first textarea implementation
This commit is contained in:
Priec
585
canvas/examples/canvas_textarea_cursor_auto.rs
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585
canvas/examples/canvas_textarea_cursor_auto.rs
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@@ -0,0 +1,585 @@
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// examples/canvas_textarea_cursor_auto.rs
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//! Demonstrates automatic cursor management with the textarea widget
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//!
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//! This example REQUIRES the `cursor-style` and `textarea` features to compile.
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//!
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//! Run with:
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//! cargo run --example canvas_textarea_cursor_auto --features "gui,cursor-style,textarea"
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// REQUIRE cursor-style and textarea features
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#[cfg(not(feature = "cursor-style"))]
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compile_error!(
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"This example requires the 'cursor-style' feature. \
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Run with: cargo run --example canvas_textarea_cursor_auto --features \"gui,cursor-style,textarea\""
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);
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#[cfg(not(feature = "textarea"))]
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compile_error!(
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"This example requires the 'textarea' feature. \
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Run with: cargo run --example canvas_textarea_cursor_auto --features \"gui,cursor-style,textarea\""
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);
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use std::io;
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use crossterm::{
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event::{
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self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyEvent, KeyEventKind, KeyModifiers,
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},
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execute,
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terminal::{
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disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
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},
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};
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use ratatui::{
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backend::{Backend, CrosstermBackend},
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layout::{Constraint, Direction, Layout},
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style::{Color, Style},
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text::{Line, Span},
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widgets::{Block, Borders, Paragraph},
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Frame, Terminal,
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};
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use canvas::{
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canvas::{
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modes::AppMode,
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CursorManager, // This import only exists when cursor-style feature is enabled
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},
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textarea::{TextArea, TextAreaState},
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};
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/// Enhanced TextArea that demonstrates automatic cursor management
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struct AutoCursorTextArea {
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textarea: TextAreaState,
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has_unsaved_changes: bool,
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debug_message: String,
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mode: AppMode,
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command_buffer: String,
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}
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impl AutoCursorTextArea {
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fn new() -> Self {
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let initial_text = "🎯 Automatic Cursor Management Demo\n\
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Welcome to the textarea cursor demo!\n\
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\n\
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Try different modes:\n\
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• Normal mode: Block cursor █\n\
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• Insert mode: Bar cursor |\n\
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\n\
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Navigation commands:\n\
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• hjkl or arrow keys: move cursor\n\
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• i: enter insert mode\n\
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• Esc: return to normal mode\n\
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\n\
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Watch how the terminal cursor changes automatically!\n\
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This text can be edited when in insert mode.\n\
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\n\
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Press ? for help, F1/F2 for manual cursor control demo.";
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let mut textarea = TextAreaState::from_text(initial_text);
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textarea.set_placeholder("Start typing...");
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Self {
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textarea,
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has_unsaved_changes: false,
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debug_message: "🎯 Automatic Cursor Demo - cursor-style feature enabled!".to_string(),
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mode: AppMode::ReadOnly,
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command_buffer: String::new(),
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}
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}
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// === MODE TRANSITIONS WITH AUTOMATIC CURSOR MANAGEMENT ===
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fn enter_insert_mode(&mut self) -> std::io::Result<()> {
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self.mode = AppMode::Edit;
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CursorManager::update_for_mode(AppMode::Edit)?; // 🎯 Automatic: cursor becomes bar |
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self.debug_message = "✏️ INSERT MODE - Cursor: Steady Bar |".to_string();
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Ok(())
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}
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fn enter_append_mode(&mut self) -> std::io::Result<()> {
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// Move cursor to end of current line, then enter insert mode
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self.send_key_to_textarea(KeyCode::End, KeyModifiers::NONE);
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self.enter_insert_mode()
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}
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fn exit_to_normal_mode(&mut self) -> std::io::Result<()> {
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self.mode = AppMode::ReadOnly;
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CursorManager::update_for_mode(AppMode::ReadOnly)?; // 🎯 Automatic: cursor becomes steady block
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self.debug_message = "🔒 NORMAL MODE - Cursor: Steady Block █".to_string();
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Ok(())
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}
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// === MANUAL CURSOR OVERRIDE DEMONSTRATION ===
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fn demo_manual_cursor_control(&mut self) -> std::io::Result<()> {
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// Users can still manually control cursor if needed
