-pub use types::{SuggestionItem, AutocompleteState};
+#[cfg(feature = "gui")]
-pub use state::AutocompleteCanvasState;
+pub mod gui;
-pub use actions::execute_canvas_action_with_autocomplete;
+
+// Re-export the main autocomplete types
+pub use state::{AutocompleteProvider, SuggestionItem};
+
+// Re-export GUI functions if available
+#[cfg(feature = "gui")]
+pub use gui::render_autocomplete_dropdown;

canvas/src/autocomplete/state.rs

@@ -1,96 +1,5 @@
-// canvas/src/state.rs
+// src/autocomplete/state.rs
+//! Autocomplete provider types
 
-use crate::canvas::state::CanvasState;
+// Re-export the main types from data_provider
-
+pub use crate::data_provider::{AutocompleteProvider, SuggestionItem};
-/// OPTIONAL extension trait for states that want rich autocomplete functionality.
-/// Only implement this if you need the new autocomplete features.
-pub trait AutocompleteCanvasState: CanvasState {
-    /// Associated type for suggestion data (e.g., Hit, String, CustomType)
-    type SuggestionData: Clone + Send + 'static;
-
-    /// Check if a field supports autocomplete
-    fn supports_autocomplete(&self, _field_index: usize) -> bool {
-        false // Default: no autocomplete support
-    }
-
-    /// Get autocomplete state (read-only)
-    fn autocomplete_state(&self) -> Option<&crate::autocomplete::AutocompleteState<Self::SuggestionData>> {
-        None // Default: no autocomplete state
-    }
-
-    /// Get autocomplete state (mutable)
-    fn autocomplete_state_mut(&mut self) -> Option<&mut crate::autocomplete::AutocompleteState<Self::SuggestionData>> {
-        None // Default: no autocomplete state
-    }
-
-    /// CLIENT API: Activate autocomplete for current field
-    fn activate_autocomplete(&mut self) {
-        let current_field = self.current_field(); // Get field first
-        if let Some(state) = self.autocomplete_state_mut() {
-            state.activate(current_field); // Then use it
-        }
-    }
-
-    /// CLIENT API: Deactivate autocomplete
-    fn deactivate_autocomplete(&mut self) {
-        if let Some(state) = self.autocomplete_state_mut() {
-            state.deactivate();
-        }
-    }
-
-    /// CLIENT API: Set suggestions (called after async fetch completes)
-    fn set_autocomplete_suggestions(&mut self, suggestions: Vec<crate::autocomplete::SuggestionItem<Self::SuggestionData>>) {
-        if let Some(state) = self.autocomplete_state_mut() {
-            state.set_suggestions(suggestions);
-        }
-    }
-
-    /// CLIENT API: Set loading state
-    fn set_autocomplete_loading(&mut self, loading: bool) {
-        if let Some(state) = self.autocomplete_state_mut() {
-            state.is_loading = loading;
-        }
-    }
-
-    /// Check if autocomplete is currently active
-    fn is_autocomplete_active(&self) -> bool {
-        self.autocomplete_state()
-            .map(|state| state.is_active)
-            .unwrap_or(false)
-    }
-
-    /// Check if autocomplete is ready for interaction
-    fn is_autocomplete_ready(&self) -> bool {
-        self.autocomplete_state()
-            .map(|state| state.is_ready())
-            .unwrap_or(false)
-    }
-
-    /// INTERNAL: Apply selected autocomplete value to current field
-    fn apply_autocomplete_selection(&mut self) -> Option<String> {
-        // First, get the selected value and display text (if any)
-        let selection_info = if let Some(state) = self.autocomplete_state() {
-            state.get_selected().map(|selected| {
-                (selected.value_to_store.clone(), selected.display_text.clone())
-            })
-        } else {
-            None
-        };
-
-        // Apply the selection if we have one
-        if let Some((value, display)) = selection_info {
-            // Apply the value to current field
-            *self.get_current_input_mut() = value;
-            self.set_has_unsaved_changes(true);
-
-            // Deactivate autocomplete
-            if let Some(state_mut) = self.autocomplete_state_mut() {
-                state_mut.deactivate();
-            }
-
-            Some(format!("Selected: {}", display))
-        } else {
-            None
-        }
-    }
-}

canvas/src/autocomplete/types.rs

@@ -1,126 +0,0 @@
-// canvas/src/autocomplete.rs
-
-/// Generic suggestion item that clients push to canvas
-#[derive(Debug, Clone)]
-pub struct SuggestionItem<T> {
-    /// The underlying data (client-specific, e.g., Hit, String, etc.)
-    pub data: T,
-    /// Text to display in the dropdown
-    pub display_text: String,
-    /// Value to store in the form field when selected
-    pub value_to_store: String,
-}
-
-impl<T> SuggestionItem<T> {
-    pub fn new(data: T, display_text: String, value_to_store: String) -> Self {
-        Self {
-            data,
-            display_text,
-            value_to_store,
-        }
-    }
-    
-    /// Convenience constructor for simple string suggestions
-    pub fn simple(data: T, text: String) -> Self {
-        Self {
-            data,
-            display_text: text.clone(),
-            value_to_store: text,
-        }
-    }
-}
-
-/// Autocomplete state managed by canvas
-#[derive(Debug, Clone)]
-pub struct AutocompleteState<T> {
-    /// Whether autocomplete is currently active/visible
-    pub is_active: bool,
-    /// Whether suggestions are being loaded (for spinner/loading indicator)
-    pub is_loading: bool,
-    /// Current suggestions to display
-    pub suggestions: Vec<SuggestionItem<T>>,
-    /// Currently selected suggestion index
-    pub selected_index: Option<usize>,
-    /// Field index that triggered autocomplete (for context)
-    pub active_field: Option<usize>,
-}
-
-impl<T> Default for AutocompleteState<T> {
-    fn default() -> Self {
-        Self {
-            is_active: false,
-            is_loading: false,
-            suggestions: Vec::new(),
-            selected_index: None,
-            active_field: None,
-        }
-    }
-}
-
-impl<T> AutocompleteState<T> {
-    pub fn new() -> Self {
-        Self::default()
-    }
-    
-    /// Activate autocomplete for a specific field
-    pub fn activate(&mut self, field_index: usize) {
-        self.is_active = true;
-        self.active_field = Some(field_index);
-        self.selected_index = None;
-        self.suggestions.clear();
-        self.is_loading = true;
-    }
-    
-    /// Deactivate autocomplete and clear state
-    pub fn deactivate(&mut self) {
-        self.is_active = false;
-        self.is_loading = false;
-        self.suggestions.clear();
-        self.selected_index = None;
-        self.active_field = None;
-    }
-    
-    /// Set suggestions and stop loading
-    pub fn set_suggestions(&mut self, suggestions: Vec<SuggestionItem<T>>) {
-        self.suggestions = suggestions;
-        self.is_loading = false;
-        self.selected_index = if self.suggestions.is_empty() { 
-            None 
-        } else { 
-            Some(0) 
-        };
-    }
-    
-    /// Move selection down
-    pub fn select_next(&mut self) {
-        if !self.suggestions.is_empty() {
-            let current = self.selected_index.unwrap_or(0);
-            self.selected_index = Some((current + 1) % self.suggestions.len());
-        }
-    }
-    
-    /// Move selection up
-    pub fn select_previous(&mut self) {
-        if !self.suggestions.is_empty() {
-            let current = self.selected_index.unwrap_or(0);
-            self.selected_index = Some(
-                if current == 0 { 
-                    self.suggestions.len() - 1 
-                } else { 
-                    current - 1 
-                }
-            );
-        }
-    }
-    
-    /// Get currently selected suggestion
-    pub fn get_selected(&self) -> Option<&SuggestionItem<T>> {
-        self.selected_index
-            .and_then(|idx| self.suggestions.get(idx))
-    }
-    
-    /// Check if autocomplete is ready for interaction (active and has suggestions)
-    pub fn is_ready(&self) -> bool {
-        self.is_active && !self.suggestions.is_empty() && !self.is_loading
-    }
-}

canvas/src/canvas/actions/handlers/edit.rs

@@ -1,376 +0,0 @@
-// src/canvas/actions/handlers/edit.rs
-//! Edit mode action handler
-//! 
-//! Handles user input when in edit mode, supporting text entry, deletion,
-//! and cursor movement with edit-specific behavior (cursor can go past end of text).
-
-use crate::canvas::actions::types::{CanvasAction, ActionResult};
-use crate::config::introspection::{ActionHandlerIntrospection, HandlerCapabilities, ActionSpec};
-use crate::canvas::actions::movement::*;
-use crate::canvas::state::CanvasState;
-use crate::config::CanvasConfig;
-use anyhow::Result;
-
-/// Edit mode uses cursor-past-end behavior for text insertion
-const FOR_EDIT_MODE: bool = true;
-
-/// Empty struct that implements edit mode capabilities
-pub struct EditHandler;
-
-/// Handle actions in edit mode with edit-specific cursor behavior
-/// 
-/// Edit mode allows text modification and uses cursor positioning that can
-/// go past the end of existing text to facilitate insertion.
-/// 
-/// # Arguments
-/// * `action` - The action to perform
-/// * `state` - Mutable canvas state
-/// * `ideal_cursor_column` - Desired column for vertical movement (maintained across line changes)
-/// * `config` - Optional configuration for behavior customization
-pub async fn handle_edit_action<S: CanvasState>(
-    action: CanvasAction,
-    state: &mut S,
-    ideal_cursor_column: &mut usize,
-    config: Option<&CanvasConfig>,
-) -> Result<ActionResult> {
-    match action {
-        CanvasAction::InsertChar(c) => {
-            // Insert character at cursor position and advance cursor
-            let cursor_pos = state.current_cursor_pos();
-            let input = state.get_current_input_mut();
-            input.insert(cursor_pos, c);
-            state.set_current_cursor_pos(cursor_pos + 1);
-            state.set_has_unsaved_changes(true);
-            *ideal_cursor_column = cursor_pos + 1;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::DeleteBackward => {
-            // Delete character before cursor (Backspace behavior)
-            let cursor_pos = state.current_cursor_pos();
-            if cursor_pos > 0 {
-                let input = state.get_current_input_mut();
-                input.remove(cursor_pos - 1);
-                state.set_current_cursor_pos(cursor_pos - 1);
-                state.set_has_unsaved_changes(true);
-                *ideal_cursor_column = cursor_pos - 1;
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::DeleteForward => {
-            // Delete character at cursor position (Delete key behavior)
-            let cursor_pos = state.current_cursor_pos();
-            let input = state.get_current_input_mut();
-            if cursor_pos < input.len() {
-                input.remove(cursor_pos);
-                state.set_has_unsaved_changes(true);
-            }
-            Ok(ActionResult::success())
-        }
-
-        // Cursor movement actions
-        CanvasAction::MoveLeft => {
-            let new_pos = move_left(state.current_cursor_pos());
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveRight => {
-            let current_input = state.get_current_input();
-            let current_pos = state.current_cursor_pos();
-            let new_pos = move_right(current_pos, current_input, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        // Field navigation (treating single-line fields as "lines")
-        CanvasAction::MoveUp => {
-            let current_field = state.current_field();
-            if current_field > 0 {
-                state.set_current_field(current_field - 1);
-                let current_input = state.get_current_input();
-                let new_pos = safe_cursor_position(current_input, *ideal_cursor_column, FOR_EDIT_MODE);
-                state.set_current_cursor_pos(new_pos);
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveDown => {
-            let current_field = state.current_field();
-            let total_fields = state.fields().len();
-            if current_field < total_fields - 1 {
-                state.set_current_field(current_field + 1);
-                let current_input = state.get_current_input();
-                let new_pos = safe_cursor_position(current_input, *ideal_cursor_column, FOR_EDIT_MODE);
-                state.set_current_cursor_pos(new_pos);
-            }
-            Ok(ActionResult::success())
-        }
-
-        // Line-based movement
-        CanvasAction::MoveLineStart => {
-            let new_pos = line_start_position();
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveLineEnd => {
-            let current_input = state.get_current_input();
-            let new_pos = line_end_position(current_input, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        // Document-level movement (first/last field)
-        CanvasAction::MoveFirstLine => {
-            state.set_current_field(0);
-            let current_input = state.get_current_input();
-            let new_pos = safe_cursor_position(current_input, 0, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveLastLine => {
-            let last_field = state.fields().len() - 1;
-            state.set_current_field(last_field);
-            let current_input = state.get_current_input();
-            let new_pos = line_end_position(current_input, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        // Word-based movement
-        CanvasAction::MoveWordNext => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_next_word_start(current_input, state.current_cursor_pos());
-                state.set_current_cursor_pos(new_pos);
-                *ideal_cursor_column = new_pos;
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordEnd => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_word_end(current_input, state.current_cursor_pos());
-                state.set_current_cursor_pos(new_pos);
-                *ideal_cursor_column = new_pos;
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordPrev => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_prev_word_start(current_input, state.current_cursor_pos());
-                state.set_current_cursor_pos(new_pos);
-                *ideal_cursor_column = new_pos;
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordEndPrev => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_prev_word_end(current_input, state.current_cursor_pos());
-                state.set_current_cursor_pos(new_pos);
-                *ideal_cursor_column = new_pos;
-            }
-            Ok(ActionResult::success())
-        }
-
-        // Field navigation with wrapping behavior
-        CanvasAction::NextField | CanvasAction::PrevField => {
-            let current_field = state.current_field();
-            let total_fields = state.fields().len();
-
-            let new_field = match action {
-                CanvasAction::NextField => {
-                    if config.map_or(true, |c| c.behavior.wrap_around_fields) {
-                        (current_field + 1) % total_fields // Wrap to first field
-                    } else {
-                        (current_field + 1).min(total_fields - 1) // Stop at last field
-                    }
-                }
-                CanvasAction::PrevField => {
-                    if config.map_or(true, |c| c.behavior.wrap_around_fields) {
-                        if current_field == 0 { total_fields - 1 } else { current_field - 1 } // Wrap to last field
-                    } else {
-                        current_field.saturating_sub(1) // Stop at first field
-                    }
-                }
-                _ => unreachable!(),
-            };
-
-            state.set_current_field(new_field);
-            let current_input = state.get_current_input();
-            let new_pos = safe_cursor_position(current_input, *ideal_cursor_column, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::Custom(action_str) => {
-            Ok(ActionResult::success_with_message(&format!("Custom edit action: {}", action_str)))
-        }
-
-        _ => {
-            Ok(ActionResult::success_with_message("Action not implemented for edit mode"))
-        }
-    }
-}
-
-impl ActionHandlerIntrospection for EditHandler {
-    /// Report all actions this handler supports with examples and requirements
-    /// Used for automatic config generation and validation
-    fn introspect() -> HandlerCapabilities {
-        let mut actions = Vec::new();
-
-        // REQUIRED ACTIONS - These must be configured for edit mode to work properly
-        actions.push(ActionSpec {
-            name: "move_left".to_string(),
-            description: "Move cursor one position to the left".to_string(),
-            examples: vec!["Left".to_string(), "h".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_right".to_string(),
-            description: "Move cursor one position to the right".to_string(),
-            examples: vec!["Right".to_string(), "l".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_up".to_string(),
-            description: "Move to previous field or line".to_string(),
-            examples: vec!["Up".to_string(), "k".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_down".to_string(),
-            description: "Move to next field or line".to_string(),
-            examples: vec!["Down".to_string(), "j".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "delete_char_backward".to_string(),
-            description: "Delete character before cursor (Backspace)".to_string(),
-            examples: vec!["Backspace".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "next_field".to_string(),
-            description: "Move to next input field".to_string(),
-            examples: vec!["Tab".to_string(), "Enter".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "prev_field".to_string(),
-            description: "Move to previous input field".to_string(),
-            examples: vec!["Shift+Tab".to_string()],
-            is_required: true,
-        });
-
-        // OPTIONAL ACTIONS - These enhance functionality but aren't required
-        actions.push(ActionSpec {
-            name: "move_word_next".to_string(),
-            description: "Move cursor to start of next word".to_string(),
-            examples: vec!["Ctrl+Right".to_string(), "w".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_word_prev".to_string(),
-            description: "Move cursor to start of previous word".to_string(),
-            examples: vec!["Ctrl+Left".to_string(), "b".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_word_end".to_string(),
-            description: "Move cursor to end of current/next word".to_string(),
-            examples: vec!["e".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_word_end_prev".to_string(),
-            description: "Move cursor to end of previous word".to_string(),
-            examples: vec!["ge".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_line_start".to_string(),
-            description: "Move cursor to beginning of line".to_string(),
-            examples: vec!["Home".to_string(), "0".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_line_end".to_string(),
-            description: "Move cursor to end of line".to_string(),
-            examples: vec!["End".to_string(), "$".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_first_line".to_string(),
-            description: "Move to first field".to_string(),
-            examples: vec!["Ctrl+Home".to_string(), "gg".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_last_line".to_string(),
-            description: "Move to last field".to_string(),
-            examples: vec!["Ctrl+End".to_string(), "G".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "delete_char_forward".to_string(),
-            description: "Delete character after cursor (Delete key)".to_string(),
-            examples: vec!["Delete".to_string()],
-            is_required: false,
-        });
-
-        HandlerCapabilities {
-            mode_name: "edit".to_string(),
-            actions,
-            auto_handled: vec![
-                "insert_char".to_string(), // Any printable character is inserted automatically
-            ],
-        }
-    }
-
-    fn validate_capabilities() -> Result<(), String> {
-        // TODO: Could add runtime validation that the handler actually
-        // implements all the actions it claims to support
-
-        // For now, just validate that we have the essential actions
-        let caps = Self::introspect();
-        let required_count = caps.actions.iter().filter(|a| a.is_required).count();
-
-        if required_count < 7 { // We expect at least 7 required actions
-            return Err(format!(
-                "Edit handler claims only {} required actions, expected at least 7",
-                required_count
-            ));
-        }
-
-        Ok(())
-    }
-}

canvas/src/canvas/actions/handlers/highlight.rs

@@ -1,205 +0,0 @@
-// src/canvas/actions/handlers/highlight.rs
-
-use crate::canvas::actions::types::{CanvasAction, ActionResult};
-use crate::config::introspection::{ActionHandlerIntrospection, HandlerCapabilities, ActionSpec};
-
-use crate::canvas::actions::movement::*;
-use crate::canvas::state::CanvasState;
-use crate::config::CanvasConfig;
-use anyhow::Result;
-
-const FOR_EDIT_MODE: bool = false; // Highlight mode uses read-only cursor behavior
-                                   
-pub struct HighlightHandler;
-
-/// Handle actions in highlight/visual mode
-/// TODO: Implement selection logic and highlight-specific behaviors
-pub async fn handle_highlight_action<S: CanvasState>(
-    action: CanvasAction,
-    state: &mut S,
-    ideal_cursor_column: &mut usize,
-    config: Option<&CanvasConfig>,
-) -> Result<ActionResult> {
-    match action {
-        // Movement actions work similar to read-only mode but with selection
-        CanvasAction::MoveLeft => {
-            let new_pos = move_left(state.current_cursor_pos());
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            // TODO: Update selection range
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveRight => {
-            let current_input = state.get_current_input();
-            let current_pos = state.current_cursor_pos();
-            let new_pos = move_right(current_pos, current_input, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            // TODO: Update selection range
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordNext => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_next_word_start(current_input, state.current_cursor_pos());
-                let final_pos = clamp_cursor_position(new_pos, current_input, FOR_EDIT_MODE);
-                state.set_current_cursor_pos(final_pos);
-                *ideal_cursor_column = final_pos;
-                // TODO: Update selection range
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordEnd => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_word_end(current_input, state.current_cursor_pos());
-                let final_pos = clamp_cursor_position(new_pos, current_input, FOR_EDIT_MODE);
-                state.set_current_cursor_pos(final_pos);
-                *ideal_cursor_column = final_pos;
-                // TODO: Update selection range
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordPrev => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_prev_word_start(current_input, state.current_cursor_pos());
-                state.set_current_cursor_pos(new_pos);
-                *ideal_cursor_column = new_pos;
-                // TODO: Update selection range
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveLineStart => {
-            let new_pos = line_start_position();
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            // TODO: Update selection range
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveLineEnd => {
-            let current_input = state.get_current_input();
-            let new_pos = line_end_position(current_input, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            // TODO: Update selection range
-            Ok(ActionResult::success())
-        }
-
-        // Highlight mode doesn't handle editing actions
-        CanvasAction::InsertChar(_) | 
-        CanvasAction::DeleteBackward | 
-        CanvasAction::DeleteForward => {
-            Ok(ActionResult::success_with_message("Action not available in highlight mode"))
-        }
-
-        CanvasAction::Custom(action_str) => {
-            Ok(ActionResult::success_with_message(&format!("Custom highlight action: {}", action_str)))
-        }
-
-        _ => {
-            Ok(ActionResult::success_with_message("Action not implemented for highlight mode"))
-        }
-    }
-}
-
-impl ActionHandlerIntrospection for HighlightHandler {
-    fn introspect() -> HandlerCapabilities {
-        let mut actions = Vec::new();
-
-        // For now, highlight mode uses similar movement to readonly
-        // but this will be discovered from actual implementation
-
-        // REQUIRED ACTIONS - Basic movement in highlight mode
-        actions.push(ActionSpec {
-            name: "move_left".to_string(),
-            description: "Move cursor left and extend selection".to_string(),
-            examples: vec!["h".to_string(), "Left".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_right".to_string(),
-            description: "Move cursor right and extend selection".to_string(),
-            examples: vec!["l".to_string(), "Right".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_up".to_string(),
-            description: "Move up and extend selection".to_string(),
-            examples: vec!["k".to_string(), "Up".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_down".to_string(),
-            description: "Move down and extend selection".to_string(),
-            examples: vec!["j".to_string(), "Down".to_string()],
-            is_required: true,
-        });
-
-        // OPTIONAL ACTIONS - Advanced highlight movement
-        actions.push(ActionSpec {
-            name: "move_word_next".to_string(),
-            description: "Move to next word and extend selection".to_string(),
-            examples: vec!["w".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_word_end".to_string(),
-            description: "Move to word end and extend selection".to_string(),
-            examples: vec!["e".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_word_prev".to_string(),
-            description: "Move to previous word and extend selection".to_string(),
-            examples: vec!["b".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_line_start".to_string(),
-            description: "Move to line start and extend selection".to_string(),
-            examples: vec!["0".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_line_end".to_string(),
-            description: "Move to line end and extend selection".to_string(),
-            examples: vec!["$".to_string()],
-            is_required: false,
-        });
-
-        HandlerCapabilities {
-            mode_name: "highlight".to_string(),
-            actions,
-            auto_handled: vec![], // Highlight mode has no auto-handled actions
-        }
-    }
-
-    fn validate_capabilities() -> Result<(), String> {
-        let caps = Self::introspect();
-        let required_count = caps.actions.iter().filter(|a| a.is_required).count();
-
-        if required_count < 4 { // We expect at least 4 required actions (basic movement)
-            return Err(format!(
-                "Highlight handler claims only {} required actions, expected at least 4",
-                required_count
-            ));
-        }
-
-        Ok(())
-    }
-}
-

canvas/src/canvas/actions/handlers/mod.rs

@@ -1,10 +0,0 @@
-// src/canvas/actions/handlers/mod.rs
-
-pub mod edit;
-pub mod readonly;
-pub mod highlight;
-
-// Re-export handler functions
-pub use edit::handle_edit_action;
-pub use readonly::handle_readonly_action;
-pub use highlight::handle_highlight_action;

