Add Ctrl+S and indicate when files are dirty

src/file_editor.rs

@@ -22,6 +22,9 @@ pub struct FileEditor {
     title: String,
     pub path: Option<PathBuf>,
     pub buffer: Vec<BufferItem>,
+
+    /// Whether the file has been edited since it was laste saved to disk.
+    pub is_dirty: bool,
 }
 
 #[derive(serde::Deserialize, serde::Serialize)]
@@ -37,6 +40,7 @@ impl FileEditor {
             title: title.into(),
             path: None,
             buffer,
+            is_dirty: false,
         }
     }
 
@@ -69,9 +73,11 @@ impl FileEditor {
             ui.horizontal(|ui| {
                 ui.label("new");
                 if ui.button("text").clicked() {
+                    self.is_dirty = true;
                     self.buffer.push(BufferItem::Text(Default::default()));
                 }
                 if ui.button("writing").clicked() {
+                    self.is_dirty = true;
                     self.buffer
                         .push(BufferItem::Handwriting(Default::default()));
                 }
@@ -138,14 +144,18 @@ impl FileEditor {
 
                 let item_response = ui.allocate_ui(item_size, |ui| match item {
                     BufferItem::Text(text_edit) => {
-                        text_edit.ui(ui);
+                        if text_edit.ui(ui).changed {
+                            self.is_dirty = true;
+                        }
                     }
-                    BufferItem::Handwriting(painting) => {
+                    BufferItem::Handwriting(handwriting) => {
                         let style = HandwritingStyle {
                             animate: preferences.animations,
                             ..HandwritingStyle::from_theme(ui.ctx().theme())
                         };
-                        painting.ui(&style, ui);
+                        if handwriting.ui(&style, ui).changed {
+                            self.is_dirty = true;
+                        }
                     }
                 });
 
@@ -211,10 +221,12 @@ impl FileEditor {
                     Ordering::Greater => {
                         let item = self.buffer.remove(from);
                         self.buffer.insert(to, item);
+                        self.is_dirty = true;
                     }
                     Ordering::Less => {
                         let item = self.buffer.remove(from);
                         self.buffer.insert(to - 1, item);
+                        self.is_dirty = true;
                     }
                     Ordering::Equal => {}
                 }