Add platform::desktop module with EventLoopExt::run_return

src/platform/desktop.rs

@@ -0,0 +1,28 @@
+#![cfg(any(
+    target_os = "windows",
+    target_os = "macos",
+    target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd"
+))]
+
+use {EventLoop, Event, ControlFlow};
+
+/// Additional methods on `EventLoop` that are specific to desktop platforms.
+pub trait EventLoopExtDesktop {
+    type UserEvent;
+    /// Initializes the `winit` event loop.
+    ///
+    /// Unlikes `run`, this function *does* return control flow to the caller when `control_flow`
+    /// is set to `ControlFlow::Exit`.
+    fn run_return<F>(&mut self, event_handler: F)
+        where F: FnMut(Event<Self::UserEvent>, &EventLoop<Self::UserEvent>, &mut ControlFlow);
+}
+
+impl<T> EventLoopExtDesktop for EventLoop<T> {
+    type UserEvent = T;
+
+    fn run_return<F>(&mut self, event_handler: F)
+        where F: FnMut(Event<T>, &EventLoop<T>, &mut ControlFlow)
+    {
+        self.events_loop.run_return(event_handler)
+    }
+}

src/platform/mod.rs

@@ -15,3 +15,5 @@ pub mod ios;
 pub mod macos;
 pub mod unix;
 pub mod windows;
+
+pub mod desktop;