canvas/src/canvas/actions/handlers/readonly.rs

@@ -1,322 +0,0 @@
-// src/canvas/actions/handlers/readonly.rs
-
-use crate::canvas::actions::types::{CanvasAction, ActionResult};
-use crate::config::introspection::{ActionHandlerIntrospection, HandlerCapabilities, ActionSpec};
-use crate::canvas::actions::movement::*;
-use crate::canvas::state::CanvasState;
-use crate::config::CanvasConfig;
-use anyhow::Result;
-
-const FOR_EDIT_MODE: bool = false; // Read-only mode flag
-
-/// Handle actions in read-only mode with read-only specific cursor behavior
-pub async fn handle_readonly_action<S: CanvasState>(
-    action: CanvasAction,
-    state: &mut S,
-    ideal_cursor_column: &mut usize,
-    config: Option<&CanvasConfig>,
-) -> Result<ActionResult> {
-    match action {
-        CanvasAction::MoveLeft => {
-            let new_pos = move_left(state.current_cursor_pos());
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveRight => {
-            let current_input = state.get_current_input();
-            let current_pos = state.current_cursor_pos();
-            let new_pos = move_right(current_pos, current_input, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveUp => {
-            let current_field = state.current_field();
-            let new_field = current_field.saturating_sub(1);
-            state.set_current_field(new_field);
-            
-            // Apply ideal cursor column with read-only bounds
-            let current_input = state.get_current_input();
-            let new_pos = safe_cursor_position(current_input, *ideal_cursor_column, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveDown => {
-            let current_field = state.current_field();
-            let total_fields = state.fields().len();
-            if total_fields == 0 {
-                return Ok(ActionResult::success_with_message("No fields to navigate"));
-            }
-            
-            let new_field = (current_field + 1).min(total_fields - 1);
-            state.set_current_field(new_field);
-            
-            // Apply ideal cursor column with read-only bounds
-            let current_input = state.get_current_input();
-            let new_pos = safe_cursor_position(current_input, *ideal_cursor_column, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveFirstLine => {
-            let total_fields = state.fields().len();
-            if total_fields == 0 {
-                return Ok(ActionResult::success_with_message("No fields to navigate"));
-            }
-            
-            state.set_current_field(0);
-            let current_input = state.get_current_input();
-            let new_pos = safe_cursor_position(current_input, *ideal_cursor_column, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveLastLine => {
-            let total_fields = state.fields().len();
-            if total_fields == 0 {
-                return Ok(ActionResult::success_with_message("No fields to navigate"));
-            }
-            
-            let last_field = total_fields - 1;
-            state.set_current_field(last_field);
-            let current_input = state.get_current_input();
-            let new_pos = safe_cursor_position(current_input, *ideal_cursor_column, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveLineStart => {
-            let new_pos = line_start_position();
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveLineEnd => {
-            let current_input = state.get_current_input();
-            let new_pos = line_end_position(current_input, FOR_EDIT_MODE);
-            state.set_current_cursor_pos(new_pos);
-            *ideal_cursor_column = new_pos;
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordNext => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_next_word_start(current_input, state.current_cursor_pos());
-                let final_pos = clamp_cursor_position(new_pos, current_input, FOR_EDIT_MODE);
-                state.set_current_cursor_pos(final_pos);
-                *ideal_cursor_column = final_pos;
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordEnd => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let current_pos = state.current_cursor_pos();
-                let new_pos = find_word_end(current_input, current_pos);
-                let final_pos = clamp_cursor_position(new_pos, current_input, FOR_EDIT_MODE);
-                state.set_current_cursor_pos(final_pos);
-                *ideal_cursor_column = final_pos;
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordPrev => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_prev_word_start(current_input, state.current_cursor_pos());
-                state.set_current_cursor_pos(new_pos);
-                *ideal_cursor_column = new_pos;
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::MoveWordEndPrev => {
-            let current_input = state.get_current_input();
-            if !current_input.is_empty() {
-                let new_pos = find_prev_word_end(current_input, state.current_cursor_pos());
-                state.set_current_cursor_pos(new_pos);
-                *ideal_cursor_column = new_pos;
-            }
-            Ok(ActionResult::success())
-        }
-
-        CanvasAction::NextField | CanvasAction::PrevField => {
-            let current_field = state.current_field();
-            let total_fields = state.fields().len();
-
-            let new_field = match action {
-                CanvasAction::NextField => {
-                    if config.map_or(true, |c| c.behavior.wrap_around_fields) {
-                        (current_field + 1) % total_fields
-                    } else {
-                        (current_field + 1).min(total_fields - 1)
-                    }
-                }
-                CanvasAction::PrevField => {
-                    if config.map_or(true, |c| c.behavior.wrap_around_fields) {
-                        if current_field == 0 { total_fields - 1 } else { current_field - 1 }
-                    } else {
-                        current_field.saturating_sub(1)
-                    }
-                }
-                _ => unreachable!(),
-            };
-
-            state.set_current_field(new_field);
-            *ideal_cursor_column = state.current_cursor_pos();
-            Ok(ActionResult::success())
-        }
-
-        // Read-only mode doesn't handle editing actions
-        CanvasAction::InsertChar(_) | 
-        CanvasAction::DeleteBackward | 
-        CanvasAction::DeleteForward => {
-            Ok(ActionResult::success_with_message("Action not available in read-only mode"))
-        }
-
-        CanvasAction::Custom(action_str) => {
-            Ok(ActionResult::success_with_message(&format!("Custom readonly action: {}", action_str)))
-        }
-
-        _ => {
-            Ok(ActionResult::success_with_message("Action not implemented for read-only mode"))
-        }
-    }
-}
-
-pub struct ReadOnlyHandler;
-
-impl ActionHandlerIntrospection for ReadOnlyHandler {
-    fn introspect() -> HandlerCapabilities {
-        let mut actions = Vec::new();
-
-        // REQUIRED ACTIONS - Navigation is essential in read-only mode
-        actions.push(ActionSpec {
-            name: "move_left".to_string(),
-            description: "Move cursor one position to the left".to_string(),
-            examples: vec!["h".to_string(), "Left".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_right".to_string(),
-            description: "Move cursor one position to the right".to_string(),
-            examples: vec!["l".to_string(), "Right".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_up".to_string(),
-            description: "Move to previous field".to_string(),
-            examples: vec!["k".to_string(), "Up".to_string()],
-            is_required: true,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_down".to_string(),
-            description: "Move to next field".to_string(),
-            examples: vec!["j".to_string(), "Down".to_string()],
-            is_required: true,
-        });
-
-        // OPTIONAL ACTIONS - Advanced navigation features
-        actions.push(ActionSpec {
-            name: "move_word_next".to_string(),
-            description: "Move cursor to start of next word".to_string(),
-            examples: vec!["w".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_word_prev".to_string(),
-            description: "Move cursor to start of previous word".to_string(),
-            examples: vec!["b".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_word_end".to_string(),
-            description: "Move cursor to end of current/next word".to_string(),
-            examples: vec!["e".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_word_end_prev".to_string(),
-            description: "Move cursor to end of previous word".to_string(),
-            examples: vec!["ge".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_line_start".to_string(),
-            description: "Move cursor to beginning of line".to_string(),
-            examples: vec!["0".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_line_end".to_string(),
-            description: "Move cursor to end of line".to_string(),
-            examples: vec!["$".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_first_line".to_string(),
-            description: "Move to first field".to_string(),
-            examples: vec!["gg".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "move_last_line".to_string(),
-            description: "Move to last field".to_string(),
-            examples: vec!["G".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "next_field".to_string(),
-            description: "Move to next input field".to_string(),
-            examples: vec!["Tab".to_string()],
-            is_required: false,
-        });
-
-        actions.push(ActionSpec {
-            name: "prev_field".to_string(),
-            description: "Move to previous input field".to_string(),
-            examples: vec!["Shift+Tab".to_string()],
-            is_required: false,
-        });
-
-        HandlerCapabilities {
-            mode_name: "read_only".to_string(),
-            actions,
-            auto_handled: vec![], // Read-only mode has no auto-handled actions
-        }
-    }
-
-    fn validate_capabilities() -> Result<(), String> {
-        let caps = Self::introspect();
-        let required_count = caps.actions.iter().filter(|a| a.is_required).count();
-
-        if required_count < 4 { // We expect at least 4 required actions (basic movement)
-            return Err(format!(
-                "ReadOnly handler claims only {} required actions, expected at least 4",
-                required_count
-            ));
-        }
-
-        Ok(())
-    }
-}

canvas/src/canvas/actions/mod.rs

@@ -2,7 +2,6 @@
 
 pub mod types;
 pub mod movement;
-pub mod handlers;
 
-// Re-export the main types
+// Re-export the main API
 pub use types::{CanvasAction, ActionResult};

canvas/src/canvas/actions/types.rs

@@ -1,35 +1,34 @@
 // src/canvas/actions/types.rs
 
+/// All available canvas actions
 #[derive(Debug, Clone, PartialEq)]
 pub enum CanvasAction {
-    // Character input
+    // Movement actions
-    InsertChar(char),
-
-    // Deletion
-    DeleteBackward,
-    DeleteForward,
-
-    // Basic cursor movement
     MoveLeft,
     MoveRight,
     MoveUp,
     MoveDown,
 
+    // Word movement
+    MoveWordNext,
+    MoveWordPrev,
+    MoveWordEnd,
+    MoveWordEndPrev,
+
     // Line movement
     MoveLineStart,
     MoveLineEnd,
+
+    // Field movement
+    NextField,
+    PrevField,
     MoveFirstLine,
     MoveLastLine,
 
-    // Word movement
+    // Editing actions
-    MoveWordNext,
+    InsertChar(char),
-    MoveWordEnd,
+    DeleteBackward,
-    MoveWordPrev,
+    DeleteForward,
-    MoveWordEndPrev,
-
-    // Field navigation
-    NextField,
-    PrevField,
 
     // Autocomplete actions
     TriggerAutocomplete,
@@ -42,67 +41,131 @@ pub enum CanvasAction {
     Custom(String),
 }
 
-impl CanvasAction {
+/// Result type for canvas actions
-    /// Convert string action name to CanvasAction enum (config-driven)
+#[derive(Debug, Clone)]
-    pub fn from_string(action: &str) -> Self {
-        match action {
-            "delete_char_backward" => Self::DeleteBackward,
-            "delete_char_forward" => Self::DeleteForward,
-            "move_left" => Self::MoveLeft,
-            "move_right" => Self::MoveRight,
-            "move_up" => Self::MoveUp,
-            "move_down" => Self::MoveDown,
-            "move_line_start" => Self::MoveLineStart,
-            "move_line_end" => Self::MoveLineEnd,
-            "move_first_line" => Self::MoveFirstLine,
-            "move_last_line" => Self::MoveLastLine,
-            "move_word_next" => Self::MoveWordNext,
-            "move_word_end" => Self::MoveWordEnd,
-            "move_word_prev" => Self::MoveWordPrev,
-            "move_word_end_prev" => Self::MoveWordEndPrev,
-            "next_field" => Self::NextField,
-            "prev_field" => Self::PrevField,
-            "trigger_autocomplete" => Self::TriggerAutocomplete,
-            "suggestion_up" => Self::SuggestionUp,
-            "suggestion_down" => Self::SuggestionDown,
-            "select_suggestion" => Self::SelectSuggestion,
-            "exit_suggestions" => Self::ExitSuggestions,
-            _ => Self::Custom(action.to_string()),
-        }
-    }
-}
-
-#[derive(Debug, Clone, PartialEq)]
 pub enum ActionResult {
-    Success(Option<String>),
+    Success,
-    HandledByFeature(String),
+    Message(String),
-    RequiresContext(String),
+    HandledByApp(String),
+    HandledByFeature(String), // Keep for compatibility
     Error(String),
 }
 
 impl ActionResult {
     pub fn success() -> Self {
-        Self::Success(None)
+        Self::Success
     }
 
     pub fn success_with_message(msg: &str) -> Self {
-        Self::Success(Some(msg.to_string()))
+        Self::Message(msg.to_string())
+    }
+
+    pub fn handled_by_app(msg: &str) -> Self {
+        Self::HandledByApp(msg.to_string())
     }
 
     pub fn error(msg: &str) -> Self {
-        Self::Error(msg.into())
+        Self::Error(msg.to_string())
     }
 
     pub fn is_success(&self) -> bool {
-        matches!(self, Self::Success(_) | Self::HandledByFeature(_))
+        matches!(self, Self::Success | Self::Message(_) | Self::HandledByApp(_) | Self::HandledByFeature(_))
     }
 
     pub fn message(&self) -> Option<&str> {
         match self {
-            Self::Success(msg) => msg.as_deref(),
+            Self::Message(msg) | Self::HandledByApp(msg) | Self::HandledByFeature(msg) | Self::Error(msg) => Some(msg),
-            Self::HandledByFeature(msg) => Some(msg),
+            Self::Success => None,
-            Self::RequiresContext(msg) => Some(msg),
-            Self::Error(msg) => Some(msg),
         }
     }
 }
+
+impl CanvasAction {
+    /// Get a human-readable description of this action
+    pub fn description(&self) -> &'static str {
+        match self {
+            Self::MoveLeft => "move left",
+            Self::MoveRight => "move right",
+            Self::MoveUp => "move up",
+            Self::MoveDown => "move down",
+            Self::MoveWordNext => "next word",
+            Self::MoveWordPrev => "previous word",
+            Self::MoveWordEnd => "word end",
+            Self::MoveWordEndPrev => "previous word end",
+            Self::MoveLineStart => "line start",
+            Self::MoveLineEnd => "line end",
+            Self::NextField => "next field",
+            Self::PrevField => "previous field",
+            Self::MoveFirstLine => "first field",
+            Self::MoveLastLine => "last field",
+            Self::InsertChar(_c) => "insert character",
+            Self::DeleteBackward => "delete backward",
+            Self::DeleteForward => "delete forward",
+            Self::TriggerAutocomplete => "trigger autocomplete",
+            Self::SuggestionUp => "suggestion up",
+            Self::SuggestionDown => "suggestion down",
+            Self::SelectSuggestion => "select suggestion",
+            Self::ExitSuggestions => "exit suggestions",
+            Self::Custom(_name) => "custom action",
+        }
+    }
+
+    /// Get all movement-related actions
+    pub fn movement_actions() -> Vec<CanvasAction> {
+        vec![
+            Self::MoveLeft,
+            Self::MoveRight,
+            Self::MoveUp,
+            Self::MoveDown,
+            Self::MoveWordNext,
+            Self::MoveWordPrev,
+            Self::MoveWordEnd,
+            Self::MoveWordEndPrev,
+            Self::MoveLineStart,
+            Self::MoveLineEnd,
+            Self::NextField,
+            Self::PrevField,
+            Self::MoveFirstLine,
+            Self::MoveLastLine,
+        ]
+    }
+
+    /// Get all editing-related actions
+    pub fn editing_actions() -> Vec<CanvasAction> {
+        vec![
+            Self::InsertChar(' '), // Example char
+            Self::DeleteBackward,
+            Self::DeleteForward,
+        ]
+    }
+
+    /// Get all autocomplete-related actions
+    pub fn autocomplete_actions() -> Vec<CanvasAction> {
+        vec![
+            Self::TriggerAutocomplete,
+            Self::SuggestionUp,
+            Self::SuggestionDown,
+            Self::SelectSuggestion,
+            Self::ExitSuggestions,
+        ]
+    }
+
+    /// Check if this action modifies text content
+    pub fn is_editing_action(&self) -> bool {
+        matches!(self,
+            Self::InsertChar(_) |
+            Self::DeleteBackward |
+            Self::DeleteForward
+        )
+    }
+
+    /// Check if this action moves the cursor
+    pub fn is_movement_action(&self) -> bool {
+        matches!(self,
+            Self::MoveLeft | Self::MoveRight | Self::MoveUp | Self::MoveDown |
+            Self::MoveWordNext | Self::MoveWordPrev | Self::MoveWordEnd | Self::MoveWordEndPrev |
+            Self::MoveLineStart | Self::MoveLineEnd | Self::NextField | Self::PrevField |
+            Self::MoveFirstLine | Self::MoveLastLine
+        )
+    }
+}

canvas/src/canvas/cursor.rs

@@ -0,0 +1,45 @@
+// src/canvas/cursor.rs
+//! Cursor style management for different canvas modes
+
+#[cfg(feature = "cursor-style")]
+use crossterm::{cursor::SetCursorStyle, execute};
+#[cfg(feature = "cursor-style")]
+use std::io;
+
+use crate::canvas::modes::AppMode;
+
+/// Manages cursor styles based on canvas modes
+pub struct CursorManager;
+
+impl CursorManager {
+    /// Update cursor style based on current mode
+    #[cfg(feature = "cursor-style")]
+    pub fn update_for_mode(mode: AppMode) -> io::Result<()> {
+        let style = match mode {
+            AppMode::Edit => SetCursorStyle::SteadyBar,           // Thin line for insert
+            AppMode::ReadOnly => SetCursorStyle::SteadyBlock,     // Block for normal
+            AppMode::Highlight => SetCursorStyle::BlinkingBlock,  // Blinking for visual
+            AppMode::General => SetCursorStyle::SteadyBlock,      // Block for general
+            AppMode::Command => SetCursorStyle::SteadyUnderScore, // Underscore for command
+        };
+        
+        execute!(io::stdout(), style)
+    }
+
+    /// No-op when cursor-style feature is disabled
+    #[cfg(not(feature = "cursor-style"))]
+    pub fn update_for_mode(_mode: AppMode) -> io::Result<()> {
+        Ok(())
+    }
+
+    /// Reset cursor to default on cleanup
+    #[cfg(feature = "cursor-style")]
+    pub fn reset() -> io::Result<()> {
+        execute!(io::stdout(), SetCursorStyle::DefaultUserShape)
+    }
+
+    #[cfg(not(feature = "cursor-style"))]
+    pub fn reset() -> io::Result<()> {
+        Ok(())
+    }
+}

canvas/src/canvas/gui.rs

@@ -1,4 +1,5 @@
-// canvas/src/canvas/gui.rs
+// src/canvas/gui.rs
+//! Canvas GUI updated to work with FormEditor
 
 #[cfg(feature = "gui")]
 use ratatui::{
@@ -9,28 +10,76 @@ use ratatui::{
     Frame,
 };
 
-use crate::canvas::state::CanvasState;
-use crate::canvas::modes::HighlightState;
-
 #[cfg(feature = "gui")]
-use crate::canvas::theme::CanvasTheme;
+use crate::canvas::theme::{CanvasTheme, DefaultCanvasTheme};
+use crate::canvas::modes::HighlightState;
+use crate::data_provider::DataProvider;
+use crate::editor::FormEditor;
 
 #[cfg(feature = "gui")]
 use std::cmp::{max, min};
 
 /// Render ONLY the canvas form fields - no autocomplete
+/// Updated to work with FormEditor instead of CanvasState trait
 #[cfg(feature = "gui")]
-pub fn render_canvas<T: CanvasTheme>(
+pub fn render_canvas<T: CanvasTheme, D: DataProvider>(
     f: &mut Frame,
     area: Rect,
-    form_state: &impl CanvasState,
+    editor: &FormEditor<D>,
+    theme: &T,
+) -> Option<Rect> {
+    // Convert SelectionState to HighlightState
+    let highlight_state = convert_selection_to_highlight(editor.ui_state().selection_state());
+    render_canvas_with_highlight(f, area, editor, theme, &highlight_state)
+}
+
+/// Render canvas with explicit highlight state (for advanced use)
+#[cfg(feature = "gui")]
+pub fn render_canvas_with_highlight<T: CanvasTheme, D: DataProvider>(
+    f: &mut Frame,
+    area: Rect,
+    editor: &FormEditor<D>,
     theme: &T,
-    is_edit_mode: bool,
     highlight_state: &HighlightState,
 ) -> Option<Rect> {
-    let fields: Vec<&str> = form_state.fields();
+    let ui_state = editor.ui_state();
-    let current_field_idx = form_state.current_field();
+    let data_provider = editor.data_provider();
-    let inputs: Vec<&String> = form_state.inputs();
+
+    // Build field information
+    let field_count = data_provider.field_count();
+    let mut fields: Vec<&str> = Vec::with_capacity(field_count);
+    let mut inputs: Vec<String> = Vec::with_capacity(field_count);
+
+    for i in 0..field_count {
+        fields.push(data_provider.field_name(i));
+
+        // Use display text that applies masks if configured
+        #[cfg(feature = "validation")]
+        {
+            if i == editor.current_field() {
+                inputs.push(editor.current_display_text());
+            } else {
+                // For non-current fields, we need to apply mask manually
+                let raw = data_provider.field_value(i);
+                if let Some(cfg) = editor.ui_state().validation_state().get_field_config(i) {
+                    if let Some(mask) = &cfg.display_mask {
+                        inputs.push(mask.apply_to_display(raw));
+                    } else {
+                        inputs.push(raw.to_string());
+                    }
+                } else {
+                    inputs.push(raw.to_string());
+                }
+            }
+        }
+        #[cfg(not(feature = "validation"))]
+        {
+            inputs.push(data_provider.field_value(i).to_string());
+        }
+    }
+
+    let current_field_idx = ui_state.current_field();
+    let is_edit_mode = matches!(ui_state.mode(), crate::canvas::modes::AppMode::Edit);
 
     render_canvas_fields(
         f,
@@ -41,13 +90,60 @@ pub fn render_canvas<T: CanvasTheme>(
         theme,
         is_edit_mode,
         highlight_state,
-        form_state.current_cursor_pos(),
+        editor.display_cursor_position(), // Use display cursor position for masks
-        form_state.has_unsaved_changes(),
+        false, // TODO: track unsaved changes in editor
-        |i| form_state.get_display_value_for_field(i).to_string(),
+        |i| {
-        |i| form_state.has_display_override(i),
+            // Get display value for field i
+            #[cfg(feature = "validation")]
+            {
+                if i == editor.current_field() {
+                    editor.current_display_text()
+                } else {
+                    let raw = data_provider.field_value(i);
+                    if let Some(cfg) = editor.ui_state().validation_state().get_field_config(i) {
+                        if let Some(mask) = &cfg.display_mask {
+                            mask.apply_to_display(raw)
+                        } else {
+                            raw.to_string()
+                        }
+                    } else {
+                        raw.to_string()
+                    }
+                }
+            }
+            #[cfg(not(feature = "validation"))]
+            {
+                data_provider.field_value(i).to_string()
+            }
+        },
+        |i| {
+            // Check if field has display override (mask)
+            #[cfg(feature = "validation")]
+            {
+                editor.ui_state().validation_state().get_field_config(i)
+                    .and_then(|cfg| cfg.display_mask.as_ref())
+                    .is_some()
+            }
+            #[cfg(not(feature = "validation"))]
+            {
+                false
+            }
+        },
     )
 }
 
+/// Convert SelectionState to HighlightState for rendering
+#[cfg(feature = "gui")]
+fn convert_selection_to_highlight(selection: &crate::canvas::state::SelectionState) -> HighlightState {
+    use crate::canvas::state::SelectionState;
+
+    match selection {
+        SelectionState::None => HighlightState::Off,
+        SelectionState::Characterwise { anchor } => HighlightState::Characterwise { anchor: *anchor },
+        SelectionState::Linewise { anchor_field } => HighlightState::Linewise { anchor_line: *anchor_field },
+    }
+}
+
 /// Core canvas field rendering
 #[cfg(feature = "gui")]
 fn render_canvas_fields<T: CanvasTheme, F1, F2>(
@@ -55,7 +151,7 @@ fn render_canvas_fields<T: CanvasTheme, F1, F2>(
     area: Rect,
     fields: &[&str],
     current_field_idx: &usize,
-    inputs: &[&String],
+    inputs: &[String],
     theme: &T,
     is_edit_mode: bool,
     highlight_state: &HighlightState,
@@ -112,7 +208,7 @@ where
     // Render field values and return active field rect
     render_field_values(
         f,
-        input_rows.to_vec(), // Fix: Convert Rc<[Rect]> to Vec<Rect>
+        input_rows.to_vec(),
         inputs,
         current_field_idx,
         theme,
@@ -154,7 +250,7 @@ fn render_field_labels<T: CanvasTheme>(
 fn render_field_values<T: CanvasTheme, F1, F2>(
     f: &mut Frame,
     input_rows: Vec<Rect>,
-    inputs: &[&String],
+    inputs: &[String],
     current_field_idx: &usize,
     theme: &T,
     highlight_state: &HighlightState,
@@ -205,7 +301,7 @@ fn apply_highlighting<'a, T: CanvasTheme>(
     current_cursor_pos: usize,
     highlight_state: &HighlightState,
     theme: &T,
-    is_active: bool,
+    _is_active: bool,
 ) -> Line<'a> {
     let text_len = text.chars().count();
 
@@ -213,23 +309,19 @@ fn apply_highlighting<'a, T: CanvasTheme>(
         HighlightState::Off => {
             Line::from(Span::styled(
                 text,
-                if is_active {
-                    Style::default().fg(theme.highlight())
-                } else {
                 Style::default().fg(theme.fg())
-                },
             ))
         }
         HighlightState::Characterwise { anchor } => {
-            apply_characterwise_highlighting(text, text_len, field_index, current_field_idx, current_cursor_pos, anchor, theme, is_active)
+            apply_characterwise_highlighting(text, text_len, field_index, current_field_idx, current_cursor_pos, anchor, theme, _is_active)
         }
         HighlightState::Linewise { anchor_line } => {
-            apply_linewise_highlighting(text, field_index, current_field_idx, anchor_line, theme, is_active)
+            apply_linewise_highlighting(text, field_index, current_field_idx, anchor_line, theme, _is_active)
         }
     }
 }
 
-/// Apply characterwise highlighting
+/// Apply characterwise highlighting - PROPER VIM-LIKE VERSION
 #[cfg(feature = "gui")]
 fn apply_characterwise_highlighting<'a, T: CanvasTheme>(
     text: &'a str,
@@ -239,21 +331,25 @@ fn apply_characterwise_highlighting<'a, T: CanvasTheme>(
     current_cursor_pos: usize,
     anchor: &(usize, usize),
     theme: &T,
-    is_active: bool,
+    _is_active: bool,
 ) -> Line<'a> {
     let (anchor_field, anchor_char) = *anchor;
     let start_field = min(anchor_field, *current_field_idx);
     let end_field = max(anchor_field, *current_field_idx);
 
+    // Vim-like styling:
+    // - Selected text: contrasting color + background (like vim visual selection)
+    // - All other text: normal color (no special colors for active fields, etc.)
     let highlight_style = Style::default()
-        .fg(theme.highlight())
+        .fg(theme.highlight())          // ✅ Contrasting text color for selected text
-        .bg(theme.highlight_bg())
+        .bg(theme.highlight_bg())       // ✅ Background for selected text
         .add_modifier(Modifier::BOLD);
-    let normal_style_in_highlight = Style::default().fg(theme.highlight());
+
-    let normal_style_outside = Style::default().fg(theme.fg());
+    let normal_style = Style::default().fg(theme.fg()); // ✅ Normal text color everywhere else
 
     if field_index >= start_field && field_index <= end_field {
         if start_field == end_field {
+            // Single field selection
             let (start_char, end_char) = if anchor_field == *current_field_idx {
                 (min(anchor_char, current_cursor_pos), max(anchor_char, current_cursor_pos))
             } else if anchor_field < *current_field_idx {
@@ -273,23 +369,64 @@ fn apply_characterwise_highlighting<'a, T: CanvasTheme>(
             let after: String = text.chars().skip(clamped_end + 1).collect();
 