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CursorManager::update_for_mode(AppMode::Command)?;
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self.debug_message = "🔧 Manual override: Command cursor _".to_string();
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Ok(())
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}
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fn restore_automatic_cursor(&mut self) -> std::io::Result<()> {
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// Restore automatic cursor based on current mode
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CursorManager::update_for_mode(self.mode)?;
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self.debug_message = "🎯 Restored automatic cursor management".to_string();
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Ok(())
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}
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// === TEXTAREA OPERATIONS ===
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fn handle_textarea_input(&mut self, key: KeyEvent) {
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self.textarea.input(key);
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if key.code != KeyCode::Left && key.code != KeyCode::Right
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&& key.code != KeyCode::Up && key.code != KeyCode::Down
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&& key.code != KeyCode::Home && key.code != KeyCode::End {
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self.has_unsaved_changes = true;
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}
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}
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fn send_key_to_textarea(&mut self, code: KeyCode, modifiers: KeyModifiers) {
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let key_event = KeyEvent {
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code,
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modifiers,
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kind: KeyEventKind::Press,
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state: crossterm::event::KeyEventState::NONE,
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};
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self.textarea.input(key_event);
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}
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// === MOVEMENT OPERATIONS (for normal mode) ===
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fn move_left(&mut self) {
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self.send_key_to_textarea(KeyCode::Left, KeyModifiers::NONE);
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self.update_debug_for_movement("← left");
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}
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fn move_right(&mut self) {
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self.send_key_to_textarea(KeyCode::Right, KeyModifiers::NONE);
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self.update_debug_for_movement("→ right");
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}
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fn move_up(&mut self) {
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self.send_key_to_textarea(KeyCode::Up, KeyModifiers::NONE);
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self.update_debug_for_movement("↑ up");
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}
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fn move_down(&mut self) {
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self.send_key_to_textarea(KeyCode::Down, KeyModifiers::NONE);
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self.update_debug_for_movement("↓ down");
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}
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fn move_word_next(&mut self) {
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// Use Alt+f for word forward (from textarea implementation)
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self.send_key_to_textarea(KeyCode::Char('f'), KeyModifiers::ALT);
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self.update_debug_for_movement("w: next word");
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}
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fn move_word_prev(&mut self) {
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// Use Alt+b for word backward (from textarea implementation)
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self.send_key_to_textarea(KeyCode::Char('b'), KeyModifiers::ALT);
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self.update_debug_for_movement("b: previous word");
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}
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fn move_word_end(&mut self) {
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// Use Alt+e for word end (from textarea implementation)
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self.send_key_to_textarea(KeyCode::Char('e'), KeyModifiers::ALT);
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self.update_debug_for_movement("e: word end");
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}
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fn move_line_start(&mut self) {
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self.send_key_to_textarea(KeyCode::Home, KeyModifiers::NONE);
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self.update_debug_for_movement("0: line start");
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}
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fn move_line_end(&mut self) {
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self.send_key_to_textarea(KeyCode::End, KeyModifiers::NONE);
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self.update_debug_for_movement("$: line end");
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}
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fn move_first_line(&mut self) {
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// Move to very beginning of text
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self.send_key_to_textarea(KeyCode::Char('a'), KeyModifiers::CONTROL);
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self.update_debug_for_movement("gg: first line");
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}
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fn move_last_line(&mut self) {
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// Move to very end of text
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self.send_key_to_textarea(KeyCode::Char('e'), KeyModifiers::CONTROL);
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self.update_debug_for_movement("G: last line");
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}
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fn update_debug_for_movement(&mut self, action: &str) {
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self.debug_message = action.to_string();
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}
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// === DELETE OPERATIONS ===
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fn delete_char_forward(&mut self) {
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self.send_key_to_textarea(KeyCode::Delete, KeyModifiers::NONE);
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self.has_unsaved_changes = true;
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self.debug_message = "x: deleted character".to_string();
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}
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fn delete_char_backward(&mut self) {
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self.send_key_to_textarea(KeyCode::Backspace, KeyModifiers::NONE);
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self.has_unsaved_changes = true;
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self.debug_message = "X: deleted character backward".to_string();
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}
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// === COMMAND BUFFER HANDLING ===
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fn clear_command_buffer(&mut self) {
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self.command_buffer.clear();
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}
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fn add_to_command_buffer(&mut self, ch: char) {
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self.command_buffer.push(ch);
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}
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fn get_command_buffer(&self) -> &str {
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&self.command_buffer
