Notify widgets of window focus change

linebender · Oct 21, 2021 · 1434138 · 1434138
1 parent 0c0851f
commit 1434138
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Showing 3 changed files with 12 additions and 0 deletions.
diff --git a/druid/src/core.rs b/druid/src/core.rs
@@ -725,6 +725,7 @@ impl<T: Data, W: Widget<T>> WidgetPod<T, W> {
                 }
                 true
             }
+            Event::WindowFocus(_) => true,
             Event::WindowSize(_) => {
                 self.state.needs_layout = true;
                 ctx.is_root

diff --git a/druid/src/event.rs b/druid/src/event.rs
@@ -74,6 +74,8 @@ pub enum Event {
     /// This event means the window *will* go away; it is safe to dispose of resources and
     /// do any other cleanup.
     WindowDisconnected,
+    /// Called when window focus changes.
+    WindowFocus(bool),
     /// Called on the root widget when the window size changes.
     ///
     /// Discussion: it's not obvious this should be propagated to user
@@ -431,6 +433,7 @@ impl Event {
             Event::WindowConnected
             | Event::WindowCloseRequested
             | Event::WindowDisconnected
+            | Event::WindowFocus(_)
             | Event::WindowSize(_)
             | Event::Timer(_)
             | Event::AnimFrame(_)

diff --git a/druid/src/win_handler.rs b/druid/src/win_handler.rs
@@ -977,6 +977,14 @@ impl<T: Data> WinHandler for DruidHandler<T> {
 
     fn got_focus(&mut self) {
         self.app_state.window_got_focus(self.window_id);
+
+        let event = Event::WindowFocus(true);
+        self.app_state.do_window_event(event, self.window_id);
+    }
+
+    fn lost_focus(&mut self) {
+        let event = Event::WindowFocus(false);
+        self.app_state.do_window_event(event, self.window_id);
     }
 
     fn timer(&mut self, token: TimerToken) {