             Line::from(vec![
-                Span::styled(before, normal_style_in_highlight),
+                Span::styled(before, normal_style),         // Normal text color
-                Span::styled(highlighted, highlight_style),
+                Span::styled(highlighted, highlight_style), // Contrasting color + background
-                Span::styled(after, normal_style_in_highlight),
+                Span::styled(after, normal_style),          // Normal text color
             ])
         } else {
             // Multi-field selection
-            Line::from(Span::styled(text, highlight_style))
+            if field_index == anchor_field {
+                if anchor_field < *current_field_idx {
+                    let clamped_start = anchor_char.min(text_len);
+                    let before: String = text.chars().take(clamped_start).collect();
+                    let highlighted: String = text.chars().skip(clamped_start).collect();
+
+                    Line::from(vec![
+                        Span::styled(before, normal_style),
+                        Span::styled(highlighted, highlight_style),
+                    ])
+                } else {
+                    let clamped_end = anchor_char.min(text_len);
+                    let highlighted: String = text.chars().take(clamped_end + 1).collect();
+                    let after: String = text.chars().skip(clamped_end + 1).collect();
+
+                    Line::from(vec![
+                        Span::styled(highlighted, highlight_style),
+                        Span::styled(after, normal_style),
+                    ])
+                }
+            } else if field_index == *current_field_idx {
+                if anchor_field < *current_field_idx {
+                    let clamped_end = current_cursor_pos.min(text_len);
+                    let highlighted: String = text.chars().take(clamped_end + 1).collect();
+                    let after: String = text.chars().skip(clamped_end + 1).collect();
+
+                    Line::from(vec![
+                        Span::styled(highlighted, highlight_style),
+                        Span::styled(after, normal_style),
+                    ])
+                } else {
+                    let clamped_start = current_cursor_pos.min(text_len);
+                    let before: String = text.chars().take(clamped_start).collect();
+                    let highlighted: String = text.chars().skip(clamped_start).collect();
+
+                    Line::from(vec![
+                        Span::styled(before, normal_style),
+                        Span::styled(highlighted, highlight_style),
+                    ])
                 }
             } else {
-        Line::from(Span::styled(
+                // Middle field: highlight entire field
-            text,
+                Line::from(Span::styled(text, highlight_style))
-            if is_active { normal_style_in_highlight } else { normal_style_outside }
+            }
-        ))
+        }
+    } else {
+        // Outside selection: always normal text color (no special active field color)
+        Line::from(Span::styled(text, normal_style))
     }
 }
 
-/// Apply linewise highlighting
+/// Apply linewise highlighting - PROPER VIM-LIKE VERSION
 #[cfg(feature = "gui")]
 fn apply_linewise_highlighting<'a, T: CanvasTheme>(
     text: &'a str,
@@ -297,25 +434,27 @@ fn apply_linewise_highlighting<'a, T: CanvasTheme>(
     current_field_idx: &usize,
     anchor_line: &usize,
     theme: &T,
-    is_active: bool,
+    _is_active: bool,
 ) -> Line<'a> {
     let start_field = min(*anchor_line, *current_field_idx);
     let end_field = max(*anchor_line, *current_field_idx);
 
+    // Vim-like styling:
+    // - Selected lines: contrasting text color + background
+    // - All other lines: normal text color (no special active field color)
     let highlight_style = Style::default()
-        .fg(theme.highlight())
+        .fg(theme.highlight())          // ✅ Contrasting text color for selected text
-        .bg(theme.highlight_bg())
+        .bg(theme.highlight_bg())       // ✅ Background for selected text
         .add_modifier(Modifier::BOLD);
-    let normal_style_in_highlight = Style::default().fg(theme.highlight());
+
-    let normal_style_outside = Style::default().fg(theme.fg());
+    let normal_style = Style::default().fg(theme.fg()); // ✅ Normal text color everywhere else
 
     if field_index >= start_field && field_index <= end_field {
+        // Selected line: contrasting text color + background
         Line::from(Span::styled(text, highlight_style))
     } else {
-        Line::from(Span::styled(
+        // Normal line: normal text color (no special active field color)
-            text,
+        Line::from(Span::styled(text, normal_style))
-            if is_active { normal_style_in_highlight } else { normal_style_outside }
-        ))
     }
 }
 
@@ -328,11 +467,24 @@ fn set_cursor_position(
     current_cursor_pos: usize,
     has_display_override: bool,
 ) {
-    let cursor_x = if has_display_override {
+    // BUG FIX: Use the correct display cursor position, not end of text
-        field_rect.x + text.chars().count() as u16
+    let cursor_x = field_rect.x + current_cursor_pos as u16;
-    } else {
-        field_rect.x + current_cursor_pos as u16
-    };
     let cursor_y = field_rect.y;
-    f.set_cursor_position((cursor_x, cursor_y));
+    
+    // SAFETY: Ensure cursor doesn't go beyond field bounds
+    let max_cursor_x = field_rect.x + field_rect.width.saturating_sub(1);
+    let safe_cursor_x = cursor_x.min(max_cursor_x);
+    
+    f.set_cursor_position((safe_cursor_x, cursor_y));
+}
+
+/// Set default theme if custom not specified
+#[cfg(feature = "gui")]
+pub fn render_canvas_default<D: DataProvider>(
+    f: &mut Frame,
+    area: Rect,
+    editor: &FormEditor<D>,
+) -> Option<Rect> {
+    let theme = DefaultCanvasTheme::default();
+    render_canvas(f, area, editor, &theme)
 }

canvas/src/canvas/mod.rs

@@ -1,20 +1,19 @@
 // src/canvas/mod.rs
+
 pub mod actions;
-pub mod gui;
-pub mod modes; 
 pub mod state;
+pub mod modes;
+
+#[cfg(feature = "gui")]
+pub mod gui;
+#[cfg(feature = "gui")]
 pub mod theme;
 
-// Re-export commonly used canvas types
+#[cfg(feature = "cursor-style")]
-pub use actions::{CanvasAction, ActionResult};
+pub mod cursor;
+
+// Keep these exports for current functionality
 pub use modes::{AppMode, ModeManager, HighlightState};
-pub use state::{CanvasState, ActionContext};
 
-// Re-export the main entry point
+#[cfg(feature = "cursor-style")]
-pub use crate::dispatcher::execute_canvas_action;
+pub use cursor::CursorManager;
-
-#[cfg(feature = "gui")]
-pub use theme::CanvasTheme;
-
-#[cfg(feature = "gui")]
-pub use gui::render_canvas;

canvas/src/canvas/modes/manager.rs

@@ -1,6 +1,8 @@
 // src/modes/handlers/mode_manager.rs
 // canvas/src/modes/manager.rs
 
+#[cfg(feature = "cursor-style")]
+use crate::canvas::CursorManager;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum AppMode {
@@ -30,4 +32,39 @@ impl ModeManager {
     pub fn can_enter_highlight_mode(current_mode: AppMode) -> bool {
         matches!(current_mode, AppMode::ReadOnly)
     }
+
+
+    /// Transition to new mode with automatic cursor update (when cursor-style feature enabled)
+    pub fn transition_to_mode(current_mode: AppMode, new_mode: AppMode) -> std::io::Result<AppMode> {
+        if current_mode != new_mode {
+            #[cfg(feature = "cursor-style")]
+            {
+                let _ = CursorManager::update_for_mode(new_mode);
+            }
+        }
+        Ok(new_mode)
+    }
+
+    /// Enter highlight mode with cursor styling
+    pub fn enter_highlight_mode_with_cursor(current_mode: AppMode) -> std::io::Result<bool> {
+        if Self::can_enter_highlight_mode(current_mode) {
+            #[cfg(feature = "cursor-style")]
+            {
+                let _ = CursorManager::update_for_mode(AppMode::Highlight);
+            }
+            Ok(true)
+        } else {
+            Ok(false)
+        }
+    }
+
+    /// Exit highlight mode with cursor styling
+    pub fn exit_highlight_mode_with_cursor() -> std::io::Result<AppMode> {
+        let new_mode = AppMode::ReadOnly;
+        #[cfg(feature = "cursor-style")]
+        {
+            let _ = CursorManager::update_for_mode(new_mode);
+        }
+        Ok(new_mode)
+    }
 }

canvas/src/canvas/state.rs

@@ -1,117 +1,150 @@
 // src/canvas/state.rs
-//! Canvas state trait and related types
+//! Library-owned UI state - user never directly modifies this
-//! 
-//! This module defines the core trait that any form or input system must implement
-//! to work with the canvas library.
 
-use crate::canvas::actions::CanvasAction;
 use crate::canvas::modes::AppMode;
 
-/// Context information passed to feature-specific action handlers
+/// Library-owned UI state - user never directly modifies this
-#[derive(Debug)]
+#[derive(Debug, Clone)]
-pub struct ActionContext {
+pub struct EditorState {
-    /// Original key code that triggered this action (for backwards compatibility)
+    // Navigation state
-    pub key_code: Option<crossterm::event::KeyCode>,
+    pub(crate) current_field: usize,
-    /// Current ideal cursor column for vertical movement
+    pub(crate) cursor_pos: usize,
-    pub ideal_cursor_column: usize,
+    pub(crate) ideal_cursor_column: usize,
-    /// Current input text
+
-    pub current_input: String,
+    // Mode state
-    /// Current field index
+    pub(crate) current_mode: AppMode,
-    pub current_field: usize,
+
+    // Autocomplete state
+    pub(crate) autocomplete: AutocompleteUIState,
+
+    // Selection state (for vim visual mode)
+    pub(crate) selection: SelectionState,
+    
+    // Validation state (only available with validation feature)
+    #[cfg(feature = "validation")]
+    pub(crate) validation: crate::validation::ValidationState,
 }
 
-/// Core trait that any form-like state must implement to work with canvas
+#[derive(Debug, Clone)]
-/// 
+pub struct AutocompleteUIState {
-/// This trait enables the same mode behaviors (edit, read-only, highlight) to work
+    pub(crate) is_active: bool,
-/// across any implementation - login forms, data entry forms, configuration screens, etc.
+    pub(crate) is_loading: bool,
-/// 
+    pub(crate) selected_index: Option<usize>,
-/// # Required Implementation
+    pub(crate) active_field: Option<usize>,
-/// 
+}
-/// Your struct needs to track:
-/// - Current field index and cursor position
-/// - All input field values 
-/// - Current interaction mode
-/// - Whether there are unsaved changes
-/// 
-/// # Example Implementation
-/// 
-/// ```rust
-/// struct MyForm {
-///     fields: Vec<String>,
-///     current_field: usize, 
-///     cursor_pos: usize,
-///     mode: AppMode,
-///     dirty: bool,
-/// }
-/// 
-/// impl CanvasState for MyForm {
-///     fn current_field(&self) -> usize { self.current_field }
-///     fn current_cursor_pos(&self) -> usize { self.cursor_pos }
-///     // ... implement other required methods
-/// }
-/// ```
-pub trait CanvasState {
-    // --- Core Navigation ---
 
-    /// Get current field index (0-based)
+#[derive(Debug, Clone)]
-    fn current_field(&self) -> usize;
+pub enum SelectionState {
+    None,
+    Characterwise { anchor: (usize, usize) },
+    Linewise { anchor_field: usize },
+}
 
-    /// Get current cursor position within the current field
+impl EditorState {
-    fn current_cursor_pos(&self) -> usize;
+    pub fn new() -> Self {
-    
+        Self {
-    /// Set current field index (should clamp to valid range)
+            current_field: 0,
-    fn set_current_field(&mut self, index: usize);
+            cursor_pos: 0,
-    
+            ideal_cursor_column: 0,
-    /// Set cursor position within current field (should clamp to valid range)
+            current_mode: AppMode::Edit,
-    fn set_current_cursor_pos(&mut self, pos: usize);
+            autocomplete: AutocompleteUIState {
-
+                is_active: false,
-    // --- Mode Information ---
+                is_loading: false,
-    
+                selected_index: None,
-    /// Get current interaction mode (edit, read-only, highlight, etc.)
+                active_field: None,
-    fn current_mode(&self) -> AppMode;
+            },
-
+            selection: SelectionState::None,
-    // --- Data Access ---
+            #[cfg(feature = "validation")]
-    
+            validation: crate::validation::ValidationState::new(),
-    /// Get immutable reference to current field's text
+        }
-    fn get_current_input(&self) -> &str;
-    
-    /// Get mutable reference to current field's text
-    fn get_current_input_mut(&mut self) -> &mut String;
-    
-    /// Get all input values as immutable references
-    fn inputs(&self) -> Vec<&String>;
-    
-    /// Get all field names/labels
-    fn fields(&self) -> Vec<&str>;
-
-    // --- State Management ---
-    
-    /// Check if there are unsaved changes
-    fn has_unsaved_changes(&self) -> bool;
-    
-    /// Mark whether there are unsaved changes
-    fn set_has_unsaved_changes(&mut self, changed: bool);
-
-    // --- Optional Overrides ---
-
-    /// Handle application-specific actions not covered by standard handlers
-    /// Return Some(message) if the action was handled, None to use standard handling
-    fn handle_feature_action(&mut self, _action: &CanvasAction, _context: &ActionContext) -> Option<String> {
-        None // Default: no custom handling
     }
 
-    /// Get display value for a field (may differ from actual value)
+    // ===================================================================
-    /// Used for things like password masking or computed display values
+    // READ-ONLY ACCESS: User can fetch UI state for compatibility
-    fn get_display_value_for_field(&self, index: usize) -> &str {
+    // ===================================================================
-        self.inputs()
+
-            .get(index)
+    /// Get current field index (for user's business logic)
-            .map(|s| s.as_str())
+    pub fn current_field(&self) -> usize {
-            .unwrap_or("")
+        self.current_field
     }
 
-    /// Check if a field has a custom display value
+    /// Get current cursor position (for user's business logic)
-    /// Return true if get_display_value_for_field returns something different than the actual value
+    pub fn cursor_position(&self) -> usize {
-    fn has_display_override(&self, _index: usize) -> bool {
+        self.cursor_pos
-        false
+    }
+
+    /// Get ideal cursor column (for vim-like behavior)
+    pub fn ideal_cursor_column(&self) -> usize {
+        self.ideal_cursor_column
+    }
+
+    /// Get current mode (for user's business logic)
+    pub fn mode(&self) -> AppMode {
+        self.current_mode
+    }
+
+    /// Check if autocomplete is active (for user's business logic)
+    pub fn is_autocomplete_active(&self) -> bool {
+        self.autocomplete.is_active
+    }
+
+    /// Check if autocomplete is loading (for user's business logic)
+    pub fn is_autocomplete_loading(&self) -> bool {
+        self.autocomplete.is_loading
+    }
+
+    /// Get selection state (for user's business logic)
+    pub fn selection_state(&self) -> &SelectionState {
+        &self.selection
+    }
+    
+    /// Get validation state (for user's business logic)
+    /// Only available when the 'validation' feature is enabled
+    #[cfg(feature = "validation")]
+    pub fn validation_state(&self) -> &crate::validation::ValidationState {
+        &self.validation
+    }
+
+    // ===================================================================
+    // INTERNAL MUTATIONS: Only library modifies these
+    // ===================================================================
+
+    pub(crate) fn move_to_field(&mut self, field_index: usize, field_count: usize) {
+        if field_index < field_count {
+            self.current_field = field_index;
+            // Reset cursor to safe position - will be clamped by movement logic
+            self.cursor_pos = 0;
+        }
+    }
+
+    pub(crate) fn set_cursor(&mut self, position: usize, max_position: usize, for_edit_mode: bool) {
+        if for_edit_mode {
+            // Edit mode: can go past end for insertion
+            self.cursor_pos = position.min(max_position);
+        } else {
+            // ReadOnly/Highlight: stay within text bounds
+            self.cursor_pos = position.min(max_position.saturating_sub(1));
+        }
+        self.ideal_cursor_column = self.cursor_pos;
+    }
+
+    pub(crate) fn activate_autocomplete(&mut self, field_index: usize) {
+        self.autocomplete.is_active = true;
+        self.autocomplete.is_loading = true;
+        self.autocomplete.active_field = Some(field_index);
+        self.autocomplete.selected_index = None;
+    }
+
+    pub(crate) fn deactivate_autocomplete(&mut self) {
+        self.autocomplete.is_active = false;
+        self.autocomplete.is_loading = false;
+        self.autocomplete.active_field = None;
+        self.autocomplete.selected_index = None;
+    }
+}
+
+impl Default for EditorState {
+    fn default() -> Self {
+        Self::new()
     }
 }

canvas/src/canvas/theme.rs

@@ -15,3 +15,36 @@ pub trait CanvasTheme {
     fn highlight_bg(&self) -> Color;
     fn warning(&self) -> Color;
 }
+
+
+#[cfg(feature = "gui")]
+#[derive(Debug, Clone, Default)]
+pub struct DefaultCanvasTheme;
+
+#[cfg(feature = "gui")]
+impl CanvasTheme for DefaultCanvasTheme {
+    fn bg(&self) -> Color {
+        Color::Black
+    }
+    fn fg(&self) -> Color {
+        Color::White
+    }
+    fn border(&self) -> Color {
+        Color::DarkGray
+    }
+    fn accent(&self) -> Color {
+        Color::Cyan
+    }
+    fn secondary(&self) -> Color {
+        Color::Gray
+    }
+    fn highlight(&self) -> Color {
+        Color::Yellow
+    }
+    fn highlight_bg(&self) -> Color {
+        Color::Blue
+    }
+    fn warning(&self) -> Color {
+        Color::Red
+    }
+}