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}
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fn has_pending_command(&self) -> bool {
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!self.command_buffer.is_empty()
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}
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// === GETTERS ===
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fn mode(&self) -> AppMode {
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self.mode
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}
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fn debug_message(&self) -> &str {
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&self.debug_message
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}
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fn has_unsaved_changes(&self) -> bool {
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self.has_unsaved_changes
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}
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fn set_debug_message(&mut self, msg: String) {
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self.debug_message = msg;
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}
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fn get_cursor_info(&self) -> String {
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// Since we can't access the internal editor, we'll provide a simpler status
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format!("Textarea cursor positioned")
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}
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}
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/// Handle key press with automatic cursor management
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fn handle_key_press(
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key_event: KeyEvent,
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editor: &mut AutoCursorTextArea,
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) -> anyhow::Result<bool> {
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let KeyEvent { code: key, modifiers, .. } = key_event;
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let mode = editor.mode();
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// Quit handling
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if (key == KeyCode::Char('q') && modifiers.contains(KeyModifiers::CONTROL))
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|| (key == KeyCode::Char('c') && modifiers.contains(KeyModifiers::CONTROL))
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|| key == KeyCode::F(10)
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{
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return Ok(false);
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}
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match (mode, key, modifiers) {
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// === MODE TRANSITIONS WITH AUTOMATIC CURSOR MANAGEMENT ===
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(AppMode::ReadOnly, KeyCode::Char('i'), _) => {
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editor.enter_insert_mode()?;
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('a'), _) => {
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editor.enter_append_mode()?;
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('A'), _) => {
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editor.move_line_end();
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editor.enter_insert_mode()?;
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editor.clear_command_buffer();
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}
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// Escape: Exit any mode back to normal
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(AppMode::Edit, KeyCode::Esc, _) => {
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editor.exit_to_normal_mode()?;
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}
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// === INSERT MODE: Pass to textarea ===
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(AppMode::Edit, _, _) => {
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editor.handle_textarea_input(key_event);
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}
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// === CURSOR MANAGEMENT DEMONSTRATION ===
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(AppMode::ReadOnly, KeyCode::F(1), _) => {
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editor.demo_manual_cursor_control()?;
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}
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(AppMode::ReadOnly, KeyCode::F(2), _) => {
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editor.restore_automatic_cursor()?;
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}
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// === MOVEMENT: VIM-STYLE NAVIGATION (Normal mode) ===
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(AppMode::ReadOnly, KeyCode::Char('h'), _)
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| (AppMode::ReadOnly, KeyCode::Left, _) => {
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editor.move_left();
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('l'), _)
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| (AppMode::ReadOnly, KeyCode::Right, _) => {
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editor.move_right();
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('j'), _)
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| (AppMode::ReadOnly, KeyCode::Down, _) => {
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editor.move_down();
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('k'), _)
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| (AppMode::ReadOnly, KeyCode::Up, _) => {
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editor.move_up();
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editor.clear_command_buffer();
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}
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// Word movement
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(AppMode::ReadOnly, KeyCode::Char('w'), _) => {
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editor.move_word_next();
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('b'), _) => {
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editor.move_word_prev();
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('e'), _) => {
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if editor.get_command_buffer() == "g" {
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// TODO: Implement ge (previous word end)
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editor.move_word_prev();
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editor.set_debug_message("ge: previous word end (simplified)".to_string());
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editor.clear_command_buffer();
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} else {
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editor.move_word_end();
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editor.clear_command_buffer();
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}
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}
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// Line movement
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(AppMode::ReadOnly, KeyCode::Char('0'), _)
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| (AppMode::ReadOnly, KeyCode::Home, _) => {
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editor.move_line_start();
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('$'), _)
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| (AppMode::ReadOnly, KeyCode::End, _) => {
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editor.move_line_end();
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editor.clear_command_buffer();
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}
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// Document movement with command buffer
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(AppMode::ReadOnly, KeyCode::Char('g'), _) => {
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if editor.get_command_buffer() == "g" {
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editor.move_first_line();
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editor.clear_command_buffer();
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} else {
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editor.clear_command_buffer();
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editor.add_to_command_buffer('g');
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editor.set_debug_message("g".to_string());
