Introduce close_requested for multi-window

examples/multi_window/src/main.rs

@@ -250,6 +250,10 @@ impl Application for Example {
             .collect()
     }
 
+    fn close_requested(&self, window: window::Id) -> Self::Message {
+        Message::Window(window, WindowMessage::CloseWindow)
+    }
+
     fn view(&self, window_id: window::Id) -> Element<Message> {
         if let Some(window) = self.windows.get(&window_id) {
             let focus = window.focus;

src/multi_window/application.rs

@@ -113,6 +113,9 @@ pub trait Application: Sized {
         false
     }
 
+    /// TODO(derezzedex)
+    fn close_requested(&self, window: window::Id) -> Self::Message;
+
     /// Runs the [`Application`].
     ///
     /// On native platforms, this method will take control of the current thread
@@ -207,4 +210,8 @@ where
     fn should_exit(&self) -> bool {
         self.0.should_exit()
     }
+
+    fn close_requested(&self, window: window::Id) -> Self::Message {
+        self.0.close_requested(window)
+    }
 }

winit/src/multi_window.rs

@@ -147,6 +147,9 @@ where
     fn should_exit(&self) -> bool {
         false
     }
+
+    /// TODO(derezzedex)
+    fn close_requested(&self, window: window::Id) -> Self::Message;
 }
 
 /// Runs an [`Application`] with an executor, compositor, and the provided
@@ -296,7 +299,7 @@ async fn run_instance<A, E, C>(
     >,
     init_command: Command<A::Message>,
     mut windows: HashMap<window::Id, winit::window::Window>,
-    exit_on_close_request: bool,
+    _exit_on_close_request: bool,
 ) where
     A: Application + 'static,
     E: Executor + 'static,
@@ -684,9 +687,13 @@ async fn run_instance<A, E, C>(
                         if requests_exit(
                             &window_event,
                             window_state.state.modifiers(),
-                        ) && exit_on_close_request
+                        ) {
+                            if let Some(id) =
+                                window_ids.get(&window_id).cloned()
                             {
-                            break;
+                                let message = application.close_requested(id);
+                                messages.push(message);
+                            }
                         }
 
                         window_state.state.update(

winit/src/settings.rs

@@ -46,6 +46,10 @@ pub struct Settings<Flags> {
     /// Whether the [`Application`] should exit when the user requests the
     /// window to close (e.g. the user presses the close button).
     ///
+    /// NOTE: This is not used for `multi-window`, instead check [`Application::close_requested`].
+    ///
+    /// [`close_requested`]: crate::multi_window::Application::close_requested
+    ///
     /// [`Application`]: crate::Application
     pub exit_on_close_request: bool,