canvas/src/config/config.rs

@@ -1,665 +0,0 @@
-// src/config/config.rs
-use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
-use crossterm::event::{KeyCode, KeyModifiers};
-use anyhow::{Context, Result};
-
-// Import from sibling modules
-use super::registry::ActionRegistry;
-use super::validation::{ConfigValidator, ValidationError, ValidationResult, ValidationWarning};
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct CanvasKeybindings {
-    pub edit: HashMap<String, Vec<String>>,
-    pub read_only: HashMap<String, Vec<String>>,
-    pub global: HashMap<String, Vec<String>>,
-}
-
-impl Default for CanvasKeybindings {
-    fn default() -> Self {
-        Self {
-            edit: HashMap::new(),
-            read_only: HashMap::new(),
-            global: HashMap::new(),
-        }
-    }
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct CanvasBehavior {
-    pub confirm_on_save: bool,
-    pub auto_indent: bool,
-    pub wrap_search: bool,
-    pub wrap_around_fields: bool,
-}
-
-impl Default for CanvasBehavior {
-    fn default() -> Self {
-        Self {
-            confirm_on_save: true,
-            auto_indent: true,
-            wrap_search: true,
-            wrap_around_fields: true,
-        }
-    }
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct CanvasAppearance {
-    pub line_numbers: bool,
-    pub syntax_highlighting: bool,
-    pub current_line_highlight: bool,
-}
-
-impl Default for CanvasAppearance {
-    fn default() -> Self {
-        Self {
-            line_numbers: true,
-            syntax_highlighting: true,
-            current_line_highlight: true,
-        }
-    }
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct CanvasConfig {
-    pub keybindings: CanvasKeybindings,
-    pub behavior: CanvasBehavior,
-    pub appearance: CanvasAppearance,
-}
-
-impl Default for CanvasConfig {
-    fn default() -> Self {
-        Self {
-            keybindings: CanvasKeybindings::with_vim_defaults(),
-            behavior: CanvasBehavior::default(),
-            appearance: CanvasAppearance::default(),
-        }
-    }
-}
-
-impl CanvasKeybindings {
-    /// Generate complete vim defaults from introspection system
-    /// This ensures defaults are always in sync with actual handler capabilities
-    pub fn with_vim_defaults() -> Self {
-        let registry = ActionRegistry::from_handlers();
-        Self::generate_from_registry(&registry)
-    }
-
-    /// Generate keybindings from action registry (used by both defaults and config generation)
-    /// This is the single source of truth for what keybindings should exist
-    fn generate_from_registry(registry: &ActionRegistry) -> Self {
-        let mut keybindings = Self::default();
-
-        // Generate keybindings for each mode discovered by introspection
-        for (mode_name, mode_registry) in &registry.modes {
-            let mode_bindings = match mode_name.as_str() {
-                "edit" => &mut keybindings.edit,
-                "read_only" => &mut keybindings.read_only,
-                "highlight" => &mut keybindings.global, // Highlight actions go in global
-                _ => {
-                    // Handle any future modes discovered by introspection
-                    eprintln!("Warning: Unknown mode '{}' discovered by introspection", mode_name);
-                    continue;
-                }
-            };
-
-            // Add ALL required actions
-            for (action_name, action_spec) in &mode_registry.required {
-                if !action_spec.examples.is_empty() {
-                    mode_bindings.insert(
-                        action_name.clone(),
-                        action_spec.examples.clone()
-                    );
-                }
-            }
-
-            // Add ALL optional actions
-            for (action_name, action_spec) in &mode_registry.optional {
-                if !action_spec.examples.is_empty() {
-                    mode_bindings.insert(
-                        action_name.clone(),
-                        action_spec.examples.clone()
-                    );
-                }
-            }
-        }
-
-        keybindings
-    }
-
-    /// Generate a minimal fallback configuration if introspection fails
-    /// This should rarely be used, but provides safety net
-    fn minimal_fallback() -> Self {
-        let mut keybindings = Self::default();
-
-        // Absolute minimum required for basic functionality
-        keybindings.read_only.insert("move_left".to_string(), vec!["h".to_string()]);
-        keybindings.read_only.insert("move_right".to_string(), vec!["l".to_string()]);
-        keybindings.read_only.insert("move_up".to_string(), vec!["k".to_string()]);
-        keybindings.read_only.insert("move_down".to_string(), vec!["j".to_string()]);
-
-        keybindings.edit.insert("delete_char_backward".to_string(), vec!["Backspace".to_string()]);
-        keybindings.edit.insert("move_left".to_string(), vec!["Left".to_string()]);
-        keybindings.edit.insert("move_right".to_string(), vec!["Right".to_string()]);
-        keybindings.edit.insert("move_up".to_string(), vec!["Up".to_string()]);
-        keybindings.edit.insert("move_down".to_string(), vec!["Down".to_string()]);
-
-        keybindings
-    }
-
-    /// Validate that generated keybindings match the current introspection state
-    /// This helps catch when handlers change but defaults become stale
-    pub fn validate_against_introspection(&self) -> Result<(), Vec<String>> {
-        let registry = ActionRegistry::from_handlers();
-        let expected = Self::generate_from_registry(&registry);
-        let mut errors = Vec::new();
-
-        // Check each mode
-        for (mode_name, expected_bindings) in [
-            ("edit", &expected.edit),
-            ("read_only", &expected.read_only),
-            ("global", &expected.global),
-        ] {
-            let actual_bindings = match mode_name {
-                "edit" => &self.edit,
-                "read_only" => &self.read_only,
-                "global" => &self.global,
-                _ => continue,
-            };
-
-            // Check for missing actions
-            for action_name in expected_bindings.keys() {
-                if !actual_bindings.contains_key(action_name) {
-                    errors.push(format!(
-                        "Missing action '{}' in {} mode (expected by introspection)",
-                        action_name, mode_name
-                    ));
-                }
-            }
-
-            // Check for unexpected actions
-            for action_name in actual_bindings.keys() {
-                if !expected_bindings.contains_key(action_name) {
-                    errors.push(format!(
-                        "Unexpected action '{}' in {} mode (not found in introspection)",
-                        action_name, mode_name
-                    ));
-                }
-            }
-        }
-
-        if errors.is_empty() {
-            Ok(())
-        } else {
-            Err(errors)
-        }
-    }
-}
-
-impl CanvasConfig {
-    /// Enhanced load method with introspection validation
-    pub fn load() -> Self {
-        match Self::load_and_validate() {
-            Ok(config) => config,
-            Err(e) => {
-                eprintln!("Failed to load config file: {}", e);
-                eprintln!("Using auto-generated defaults from introspection");
-                Self::default()
-            }
-        }
-    }
-
-    /// Load and validate configuration with enhanced introspection checks
-    pub fn load_and_validate() -> Result<Self> {
-        // Try to load canvas_config.toml from current directory
-        let config = if let Ok(config) = Self::from_file(std::path::Path::new("canvas_config.toml")) {
-            config
-        } else {
-            // Use auto-generated defaults if file doesn't exist
-            eprintln!("Config file not found, using auto-generated defaults");
-            Self::default()
-        };
-
-        // Validate the configuration against current introspection state
-        let registry = ActionRegistry::from_handlers();
-
-        // Validate handlers are working correctly
-        if let Err(handler_errors) = registry.validate_against_implementation() {
-            eprintln!("Handler validation warnings:");
-            for error in handler_errors {
-                eprintln!("  - {}", error);
-            }
-        }
-
-        // Validate the configuration against the dynamic registry
-        let validator = ConfigValidator::new(registry);
-        let validation_result = validator.validate_keybindings(&config.keybindings);
-
-        if !validation_result.is_valid {
-            eprintln!("Configuration validation failed:");
-            validator.print_validation_result(&validation_result);
-        } else if !validation_result.warnings.is_empty() {
-            eprintln!("Configuration validation warnings:");
-            validator.print_validation_result(&validation_result);
-        }
-
-        // Optional: Validate that our defaults match introspection
-        if let Err(sync_errors) = config.keybindings.validate_against_introspection() {
-            eprintln!("Default keybindings out of sync with introspection:");
-            for error in sync_errors {
-                eprintln!("  - {}", error);
-            }
-        }
-
-        Ok(config)
-    }
-
-    /// Generate a complete configuration template that matches current defaults
-    /// This ensures the generated config file has the same content as defaults
-    pub fn generate_complete_template() -> String {
-        let registry = ActionRegistry::from_handlers();
-        let defaults = CanvasKeybindings::generate_from_registry(&registry);
-
-        let mut template = String::new();
-        template.push_str("# Canvas Library Configuration\n");
-        template.push_str("# Auto-generated from handler introspection\n");
-        template.push_str("# This config contains ALL available actions\n\n");
-
-        // Generate sections for each mode
-        for (mode_name, bindings) in [
-            ("read_only", &defaults.read_only),
-            ("edit", &defaults.edit),
-            ("global", &defaults.global),
-        ] {
-            if bindings.is_empty() {
-                continue;
-            }
-
-            template.push_str(&format!("[keybindings.{}]\n", mode_name));
-
-            // Get mode registry for categorization
-            if let Some(mode_registry) = registry.get_mode_registry(mode_name) {
-                // Required actions first
-                let mut found_required = false;
-                for (action_name, keybindings) in bindings {
-                    if mode_registry.required.contains_key(action_name) {
-                        if !found_required {
-                            template.push_str("# Required\n");
-                            found_required = true;
-                        }
-                        template.push_str(&format!("{} = {:?}\n", action_name, keybindings));
-                    }
-                }
-
-                // Optional actions second
-                let mut found_optional = false;
-                for (action_name, keybindings) in bindings {
-                    if mode_registry.optional.contains_key(action_name) {
-                        if !found_optional {
-                            template.push_str("# Optional\n");
-                            found_optional = true;
-                        }
-                        template.push_str(&format!("{} = {:?}\n", action_name, keybindings));
-                    }
-                }
-            } else {
-                // Fallback: just list all actions
-                for (action_name, keybindings) in bindings {
-                    template.push_str(&format!("{} = {:?}\n", action_name, keybindings));
-                }
-            }
-
-            template.push('\n');
-        }
-
-        template
-    }
-
-    /// Generate config that only contains actions different from defaults
-    /// Useful for minimal user configs
-    pub fn generate_minimal_template() -> String {
-        let defaults = CanvasKeybindings::with_vim_defaults();
-
-        let mut template = String::new();
-        template.push_str("# Minimal Canvas Configuration\n");
-        template.push_str("# Only uncomment and modify the keybindings you want to change\n");
-        template.push_str("# All other actions will use their default vim-style keybindings\n\n");
-
-        for (mode_name, bindings) in [
-            ("read_only", &defaults.read_only),
-            ("edit", &defaults.edit),
-            ("global", &defaults.global),
-        ] {
-            if bindings.is_empty() {
-                continue;
-            }
-
-            template.push_str(&format!("# [keybindings.{}]\n", mode_name));
-
-            for (action_name, keybindings) in bindings {
-                template.push_str(&format!("# {} = {:?}\n", action_name, keybindings));
-            }
-
-            template.push('\n');
-        }
-
-        template
-    }
-
-    /// Generate template from actual handler capabilities (legacy method for compatibility)
-    pub fn generate_template() -> String {
-        Self::generate_complete_template()
-    }
-
-    /// Generate clean template from actual handler capabilities (legacy method for compatibility)
-    pub fn generate_clean_template() -> String {
-        let registry = ActionRegistry::from_handlers();
-        
-        // Validate handlers first
-        if let Err(errors) = registry.validate_against_implementation() {
-            for error in errors {
-                eprintln!("   - {}", error);
-            }
-        }
-
-        registry.generate_clean_template()
-    }
-
-    /// Validate current configuration against actual implementation
-    pub fn validate(&self) -> ValidationResult {
-        let registry = ActionRegistry::from_handlers();
-        let validator = ConfigValidator::new(registry);
-        validator.validate_keybindings(&self.keybindings)
-    }
-
-    /// Print validation results for current config
-    pub fn print_validation(&self) {
-        let registry = ActionRegistry::from_handlers();
-        let validator = ConfigValidator::new(registry);
-        let result = validator.validate_keybindings(&self.keybindings);
-        validator.print_validation_result(&result);
-    }
-
-    /// Load from TOML string
-    pub fn from_toml(toml_str: &str) -> Result<Self> {
-        toml::from_str(toml_str)
-            .context("Failed to parse TOML configuration")
-    }
-
-    /// Load from file
-    pub fn from_file(path: &std::path::Path) -> Result<Self> {
-        let contents = std::fs::read_to_string(path)
-            .context("Failed to read config file")?;
-        Self::from_toml(&contents)
-    }
-
-    /// Check if autocomplete should auto-trigger (simple logic)
-    pub fn should_auto_trigger_autocomplete(&self) -> bool {
-        // If trigger_autocomplete keybinding exists anywhere, use manual mode only
-        // If no trigger_autocomplete keybinding, use auto-trigger mode
-        !self.has_trigger_autocomplete_keybinding()
-    }
-
-    /// Check if user has configured manual trigger keybinding
-    pub fn has_trigger_autocomplete_keybinding(&self) -> bool {
-        self.keybindings.edit.contains_key("trigger_autocomplete") ||
-        self.keybindings.read_only.contains_key("trigger_autocomplete") ||
-        self.keybindings.global.contains_key("trigger_autocomplete")
-    }
-
-    /// Get action for key in read-only mode
-    pub fn get_read_only_action(&self, key: KeyCode, modifiers: KeyModifiers) -> Option<&str> {
-        self.get_action_in_mode(&self.keybindings.read_only, key, modifiers)
-            .or_else(|| self.get_action_in_mode(&self.keybindings.global, key, modifiers))
-    }
-
-    /// Get action for key in edit mode
-    pub fn get_edit_action(&self, key: KeyCode, modifiers: KeyModifiers) -> Option<&str> {
-        self.get_action_in_mode(&self.keybindings.edit, key, modifiers)
-            .or_else(|| self.get_action_in_mode(&self.keybindings.global, key, modifiers))
-    }
-
-    /// Get action for key (mode-aware)
-    pub fn get_action_for_key(&self, key: KeyCode, modifiers: KeyModifiers, is_edit_mode: bool, _has_suggestions: bool) -> Option<&str> {
-        // Check mode-specific
-        if is_edit_mode {
-            self.get_edit_action(key, modifiers)
-        } else {
-            self.get_read_only_action(key, modifiers)
-        }
-    }
-
-    fn get_action_in_mode<'a>(&self, mode_bindings: &'a HashMap<String, Vec<String>>, key: KeyCode, modifiers: KeyModifiers) -> Option<&'a str> {
-        for (action, bindings) in mode_bindings {
-            for binding in bindings {
-                if self.matches_keybinding(binding, key, modifiers) {
-                    return Some(action);
-                }
-            }
-        }
-        None
-    }
-
-    fn matches_keybinding(&self, binding: &str, key: KeyCode, modifiers: KeyModifiers) -> bool {
-        // Special handling for shift+character combinations
-        if binding.to_lowercase().starts_with("shift+") {
-            let parts: Vec<&str> = binding.split('+').collect();
-            if parts.len() == 2 && parts[1].len() == 1 {
-                let expected_lowercase = parts[1].chars().next().unwrap().to_lowercase().next().unwrap();
-                let expected_uppercase = expected_lowercase.to_uppercase().next().unwrap();
-                if let KeyCode::Char(actual_char) = key {
-                    if actual_char == expected_uppercase && modifiers.contains(KeyModifiers::SHIFT) {
-                        return true;
-                    }
-                }
-            }
-        }
-
-        // Handle Shift+Tab -> BackTab
-        if binding.to_lowercase() == "shift+tab" && key == KeyCode::BackTab && modifiers.is_empty() {
-            return true;
-        }
-
-        // Handle multi-character bindings (all standard keys without modifiers)
-        if binding.len() > 1 && !binding.contains('+') {
-            return match binding.to_lowercase().as_str() {
-                // Navigation keys
-                "left" => key == KeyCode::Left,
-                "right" => key == KeyCode::Right,
-                "up" => key == KeyCode::Up,
-                "down" => key == KeyCode::Down,
-                "home" => key == KeyCode::Home,
-                "end" => key == KeyCode::End,
-                "pageup" | "pgup" => key == KeyCode::PageUp,
-                "pagedown" | "pgdn" => key == KeyCode::PageDown,
-
-                // Editing keys
-                "insert" | "ins" => key == KeyCode::Insert,
-                "delete" | "del" => key == KeyCode::Delete,
-                "backspace" => key == KeyCode::Backspace,
-
-                // Tab keys
-                "tab" => key == KeyCode::Tab,
-                "backtab" => key == KeyCode::BackTab,
-
-                // Special keys
-                "enter" | "return" => key == KeyCode::Enter,
-                "escape" | "esc" => key == KeyCode::Esc,
-                "space" => key == KeyCode::Char(' '),
-
-                // Function keys F1-F24
-                "f1" => key == KeyCode::F(1),
-                "f2" => key == KeyCode::F(2),
-                "f3" => key == KeyCode::F(3),
-                "f4" => key == KeyCode::F(4),
-                "f5" => key == KeyCode::F(5),
-                "f6" => key == KeyCode::F(6),
-                "f7" => key == KeyCode::F(7),
-                "f8" => key == KeyCode::F(8),
-                "f9" => key == KeyCode::F(9),
-                "f10" => key == KeyCode::F(10),
-                "f11" => key == KeyCode::F(11),
-                "f12" => key == KeyCode::F(12),
-                "f13" => key == KeyCode::F(13),
-                "f14" => key == KeyCode::F(14),
-                "f15" => key == KeyCode::F(15),
-                "f16" => key == KeyCode::F(16),
-                "f17" => key == KeyCode::F(17),
-                "f18" => key == KeyCode::F(18),
-                "f19" => key == KeyCode::F(19),
-                "f20" => key == KeyCode::F(20),
-                "f21" => key == KeyCode::F(21),
-                "f22" => key == KeyCode::F(22),
-                "f23" => key == KeyCode::F(23),
-                "f24" => key == KeyCode::F(24),
-
-                // Lock keys (may not work reliably in all terminals)
-                "capslock" => key == KeyCode::CapsLock,
-                "scrolllock" => key == KeyCode::ScrollLock,
-                "numlock" => key == KeyCode::NumLock,
-
-                // System keys
-                "printscreen" => key == KeyCode::PrintScreen,
-                "pause" => key == KeyCode::Pause,
-                "menu" => key == KeyCode::Menu,
-                "keypadbegin" => key == KeyCode::KeypadBegin,
-
-                // Media keys (rarely supported but included for completeness)
-                "mediaplay" => key == KeyCode::Media(crossterm::event::MediaKeyCode::Play),
-                "mediapause" => key == KeyCode::Media(crossterm::event::MediaKeyCode::Pause),
-                "mediaplaypause" => key == KeyCode::Media(crossterm::event::MediaKeyCode::PlayPause),
-                "mediareverse" => key == KeyCode::Media(crossterm::event::MediaKeyCode::Reverse),
-                "mediastop" => key == KeyCode::Media(crossterm::event::MediaKeyCode::Stop),
-                "mediafastforward" => key == KeyCode::Media(crossterm::event::MediaKeyCode::FastForward),
-                "mediarewind" => key == KeyCode::Media(crossterm::event::MediaKeyCode::Rewind),
-                "mediatracknext" => key == KeyCode::Media(crossterm::event::MediaKeyCode::TrackNext),
-                "mediatrackprevious" => key == KeyCode::Media(crossterm::event::MediaKeyCode::TrackPrevious),
-                "mediarecord" => key == KeyCode::Media(crossterm::event::MediaKeyCode::Record),
-                "medialowervolume" => key == KeyCode::Media(crossterm::event::MediaKeyCode::LowerVolume),
-                "mediaraisevolume" => key == KeyCode::Media(crossterm::event::MediaKeyCode::RaiseVolume),
-                "mediamutevolume" => key == KeyCode::Media(crossterm::event::MediaKeyCode::MuteVolume),
-
-                // Modifier keys (these work better as part of combinations)
-                "leftshift" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::LeftShift),
-                "leftcontrol" | "leftctrl" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::LeftControl),
-                "leftalt" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::LeftAlt),
-                "leftsuper" | "leftwindows" | "leftcmd" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::LeftSuper),
-                "lefthyper" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::LeftHyper),
-                "leftmeta" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::LeftMeta),
-                "rightshift" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::RightShift),
-                "rightcontrol" | "rightctrl" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::RightControl),
-                "rightalt" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::RightAlt),
-                "rightsuper" | "rightwindows" | "rightcmd" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::RightSuper),
-                "righthyper" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::RightHyper),
-                "rightmeta" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::RightMeta),
-                "isolevel3shift" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::IsoLevel3Shift),
-                "isolevel5shift" => key == KeyCode::Modifier(crossterm::event::ModifierKeyCode::IsoLevel5Shift),
-
-                // Multi-key sequences need special handling
-                "gg" => false, // This needs sequence handling
-                _ => {
-                    // Handle single characters and punctuation
-                    if binding.len() == 1 {
-                        if let Some(c) = binding.chars().next() {
-                            key == KeyCode::Char(c)
-                        } else {
-                            false
-                        }
-                    } else {
-                        false
-                    }
-                }
-            };
-        }
-
-        // Handle modifier combinations (like "Ctrl+F5", "Alt+Shift+A")
-        let parts: Vec<&str> = binding.split('+').collect();
-        let mut expected_modifiers = KeyModifiers::empty();
-        let mut expected_key = None;
-
-        for part in parts {
-            match part.to_lowercase().as_str() {
-                // Modifiers
-                "ctrl" | "control" => expected_modifiers |= KeyModifiers::CONTROL,
-                "shift" => expected_modifiers |= KeyModifiers::SHIFT,
-                "alt" => expected_modifiers |= KeyModifiers::ALT,
-                "super" | "windows" | "cmd" => expected_modifiers |= KeyModifiers::SUPER,
-                "hyper" => expected_modifiers |= KeyModifiers::HYPER,
-                "meta" => expected_modifiers |= KeyModifiers::META,
-
-                // Navigation keys
-                "left" => expected_key = Some(KeyCode::Left),
-                "right" => expected_key = Some(KeyCode::Right),
-                "up" => expected_key = Some(KeyCode::Up),
-                "down" => expected_key = Some(KeyCode::Down),
-                "home" => expected_key = Some(KeyCode::Home),
-                "end" => expected_key = Some(KeyCode::End),
-                "pageup" | "pgup" => expected_key = Some(KeyCode::PageUp),
-                "pagedown" | "pgdn" => expected_key = Some(KeyCode::PageDown),
-
-                // Editing keys
-                "insert" | "ins" => expected_key = Some(KeyCode::Insert),
-                "delete" | "del" => expected_key = Some(KeyCode::Delete),
-                "backspace" => expected_key = Some(KeyCode::Backspace),
-
-                // Tab keys
-                "tab" => expected_key = Some(KeyCode::Tab),
-                "backtab" => expected_key = Some(KeyCode::BackTab),
-
-                // Special keys
-                "enter" | "return" => expected_key = Some(KeyCode::Enter),
-                "escape" | "esc" => expected_key = Some(KeyCode::Esc),
-                "space" => expected_key = Some(KeyCode::Char(' ')),
-
-                // Function keys
-                "f1" => expected_key = Some(KeyCode::F(1)),
-                "f2" => expected_key = Some(KeyCode::F(2)),
-                "f3" => expected_key = Some(KeyCode::F(3)),
-                "f4" => expected_key = Some(KeyCode::F(4)),
-                "f5" => expected_key = Some(KeyCode::F(5)),
-                "f6" => expected_key = Some(KeyCode::F(6)),
-                "f7" => expected_key = Some(KeyCode::F(7)),
-                "f8" => expected_key = Some(KeyCode::F(8)),
-                "f9" => expected_key = Some(KeyCode::F(9)),
-                "f10" => expected_key = Some(KeyCode::F(10)),
-                "f11" => expected_key = Some(KeyCode::F(11)),
-                "f12" => expected_key = Some(KeyCode::F(12)),
-                "f13" => expected_key = Some(KeyCode::F(13)),
-                "f14" => expected_key = Some(KeyCode::F(14)),
-                "f15" => expected_key = Some(KeyCode::F(15)),
-                "f16" => expected_key = Some(KeyCode::F(16)),
-                "f17" => expected_key = Some(KeyCode::F(17)),
-                "f18" => expected_key = Some(KeyCode::F(18)),
-                "f19" => expected_key = Some(KeyCode::F(19)),
-                "f20" => expected_key = Some(KeyCode::F(20)),
-                "f21" => expected_key = Some(KeyCode::F(21)),
-                "f22" => expected_key = Some(KeyCode::F(22)),
-                "f23" => expected_key = Some(KeyCode::F(23)),
-                "f24" => expected_key = Some(KeyCode::F(24)),
-
-                // Lock keys
-                "capslock" => expected_key = Some(KeyCode::CapsLock),
-                "scrolllock" => expected_key = Some(KeyCode::ScrollLock),
-                "numlock" => expected_key = Some(KeyCode::NumLock),
-
-                // System keys
-                "printscreen" => expected_key = Some(KeyCode::PrintScreen),
-                "pause" => expected_key = Some(KeyCode::Pause),
-                "menu" => expected_key = Some(KeyCode::Menu),
-                "keypadbegin" => expected_key = Some(KeyCode::KeypadBegin),
-
-                // Single character (letters, numbers, punctuation)
-                part => {
-                    if part.len() == 1 {
-                        if let Some(c) = part.chars().next() {
-                            expected_key = Some(KeyCode::Char(c));
-                        }
-                    }
-                }
-            }
-        }
-
-        modifiers == expected_modifiers && Some(key) == expected_key
-    }
-}

canvas/src/config/introspection.rs

@@ -1,93 +0,0 @@
-// src/config/introspection.rs
-//! Handler capability introspection system
-//! 
-//! This module provides traits and utilities for handlers to report their capabilities,
-//! enabling automatic configuration generation and validation.
-
-use std::collections::HashMap;
-
-/// Specification for a single action that a handler can perform
-#[derive(Debug, Clone)]
-pub struct ActionSpec {
-    /// Action name (e.g., "move_left", "delete_char_backward")
-    pub name: String,
-    /// Human-readable description of what this action does
-    pub description: String,
-    /// Example keybindings for this action (e.g., ["Left", "h"])
-    pub examples: Vec<String>,
-    /// Whether this action is required for the handler to function properly
-    pub is_required: bool,
-}
-
-/// Complete capability description for a single handler
-#[derive(Debug, Clone)]
-pub struct HandlerCapabilities {
-    /// Mode name this handler operates in (e.g., "edit", "read_only")
-    pub mode_name: String,
-    /// All actions this handler can perform
-    pub actions: Vec<ActionSpec>,
-    /// Actions handled automatically without configuration (e.g., "insert_char")
-    pub auto_handled: Vec<String>,
-}
-
-/// Trait that handlers implement to report their capabilities
-/// 
-/// This enables the configuration system to automatically discover what actions
-/// are available and validate user configurations against actual implementations.
-pub trait ActionHandlerIntrospection {
-    /// Return complete capability information for this handler
-    fn introspect() -> HandlerCapabilities;
-
-    /// Validate that this handler actually supports its claimed actions
-    /// Override this to add custom validation logic
-    fn validate_capabilities() -> Result<(), String> {
-        Ok(()) // Default: assume handler is valid
-    }
-}
-
-/// Discovers capabilities from all registered handlers
-pub struct HandlerDiscovery;
-
-impl HandlerDiscovery {
-    /// Discover capabilities from all known handlers
-    /// Add new handlers to this function as they are created
-    pub fn discover_all() -> HashMap<String, HandlerCapabilities> {
-        let mut capabilities = HashMap::new();
-
-        // Register all known handlers here
-        let edit_caps = crate::canvas::actions::handlers::edit::EditHandler::introspect();
-        capabilities.insert("edit".to_string(), edit_caps);
-
-        let readonly_caps = crate::canvas::actions::handlers::readonly::ReadOnlyHandler::introspect();
-        capabilities.insert("read_only".to_string(), readonly_caps);
-
-        let highlight_caps = crate::canvas::actions::handlers::highlight::HighlightHandler::introspect();
-        capabilities.insert("highlight".to_string(), highlight_caps);
-
-        capabilities
-    }
-
-    /// Validate all handlers support their claimed capabilities
-    pub fn validate_all_handlers() -> Result<(), Vec<String>> {
-        let mut errors = Vec::new();
-
-        // Validate each handler
-        if let Err(e) = crate::canvas::actions::handlers::edit::EditHandler::validate_capabilities() {
-            errors.push(format!("Edit handler: {}", e));
-        }
-
-        if let Err(e) = crate::canvas::actions::handlers::readonly::ReadOnlyHandler::validate_capabilities() {
-            errors.push(format!("ReadOnly handler: {}", e));
-        }
-
-        if let Err(e) = crate::canvas::actions::handlers::highlight::HighlightHandler::validate_capabilities() {
-            errors.push(format!("Highlight handler: {}", e));
-        }
-
-        if errors.is_empty() {
-            Ok(())
-        } else {
-            Err(errors)
-        }
-    }
-}

canvas/src/config/mod.rs

@@ -1,12 +0,0 @@
-// src/config/mod.rs
-
-mod registry;
-mod config;
-mod validation;
-pub mod introspection;
-
-// Re-export everything from the main config module
-pub use registry::*;
-pub use validation::*;
-pub use config::*;
-pub use introspection::*;

canvas/src/config/registry.rs

@@ -1,135 +0,0 @@
-// src/config/registry.rs
-
-use std::collections::HashMap;
-use crate::config::introspection::{HandlerDiscovery, ActionSpec, HandlerCapabilities};
-
-#[derive(Debug, Clone)]
-pub struct ModeRegistry {
-    pub required: HashMap<String, ActionSpec>,
-    pub optional: HashMap<String, ActionSpec>,
-    pub auto_handled: Vec<String>,
-}
-
-#[derive(Debug, Clone)]
-pub struct ActionRegistry {
-    pub modes: HashMap<String, ModeRegistry>,
-}
-
-impl ActionRegistry {
-    /// NEW: Create registry by discovering actual handler capabilities
-    pub fn from_handlers() -> Self {
-        let handler_capabilities = HandlerDiscovery::discover_all();
-        let mut modes = HashMap::new();
-        
-        for (mode_name, capabilities) in handler_capabilities {
-            let mode_registry = Self::build_mode_registry(capabilities);
-            modes.insert(mode_name, mode_registry);
-        }
-        
-        Self { modes }
-    }
-    
-    /// Build a mode registry from handler capabilities
-    fn build_mode_registry(capabilities: HandlerCapabilities) -> ModeRegistry {
-        let mut required = HashMap::new();
-        let mut optional = HashMap::new();
-        
-        for action_spec in capabilities.actions {
-            if action_spec.is_required {
-                required.insert(action_spec.name.clone(), action_spec);
-            } else {
-                optional.insert(action_spec.name.clone(), action_spec);
-            }
-        }
-        
-        ModeRegistry {
-            required,
-            optional,
-            auto_handled: capabilities.auto_handled,
-        }
-    }
-    
-    /// Validate that the registry matches the actual implementation
-    pub fn validate_against_implementation(&self) -> Result<(), Vec<String>> {
-        HandlerDiscovery::validate_all_handlers()
-    }
-    
-    pub fn get_mode_registry(&self, mode: &str) -> Option<&ModeRegistry> {
-        self.modes.get(mode)
-    }
-
-    pub fn all_known_actions(&self) -> Vec<String> {
-        let mut actions = Vec::new();
-        
-        for registry in self.modes.values() {
-            actions.extend(registry.required.keys().cloned());
-            actions.extend(registry.optional.keys().cloned());
-        }
-        
-        actions.sort();
-        actions.dedup();
-        actions
-    }
-
-    pub fn generate_config_template(&self) -> String {
-        let mut template = String::new();
-        template.push_str("# Canvas Library Configuration Template\n");
-        template.push_str("# Generated automatically from actual handler capabilities\n\n");
-
-        for (mode_name, registry) in &self.modes {
-            template.push_str(&format!("[keybindings.{}]\n", mode_name));
-            
-            if !registry.required.is_empty() {
-                template.push_str("# REQUIRED ACTIONS - These must be configured\n");
-                for (name, spec) in &registry.required {
-                    template.push_str(&format!("# {}\n", spec.description));
-                    template.push_str(&format!("{} = {:?}\n\n", name, spec.examples));
-                }
-            }
-            
-            if !registry.optional.is_empty() {
-                template.push_str("# OPTIONAL ACTIONS - Configure these if you want them enabled\n");
-                for (name, spec) in &registry.optional {
-                    template.push_str(&format!("# {}\n", spec.description));
-                    template.push_str(&format!("# {} = {:?}\n\n", name, spec.examples));
-                }
-            }
-            
-            if !registry.auto_handled.is_empty() {
-                template.push_str("# AUTO-HANDLED - These are handled automatically, don't configure:\n");
-                for auto_action in &registry.auto_handled {
-                    template.push_str(&format!("# {} (automatic)\n", auto_action));
-                }
-                template.push('\n');
-            }
-        }
-
-        template
-    }
-
-    pub fn generate_clean_template(&self) -> String {
-        let mut template = String::new();
-
-        for (mode_name, registry) in &self.modes {
-            template.push_str(&format!("[keybindings.{}]\n", mode_name));
-            
-            if !registry.required.is_empty() {
-                template.push_str("# Required\n");
-                for (name, spec) in &registry.required {
-                    template.push_str(&format!("{} = {:?}\n", name, spec.examples));
-                }
-            }
-            
-            if !registry.optional.is_empty() {
-                template.push_str("# Optional\n");
-                for (name, spec) in &registry.optional {
-                    template.push_str(&format!("{} = {:?}\n", name, spec.examples));
-                }
-            }
-            
-            template.push('\n');
-        }
-
-        template
-    }
-}

