Implement reactive-rendering for text_editor

widget/src/text_editor.rs

@@ -119,6 +119,7 @@ pub struct TextEditor<
         &Highlighter::Highlight,
         &Theme,
     ) -> highlighter::Format<Renderer::Font>,
+    last_status: Option<Status>,
 }
 
 impl<'a, Message, Theme, Renderer>
@@ -146,6 +147,7 @@ where
             highlighter_format: |_highlight, _theme| {
                 highlighter::Format::default()
             },
+            last_status: None,
         }
     }
 }
@@ -269,6 +271,7 @@ where
             on_edit: self.on_edit,
             highlighter_settings: settings,
             highlighter_format: to_format,
+            last_status: self.last_status,
         }
     }
 
@@ -611,6 +614,10 @@ where
         };
 
         let state = tree.state.downcast_mut::<State<Highlighter>>();
+        let is_redraw = matches!(
+            event,
+            Event::Window(window::Event::RedrawRequested(_now)),
+        );
 
         match event {
             Event::Window(window::Event::Unfocused) => {
@@ -647,16 +654,15 @@ where
             _ => {}
         }
 
-        let Some(update) = Update::from_event(
+        if let Some(update) = Update::from_event(
             event,
             state,
             layout.bounds(),
             self.padding,
             cursor,
             self.key_binding.as_deref(),
-        ) else {
-            return;
-        };
+        ) {
+            shell.capture_event();
 
             match update {
                 Update::Click(click) => {
@@ -707,7 +713,8 @@ where
                         clipboard: &mut dyn Clipboard,
                         shell: &mut Shell<'_, Message>,
                     ) {
-                    let mut publish = |action| shell.publish(on_edit(action));
+                        let mut publish =
+                            |action| shell.publish(on_edit(action));
 
                         match binding {
                             Binding::Unfocus => {
@@ -736,9 +743,9 @@ where
                                 if let Some(contents) =
                                     clipboard.read(clipboard::Kind::Standard)
                                 {
-                                publish(Action::Edit(Edit::Paste(Arc::new(
-                                    contents,
-                                ))));
+                                    publish(Action::Edit(Edit::Paste(
+                                        Arc::new(contents),
+                                    )));
                                 }
                             }
                             Binding::Move(motion) => {
@@ -796,8 +803,31 @@ where
                     }
                 }
             }
+        }
 
-        shell.capture_event();
+        let status = {
+            let is_disabled = self.on_edit.is_none();
+            let is_hovered = cursor.is_over(layout.bounds());
+
+            if is_disabled {
+                Status::Disabled
+            } else if state.focus.is_some() {
+                Status::Focused { is_hovered }
+            } else if is_hovered {
+                Status::Hovered
+            } else {
+                Status::Active
+            }
+        };
+
+        if is_redraw {
+            self.last_status = Some(status);
+        } else if self
+            .last_status
+            .is_some_and(|last_status| status != last_status)
+        {
+            shell.request_redraw();
+        }
     }
 
     fn draw(
@@ -807,7 +837,7 @@ where
         theme: &Theme,
         _defaults: &renderer::Style,
         layout: Layout<'_>,
-        cursor: mouse::Cursor,
+        _cursor: mouse::Cursor,
         _viewport: &Rectangle,
     ) {
         let bounds = layout.bounds();
@@ -823,20 +853,8 @@ where
             |highlight| (self.highlighter_format)(highlight, theme),
         );
 
-        let is_disabled = self.on_edit.is_none();
-        let is_mouse_over = cursor.is_over(bounds);
-
-        let status = if is_disabled {
-            Status::Disabled
-        } else if state.focus.is_some() {
-            Status::Focused
-        } else if is_mouse_over {
-            Status::Hovered
-        } else {
-            Status::Active
-        };
-
-        let style = theme.style(&self.class, status);
+        let style = theme
+            .style(&self.class, self.last_status.unwrap_or(Status::Active));
 
         renderer.fill_quad(
             renderer::Quad {
@@ -1035,7 +1053,7 @@ impl<Message> Binding<Message> {
             status,
         } = event;
 
-        if status != Status::Focused {
+        if !matches!(status, Status::Focused { .. }) {
             return None;
         }
 
@@ -1175,7 +1193,9 @@ impl<Message> Update<Message> {
                 ..
             }) => {
                 let status = if state.focus.is_some() {
-                    Status::Focused
+                    Status::Focused {
+                        is_hovered: cursor.is_over(bounds),
+                    }
                 } else {
                     Status::Active
                 };
@@ -1221,7 +1241,10 @@ pub enum Status {
     /// The [`TextEditor`] is being hovered.
     Hovered,
     /// The [`TextEditor`] is focused.
-    Focused,
+    Focused {
+        /// Whether the [`TextEditor`] is hovered, while focused.
+        is_hovered: bool,
+    },
     /// The [`TextEditor`] cannot be interacted with.
     Disabled,
 }
@@ -1296,7 +1319,7 @@ pub fn default(theme: &Theme, status: Status) -> Style {
             },
             ..active
         },
-        Status::Focused => Style {
+        Status::Focused { .. } => Style {
             border: Border {
                 color: palette.primary.strong.color,
                 ..active.border