implementation of canvas for multiple pages step 1

client/src/state/canvas_state.rs

@@ -0,0 +1,44 @@
+// src/state/canvas_state.rs
+
+use crate::state::pages::form::FormState;
+
+pub trait CanvasState {
+    fn current_field(&self) -> usize;
+    fn current_cursor_pos(&self) -> usize;
+    fn has_unsaved_changes(&self) -> bool;
+    fn inputs(&self) -> Vec<&String>;
+    fn get_current_input(&self) -> &str;
+    fn get_current_input_mut(&mut self) -> &mut String;
+}
+
+// Implement for FormState (keep existing form.rs code and add this)
+impl CanvasState for FormState {
+    fn current_field(&self) -> usize {
+        self.current_field
+    }
+
+    fn current_cursor_pos(&self) -> usize {
+        self.current_cursor_pos
+    }
+
+    fn has_unsaved_changes(&self) -> bool {
+        self.has_unsaved_changes
+    }
+
+    fn inputs(&self) -> Vec<&String> {
+        self.values.iter().collect()
+    }
+
+    fn get_current_input(&self) -> &str {
+        self.values
+            .get(self.current_field)
+            .map(|s| s.as_str())
+            .unwrap_or("")
+    }
+
+    fn get_current_input_mut(&mut self) -> &mut String {
+        self.values
+            .get_mut(self.current_field)
+            .expect("Invalid current_field index")
+    }
+}

client/src/state/mod.rs

@@ -1,3 +1,4 @@
 // src/state/mod.rs
 pub mod state;
 pub mod pages;
+pub mod canvas_state;