canvas compiled for the first time

canvas/src/state.rs

@@ -0,0 +1,64 @@
+// canvas/src/state.rs
+
+/// Context passed to feature-specific action handlers
+#[derive(Debug)]
+pub struct ActionContext {
+    pub key_code: Option<crossterm::event::KeyCode>,
+    pub ideal_cursor_column: usize,
+    pub current_input: String,
+    pub current_field: usize,
+}
+
+/// Core trait that any form-like state must implement to work with the canvas system.
+/// This enables the same mode behaviors (edit, read-only, highlight) to work across
+/// any implementation - login forms, data entry forms, configuration screens, etc.
+pub trait CanvasState {
+    // --- Core Navigation ---
+    fn current_field(&self) -> usize;
+    fn current_cursor_pos(&self) -> usize;
+    fn set_current_field(&mut self, index: usize);
+    fn set_current_cursor_pos(&mut self, pos: usize);
+
+    // --- Data Access ---
+    fn get_current_input(&self) -> &str;
+    fn get_current_input_mut(&mut self) -> &mut String;
+    fn inputs(&self) -> Vec<&String>;
+    fn fields(&self) -> Vec<&str>;
+
+    // --- State Management ---
+    fn has_unsaved_changes(&self) -> bool;
+    fn set_has_unsaved_changes(&mut self, changed: bool);
+
+    // --- Autocomplete/Suggestions (Optional) ---
+    fn get_suggestions(&self) -> Option<&[String]> {
+        None
+    }
+    fn get_selected_suggestion_index(&self) -> Option<usize> {
+        None
+    }
+    fn set_selected_suggestion_index(&mut self, _index: Option<usize>) {
+        // Default: no-op (override if you support suggestions)
+    }
+    fn activate_suggestions(&mut self, _suggestions: Vec<String>) {
+        // Default: no-op (override if you support suggestions)
+    }
+    fn deactivate_suggestions(&mut self) {
+        // Default: no-op (override if you support suggestions)  
+    }
+    
+    // --- Feature-specific action handling ---
+    fn handle_feature_action(&mut self, action: &str, context: &ActionContext) -> Option<String> {
+        None // Default: no feature-specific handling
+    }
+
+    // --- Display Overrides (for links, computed values, etc.) ---
+    fn get_display_value_for_field(&self, index: usize) -> &str {
+        self.inputs()
+            .get(index)
+            .map(|s| s.as_str())
+            .unwrap_or("")
+    }
+    fn has_display_override(&self, _index: usize) -> bool {
+        false
+    }
+}