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}
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}
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(AppMode::ReadOnly, KeyCode::Char('G'), _) => {
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editor.move_last_line();
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editor.clear_command_buffer();
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}
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// === DELETE OPERATIONS (Normal mode) ===
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(AppMode::ReadOnly, KeyCode::Char('x'), _) => {
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editor.delete_char_forward();
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editor.clear_command_buffer();
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}
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(AppMode::ReadOnly, KeyCode::Char('X'), _) => {
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editor.delete_char_backward();
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editor.clear_command_buffer();
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}
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// === DEBUG/INFO COMMANDS ===
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(AppMode::ReadOnly, KeyCode::Char('?'), _) => {
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editor.set_debug_message(format!(
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"{}, Mode: {:?} - Cursor managed automatically!",
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editor.get_cursor_info(),
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mode
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));
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editor.clear_command_buffer();
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}
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_ => {
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if editor.has_pending_command() {
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editor.clear_command_buffer();
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editor.set_debug_message("Invalid command sequence".to_string());
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} else {
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editor.set_debug_message(format!(
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"Unhandled: {:?} + {:?} in {:?} mode",
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key, modifiers, mode
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));
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}
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}
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}
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Ok(true)
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}
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fn run_app<B: Backend>(
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terminal: &mut Terminal<B>,
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mut editor: AutoCursorTextArea,
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) -> io::Result<()> {
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loop {
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terminal.draw(|f| ui(f, &mut editor))?;
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if let Event::Key(key) = event::read()? {
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match handle_key_press(key, &mut editor) {
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Ok(should_continue) => {
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if !should_continue {
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break;
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}
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}
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Err(e) => {
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editor.set_debug_message(format!("Error: {}", e));
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}
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}
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}
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}
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Ok(())
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}
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fn ui(f: &mut Frame, editor: &mut AutoCursorTextArea) {
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let chunks = Layout::default()
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.direction(Direction::Vertical)
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.constraints([Constraint::Min(8), Constraint::Length(8)])
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.split(f.area());
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render_textarea(f, chunks[0], editor);
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render_status_and_help(f, chunks[1], editor);
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}
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fn render_textarea(
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f: &mut Frame,
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area: ratatui::layout::Rect,
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editor: &mut AutoCursorTextArea,
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) {
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let block = Block::default()
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.borders(Borders::ALL)
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.title("🎯 Textarea with Automatic Cursor Management");
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let textarea_widget = TextArea::default().block(block.clone());
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f.render_stateful_widget(textarea_widget, area, &mut editor.textarea);
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||||
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||||
// Set cursor position for terminal cursor
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||||
// Always show cursor - CursorManager handles the style (block/bar/blinking)
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let (cx, cy) = editor.textarea.cursor(area, Some(&block));
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f.set_cursor_position((cx, cy));
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||||
}
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||||
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||||
fn render_status_and_help(
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f: &mut Frame,
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||||
area: ratatui::layout::Rect,
|
||||
editor: &AutoCursorTextArea,
|
||||
) {
|
||||
let chunks = Layout::default()
|
||||
.direction(Direction::Vertical)
|
||||
.constraints([Constraint::Length(3), Constraint::Length(5)])
|
||||
.split(area);
|
||||
|
||||
// Status bar with cursor information
|
||||
let mode_text = match editor.mode() {
|
||||
AppMode::Edit => "INSERT | (bar cursor)",
|
||||
AppMode::ReadOnly => "NORMAL █ (block cursor)",
|
||||
AppMode::Highlight => "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(), editor.get_cursor_info())
|
||||
} else {
|
||||
format!("-- {} -- {} | {}", mode_text, editor.debug_message(), editor.get_cursor_info())
|
||||
};
|
||||
|
||||
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]);
|
||||
|
||||
// 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 line, or any other key to cancel",
|
||||
_ => "Pending command... (Esc to cancel)"
|
||||
}
|
||||
} else {
|
||||
"🎯 CURSOR-STYLE DEMO: Normal █ | Insert | \n\
|
||||
Normal: hjkl/arrows=move, w/b/e=words, 0/$=line, g/G=first/last\n\
|
||||
i/a/A=insert, x/X=delete, ?=info\n\
|
||||
F1=demo manual cursor, F2=restore automatic, Ctrl+Q=quit"
|
||||
}
|
||||
}
|
||||
AppMode::Edit => {
|
||||
"🎯 INSERT MODE - Cursor: | (bar)\n\
|
||||
Type to edit text, arrows=move, Enter=new line\n\
|
||||
Esc=normal mode"
|
||||
}
|
||||
AppMode::Highlight => {
|
||||
"🎯 VISUAL MODE - Cursor: █ (blinking block)\n\
|
||||
hjkl/arrows=extend selection\n\
|
||||
Esc=normal mode"
|
||||
}
|
||||
_ => "🎯 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 Textarea Cursor Auto Demo");
|
||||
println!("✅ cursor-style feature: ENABLED");
|
||||
println!("✅ textarea 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 mut editor = AutoCursorTextArea::new();
|
||||
|
||||
// Initialize with normal mode - library automatically sets block cursor
|
||||
editor.exit_to_normal_mode()?;
|
||||
|
||||
let res = run_app(&mut terminal, editor);
|
||||
|
||||
// Reset cursor on exit
|
||||
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(())
|
||||
}
|
||||
Reference in New Issue
Block a user