canvas compiled for the first time

canvas/src/modes/manager.rs

@@ -0,0 +1,34 @@
+// src/modes/handlers/mode_manager.rs
+// canvas/src/modes/manager.rs
+
+use crate::modes::highlight::HighlightState;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum AppMode {
+    General,   // For intro and admin screens
+    ReadOnly,  // Canvas read-only mode
+    Edit,      // Canvas edit mode
+    Highlight, // Canvas highlight/visual mode
+    Command,   // Command mode overlay
+}
+
+pub struct ModeManager;
+
+impl ModeManager {
+    // Mode transition rules
+    pub fn can_enter_command_mode(current_mode: AppMode) -> bool {
+        !matches!(current_mode, AppMode::Edit)
+    }
+
+    pub fn can_enter_edit_mode(current_mode: AppMode) -> bool {
+        matches!(current_mode, AppMode::ReadOnly)
+    }
+
+    pub fn can_enter_read_only_mode(current_mode: AppMode) -> bool {
+        matches!(current_mode, AppMode::Edit | AppMode::Command | AppMode::Highlight)
+    }
+
+    pub fn can_enter_highlight_mode(current_mode: AppMode) -> bool {
+        matches!(current_mode, AppMode::ReadOnly)
+    }
+}