canvas/src/config/validation.rs

@@ -1,278 +0,0 @@
-// src/config/validation.rs
-
-use std::collections::HashMap;
-use thiserror::Error;
-use crate::config::registry::{ActionRegistry, ModeRegistry};
-use crate::config::CanvasKeybindings;
-
-#[derive(Error, Debug)]
-pub enum ValidationError {
-    #[error("Missing required action '{action}' in {mode} mode")]
-    MissingRequired {
-        action: String,
-        mode: String,
-        suggestion: String,
-    },
-
-    #[error("Unknown action '{action}' in {mode} mode")]
-    UnknownAction {
-        action: String,
-        mode: String,
-        similar: Vec<String>,
-    },
-
-    #[error("Multiple validation errors")]
-    Multiple(Vec<ValidationError>),
-}
-
-#[derive(Debug)]
-pub struct ValidationWarning {
-    pub message: String,
-    pub suggestion: Option<String>,
-}
-
-#[derive(Debug)]
-pub struct ValidationResult {
-    pub errors: Vec<ValidationError>,
-    pub warnings: Vec<ValidationWarning>,
-    pub is_valid: bool,
-}
-
-impl ValidationResult {
-    pub fn new() -> Self {
-        Self {
-            errors: Vec::new(),
-            warnings: Vec::new(),
-            is_valid: true,
-        }
-    }
-
-    pub fn add_error(&mut self, error: ValidationError) {
-        self.errors.push(error);
-        self.is_valid = false;
-    }
-
-    pub fn add_warning(&mut self, warning: ValidationWarning) {
-        self.warnings.push(warning);
-    }
-
-    pub fn merge(&mut self, other: ValidationResult) {
-        self.errors.extend(other.errors);
-        self.warnings.extend(other.warnings);
-        if !other.is_valid {
-            self.is_valid = false;
-        }
-    }
-}
-
-pub struct ConfigValidator {
-    registry: ActionRegistry,
-}
-
-impl ConfigValidator {
-    // FIXED: Accept registry parameter to match config.rs calls
-    pub fn new(registry: ActionRegistry) -> Self {
-        Self {
-            registry,
-        }
-    }
-
-    pub fn validate_keybindings(&self, keybindings: &CanvasKeybindings) -> ValidationResult {
-        let mut result = ValidationResult::new();
-
-        // Validate each mode that exists in the registry
-        if let Some(edit_registry) = self.registry.get_mode_registry("edit") {
-            result.merge(self.validate_mode_bindings(
-                "edit",
-                &keybindings.edit,
-                edit_registry
-            ));
-        }
-
-        if let Some(readonly_registry) = self.registry.get_mode_registry("read_only") {
-            result.merge(self.validate_mode_bindings(
-                "read_only",
-                &keybindings.read_only,
-                readonly_registry
-            ));
-        }
-
-        // Skip suggestions mode if not discovered by introspection
-        // (autocomplete is separate concern as requested)
-
-        // Skip global mode if not discovered by introspection
-        // (can be added later if needed)
-
-        result
-    }
-
-    fn validate_mode_bindings(
-        &self,
-        mode_name: &str,
-        bindings: &HashMap<String, Vec<String>>,
-        registry: &ModeRegistry
-    ) -> ValidationResult {
-        let mut result = ValidationResult::new();
-
-        // Check for missing required actions
-        for (action_name, spec) in &registry.required {
-            if !bindings.contains_key(action_name) {
-                result.add_error(ValidationError::MissingRequired {
-                    action: action_name.clone(),
-                    mode: mode_name.to_string(),
-                    suggestion: format!(
-                        "Add to config: {} = {:?}",
-                        action_name,
-                        spec.examples
-                    ),
-                });
-            }
-        }
-
-        // Check for unknown actions
-        let all_known: std::collections::HashSet<_> = registry.required.keys()
-            .chain(registry.optional.keys())
-            .collect();
-
-        for action_name in bindings.keys() {
-            if !all_known.contains(action_name) {
-                let similar = self.find_similar_actions(action_name, &all_known);
-                result.add_error(ValidationError::UnknownAction {
-                    action: action_name.clone(),
-                    mode: mode_name.to_string(),
-                    similar,
-                });
-            }
-        }
-
-        // Check for empty keybinding arrays
-        for (action_name, key_list) in bindings {
-            if key_list.is_empty() {
-                result.add_warning(ValidationWarning {
-                    message: format!(
-                        "Action '{}' in {} mode has empty keybinding list",
-                        action_name, mode_name
-                    ),
-                    suggestion: Some(format!(
-                        "Either add keybindings or remove the action from config"
-                    )),
-                });
-            }
-        }
-
-        // Warn about auto-handled actions that shouldn't be in config
-        for auto_action in &registry.auto_handled {
-            if bindings.contains_key(auto_action) {
-                result.add_warning(ValidationWarning {
-                    message: format!(
-                        "Action '{}' in {} mode is auto-handled and shouldn't be in config",
-                        auto_action, mode_name
-                    ),
-                    suggestion: Some(format!(
-                        "Remove '{}' from config - it's handled automatically",
-                        auto_action
-                    )),
-                });
-            }
-        }
-
-        result
-    }
-
-    fn find_similar_actions(&self, action: &str, known_actions: &std::collections::HashSet<&String>) -> Vec<String> {
-        let mut similar = Vec::new();
-
-        for known in known_actions {
-            if self.is_similar(action, known) {
-                similar.push(known.to_string());
-            }
-        }
-
-        similar.sort();
-        similar.truncate(3); // Limit to 3 suggestions
-        similar
-    }
-
-    fn is_similar(&self, a: &str, b: &str) -> bool {
-        // Simple similarity check - could be improved with proper edit distance
-        let a_lower = a.to_lowercase();
-        let b_lower = b.to_lowercase();
-
-        // Check if one contains the other
-        if a_lower.contains(&b_lower) || b_lower.contains(&a_lower) {
-            return true;
-        }
-
-        // Check for common prefixes
-        let common_prefixes = ["move_", "delete_", "suggestion_"];
-        for prefix in &common_prefixes {
-            if a_lower.starts_with(prefix) && b_lower.starts_with(prefix) {
-                return true;
-            }
-        }
-
-        false
-    }
-
-    pub fn print_validation_result(&self, result: &ValidationResult) {
-        if result.is_valid && result.warnings.is_empty() {
-            println!("✅ Canvas configuration is valid!");
-            return;
-        }
-
-        if !result.errors.is_empty() {
-            println!("❌ Canvas configuration has errors:");
-            for error in &result.errors {
-                match error {
-                    ValidationError::MissingRequired { action, mode, suggestion } => {
-                        println!("  • Missing required action '{}' in {} mode", action, mode);
-                        println!("    💡 {}", suggestion);
-                    }
-                    ValidationError::UnknownAction { action, mode, similar } => {
-                        println!("  • Unknown action '{}' in {} mode", action, mode);
-                        if !similar.is_empty() {
-                            println!("    💡 Did you mean: {}", similar.join(", "));
-                        }
-                    }
-                    ValidationError::Multiple(_) => {
-                        println!("  • Multiple errors occurred");
-                    }
-                }
-                println!();
-            }
-        }
-
-        if !result.warnings.is_empty() {
-            println!("⚠️  Canvas configuration has warnings:");
-            for warning in &result.warnings {
-                println!("  • {}", warning.message);
-                if let Some(suggestion) = &warning.suggestion {
-                    println!("    💡 {}", suggestion);
-                }
-                println!();
-            }
-        }
-
-        if !result.is_valid {
-            println!("🔧 To generate a config template, use:");
-            println!("   CanvasConfig::generate_template()");
-        }
-    }
-
-    pub fn generate_missing_config(&self, keybindings: &CanvasKeybindings) -> String {
-        let mut config = String::new();
-        let validation = self.validate_keybindings(keybindings);
-
-        for error in &validation.errors {
-            if let ValidationError::MissingRequired { action, mode, suggestion } = error {
-                if config.is_empty() {
-                    config.push_str(&format!("# Missing required actions for canvas\n\n"));
-                    config.push_str(&format!("[keybindings.{}]\n", mode));
-                }
-                config.push_str(&format!("{}\n", suggestion));
-            }
-        }
-
-        config
-    }
-}

canvas/src/data_provider.rs

@@ -0,0 +1,51 @@
+// src/data_provider.rs
+//! Simplified user interface - only business data, no UI state
+
+use anyhow::Result;
+use async_trait::async_trait;
+
+/// User implements this - only business data, no UI state
+pub trait DataProvider {
+    /// How many fields in the form
+    fn field_count(&self) -> usize;
+
+    /// Get field label/name
+    fn field_name(&self, index: usize) -> &str;
+
+    /// Get field value
+    fn field_value(&self, index: usize) -> &str;
+
+    /// Set field value (library calls this when text changes)
+    fn set_field_value(&mut self, index: usize, value: String);
+
+    /// Check if field supports autocomplete (optional)
+    fn supports_autocomplete(&self, _field_index: usize) -> bool {
+        false
+    }
+
+    /// Get display value (for password masking, etc.) - optional
+    fn display_value(&self, _index: usize) -> Option<&str> {
+        None // Default: use actual value
+    }
+    
+    /// Get validation configuration for a field (optional)
+    /// Only available when the 'validation' feature is enabled
+    #[cfg(feature = "validation")]
+    fn validation_config(&self, _field_index: usize) -> Option<crate::validation::ValidationConfig> {
+        None
+    }
+}
+
+/// Optional: User implements this for autocomplete data
+#[async_trait]
+pub trait AutocompleteProvider {
+    /// Fetch autocomplete suggestions (user's business logic)
+    async fn fetch_suggestions(&mut self, field_index: usize, query: &str)
+        -> Result<Vec<SuggestionItem>>;
+}
+
+#[derive(Debug, Clone)]
+pub struct SuggestionItem {
+    pub display_text: String,
+    pub value_to_store: String,
+}

canvas/src/dispatcher.rs

@@ -1,110 +0,0 @@
-// src/dispatcher.rs
-
-use crate::canvas::state::{CanvasState, ActionContext};
-use crate::canvas::actions::{CanvasAction, ActionResult};
-use crate::canvas::actions::handlers::{handle_edit_action, handle_readonly_action, handle_highlight_action};
-use crate::canvas::modes::AppMode;
-use crate::config::CanvasConfig;
-use crossterm::event::{KeyCode, KeyModifiers};
-
-/// Main entry point for executing canvas actions
-pub async fn execute_canvas_action<S: CanvasState>(
-    action: CanvasAction,
-    state: &mut S,
-    ideal_cursor_column: &mut usize,
-    config: Option<&CanvasConfig>,
-) -> anyhow::Result<ActionResult> {
-    ActionDispatcher::dispatch_with_config(action, state, ideal_cursor_column, config).await
-}
-
-/// High-level action dispatcher that routes actions to mode-specific handlers
-pub struct ActionDispatcher;
-
-impl ActionDispatcher {
-    /// Dispatch any action to the appropriate mode handler
-    pub async fn dispatch<S: CanvasState>(
-        action: CanvasAction,
-        state: &mut S,
-        ideal_cursor_column: &mut usize,
-    ) -> anyhow::Result<ActionResult> {
-        let config = CanvasConfig::load();
-        Self::dispatch_with_config(action, state, ideal_cursor_column, Some(&config)).await
-    }
-
-    /// Dispatch action with provided config
-    pub async fn dispatch_with_config<S: CanvasState>(
-        action: CanvasAction,
-        state: &mut S,
-        ideal_cursor_column: &mut usize,
-        config: Option<&CanvasConfig>,
-    ) -> anyhow::Result<ActionResult> {
-        // Check for feature-specific handling first
-        let context = ActionContext {
-            key_code: None,
-            ideal_cursor_column: *ideal_cursor_column,
-            current_input: state.get_current_input().to_string(),
-            current_field: state.current_field(),
-        };
-
-        if let Some(result) = state.handle_feature_action(&action, &context) {
-            return Ok(ActionResult::HandledByFeature(result));
-        }
-
-        // Route to mode-specific handler
-        match state.current_mode() {
-            AppMode::Edit => {
-                handle_edit_action(action, state, ideal_cursor_column, config).await
-            }
-            AppMode::ReadOnly => {
-                handle_readonly_action(action, state, ideal_cursor_column, config).await
-            }
-            AppMode::Highlight => {
-                handle_highlight_action(action, state, ideal_cursor_column, config).await
-            }
-            AppMode::General | AppMode::Command => {
-                // These modes might not handle canvas actions directly
-                Ok(ActionResult::success_with_message("Mode does not handle canvas actions"))
-            }
-        }
-    }
-
-    /// Quick action dispatch from KeyCode using config
-    pub async fn dispatch_key<S: CanvasState>(
-        key: KeyCode,
-        modifiers: KeyModifiers,
-        state: &mut S,
-        ideal_cursor_column: &mut usize,
-        is_edit_mode: bool,
-        has_suggestions: bool,
-    ) -> anyhow::Result<Option<ActionResult>> {
-        let config = CanvasConfig::load();
-
-        if let Some(action_name) = config.get_action_for_key(key, modifiers, is_edit_mode, has_suggestions) {
-            let action = CanvasAction::from_string(action_name);
-            let result = Self::dispatch_with_config(action, state, ideal_cursor_column, Some(&config)).await?;
-            Ok(Some(result))
-        } else {
-            Ok(None)
-        }
-    }
-
-    /// Batch dispatch multiple actions
-    pub async fn dispatch_batch<S: CanvasState>(
-        actions: Vec<CanvasAction>,
-        state: &mut S,
-        ideal_cursor_column: &mut usize,
-    ) -> anyhow::Result<Vec<ActionResult>> {
-        let mut results = Vec::new();
-        for action in actions {
-            let result = Self::dispatch(action, state, ideal_cursor_column).await?;
-            let is_success = result.is_success();
-            results.push(result);
-
-            // Stop on first error
-            if !is_success {
-                break;
-            }
-        }
-        Ok(results)
-    }
-}

canvas/src/lib.rs

@@ -1,11 +1,53 @@
 // src/lib.rs
-pub mod canvas;
-pub mod autocomplete;
-pub mod config;
-pub mod dispatcher;
 
-// Re-export the main API for easy access
+pub mod canvas;
-pub use dispatcher::{execute_canvas_action, ActionDispatcher};
+pub mod editor;
+pub mod data_provider;
+
+// Only include autocomplete module if feature is enabled
+#[cfg(feature = "autocomplete")]
+pub mod autocomplete;
+
+// Only include validation module if feature is enabled
+#[cfg(feature = "validation")]
+pub mod validation;
+
+#[cfg(feature = "cursor-style")]
+pub use canvas::CursorManager;
+
+// ===================================================================
+// NEW API: Library-owned state pattern
+// ===================================================================
+
+// Main API exports
+pub use editor::FormEditor;
+pub use data_provider::{DataProvider, AutocompleteProvider, SuggestionItem};
+
+// UI state (read-only access for users)
+pub use canvas::state::EditorState;
+pub use canvas::modes::AppMode;
+
+// Actions and results (for users who want to handle actions manually)
 pub use canvas::actions::{CanvasAction, ActionResult};
-pub use canvas::state::{CanvasState, ActionContext};
+
-pub use canvas::modes::{AppMode, HighlightState, ModeManager};
+// Validation exports (only when validation feature is enabled)
+#[cfg(feature = "validation")]
+pub use validation::{
+    ValidationConfig, ValidationResult, ValidationError,
+    CharacterLimits, ValidationConfigBuilder, ValidationState,
+    ValidationSummary, PatternFilters, PositionFilter, PositionRange, CharacterFilter, 
+    DisplayMask,  // Simple display mask instead of complex ReservedCharacters
+};
+
+// Theming and GUI
+#[cfg(feature = "gui")]
+pub use canvas::theme::{CanvasTheme, DefaultCanvasTheme};
+
+#[cfg(feature = "gui")]
+pub use canvas::gui::render_canvas;
+
+#[cfg(feature = "gui")]
+pub use canvas::gui::render_canvas_default;
+
+#[cfg(all(feature = "gui", feature = "autocomplete"))]
+pub use autocomplete::gui::render_autocomplete_dropdown;

canvas/src/validation/config.rs

@@ -0,0 +1,361 @@
+// src/validation/config.rs
+//! Validation configuration types and builders
+
+use crate::validation::{CharacterLimits, PatternFilters, DisplayMask};
+
+/// Main validation configuration for a field
+#[derive(Debug, Clone, Default)]
+pub struct ValidationConfig {
+    /// Character limit configuration
+    pub character_limits: Option<CharacterLimits>,
+
+    /// Pattern filtering configuration
+    pub pattern_filters: Option<PatternFilters>,
+
+    /// User-defined display mask for visual formatting
+    pub display_mask: Option<DisplayMask>,
+
+    /// Future: Custom formatting
+    pub custom_formatting: Option<()>, // Placeholder for future implementation
+
+    /// Future: External validation
+    pub external_validation: Option<()>, // Placeholder for future implementation
+}
+
+/// Builder for creating validation configurations
+#[derive(Debug, Default)]
+pub struct ValidationConfigBuilder {
+    config: ValidationConfig,
+}
+
+impl ValidationConfigBuilder {
+    /// Create a new validation config builder
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Set character limits for the field
+    pub fn with_character_limits(mut self, limits: CharacterLimits) -> Self {
+        self.config.character_limits = Some(limits);
+        self
+    }
+
+    /// Set pattern filters for the field
+    pub fn with_pattern_filters(mut self, filters: PatternFilters) -> Self {
+        self.config.pattern_filters = Some(filters);
+        self
+    }
+
+    /// Set user-defined display mask for visual formatting
+    /// 
+    /// # Examples
+    /// ```
+    /// use canvas::{ValidationConfigBuilder, DisplayMask};
+    /// 
+    /// // Phone number with dynamic formatting
+    /// let phone_mask = DisplayMask::new("(###) ###-####", '#');
+    /// let config = ValidationConfigBuilder::new()
+    ///     .with_display_mask(phone_mask)
+    ///     .build();
+    /// 
+    /// // Date with template formatting  
+    /// let date_mask = DisplayMask::new("##/##/####", '#')
+    ///     .with_template('_');
+    /// let config = ValidationConfigBuilder::new()
+    ///     .with_display_mask(date_mask)
+    ///     .build();
+    /// 
+    /// // Custom business format
+    /// let employee_id = DisplayMask::new("EMP-####-##", '#')
+    ///     .with_template('•');
+    /// let config = ValidationConfigBuilder::new()
+    ///     .with_display_mask(employee_id)
+    ///     .with_max_length(6)  // Only store the 6 digits
+    ///     .build();
+    /// ```
+    pub fn with_display_mask(mut self, mask: DisplayMask) -> Self {
+        self.config.display_mask = Some(mask);
+        self
+    }
+
+    /// Set maximum number of characters (convenience method)
+    pub fn with_max_length(mut self, max_length: usize) -> Self {
+        self.config.character_limits = Some(CharacterLimits::new(max_length));
+        self
+    }
+
+    /// Build the final validation configuration
+    pub fn build(self) -> ValidationConfig {
+        self.config
+    }
+}
+
+/// Result of a validation operation
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum ValidationResult {
+    /// Validation passed
+    Valid,
+
+    /// Validation failed with warning (input still accepted)
+    Warning { message: String },
+
+    /// Validation failed with error (input rejected)
+    Error { message: String },
+}
+
+impl ValidationResult {
+    /// Check if the validation result allows the input
+    pub fn is_acceptable(&self) -> bool {
+        matches!(self, ValidationResult::Valid | ValidationResult::Warning { .. })
+    }
+
+    /// Check if the validation result is an error
+    pub fn is_error(&self) -> bool {
+        matches!(self, ValidationResult::Error { .. })
+    }
+
+    /// Get the message if there is one
+    pub fn message(&self) -> Option<&str> {
+        match self {
+            ValidationResult::Valid => None,
+            ValidationResult::Warning { message } => Some(message),
+            ValidationResult::Error { message } => Some(message),
+        }
+    }
+
+    /// Create a warning result
+    pub fn warning(message: impl Into<String>) -> Self {
+        ValidationResult::Warning { message: message.into() }
+    }
+
+    /// Create an error result
+    pub fn error(message: impl Into<String>) -> Self {
+        ValidationResult::Error { message: message.into() }
+    }
+}
+
+impl ValidationConfig {
+    /// Create a new empty validation configuration
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Create a configuration with just character limits
+    pub fn with_max_length(max_length: usize) -> Self {
+        ValidationConfigBuilder::new()
+            .with_max_length(max_length)
+            .build()
+    }
+
+    /// Create a configuration with pattern filters
+    pub fn with_patterns(patterns: PatternFilters) -> Self {
+        ValidationConfigBuilder::new()
+            .with_pattern_filters(patterns)
+            .build()
+    }
+
+    /// Create a configuration with user-defined display mask
+    /// 
+    /// # Examples
+    /// ```
+    /// use canvas::{ValidationConfig, DisplayMask};
+    /// 
+    /// let phone_mask = DisplayMask::new("(###) ###-####", '#');
+    /// let config = ValidationConfig::with_mask(phone_mask);
+    /// ```
+    pub fn with_mask(mask: DisplayMask) -> Self {
+        ValidationConfigBuilder::new()
+            .with_display_mask(mask)
+            .build()
+    }
+
+    /// Validate a character insertion at a specific position (raw text space).
+    ///
+    /// Note: Display masks are visual-only and do not participate in validation.
+    /// Editor logic is responsible for skipping mask separator positions; here we
+    /// only validate the raw insertion against limits and patterns.
+    pub fn validate_char_insertion(
+        &self,
+        current_text: &str,
+        position: usize,
+        character: char,
+    ) -> ValidationResult {
+        // Character limits validation
+        if let Some(ref limits) = self.character_limits {
+            if let Some(result) = limits.validate_insertion(current_text, position, character) {
+                if !result.is_acceptable() {
+                    return result;
+                }
+            }
+        }
+
+        // Pattern filters validation
+        if let Some(ref patterns) = self.pattern_filters {
+            if let Err(message) = patterns.validate_char_at_position(position, character) {
+                return ValidationResult::error(message);
+            }
+        }
+
+        // Future: Add other validation types here
+
+        ValidationResult::Valid
+    }
+
+    /// Validate the current text content (raw text space)
+    pub fn validate_content(&self, text: &str) -> ValidationResult {
+        // Character limits validation
+        if let Some(ref limits) = self.character_limits {
+            if let Some(result) = limits.validate_content(text) {
+                if !result.is_acceptable() {
+                    return result;
+                }
+            }
+        }
+
+        // Pattern filters validation
+        if let Some(ref patterns) = self.pattern_filters {
+            if let Err(message) = patterns.validate_text(text) {
+                return ValidationResult::error(message);
+            }
+        }
+
+        // Future: Add other validation types here
+
+        ValidationResult::Valid
+    }
+
+    /// Check if any validation rules are configured
+    pub fn has_validation(&self) -> bool {
+        self.character_limits.is_some() 
+            || self.pattern_filters.is_some() 
+            || self.display_mask.is_some()
+    }
+
+    pub fn allows_field_switch(&self, text: &str) -> bool {
+        // Character limits validation
+        if let Some(ref limits) = self.character_limits {
+            if !limits.allows_field_switch(text) {
+                return false;
+            }
+        }
+
+        // Future: Add other validation types here
+
+        true
+    }
+
+    /// Get reason why field switching is blocked (if any)
+    pub fn field_switch_block_reason(&self, text: &str) -> Option<String> {
+        // Character limits validation
+        if let Some(ref limits) = self.character_limits {
+            if let Some(reason) = limits.field_switch_block_reason(text) {
+                return Some(reason);
+            }
+        }
+
+        // Future: Add other validation types here
+
+        None
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_config_with_user_defined_mask() {
+        // User creates their own phone mask
+        let phone_mask = DisplayMask::new("(###) ###-####", '#');
+        let config = ValidationConfig::with_mask(phone_mask);
+        
+        // has_validation should be true because mask is configured
+        assert!(config.has_validation());
+
+        // Display mask is visual only; validation still focuses on raw content
+        let result = config.validate_char_insertion("123", 3, '4');
+        assert!(result.is_acceptable());
+
+        // Content validation unaffected by mask
+        let result = config.validate_content("1234567890");
+        assert!(result.is_acceptable());
+    }
+
+    #[test]
+    fn test_validation_config_builder() {
+        let config = ValidationConfigBuilder::new()
+            .with_max_length(10)
+            .build();
+
+        assert!(config.character_limits.is_some());
+        assert_eq!(config.character_limits.unwrap().max_length(), Some(10));
+    }
+
+    #[test]
+    fn test_config_builder_with_user_mask() {
+        // User defines custom format
+        let custom_mask = DisplayMask::new("##-##-##", '#').with_template('_');
+        let config = ValidationConfigBuilder::new()
+            .with_display_mask(custom_mask)
+            .with_max_length(6)
+            .build();
+
+        assert!(config.has_validation());
+        assert!(config.character_limits.is_some());
+        assert!(config.display_mask.is_some());
+    }
+
+    #[test]
+    fn test_validation_result() {
+        let valid = ValidationResult::Valid;
+        assert!(valid.is_acceptable());
+        assert!(!valid.is_error());
+        assert_eq!(valid.message(), None);
+
+        let warning = ValidationResult::warning("Too long");
+        assert!(warning.is_acceptable());
+        assert!(!warning.is_error());
+        assert_eq!(warning.message(), Some("Too long"));
+
+        let error = ValidationResult::error("Invalid");
+        assert!(!error.is_acceptable());
+        assert!(error.is_error());
+        assert_eq!(error.message(), Some("Invalid"));
+    }
+
+    #[test]
+    fn test_config_with_max_length() {
+        let config = ValidationConfig::with_max_length(5);
+        assert!(config.has_validation());
+
+        // Test valid insertion
+        let result = config.validate_char_insertion("test", 4, 'x');
+        assert!(result.is_acceptable());
+
+        // Test invalid insertion (would exceed limit)
+        let result = config.validate_char_insertion("tests", 5, 'x');
+        assert!(!result.is_acceptable());
+    }
+
+    #[test]
+    fn test_config_with_patterns() {
+        use crate::validation::{PatternFilters, PositionFilter, PositionRange, CharacterFilter};
+
+        let patterns = PatternFilters::new()
+            .add_filter(PositionFilter::new(
+                PositionRange::Range(0, 1),
+                CharacterFilter::Alphabetic,
+            ));
+
+        let config = ValidationConfig::with_patterns(patterns);
+        assert!(config.has_validation());
+
+        // Test valid pattern insertion
+        let result = config.validate_char_insertion("", 0, 'A');
+        assert!(result.is_acceptable());
+
+        // Test invalid pattern insertion
+        let result = config.validate_char_insertion("", 0, '1');
+        assert!(!result.is_acceptable());
+    }
+}

canvas/src/validation/limits.rs

@@ -0,0 +1,424 @@
+// src/validation/limits.rs
+//! Character limits validation implementation
+
+use crate::validation::ValidationResult;
+use serde::{Deserialize, Serialize};
+use unicode_width::UnicodeWidthStr;
+
+/// Character limits configuration for a field
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CharacterLimits {
+    /// Maximum number of characters allowed (None = unlimited)
+    max_length: Option<usize>,
+    
+    /// Minimum number of characters required (None = no minimum)
+    min_length: Option<usize>,
+    
+    /// Warning threshold (warn when approaching max limit)
+    warning_threshold: Option<usize>,
+    
+    /// Count mode: characters vs display width
+    count_mode: CountMode,
+}
+
+/// How to count characters for limit checking
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum CountMode {
+    /// Count actual characters (default)
+    Characters,
+    
+    /// Count display width (useful for CJK characters)
+    DisplayWidth,
+    
+    /// Count bytes (rarely used, but available)
+    Bytes,
+}
+
+impl Default for CountMode {
+    fn default() -> Self {
+        CountMode::Characters
+    }
+}
+
+/// Result of a character limit check
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum LimitCheckResult {
+    /// Within limits
+    Ok,
+    
+    /// Approaching limit (warning)
+    Warning { current: usize, max: usize },
+    
+    /// At or exceeding limit (error)
+    Exceeded { current: usize, max: usize },
+    
+    /// Below minimum length
+    TooShort { current: usize, min: usize },
+}
+
+impl CharacterLimits {
+    /// Create new character limits with just max length
+    pub fn new(max_length: usize) -> Self {
+        Self {
+            max_length: Some(max_length),
+            min_length: None,
+            warning_threshold: None,
+            count_mode: CountMode::default(),
+        }
+    }
+    
+    /// Create new character limits with min and max
+    pub fn new_range(min_length: usize, max_length: usize) -> Self {
+        Self {
+            max_length: Some(max_length),
+            min_length: Some(min_length),
+            warning_threshold: None,
+            count_mode: CountMode::default(),
+        }
+    }
+    
+    /// Set warning threshold (when to show warning before hitting limit)
+    pub fn with_warning_threshold(mut self, threshold: usize) -> Self {
+        self.warning_threshold = Some(threshold);
+        self
+    }
+    
+    /// Set count mode (characters vs display width vs bytes)
+    pub fn with_count_mode(mut self, mode: CountMode) -> Self {
+        self.count_mode = mode;
+        self
+    }
+    
+    /// Get maximum length
+    pub fn max_length(&self) -> Option<usize> {
+        self.max_length
+    }
+    
+    /// Get minimum length
+    pub fn min_length(&self) -> Option<usize> {
+        self.min_length
+    }
+    
+    /// Get warning threshold
+    pub fn warning_threshold(&self) -> Option<usize> {
+        self.warning_threshold
+    }
+    
+    /// Get count mode
+    pub fn count_mode(&self) -> CountMode {
+        self.count_mode
+    }
+    
+    /// Count characters/width/bytes according to the configured mode
+    fn count(&self, text: &str) -> usize {
+        match self.count_mode {
+            CountMode::Characters => text.chars().count(),
+            CountMode::DisplayWidth => text.width(),
+            CountMode::Bytes => text.len(),
+        }
+    }
+    
+    /// Check if inserting a character would exceed limits
+    pub fn validate_insertion(
+        &self,
+        current_text: &str,
+        _position: usize,
+        character: char,
+    ) -> Option<ValidationResult> {
+        let current_count = self.count(current_text);
+        let char_count = match self.count_mode {
+            CountMode::Characters => 1,
+            CountMode::DisplayWidth => {
+                let char_str = character.to_string();
+                char_str.width()
+            },
+            CountMode::Bytes => character.len_utf8(),
+        };
+        let new_count = current_count + char_count;
+        
+        // Check max length
+        if let Some(max) = self.max_length {
+            if new_count > max {
+                return Some(ValidationResult::error(format!(
+                    "Character limit exceeded: {}/{}", 
+                    new_count, 
+                    max
+                )));
+            }
+            
+            // Check warning threshold
+            if let Some(warning_threshold) = self.warning_threshold {
+                if new_count >= warning_threshold && current_count < warning_threshold {
+                    return Some(ValidationResult::warning(format!(
+                        "Approaching character limit: {}/{}", 
+                        new_count, 
+                        max
+                    )));
+                }
+            }
+        }
+        
+        None // No validation issues
+    }
+    
+    /// Validate the current content
+    pub fn validate_content(&self, text: &str) -> Option<ValidationResult> {
+        let count = self.count(text);
+        
+        // Check minimum length
+        if let Some(min) = self.min_length {
+            if count < min {
+                return Some(ValidationResult::warning(format!(
+                    "Minimum length not met: {}/{}", 
+                    count, 
+                    min
+                )));
+            }
+        }
+        
+        // Check maximum length
+        if let Some(max) = self.max_length {
+            if count > max {
+                return Some(ValidationResult::error(format!(
+                    "Character limit exceeded: {}/{}", 
+                    count, 
+                    max
+                )));
+            }
+            
+            // Check warning threshold
+            if let Some(warning_threshold) = self.warning_threshold {
+                if count >= warning_threshold {
+                    return Some(ValidationResult::warning(format!(
+                        "Approaching character limit: {}/{}", 
+                        count, 
+                        max
+                    )));
+                }
+            }
+        }
+        
+        None // No validation issues
+    }
+    
+    /// Get the current status of the text against limits
+    pub fn check_limits(&self, text: &str) -> LimitCheckResult {
+        let count = self.count(text);
+        
+        // Check max length first
+        if let Some(max) = self.max_length {
+            if count > max {
+                return LimitCheckResult::Exceeded { current: count, max };
+            }
+            
+            // Check warning threshold
+            if let Some(warning_threshold) = self.warning_threshold {
+                if count >= warning_threshold {
+                    return LimitCheckResult::Warning { current: count, max };
+                }
+            }
+        }
+        
+        // Check min length
+        if let Some(min) = self.min_length {
+            if count < min {
+                return LimitCheckResult::TooShort { current: count, min };
+            }
+        }
+        
+        LimitCheckResult::Ok
+    }
+    
+    /// Get a human-readable status string
+    pub fn status_text(&self, text: &str) -> Option<String> {
+        match self.check_limits(text) {
+            LimitCheckResult::Ok => {
+                // Show current/max if we have a max limit
+                if let Some(max) = self.max_length {
+                    Some(format!("{}/{}", self.count(text), max))
+                } else {
+                    None
+                }
+            },
+            LimitCheckResult::Warning { current, max } => {
+                Some(format!("{}/{} (approaching limit)", current, max))
+            },
+            LimitCheckResult::Exceeded { current, max } => {
+                Some(format!("{}/{} (exceeded)", current, max))
+            },
+            LimitCheckResult::TooShort { current, min } => {
+                Some(format!("{}/{} minimum", current, min))
+            },
+        }
+    }
+    pub fn allows_field_switch(&self, text: &str) -> bool {
+        if let Some(min) = self.min_length {
+            let count = self.count(text);
+            // Allow switching if field is empty OR meets minimum requirement
+            count == 0 || count >= min
+        } else {
+            true // No minimum requirement, always allow switching
+        }
+    }
+    
+    /// Get reason why field switching is not allowed (if any)
+    pub fn field_switch_block_reason(&self, text: &str) -> Option<String> {
+        if let Some(min) = self.min_length {
+            let count = self.count(text);
+            if count > 0 && count < min {
+                return Some(format!(
+                    "Field must be empty or have at least {} characters (currently: {})",
+                    min, count
+                ));
+            }
+        }
+        None
+    }
+}
+
+impl Default for CharacterLimits {
+    fn default() -> Self {
+        Self {
+            max_length: Some(30), // Default 30 character limit as specified
+            min_length: None,
+            warning_threshold: None,
+            count_mode: CountMode::default(),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_character_limits_creation() {
+        let limits = CharacterLimits::new(10);
+        assert_eq!(limits.max_length(), Some(10));
+        assert_eq!(limits.min_length(), None);
+        
+        let range_limits = CharacterLimits::new_range(5, 15);
+        assert_eq!(range_limits.min_length(), Some(5));
+        assert_eq!(range_limits.max_length(), Some(15));
+    }
+    
+    #[test]
+    fn test_default_limits() {
+        let limits = CharacterLimits::default();
+        assert_eq!(limits.max_length(), Some(30));
+    }
+    
+    #[test]
+    fn test_character_counting() {
+        let limits = CharacterLimits::new(5);
+        
+        // Test character mode (default)
+        assert_eq!(limits.count("hello"), 5);
+        assert_eq!(limits.count("héllo"), 5); // Accented character counts as 1
+        
+        // Test display width mode
+        let limits = limits.with_count_mode(CountMode::DisplayWidth);
+        assert_eq!(limits.count("hello"), 5);
+        
+        // Test bytes mode
+        let limits = limits.with_count_mode(CountMode::Bytes);
+        assert_eq!(limits.count("hello"), 5);
+        assert_eq!(limits.count("héllo"), 6); // é takes 2 bytes in UTF-8
+    }
+    
+    #[test]
+    fn test_insertion_validation() {
+        let limits = CharacterLimits::new(5);
+        
+        // Valid insertion
+        let result = limits.validate_insertion("test", 4, 'x');
+        assert!(result.is_none()); // No validation issues
+        
+        // Invalid insertion (would exceed limit)
+        let result = limits.validate_insertion("tests", 5, 'x');
+        assert!(result.is_some());
+        assert!(!result.unwrap().is_acceptable());
+    }
+    
+    #[test]
+    fn test_content_validation() {
+        let limits = CharacterLimits::new_range(3, 10);
+        
+        // Too short
+        let result = limits.validate_content("hi");
+        assert!(result.is_some());
+        assert!(result.unwrap().is_acceptable()); // Warning, not error
+        
+        // Just right
+        let result = limits.validate_content("hello");
+        assert!(result.is_none());
+        
+        // Too long
+        let result = limits.validate_content("hello world!");
+        assert!(result.is_some());
+        assert!(!result.unwrap().is_acceptable()); // Error
+    }
+    
+    #[test]
+    fn test_warning_threshold() {
+        let limits = CharacterLimits::new(10).with_warning_threshold(8);
+        
+        // Below warning threshold
+        let result = limits.validate_insertion("1234567", 7, 'x');
+        assert!(result.is_none());
+        
+        // At warning threshold
+        let result = limits.validate_insertion("1234567", 7, 'x');
+        assert!(result.is_none()); // This brings us to 8 chars
+        
+        let result = limits.validate_insertion("12345678", 8, 'x');
+        assert!(result.is_some());
+        assert!(result.unwrap().is_acceptable()); // Warning, not error
+    }
+    
+    #[test]
+    fn test_status_text() {
+        let limits = CharacterLimits::new(10);
+        
+        assert_eq!(limits.status_text("hello"), Some("5/10".to_string()));
+        
+        let limits = limits.with_warning_threshold(8);
+        assert_eq!(limits.status_text("12345678"), Some("8/10 (approaching limit)".to_string()));
+        assert_eq!(limits.status_text("1234567890x"), Some("11/10 (exceeded)".to_string()));
+    }
+    
+    #[test]
+    fn test_field_switch_blocking() {
+        let limits = CharacterLimits::new_range(3, 10);
+        
+        // Empty field: should allow switching
+        assert!(limits.allows_field_switch(""));
+        assert!(limits.field_switch_block_reason("").is_none());
+        
+        // Field with content below minimum: should block switching
+        assert!(!limits.allows_field_switch("hi"));
+        assert!(limits.field_switch_block_reason("hi").is_some());
+        assert!(limits.field_switch_block_reason("hi").unwrap().contains("at least 3 characters"));
+        
+        // Field meeting minimum: should allow switching
+        assert!(limits.allows_field_switch("hello"));
+        assert!(limits.field_switch_block_reason("hello").is_none());
+        
+        // Field exceeding maximum: should still allow switching (validation shows error but doesn't block)
+        assert!(limits.allows_field_switch("this is way too long"));
+        assert!(limits.field_switch_block_reason("this is way too long").is_none());
+    }
+    
+    #[test]
+    fn test_field_switch_no_minimum() {
+        let limits = CharacterLimits::new(10); // Only max, no minimum
+        
+        // Should always allow switching when there's no minimum
+        assert!(limits.allows_field_switch(""));
+        assert!(limits.allows_field_switch("a"));
+        assert!(limits.allows_field_switch("hello"));
+        
+        assert!(limits.field_switch_block_reason("").is_none());
+        assert!(limits.field_switch_block_reason("a").is_none());
+    }
+}

canvas/src/validation/mask.rs

@@ -0,0 +1,333 @@
+// src/validation/mask.rs
+//! Pure display mask system - user-defined patterns only
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum MaskDisplayMode {
+    /// Only show separators as user types
+    /// Example: "" → "", "123" → "123", "12345" → "(123) 45"
+    Dynamic,
+    
+    /// Show full template with placeholders from start
+    /// Example: "" → "(___) ___-____", "123" → "(123) ___-____"
+    Template { 
+        /// Character to use as placeholder for empty input positions
+        placeholder: char 
+    },
+}
+
+impl Default for MaskDisplayMode {
+    fn default() -> Self {
+        MaskDisplayMode::Dynamic
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct DisplayMask {
+    /// Mask pattern like "##-##-####" where # = input position, others are visual separators
+    pattern: String,
+    /// Character used to represent input positions (usually '#')
+    input_char: char,
+    /// How to display the mask (dynamic vs template)
+    display_mode: MaskDisplayMode,
+}
+
+impl DisplayMask {
+    /// Create a new display mask with dynamic mode (current behavior)
+    /// 
+    /// # Arguments
+    /// * `pattern` - The mask pattern (e.g., "##-##-####", "(###) ###-####")  
+    /// * `input_char` - Character representing input positions (usually '#')
+    /// 
+    /// # Examples
+    /// ```
+    /// // Phone number format
+    /// let phone_mask = DisplayMask::new("(###) ###-####", '#');
+    /// 
+    /// // Date format  
+    /// let date_mask = DisplayMask::new("##/##/####", '#');
+    /// 
+    /// // Custom business format
+    /// let employee_id = DisplayMask::new("EMP-####-##", '#');
+    /// ```
+    pub fn new(pattern: impl Into<String>, input_char: char) -> Self {
+        Self {
+            pattern: pattern.into(),
+            input_char,
+            display_mode: MaskDisplayMode::Dynamic,
+        }
+    }
+
+    /// Set the display mode for this mask
+    /// 
+    /// # Examples
+    /// ```
+    /// let dynamic_mask = DisplayMask::new("##-##", '#')
+    ///     .with_mode(MaskDisplayMode::Dynamic);
+    ///     
+    /// let template_mask = DisplayMask::new("##-##", '#')
+    ///     .with_mode(MaskDisplayMode::Template { placeholder: '_' });
+    /// ```
+    pub fn with_mode(mut self, mode: MaskDisplayMode) -> Self {
+        self.display_mode = mode;
+        self
+    }
+
+    /// Set template mode with custom placeholder
+    /// 
+    /// # Examples
+    /// ```
+    /// let phone_template = DisplayMask::new("(###) ###-####", '#')
+    ///     .with_template('_');  // Shows "(___) ___-____" when empty
+    ///     
+    /// let date_dots = DisplayMask::new("##/##/####", '#')
+    ///     .with_template('•');  // Shows "••/••/••••" when empty
+    /// ```
+    pub fn with_template(self, placeholder: char) -> Self {
+        self.with_mode(MaskDisplayMode::Template { placeholder })
+    }
+
+    /// Apply mask to raw input, showing visual separators and handling display mode
+    pub fn apply_to_display(&self, raw_input: &str) -> String {
+        match &self.display_mode {
+            MaskDisplayMode::Dynamic => self.apply_dynamic(raw_input),
+            MaskDisplayMode::Template { placeholder } => self.apply_template(raw_input, *placeholder),
+        }
+    }
+
+    /// Dynamic mode - only show separators as user types
+    fn apply_dynamic(&self, raw_input: &str) -> String {
+        let mut result = String::new();
+        let mut raw_chars = raw_input.chars();
+
+        for pattern_char in self.pattern.chars() {
+            if pattern_char == self.input_char {
+                // Input position - take from raw input
+                if let Some(input_char) = raw_chars.next() {
+                    result.push(input_char);
+                } else {
+                    // No more input - stop here in dynamic mode
+                    break;
+                }
+            } else {
+                // Visual separator - always show
+                result.push(pattern_char);
+            }
+        }
+
+        // Append any remaining raw characters that don't fit the pattern
+        for remaining_char in raw_chars {
+            result.push(remaining_char);
+        }
+
+        result
+    }
+
+    /// Template mode - show full pattern with placeholders
+    fn apply_template(&self, raw_input: &str, placeholder: char) -> String {
+        let mut result = String::new();
+        let mut raw_chars = raw_input.chars().peekable();
+
+        for pattern_char in self.pattern.chars() {
+            if pattern_char == self.input_char {
+                // Input position - take from raw input or use placeholder
+                if let Some(input_char) = raw_chars.next() {
+                    result.push(input_char);
+                } else {
+                    // No more input - use placeholder to show template
+                    result.push(placeholder);
+                }
+            } else {
+                // Visual separator - always show in template mode
+                result.push(pattern_char);
+            }
+        }
+
+        // In template mode, we don't append extra characters beyond the pattern
+        // This keeps the template consistent
+        result
+    }
+
+    /// Check if a display position should accept cursor/input
+    pub fn is_input_position(&self, display_position: usize) -> bool {
+        self.pattern.chars()
+            .nth(display_position)
+            .map(|c| c == self.input_char)
+            .unwrap_or(true) // Beyond pattern = accept input
+    }
+
+    /// Map display position to raw position
+    pub fn display_pos_to_raw_pos(&self, display_pos: usize) -> usize {
+        let mut raw_pos = 0;
+
+        for (i, pattern_char) in self.pattern.chars().enumerate() {
+            if i >= display_pos {
+                break;
+            }
+            if pattern_char == self.input_char {
+                raw_pos += 1;
+            }
+        }
+
+        raw_pos
+    }
+
+    /// Map raw position to display position
+    pub fn raw_pos_to_display_pos(&self, raw_pos: usize) -> usize {
+        let mut input_positions_seen = 0;
+
+        for (display_pos, pattern_char) in self.pattern.chars().enumerate() {
+            if pattern_char == self.input_char {
+                if input_positions_seen == raw_pos {
+                    return display_pos;
+                }
+                input_positions_seen += 1;
+            }
+        }
+
+        // Beyond pattern, return position after pattern
+        self.pattern.len() + (raw_pos - input_positions_seen)
+    }
+
+    /// Find next input position at or after the given display position
+    pub fn next_input_position(&self, display_pos: usize) -> usize {
+        for (i, pattern_char) in self.pattern.chars().enumerate().skip(display_pos) {
+            if pattern_char == self.input_char {
+                return i;
+            }
+        }
+        // Beyond pattern = all positions are input positions
+        display_pos.max(self.pattern.len())
+    }
+
+    /// Find previous input position at or before the given display position
+    pub fn prev_input_position(&self, display_pos: usize) -> Option<usize> {
+        // Collect pattern chars with indices first, then search backwards
+        let pattern_chars: Vec<(usize, char)> = self.pattern.chars().enumerate().collect();
+        
+        // Search backwards from display_pos
+        for &(i, pattern_char) in pattern_chars.iter().rev() {
+            if i <= display_pos && pattern_char == self.input_char {
+                return Some(i);
+            }
+        }
+        None
+    }
+
+    /// Get the display mode
+    pub fn display_mode(&self) -> &MaskDisplayMode {
+        &self.display_mode
+    }
+
+    /// Check if this mask uses template mode
+    pub fn is_template_mode(&self) -> bool {
+        matches!(self.display_mode, MaskDisplayMode::Template { .. })
+    }
+
+    /// Get the pattern string
+    pub fn pattern(&self) -> &str {
+        &self.pattern
+    }
+
+    /// Get the position of the first input character in the pattern
+    pub fn first_input_position(&self) -> usize {
+        for (pos, ch) in self.pattern.chars().enumerate() {
+            if ch == self.input_char {
+                return pos;
+            }
+        }
+        0
+    }
+}
+
+impl Default for DisplayMask {
+    fn default() -> Self {
+        Self::new("", '#')
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_user_defined_phone_mask() {
+        // User creates their own phone mask
+        let dynamic = DisplayMask::new("(###) ###-####", '#');
+        let template = DisplayMask::new("(###) ###-####", '#').with_template('_');
+        
+        // Dynamic mode
+        assert_eq!(dynamic.apply_to_display(""), "");
+        assert_eq!(dynamic.apply_to_display("1234567890"), "(123) 456-7890");
+        
+        // Template mode
+        assert_eq!(template.apply_to_display(""), "(___) ___-____");
+        assert_eq!(template.apply_to_display("123"), "(123) ___-____");
+    }
+
+    #[test]
+    fn test_user_defined_date_mask() {
+        // User creates their own date formats
+        let us_date = DisplayMask::new("##/##/####", '#');
+        let eu_date = DisplayMask::new("##.##.####", '#');
+        let iso_date = DisplayMask::new("####-##-##", '#');
+        
+        assert_eq!(us_date.apply_to_display("12252024"), "12/25/2024");
+        assert_eq!(eu_date.apply_to_display("25122024"), "25.12.2024");
+        assert_eq!(iso_date.apply_to_display("20241225"), "2024-12-25");
+    }
+
+    #[test]
+    fn test_user_defined_business_formats() {
+        // User creates custom business formats
+        let employee_id = DisplayMask::new("EMP-####-##", '#');
+        let product_code = DisplayMask::new("###-###-###", '#');
+        let invoice = DisplayMask::new("INV####/##", '#');
+        
+        assert_eq!(employee_id.apply_to_display("123456"), "EMP-1234-56");
+        assert_eq!(product_code.apply_to_display("123456789"), "123-456-789");
+        assert_eq!(invoice.apply_to_display("123456"), "INV1234/56");
+    }
+
+    #[test]
+    fn test_custom_input_characters() {
+        // User can define their own input character
+        let mask_with_x = DisplayMask::new("XXX-XX-XXXX", 'X');
+        let mask_with_hash = DisplayMask::new("###-##-####", '#');
+        let mask_with_n = DisplayMask::new("NNN-NN-NNNN", 'N');
+        
+        assert_eq!(mask_with_x.apply_to_display("123456789"), "123-45-6789");
+        assert_eq!(mask_with_hash.apply_to_display("123456789"), "123-45-6789");
+        assert_eq!(mask_with_n.apply_to_display("123456789"), "123-45-6789");
+    }
+
+    #[test]
+    fn test_custom_placeholders() {
+        // User can define custom placeholder characters
+        let underscores = DisplayMask::new("##-##", '#').with_template('_');
+        let dots = DisplayMask::new("##-##", '#').with_template('•');
+        let dashes = DisplayMask::new("##-##", '#').with_template('-');
+        
+        assert_eq!(underscores.apply_to_display(""), "__-__");
+        assert_eq!(dots.apply_to_display(""), "••-••");
+        assert_eq!(dashes.apply_to_display(""), "---");  // Note: dashes blend with separator
+    }
+
+    #[test]
+    fn test_position_mapping_user_patterns() {
+        let custom = DisplayMask::new("ABC-###-XYZ", '#');
+        
+        // Position mapping should work correctly with any pattern
+        assert_eq!(custom.raw_pos_to_display_pos(0), 4); // First # at position 4
+        assert_eq!(custom.raw_pos_to_display_pos(1), 5); // Second # at position 5
+        assert_eq!(custom.raw_pos_to_display_pos(2), 6); // Third # at position 6
+        
+        assert_eq!(custom.display_pos_to_raw_pos(4), 0); // Position 4 -> first input
+        assert_eq!(custom.display_pos_to_raw_pos(5), 1); // Position 5 -> second input
+        assert_eq!(custom.display_pos_to_raw_pos(6), 2); // Position 6 -> third input
+        
+        assert!(!custom.is_input_position(0)); // A
+        assert!(!custom.is_input_position(3)); // -
+        assert!(custom.is_input_position(4));  // #
+        assert!(!custom.is_input_position(8)); // Y
+    }
+}

canvas/src/validation/mod.rs

@@ -0,0 +1,28 @@
+// src/validation/mod.rs
+
+// Core validation modules
+pub mod config;
+pub mod limits;
+pub mod state;
+pub mod patterns;
+pub mod mask;  // Simple display mask instead of complex reserved chars
+
+// Re-export main types
+pub use config::{ValidationConfig, ValidationResult, ValidationConfigBuilder};
+pub use limits::{CharacterLimits, LimitCheckResult};
+pub use state::{ValidationState, ValidationSummary};
+pub use patterns::{PatternFilters, PositionFilter, PositionRange, CharacterFilter};
+pub use mask::DisplayMask;  // Simple mask instead of ReservedCharacters
+
+/// Validation error types
+#[derive(Debug, Clone, thiserror::Error)]
+pub enum ValidationError {
+    #[error("Character limit exceeded: {message}")]
+    LimitExceeded { message: String },
+    
+    #[error("Pattern validation failed: {message}")]
+    PatternFailed { message: String },
+    
+    #[error("Custom validation failed: {message}")]
+    CustomFailed { message: String },
+}

canvas/src/validation/patterns.rs

@@ -0,0 +1,326 @@
+// src/validation/patterns.rs
+//! Position-based pattern filtering for validation
+
+use serde::{Deserialize, Serialize};
+use std::sync::Arc;
+
+/// A filter that applies to specific character positions in a field
+#[derive(Debug, Clone)]
+pub struct PositionFilter {
+    /// Which positions this filter applies to
+    pub positions: PositionRange,
+    /// What type of character filter to apply
+    pub filter: CharacterFilter,
+}
+
+/// Defines which character positions a filter applies to
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum PositionRange {
+    /// Single position (e.g., position 3 only)
+    Single(usize),
+    /// Range of positions (e.g., positions 0-2, inclusive)
+    Range(usize, usize),
+    /// From position onwards (e.g., position 4 and beyond)
+    From(usize),
+    /// Multiple specific positions (e.g., positions 0, 2, 5)
+    Multiple(Vec<usize>),
+}
+
+/// Types of character filters that can be applied
+pub enum CharacterFilter {
+    /// Allow only alphabetic characters (a-z, A-Z)
+    Alphabetic,
+    /// Allow only numeric characters (0-9)
+    Numeric,
+    /// Allow alphanumeric characters (a-z, A-Z, 0-9)
+    Alphanumeric,
+    /// Allow only exact character match
+    Exact(char),
+    /// Allow any character from the provided set
+    OneOf(Vec<char>),
+    /// Custom user-defined filter function
+    Custom(Arc<dyn Fn(char) -> bool + Send + Sync>),
+}
+
+// Manual implementations for Debug and Clone
+impl std::fmt::Debug for CharacterFilter {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            CharacterFilter::Alphabetic => write!(f, "Alphabetic"),
+            CharacterFilter::Numeric => write!(f, "Numeric"),
+            CharacterFilter::Alphanumeric => write!(f, "Alphanumeric"),
+            CharacterFilter::Exact(ch) => write!(f, "Exact('{}')", ch),
+            CharacterFilter::OneOf(chars) => write!(f, "OneOf({:?})", chars),
+            CharacterFilter::Custom(_) => write!(f, "Custom(<function>)"),
+        }
+    }
+}
+
+impl Clone for CharacterFilter {
+    fn clone(&self) -> Self {
+        match self {
+            CharacterFilter::Alphabetic => CharacterFilter::Alphabetic,
+            CharacterFilter::Numeric => CharacterFilter::Numeric,
+            CharacterFilter::Alphanumeric => CharacterFilter::Alphanumeric,
+            CharacterFilter::Exact(ch) => CharacterFilter::Exact(*ch),
+            CharacterFilter::OneOf(chars) => CharacterFilter::OneOf(chars.clone()),
+            CharacterFilter::Custom(func) => CharacterFilter::Custom(Arc::clone(func)),
+        }
+    }
+}
+
+impl PositionRange {
+    /// Check if a position is included in this range
+    pub fn contains(&self, position: usize) -> bool {
+        match self {
+            PositionRange::Single(pos) => position == *pos,
+            PositionRange::Range(start, end) => position >= *start && position <= *end,
+            PositionRange::From(start) => position >= *start,
+            PositionRange::Multiple(positions) => positions.contains(&position),
+        }
+    }
+
+    /// Get all positions up to a given length that this range covers
+    pub fn positions_up_to(&self, max_length: usize) -> Vec<usize> {
+        match self {
+            PositionRange::Single(pos) => {
+                if *pos < max_length { vec![*pos] } else { vec![] }
+            },
+            PositionRange::Range(start, end) => {
+                let actual_end = (*end).min(max_length.saturating_sub(1));
+                if *start <= actual_end {
+                    (*start..=actual_end).collect()
+                } else {
+                    vec![]
+                }
+            },
+            PositionRange::From(start) => {
+                if *start < max_length {
+                    (*start..max_length).collect()
+                } else {
+                    vec![]
+                }
+            },
+            PositionRange::Multiple(positions) => {
+                positions.iter()
+                    .filter(|&&pos| pos < max_length)
+                    .copied()
+                    .collect()
+            },
+        }
+    }
+}
+
+impl CharacterFilter {
+    /// Test if a character passes this filter
+    pub fn accepts(&self, ch: char) -> bool {
+        match self {
+            CharacterFilter::Alphabetic => ch.is_alphabetic(),
+            CharacterFilter::Numeric => ch.is_numeric(),
+            CharacterFilter::Alphanumeric => ch.is_alphanumeric(),
+            CharacterFilter::Exact(expected) => ch == *expected,
+            CharacterFilter::OneOf(chars) => chars.contains(&ch),
+            CharacterFilter::Custom(func) => func(ch),
+        }
+    }
+
+    /// Get a human-readable description of this filter
+    pub fn description(&self) -> String {
+        match self {
+            CharacterFilter::Alphabetic => "alphabetic characters (a-z, A-Z)".to_string(),
+            CharacterFilter::Numeric => "numeric characters (0-9)".to_string(),
+            CharacterFilter::Alphanumeric => "alphanumeric characters (a-z, A-Z, 0-9)".to_string(),
+            CharacterFilter::Exact(ch) => format!("exactly '{}'", ch),
+            CharacterFilter::OneOf(chars) => {
+                let char_list: String = chars.iter().collect();
+                format!("one of: {}", char_list)
+            },
+            CharacterFilter::Custom(_) => "custom filter".to_string(),
+        }
+    }
+}
+
+impl PositionFilter {
+    /// Create a new position filter
+    pub fn new(positions: PositionRange, filter: CharacterFilter) -> Self {
+        Self { positions, filter }
+    }
+
+    /// Validate a character at a specific position
+    pub fn validate_position(&self, position: usize, character: char) -> bool {
+        if self.positions.contains(position) {
+            self.filter.accepts(character)
+        } else {
+            true // Position not covered by this filter, allow any character
+        }
+    }
+
+    /// Get error message for invalid character at position
+    pub fn error_message(&self, position: usize, character: char) -> Option<String> {
+        if self.positions.contains(position) && !self.filter.accepts(character) {
+            Some(format!(
+                "Position {} requires {} but got '{}'",
+                position,
+                self.filter.description(),
+                character
+            ))
+        } else {
+            None
+        }
+    }
+}
+
+/// A collection of position filters for a field
+#[derive(Debug, Clone, Default)]
+pub struct PatternFilters {
+    filters: Vec<PositionFilter>,
+}
+
+impl PatternFilters {
+    /// Create empty pattern filters
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Add a position filter
+    pub fn add_filter(mut self, filter: PositionFilter) -> Self {
+        self.filters.push(filter);
+        self
+    }
+
+    /// Add multiple filters
+    pub fn add_filters(mut self, filters: Vec<PositionFilter>) -> Self {
+        self.filters.extend(filters);
+        self
+    }
+
+    /// Validate a character at a specific position against all applicable filters
+    pub fn validate_char_at_position(&self, position: usize, character: char) -> Result<(), String> {
+        for filter in &self.filters {
+            if let Some(error) = filter.error_message(position, character) {
+                return Err(error);
+            }
+        }
+        Ok(())
+    }
+
+    /// Validate entire text against all filters
+    pub fn validate_text(&self, text: &str) -> Result<(), String> {
+        for (position, character) in text.char_indices() {
+            if let Err(error) = self.validate_char_at_position(position, character) {
+                return Err(error);
+            }
+        }
+        Ok(())
+    }
+
+    /// Check if any filters are configured
+    pub fn has_filters(&self) -> bool {
+        !self.filters.is_empty()
+    }
+
+    /// Get all configured filters
+    pub fn filters(&self) -> &[PositionFilter] {
+        &self.filters
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_position_range_contains() {
+        assert!(PositionRange::Single(3).contains(3));
+        assert!(!PositionRange::Single(3).contains(2));
+
+        assert!(PositionRange::Range(1, 4).contains(3));
+        assert!(!PositionRange::Range(1, 4).contains(5));
+
+        assert!(PositionRange::From(2).contains(5));
+        assert!(!PositionRange::From(2).contains(1));
+
+        assert!(PositionRange::Multiple(vec![0, 2, 5]).contains(2));
+        assert!(!PositionRange::Multiple(vec![0, 2, 5]).contains(3));
+    }
+
+    #[test]
+    fn test_position_range_positions_up_to() {
+        assert_eq!(PositionRange::Single(3).positions_up_to(5), vec![3]);
+        assert_eq!(PositionRange::Single(5).positions_up_to(3), vec![]);
+
+        assert_eq!(PositionRange::Range(1, 3).positions_up_to(5), vec![1, 2, 3]);
+        assert_eq!(PositionRange::Range(1, 5).positions_up_to(3), vec![1, 2]);
+
+        assert_eq!(PositionRange::From(2).positions_up_to(5), vec![2, 3, 4]);
+
+        assert_eq!(PositionRange::Multiple(vec![0, 2, 5]).positions_up_to(4), vec![0, 2]);
+    }
+
+    #[test]
+    fn test_character_filter_accepts() {
+        assert!(CharacterFilter::Alphabetic.accepts('a'));
+        assert!(CharacterFilter::Alphabetic.accepts('Z'));
+        assert!(!CharacterFilter::Alphabetic.accepts('1'));
+
+        assert!(CharacterFilter::Numeric.accepts('5'));
+        assert!(!CharacterFilter::Numeric.accepts('a'));
+
+        assert!(CharacterFilter::Alphanumeric.accepts('a'));
+        assert!(CharacterFilter::Alphanumeric.accepts('5'));
+        assert!(!CharacterFilter::Alphanumeric.accepts('-'));
+
+        assert!(CharacterFilter::Exact('x').accepts('x'));
+        assert!(!CharacterFilter::Exact('x').accepts('y'));
+
+        assert!(CharacterFilter::OneOf(vec!['a', 'b', 'c']).accepts('b'));
+        assert!(!CharacterFilter::OneOf(vec!['a', 'b', 'c']).accepts('d'));
+    }
+
+    #[test]
+    fn test_position_filter_validation() {
+        let filter = PositionFilter::new(
+            PositionRange::Range(0, 1),
+            CharacterFilter::Alphabetic,
+        );
+
+        assert!(filter.validate_position(0, 'A'));
+        assert!(filter.validate_position(1, 'b'));
+        assert!(!filter.validate_position(0, '1'));
+        assert!(filter.validate_position(2, '1')); // Position 2 not covered, allow anything
+    }
+
+    #[test]
+    fn test_pattern_filters_validation() {
+        let patterns = PatternFilters::new()
+            .add_filter(PositionFilter::new(
+                PositionRange::Range(0, 1),
+                CharacterFilter::Alphabetic,
+            ))
+            .add_filter(PositionFilter::new(
+                PositionRange::Range(2, 4),
+                CharacterFilter::Numeric,
+            ));
+
+        // Valid pattern: AB123
+        assert!(patterns.validate_text("AB123").is_ok());
+
+        // Invalid: number in alphabetic position
+        assert!(patterns.validate_text("A1123").is_err());
+
+        // Invalid: letter in numeric position
+        assert!(patterns.validate_text("AB1A3").is_err());
+    }
+
+    #[test]
+    fn test_custom_filter() {
+        let pattern = PatternFilters::new()
+            .add_filter(PositionFilter::new(
+                PositionRange::From(0),
+                CharacterFilter::Custom(Arc::new(|c| c.is_lowercase())),
+            ));
+
+        assert!(pattern.validate_text("hello").is_ok());
+        assert!(pattern.validate_text("Hello").is_err()); // Uppercase not allowed
+    }
+}

canvas/src/validation/state.rs

@@ -0,0 +1,399 @@
+// src/validation/state.rs
+//! Validation state management
+
+use crate::validation::{ValidationConfig, ValidationResult};
+use std::collections::HashMap;
+
+/// Validation state for all fields in a form
+#[derive(Debug, Clone, Default)]
+pub struct ValidationState {
+    /// Validation configurations per field index
+    field_configs: HashMap<usize, ValidationConfig>,
+    
+    /// Current validation results per field index
+    field_results: HashMap<usize, ValidationResult>,
+    
+    /// Track which fields have been validated
+    validated_fields: std::collections::HashSet<usize>,
+    
+    /// Global validation enabled/disabled
+    enabled: bool,
+}
+
+impl ValidationState {
+    /// Create a new validation state
+    pub fn new() -> Self {
+        Self {
+            field_configs: HashMap::new(),
+            field_results: HashMap::new(),
+            validated_fields: std::collections::HashSet::new(),
+            enabled: true,
+        }
+    }
+    
+    /// Enable or disable validation globally
+    pub fn set_enabled(&mut self, enabled: bool) {
+        self.enabled = enabled;
+        if !enabled {
+            // Clear all validation results when disabled
+            self.field_results.clear();
+            self.validated_fields.clear();
+        }
+    }
+    
+    /// Check if validation is enabled
+    pub fn is_enabled(&self) -> bool {
+        self.enabled
+    }
+    
+    /// Set validation configuration for a field
+    pub fn set_field_config(&mut self, field_index: usize, config: ValidationConfig) {
+        if config.has_validation() {
+            self.field_configs.insert(field_index, config);
+        } else {
+            self.field_configs.remove(&field_index);
+            self.field_results.remove(&field_index);
+            self.validated_fields.remove(&field_index);
+        }
+    }
+    
+    /// Get validation configuration for a field
+    pub fn get_field_config(&self, field_index: usize) -> Option<&ValidationConfig> {
+        self.field_configs.get(&field_index)
+    }
+    
+    /// Remove validation configuration for a field
+    pub fn remove_field_config(&mut self, field_index: usize) {
+        self.field_configs.remove(&field_index);
+        self.field_results.remove(&field_index);
+        self.validated_fields.remove(&field_index);
+    }
+    
+    /// Validate character insertion for a field
+    pub fn validate_char_insertion(
+        &mut self,
+        field_index: usize,
+        current_text: &str,
+        position: usize,
+        character: char,
+    ) -> ValidationResult {
+        if !self.enabled {
+            return ValidationResult::Valid;
+        }
+        
+        if let Some(config) = self.field_configs.get(&field_index) {
+            let result = config.validate_char_insertion(current_text, position, character);
+            
+            // Store the validation result
+            self.field_results.insert(field_index, result.clone());
+            self.validated_fields.insert(field_index);
+            
+            result
+        } else {
+            ValidationResult::Valid
+        }
+    }
+    
+    /// Validate field content
+    pub fn validate_field_content(
+        &mut self,
+        field_index: usize,
+        text: &str,
+    ) -> ValidationResult {
+        if !self.enabled {
+            return ValidationResult::Valid;
+        }
+        
+        if let Some(config) = self.field_configs.get(&field_index) {
+            let result = config.validate_content(text);
+            
+            // Store the validation result
+            self.field_results.insert(field_index, result.clone());
+            self.validated_fields.insert(field_index);
+            
+            result
+        } else {
+            ValidationResult::Valid
+        }
+    }
+    
+    /// Get current validation result for a field
+    pub fn get_field_result(&self, field_index: usize) -> Option<&ValidationResult> {
+        self.field_results.get(&field_index)
+    }
+    
+    /// Check if a field has been validated
+    pub fn is_field_validated(&self, field_index: usize) -> bool {
+        self.validated_fields.contains(&field_index)
+    }
+    
+    /// Clear validation result for a field
+    pub fn clear_field_result(&mut self, field_index: usize) {
+        self.field_results.remove(&field_index);
+        self.validated_fields.remove(&field_index);
+    }
+    
+    /// Clear all validation results
+    pub fn clear_all_results(&mut self) {
+        self.field_results.clear();
+        self.validated_fields.clear();
+    }
+    
+    /// Get all field indices that have validation configured
+    pub fn validated_field_indices(&self) -> impl Iterator<Item = usize> + '_ {
+        self.field_configs.keys().copied()
+    }
+    
+    /// Get all field indices with validation errors
+    pub fn fields_with_errors(&self) -> impl Iterator<Item = usize> + '_ {
+        self.field_results
+            .iter()
+            .filter(|(_, result)| result.is_error())
+            .map(|(index, _)| *index)
+    }
+    
+    /// Get all field indices with validation warnings
+    pub fn fields_with_warnings(&self) -> impl Iterator<Item = usize> + '_ {
+        self.field_results
+            .iter()
+            .filter(|(_, result)| matches!(result, ValidationResult::Warning { .. }))
+            .map(|(index, _)| *index)
+    }
+    
+    /// Check if any field has validation errors
+    pub fn has_errors(&self) -> bool {
+        self.field_results.values().any(|result| result.is_error())
+    }
+    
+    /// Check if any field has validation warnings
+    pub fn has_warnings(&self) -> bool {
+        self.field_results.values().any(|result| matches!(result, ValidationResult::Warning { .. }))
+    }
+    
+    /// Get total count of fields with validation configured
+    pub fn validated_field_count(&self) -> usize {
+        self.field_configs.len()
+    }
+    
+    /// Check if field switching is allowed for a specific field
+    pub fn allows_field_switch(&self, field_index: usize, text: &str) -> bool {
+        if !self.enabled {
+            return true;
+        }
+        
+        if let Some(config) = self.field_configs.get(&field_index) {
+            config.allows_field_switch(text)
+        } else {
+            true // No validation configured, allow switching
+        }
+    }
+    
+    /// Get reason why field switching is blocked (if any)
+    pub fn field_switch_block_reason(&self, field_index: usize, text: &str) -> Option<String> {
+        if !self.enabled {
+            return None;
+        }
+        
+        if let Some(config) = self.field_configs.get(&field_index) {
+            config.field_switch_block_reason(text)
+        } else {
+            None // No validation configured
+        }
+    }
+    pub fn summary(&self) -> ValidationSummary {
+        let total_validated = self.validated_fields.len();
+        let errors = self.fields_with_errors().count();
+        let warnings = self.fields_with_warnings().count();
+        let valid = total_validated - errors - warnings;
+        
+        ValidationSummary {
+            total_fields: self.field_configs.len(),
+            validated_fields: total_validated,
+            valid_fields: valid,
+            warning_fields: warnings,
+            error_fields: errors,
+        }
+    }
+}
+
+/// Summary of validation state across all fields
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ValidationSummary {
+    /// Total number of fields with validation configured
+    pub total_fields: usize,
+    
+    /// Number of fields that have been validated
+    pub validated_fields: usize,
+    
+    /// Number of fields with valid validation results
+    pub valid_fields: usize,
+    
+    /// Number of fields with warnings
+    pub warning_fields: usize,
+    
+    /// Number of fields with errors
+    pub error_fields: usize,
+}
+
+impl ValidationSummary {
+    /// Check if all configured fields are valid
+    pub fn is_all_valid(&self) -> bool {
+        self.error_fields == 0 && self.validated_fields == self.total_fields
+    }
+    
+    /// Check if there are any errors
+    pub fn has_errors(&self) -> bool {
+        self.error_fields > 0
+    }
+    
+    /// Check if there are any warnings
+    pub fn has_warnings(&self) -> bool {
+        self.warning_fields > 0
+    }
+    
+    /// Get completion percentage (validated fields / total fields)
+    pub fn completion_percentage(&self) -> f32 {
+        if self.total_fields == 0 {
+            1.0
+        } else {
+            self.validated_fields as f32 / self.total_fields as f32
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::validation::{CharacterLimits, ValidationConfigBuilder};
+
+    #[test]
+    fn test_validation_state_creation() {
+        let state = ValidationState::new();
+        assert!(state.is_enabled());
+        assert_eq!(state.validated_field_count(), 0);
+    }
+    
+    #[test]
+    fn test_enable_disable() {
+        let mut state = ValidationState::new();
+        
+        // Add some validation config
+        let config = ValidationConfigBuilder::new()
+            .with_max_length(10)
+            .build();
+        state.set_field_config(0, config);
+        
+        // Validate something
+        let result = state.validate_field_content(0, "test");
+        assert!(result.is_acceptable());
+        assert!(state.is_field_validated(0));
+        
+        // Disable validation
+        state.set_enabled(false);
+        assert!(!state.is_enabled());
+        assert!(!state.is_field_validated(0)); // Should be cleared
+        
+        // Validation should now return valid regardless
+        let result = state.validate_field_content(0, "this is way too long for the limit");
+        assert!(result.is_acceptable());
+    }
+    
+    #[test]
+    fn test_field_config_management() {
+        let mut state = ValidationState::new();
+        
+        let config = ValidationConfigBuilder::new()
+            .with_max_length(5)
+            .build();
+        
+        // Set config
+        state.set_field_config(0, config);
+        assert_eq!(state.validated_field_count(), 1);
+        assert!(state.get_field_config(0).is_some());
+        
+        // Remove config
+        state.remove_field_config(0);
+        assert_eq!(state.validated_field_count(), 0);
+        assert!(state.get_field_config(0).is_none());
+    }
+    
+    #[test]
+    fn test_character_insertion_validation() {
+        let mut state = ValidationState::new();
+        
+        let config = ValidationConfigBuilder::new()
+            .with_max_length(5)
+            .build();
+        state.set_field_config(0, config);
+        
+        // Valid insertion
+        let result = state.validate_char_insertion(0, "test", 4, 'x');
+        assert!(result.is_acceptable());
+        
+        // Invalid insertion
+        let result = state.validate_char_insertion(0, "tests", 5, 'x');
+        assert!(!result.is_acceptable());
+        
+        // Check that result was stored
+        assert!(state.is_field_validated(0));
+        let stored_result = state.get_field_result(0);
+        assert!(stored_result.is_some());
+        assert!(!stored_result.unwrap().is_acceptable());
+    }
+    
+    #[test]
+    fn test_validation_summary() {
+        let mut state = ValidationState::new();
+        
+        // Configure two fields
+        let config1 = ValidationConfigBuilder::new().with_max_length(5).build();
+        let config2 = ValidationConfigBuilder::new().with_max_length(10).build();
+        state.set_field_config(0, config1);
+        state.set_field_config(1, config2);
+        
+        // Validate field 0 (valid)
+        state.validate_field_content(0, "test");
+        
+        // Validate field 1 (error)
+        state.validate_field_content(1, "this is too long");
+        
+        let summary = state.summary();
+        assert_eq!(summary.total_fields, 2);
+        assert_eq!(summary.validated_fields, 2);
+        assert_eq!(summary.valid_fields, 1);
+        assert_eq!(summary.error_fields, 1);
+        assert_eq!(summary.warning_fields, 0);
+        
+        assert!(!summary.is_all_valid());
+        assert!(summary.has_errors());
+        assert!(!summary.has_warnings());
+        assert_eq!(summary.completion_percentage(), 1.0);
+    }
+    
+    #[test]
+    fn test_error_and_warning_tracking() {
+        let mut state = ValidationState::new();
+        
+        let config = ValidationConfigBuilder::new()
+            .with_character_limits(
+                CharacterLimits::new_range(3, 10).with_warning_threshold(8)
+            )
+            .build();
+        state.set_field_config(0, config);
+        
+        // Too short (warning)
+        state.validate_field_content(0, "hi");
+        assert!(state.has_warnings());
+        assert!(!state.has_errors());
+        
+        // Just right
+        state.validate_field_content(0, "hello");
+        assert!(!state.has_warnings());
+        assert!(!state.has_errors());
+        
+        // Too long (error)
+        state.validate_field_content(0, "hello world!");
+        assert!(!state.has_warnings());
+        assert!(state.has_errors());
+    }
+}

client/config.toml

@@ -50,7 +50,7 @@ move_right = ["l", "Right"]
 move_down = ["j", "Down"]
 # Optional
 move_line_end = ["$"]
-move_word_next = ["w"]
+# move_word_next = ["w"]
 next_field = ["Tab"]
 move_word_prev = ["b"]
 move_word_end = ["e"]

common/build.rs

@@ -15,6 +15,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 "proto/tables_data.proto",
                 "proto/table_script.proto",
                 "proto/search.proto",
+                "proto/search2.proto",
             ],
             &["proto"],
         )?;

common/proto/search2.proto

@@ -0,0 +1,46 @@
+// In common/proto/search2.proto
+syntax = "proto3";
+package komp_ac.search2;
+
+service Search2 {
+    rpc SearchTable(Search2Request) returns (Search2Response);
+}
+
+message Search2Request {
+  string profile_name = 1;
+  string table_name = 2;
+  repeated ColumnFilter column_filters = 3;
+  optional string text_query = 4;  // Optional fallback text search
+  optional int32 limit = 5;
+  optional string order_by = 6;
+  optional bool order_desc = 7;
+}
+
+message ColumnFilter {
+    string column_name = 1;
+    FilterType filter_type = 2;
+    string value = 3;
+    optional string value2 = 4;  // For range queries
+}
+
+enum FilterType {
+    EQUALS = 0;
+    CONTAINS = 1;
+    STARTS_WITH = 2;
+    ENDS_WITH = 3;
+    RANGE = 4;
+    GREATER_THAN = 5;
+    LESS_THAN = 6;
+    IS_NULL = 7;
+    IS_NOT_NULL = 8;
+}
+
+message Search2Response {
+    message Hit {
+        int64 id = 1;
+        string content_json = 2;  // No score - this is SQL-based
+        optional string match_info = 3;  // Info about which columns matched
+    }
+    repeated Hit hits = 1;
+    int32 total_count = 2;  // Total matching records (for pagination)
+}

common/src/lib.rs

@@ -31,6 +31,9 @@ pub mod proto {
         pub mod search {
             include!("proto/komp_ac.search.rs");
         }
+        pub mod search2 {
+            include!("proto/komp_ac.search2.rs");
+        }
         pub const FILE_DESCRIPTOR_SET: &[u8] =
             include_bytes!("proto/descriptor.bin");
     }

common/src/proto/komp_ac.search2.rs

@@ -0,0 +1,394 @@
+// This file is @generated by prost-build.
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct Search2Request {
+    #[prost(string, tag = "1")]
+    pub profile_name: ::prost::alloc::string::String,
+    #[prost(string, tag = "2")]
+    pub table_name: ::prost::alloc::string::String,
+    #[prost(message, repeated, tag = "3")]
+    pub column_filters: ::prost::alloc::vec::Vec<ColumnFilter>,
+    /// Optional fallback text search
+    #[prost(string, optional, tag = "4")]
+    pub text_query: ::core::option::Option<::prost::alloc::string::String>,
+    #[prost(int32, optional, tag = "5")]
+    pub limit: ::core::option::Option<i32>,
+    #[prost(string, optional, tag = "6")]
+    pub order_by: ::core::option::Option<::prost::alloc::string::String>,
+    #[prost(bool, optional, tag = "7")]
+    pub order_desc: ::core::option::Option<bool>,
+}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ColumnFilter {
+    #[prost(string, tag = "1")]
+    pub column_name: ::prost::alloc::string::String,
+    #[prost(enumeration = "FilterType", tag = "2")]
+    pub filter_type: i32,
+    #[prost(string, tag = "3")]
+    pub value: ::prost::alloc::string::String,
+    /// For range queries
+    #[prost(string, optional, tag = "4")]
+    pub value2: ::core::option::Option<::prost::alloc::string::String>,
+}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct Search2Response {
+    #[prost(message, repeated, tag = "1")]
+    pub hits: ::prost::alloc::vec::Vec<search2_response::Hit>,
+    /// Total matching records (for pagination)
+    #[prost(int32, tag = "2")]
+    pub total_count: i32,
+}
+/// Nested message and enum types in `Search2Response`.
+pub mod search2_response {
+    #[derive(Clone, PartialEq, ::prost::Message)]
+    pub struct Hit {
+        #[prost(int64, tag = "1")]
+        pub id: i64,
+        /// No score - this is SQL-based
+        #[prost(string, tag = "2")]
+        pub content_json: ::prost::alloc::string::String,
+        /// Info about which columns matched
+        #[prost(string, optional, tag = "3")]
+        pub match_info: ::core::option::Option<::prost::alloc::string::String>,
+    }
+}
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, ::prost::Enumeration)]
+#[repr(i32)]
+pub enum FilterType {
+    Equals = 0,
+    Contains = 1,
+    StartsWith = 2,
+    EndsWith = 3,
+    Range = 4,
+    GreaterThan = 5,
+    LessThan = 6,
+    IsNull = 7,
+    IsNotNull = 8,
+}
+impl FilterType {
+    /// String value of the enum field names used in the ProtoBuf definition.
+    ///
+    /// The values are not transformed in any way and thus are considered stable
+    /// (if the ProtoBuf definition does not change) and safe for programmatic use.
+    pub fn as_str_name(&self) -> &'static str {
+        match self {
+            Self::Equals => "EQUALS",
+            Self::Contains => "CONTAINS",
+            Self::StartsWith => "STARTS_WITH",
+            Self::EndsWith => "ENDS_WITH",
+            Self::Range => "RANGE",
+            Self::GreaterThan => "GREATER_THAN",
+            Self::LessThan => "LESS_THAN",
+            Self::IsNull => "IS_NULL",
+            Self::IsNotNull => "IS_NOT_NULL",
+        }
+    }
+    /// Creates an enum from field names used in the ProtoBuf definition.
+    pub fn from_str_name(value: &str) -> ::core::option::Option<Self> {
+        match value {
+            "EQUALS" => Some(Self::Equals),
+            "CONTAINS" => Some(Self::Contains),
+            "STARTS_WITH" => Some(Self::StartsWith),
+            "ENDS_WITH" => Some(Self::EndsWith),
+            "RANGE" => Some(Self::Range),
+            "GREATER_THAN" => Some(Self::GreaterThan),
+            "LESS_THAN" => Some(Self::LessThan),
+            "IS_NULL" => Some(Self::IsNull),
+            "IS_NOT_NULL" => Some(Self::IsNotNull),
+            _ => None,
+        }
+    }
+}
+/// Generated client implementations.
+pub mod search2_client {
+    #![allow(
+        unused_variables,
+        dead_code,
+        missing_docs,
+        clippy::wildcard_imports,
+        clippy::let_unit_value,
+    )]
+    use tonic::codegen::*;
+    use tonic::codegen::http::Uri;
+    #[derive(Debug, Clone)]
+    pub struct Search2Client<T> {
+        inner: tonic::client::Grpc<T>,
+    }
+    impl Search2Client<tonic::transport::Channel> {
+        /// Attempt to create a new client by connecting to a given endpoint.
+        pub async fn connect<D>(dst: D) -> Result<Self, tonic::transport::Error>
+        where
+            D: TryInto<tonic::transport::Endpoint>,
+            D::Error: Into<StdError>,
+        {
+            let conn = tonic::transport::Endpoint::new(dst)?.connect().await?;
+            Ok(Self::new(conn))
+        }
+    }
+    impl<T> Search2Client<T>
+    where
+        T: tonic::client::GrpcService<tonic::body::Body>,
+        T::Error: Into<StdError>,
+        T::ResponseBody: Body<Data = Bytes> + std::marker::Send + 'static,
+        <T::ResponseBody as Body>::Error: Into<StdError> + std::marker::Send,
+    {
+        pub fn new(inner: T) -> Self {
+            let inner = tonic::client::Grpc::new(inner);
+            Self { inner }
+        }
+        pub fn with_origin(inner: T, origin: Uri) -> Self {
+            let inner = tonic::client::Grpc::with_origin(inner, origin);
+            Self { inner }
+        }
+        pub fn with_interceptor<F>(
+            inner: T,
+            interceptor: F,
+        ) -> Search2Client<InterceptedService<T, F>>
+        where
+            F: tonic::service::Interceptor,
+            T::ResponseBody: Default,
+            T: tonic::codegen::Service<
+                http::Request<tonic::body::Body>,
+                Response = http::Response<
+                    <T as tonic::client::GrpcService<tonic::body::Body>>::ResponseBody,
+                >,
+            >,
+            <T as tonic::codegen::Service<
+                http::Request<tonic::body::Body>,
+            >>::Error: Into<StdError> + std::marker::Send + std::marker::Sync,
+        {
+            Search2Client::new(InterceptedService::new(inner, interceptor))
+        }
+        /// Compress requests with the given encoding.
+        ///
+        /// This requires the server to support it otherwise it might respond with an
+        /// error.
+        #[must_use]
+        pub fn send_compressed(mut self, encoding: CompressionEncoding) -> Self {
+            self.inner = self.inner.send_compressed(encoding);
+            self
+        }
+        /// Enable decompressing responses.
+        #[must_use]
+        pub fn accept_compressed(mut self, encoding: CompressionEncoding) -> Self {
+            self.inner = self.inner.accept_compressed(encoding);
+            self
+        }
+        /// Limits the maximum size of a decoded message.
+        ///
+        /// Default: `4MB`
+        #[must_use]
+        pub fn max_decoding_message_size(mut self, limit: usize) -> Self {
+            self.inner = self.inner.max_decoding_message_size(limit);
+            self
+        }
+        /// Limits the maximum size of an encoded message.
+        ///
+        /// Default: `usize::MAX`
+        #[must_use]
+        pub fn max_encoding_message_size(mut self, limit: usize) -> Self {
+            self.inner = self.inner.max_encoding_message_size(limit);
+            self
+        }
+        pub async fn search_table(
+            &mut self,
+            request: impl tonic::IntoRequest<super::Search2Request>,
+        ) -> std::result::Result<
+            tonic::Response<super::Search2Response>,
+            tonic::Status,
+        > {
+            self.inner
+                .ready()
+                .await
+                .map_err(|e| {
+                    tonic::Status::unknown(
+                        format!("Service was not ready: {}", e.into()),
+                    )
+                })?;
+            let codec = tonic::codec::ProstCodec::default();
+            let path = http::uri::PathAndQuery::from_static(
+                "/komp_ac.search2.Search2/SearchTable",
+            );
+            let mut req = request.into_request();
+            req.extensions_mut()
+                .insert(GrpcMethod::new("komp_ac.search2.Search2", "SearchTable"));
+            self.inner.unary(req, path, codec).await
+        }
+    }
+}
+/// Generated server implementations.
+pub mod search2_server {
+    #![allow(
+        unused_variables,
+        dead_code,
+        missing_docs,
+        clippy::wildcard_imports,
+        clippy::let_unit_value,
+    )]
+    use tonic::codegen::*;
+    /// Generated trait containing gRPC methods that should be implemented for use with Search2Server.
+    #[async_trait]
+    pub trait Search2: std::marker::Send + std::marker::Sync + 'static {
+        async fn search_table(
+            &self,
+            request: tonic::Request<super::Search2Request>,
+        ) -> std::result::Result<tonic::Response<super::Search2Response>, tonic::Status>;
+    }
+    #[derive(Debug)]
+    pub struct Search2Server<T> {
+        inner: Arc<T>,
+        accept_compression_encodings: EnabledCompressionEncodings,
+        send_compression_encodings: EnabledCompressionEncodings,
+        max_decoding_message_size: Option<usize>,
+        max_encoding_message_size: Option<usize>,
+    }
+    impl<T> Search2Server<T> {
+        pub fn new(inner: T) -> Self {
+            Self::from_arc(Arc::new(inner))
+        }
+        pub fn from_arc(inner: Arc<T>) -> Self {
+            Self {
+                inner,
+                accept_compression_encodings: Default::default(),
+                send_compression_encodings: Default::default(),
+                max_decoding_message_size: None,
+                max_encoding_message_size: None,
+            }
+        }
+        pub fn with_interceptor<F>(
+            inner: T,
+            interceptor: F,
+        ) -> InterceptedService<Self, F>
+        where
+            F: tonic::service::Interceptor,
+        {
+            InterceptedService::new(Self::new(inner), interceptor)
+        }
+        /// Enable decompressing requests with the given encoding.
+        #[must_use]
+        pub fn accept_compressed(mut self, encoding: CompressionEncoding) -> Self {
+            self.accept_compression_encodings.enable(encoding);
+            self
+        }
+        /// Compress responses with the given encoding, if the client supports it.
+        #[must_use]
+        pub fn send_compressed(mut self, encoding: CompressionEncoding) -> Self {
+            self.send_compression_encodings.enable(encoding);
+            self
+        }
+        /// Limits the maximum size of a decoded message.
+        ///
+        /// Default: `4MB`
+        #[must_use]
+        pub fn max_decoding_message_size(mut self, limit: usize) -> Self {
+            self.max_decoding_message_size = Some(limit);
+            self
+        }
+        /// Limits the maximum size of an encoded message.
+        ///
+        /// Default: `usize::MAX`
+        #[must_use]
+        pub fn max_encoding_message_size(mut self, limit: usize) -> Self {
+            self.max_encoding_message_size = Some(limit);
+            self
+        }
+    }
+    impl<T, B> tonic::codegen::Service<http::Request<B>> for Search2Server<T>
+    where
+        T: Search2,
+        B: Body + std::marker::Send + 'static,
+        B::Error: Into<StdError> + std::marker::Send + 'static,
+    {
+        type Response = http::Response<tonic::body::Body>;
+        type Error = std::convert::Infallible;
+        type Future = BoxFuture<Self::Response, Self::Error>;
+        fn poll_ready(
+            &mut self,
+            _cx: &mut Context<'_>,
+        ) -> Poll<std::result::Result<(), Self::Error>> {
+            Poll::Ready(Ok(()))
+        }
+        fn call(&mut self, req: http::Request<B>) -> Self::Future {
+            match req.uri().path() {
+                "/komp_ac.search2.Search2/SearchTable" => {
+                    #[allow(non_camel_case_types)]
+                    struct SearchTableSvc<T: Search2>(pub Arc<T>);
+                    impl<T: Search2> tonic::server::UnaryService<super::Search2Request>
+                    for SearchTableSvc<T> {
+                        type Response = super::Search2Response;
+                        type Future = BoxFuture<
+                            tonic::Response<Self::Response>,
+                            tonic::Status,
+                        >;
+                        fn call(
+                            &mut self,
+                            request: tonic::Request<super::Search2Request>,
+                        ) -> Self::Future {
+                            let inner = Arc::clone(&self.0);
+                            let fut = async move {
+                                <T as Search2>::search_table(&inner, request).await
+                            };
+                            Box::pin(fut)
+                        }
+                    }
+                    let accept_compression_encodings = self.accept_compression_encodings;
+                    let send_compression_encodings = self.send_compression_encodings;
+                    let max_decoding_message_size = self.max_decoding_message_size;
+                    let max_encoding_message_size = self.max_encoding_message_size;
+                    let inner = self.inner.clone();
+                    let fut = async move {
+                        let method = SearchTableSvc(inner);
+                        let codec = tonic::codec::ProstCodec::default();
+                        let mut grpc = tonic::server::Grpc::new(codec)
+                            .apply_compression_config(
+                                accept_compression_encodings,
+                                send_compression_encodings,
+                            )
+                            .apply_max_message_size_config(
+                                max_decoding_message_size,
+                                max_encoding_message_size,
+                            );
+                        let res = grpc.unary(method, req).await;
+                        Ok(res)
+                    };
+                    Box::pin(fut)
+                }
+                _ => {
+                    Box::pin(async move {
+                        let mut response = http::Response::new(
+                            tonic::body::Body::default(),
+                        );
+                        let headers = response.headers_mut();
+                        headers
+                            .insert(
+                                tonic::Status::GRPC_STATUS,
+                                (tonic::Code::Unimplemented as i32).into(),
+                            );
+                        headers
+                            .insert(
+                                http::header::CONTENT_TYPE,
+                                tonic::metadata::GRPC_CONTENT_TYPE,
+                            );
+                        Ok(response)
+                    })
+                }
+            }
+        }
+    }
+    impl<T> Clone for Search2Server<T> {
+        fn clone(&self) -> Self {
+            let inner = self.inner.clone();
+            Self {
+                inner,
+                accept_compression_encodings: self.accept_compression_encodings,
+                send_compression_encodings: self.send_compression_encodings,
+                max_decoding_message_size: self.max_decoding_message_size,
+                max_encoding_message_size: self.max_encoding_message_size,
+            }
+        }
+    }
+    /// Generated gRPC service name
+    pub const SERVICE_NAME: &str = "komp_ac.search2.Search2";
+    impl<T> tonic::server::NamedService for Search2Server<T> {
+        const NAME: &'static str = SERVICE_NAME;
+    }
+}

server/src/auth/handlers/register.rs

@@ -11,6 +11,11 @@ pub async fn register(
     pool: &PgPool,
     payload: RegisterRequest,
 ) -> Result<Response<AuthResponse>, Status> {
+    // Validate required fields
+    if payload.email.trim().is_empty() {
+        return Err(Status::invalid_argument("Email is required"));
+    }
+    
     // Validate passwords match
     if payload.password != payload.password_confirmation {
         return Err(Status::invalid_argument(AuthError::PasswordMismatch.to_string()));
@@ -41,6 +46,15 @@ pub async fn register(
             if db_err.constraint() == Some("valid_roles") {
                 return Status::invalid_argument(format!("Invalid role specified: '{}'", role_to_insert));
             }
+            // Check for specific constraint violations
+            if let Some(constraint) = db_err.constraint() {
+                if constraint.contains("users_username_key") {
+                    return Status::already_exists("Username already exists".to_string());
+                }
+                if constraint.contains("users_email_key") {
+                    return Status::already_exists("Email already exists".to_string());
+                }
+            }
         }
         if e.to_string().contains("duplicate key") {
             Status::already_exists(AuthError::UserExists.to_string())

server/src/server/run.rs

@@ -10,14 +10,16 @@ use crate::server::services::{
     TableDefinitionService,
     TablesDataService,
     TableScriptService,
-    AuthServiceImpl
+    AuthServiceImpl,
+    Search2Service,
 };
 use common::proto::komp_ac::{
     table_structure::table_structure_service_server::TableStructureServiceServer,
     table_definition::table_definition_server::TableDefinitionServer,
     tables_data::tables_data_server::TablesDataServer,
     table_script::table_script_server::TableScriptServer,
-    auth::auth_service_server::AuthServiceServer
+    auth::auth_service_server::AuthServiceServer,
+    search2::search2_server::Search2Server,
 };
 use search::{SearcherService, SearcherServer};
 
@@ -47,9 +49,8 @@ pub async fn run_server(db_pool: sqlx::PgPool) -> Result<(), Box<dyn std::error:
     };
     let table_script_service = TableScriptService { db_pool: db_pool.clone() };
     let auth_service = AuthServiceImpl { db_pool: db_pool.clone() };
-
-    // MODIFIED: Instantiate SearcherService with the database pool
     let search_service = SearcherService { pool: db_pool.clone() };
+    let search2_service = Search2Service { db_pool: db_pool.clone() };
 
     Server::builder()
         .add_service(TableStructureServiceServer::new(TableStructureHandler { db_pool: db_pool.clone() }))
@@ -58,6 +59,7 @@ pub async fn run_server(db_pool: sqlx::PgPool) -> Result<(), Box<dyn std::error:
         .add_service(TableScriptServer::new(table_script_service))
         .add_service(AuthServiceServer::new(auth_service))
         .add_service(SearcherServer::new(search_service))
+        .add_service(Search2Server::new(search2_service))
         .add_service(reflection_service)
         .serve(addr)
         .await?;

server/src/server/services/mod.rs

@@ -5,9 +5,11 @@ pub mod table_definition_service;
 pub mod tables_data_service;
 pub mod table_script_service;
 pub mod auth_service;
+pub mod search2_service;
 
 pub use table_structure_service::TableStructureHandler;
 pub use table_definition_service::TableDefinitionService;
 pub use tables_data_service::TablesDataService;
 pub use table_script_service::TableScriptService;
 pub use auth_service::AuthServiceImpl;
+pub use search2_service::*;

server/src/server/services/search2_service.rs

@@ -0,0 +1,202 @@
+// src/server/services/search2_service.rs
+use tonic::{Request, Response, Status};
+use sqlx::PgPool;
+use sqlx::Row;
+use common::proto::komp_ac::search2::{
+    search2_server::Search2,
+    Search2Request, Search2Response, ColumnFilter, FilterType,
+    search2_response::Hit,
+};
+use crate::shared::schema_qualifier::qualify_table_name_for_data;
+
+pub struct Search2Service {
+    pub db_pool: PgPool,
+}
+
+#[tonic::async_trait]
+impl Search2 for Search2Service {
+    async fn search_table(
+        &self,
+        request: Request<Search2Request>,
+    ) -> Result<Response<Search2Response>, Status> {
+        let req = request.into_inner();
+
+        // Build SQL query - NOW PASS DB_POOL AND AWAIT
+        let (sql, bind_values, count_sql) = build_search_query(&self.db_pool, &req).await
+            .map_err(|e| Status::invalid_argument(format!("Query build error: {}", e)))?;
+
+        // Execute main query
+        let rows = execute_query(&self.db_pool, &sql, &bind_values).await
+            .map_err(|e| Status::internal(format!("Database error: {}", e)))?;
+
+        // Execute count query for pagination
+        let total_count = execute_count_query(&self.db_pool, &count_sql, &bind_values).await
+            .map_err(|e| Status::internal(format!("Count query error: {}", e)))?;
+
+        // Convert to response format
+        let hits = rows.into_iter().map(|row| {
+            Hit {
+                id: row.id,
+                content_json: row.content_json,
+                match_info: Some(format!("SQL search on table: {}", req.table_name)),
+            }
+        }).collect();
+
+        Ok(Response::new(Search2Response {
+            hits,
+            total_count,
+        }))
+    }
+}
+
+#[derive(Debug)]
+struct QueryRow {
+    id: i64,
+    content_json: String,
+}
+
+// MAKE THIS FUNCTION ASYNC AND ADD DB_POOL PARAMETER
+async fn build_search_query(
+    db_pool: &PgPool, 
+    request: &Search2Request
+) -> Result<(String, Vec<String>, String), String> {
+    
+    // Since Search2Request doesn't have profile_name, use "default"
+    // You can add profile_name to the proto later if needed
+    let profile_name = "default";
+    
+    // NOW AWAIT THE ASYNC FUNCTION CALL
+    let qualified_table = qualify_table_name_for_data(db_pool, profile_name, &request.table_name)
+        .await
+        .map_err(|e| format!("Invalid table name: {}", e))?;
+
+    let mut conditions = vec!["deleted = FALSE".to_string()];
+    let mut bind_values = Vec::new();
+
+    // Build WHERE conditions from column filters
+    for filter in &request.column_filters {
+        let condition = build_filter_condition(filter, &mut bind_values)?;
+        conditions.push(condition);
+    }
+
+    // Add text search fallback if provided
+    if let Some(text_query) = &request.text_query {
+        if !text_query.trim().is_empty() {
+            bind_values.push(format!("%{}%", text_query.to_lowercase()));
+            conditions.push(format!(
+                "EXISTS (SELECT 1 FROM jsonb_each_text(to_jsonb(t)) as kv(key, value) WHERE LOWER(value) LIKE ${})",
+                bind_values.len()
+            ));
+        }
+    }
+
+    let where_clause = conditions.join(" AND ");
+
+    // Build ORDER BY clause
+    let order_clause = if let Some(order_by) = &request.order_by {
+        let direction = if request.order_desc.unwrap_or(false) { "DESC" } else { "ASC" };
+        format!("ORDER BY \"{}\" {}", order_by, direction)
+    } else {
+        "ORDER BY id DESC".to_string()
+    };
+
+    let limit_clause = format!("LIMIT {}", request.limit.unwrap_or(100));
+
+    // Main query
+    let sql = format!(
+        "SELECT id, to_jsonb(t) AS data FROM {} t WHERE {} {} {}",
+        qualified_table, where_clause, order_clause, limit_clause
+    );
+
+    // Count query (for pagination)
+    let count_sql = format!(
+        "SELECT COUNT(*) FROM {} t WHERE {}",
+        qualified_table, where_clause
+    );
+
+    Ok((sql, bind_values, count_sql))
+}
+
+fn build_filter_condition(filter: &ColumnFilter, bind_values: &mut Vec<String>) -> Result<String, String> {
+    // FIX DEPRECATED WARNING - USE TryFrom INSTEAD
+    let filter_type = FilterType::try_from(filter.filter_type)
+        .map_err(|_| "Invalid filter type".to_string())?;
+
+    let param_idx = bind_values.len() + 1;
+
+    let condition = match filter_type {
+        FilterType::Equals => {
+            bind_values.push(filter.value.clone());
+            format!("\"{}\" = ${}", filter.column_name, param_idx)
+        },
+        FilterType::Contains => {
+            bind_values.push(format!("%{}%", filter.value));
+            format!("\"{}\" ILIKE ${}", filter.column_name, param_idx)
+        },
+        FilterType::StartsWith => {
+            bind_values.push(format!("{}%", filter.value));
+            format!("\"{}\" ILIKE ${}", filter.column_name, param_idx)
+        },
+        FilterType::EndsWith => {
+            bind_values.push(format!("%{}", filter.value));
+            format!("\"{}\" ILIKE ${}", filter.column_name, param_idx)
+        },
+        FilterType::Range => {
+            bind_values.push(filter.value.clone());
+            bind_values.push(filter.value2.as_ref().unwrap_or(&"".to_string()).clone());
+            format!("\"{}\" BETWEEN ${} AND ${}", filter.column_name, param_idx, param_idx + 1)
+        },
+        FilterType::GreaterThan => {
+            bind_values.push(filter.value.clone());
+            format!("\"{}\" > ${}", filter.column_name, param_idx)
+        },
+        FilterType::LessThan => {
+            bind_values.push(filter.value.clone());
+            format!("\"{}\" < ${}", filter.column_name, param_idx)
+        },
+        FilterType::IsNull => {
+            format!("\"{}\" IS NULL", filter.column_name)
+        },
+        FilterType::IsNotNull => {
+            format!("\"{}\" IS NOT NULL", filter.column_name)
+        },
+    };
+
+    Ok(condition)
+}
+
+async fn execute_query(pool: &PgPool, sql: &str, bind_values: &[String]) -> Result<Vec<QueryRow>, sqlx::Error> {
+    let mut query = sqlx::query(sql);
+
+    // Bind all parameters
+    for value in bind_values {
+        query = query.bind(value);
+    }
+
+    let rows = query.fetch_all(pool).await?;
+
+    let results = rows.into_iter().map(|row| {
+        QueryRow {
+            id: row.try_get("id").unwrap_or(0),
+            content_json: row.try_get::<serde_json::Value, _>("data")
+                .unwrap_or(serde_json::Value::Null)
+                .to_string(),
+        }
+    }).collect();
+
+    Ok(results)
+}
+
+async fn execute_count_query(pool: &PgPool, sql: &str, bind_values: &[String]) -> Result<i32, sqlx::Error> {
+    let mut query = sqlx::query(sql);
+
+    // Bind all parameters
+    for value in bind_values {
+        query = query.bind(value);
+    }
+
+    let row = query.fetch_one(pool).await?;
+    let count: i64 = row.try_get(0).unwrap_or(0);
+
+    Ok(count as i32)
+}