feat(windows): add WindowExtWindows::dispatch

.changes/windows-dispatch-fn.md

@@ -0,0 +1,5 @@
+---
+"tao": patch
+---
+
+Added `dispatch` to `WindowExtWindows` to run a closure on the main thread.

src/platform/windows.rs

@@ -184,6 +184,10 @@ pub trait WindowExtWindows {
   ///
   /// Enabling this mainly flips the orientation of menus and title bar buttons
   fn set_rtl(&self, rtl: bool);
+
+  fn dispatch<F>(&self, function: F)
+  where
+    F: FnMut() + 'static;
 }
 
 impl WindowExtWindows for Window {
@@ -238,6 +242,14 @@ impl WindowExtWindows for Window {
   fn set_rtl(&self, rtl: bool) {
     self.window.set_rtl(rtl)
   }
+
+  #[inline]
+  fn dispatch<F>(&self, function: F)
+  where
+    F: FnMut() + 'static,
+  {
+    self.window.thread_executor.execute_in_thread(function)
+  }
 }
 
 /// Additional methods on `WindowBuilder` that are specific to Windows.

src/platform_impl/windows/event_loop.rs

@@ -494,9 +494,9 @@ impl EventLoopThreadExecutor {
   ///
   /// Note that we use a FnMut instead of a FnOnce because we're too lazy to create an equivalent
   /// to the unstable FnBox.
-  pub(super) fn execute_in_thread<F>(&self, mut function: F)
+  pub(crate) fn execute_in_thread<F>(&self, mut function: F)
   where
-    F: FnMut() + Send + 'static,
+    F: FnMut() + 'static,
   {
     unsafe {
       if self.in_event_loop_thread() {

src/platform_impl/windows/window.rs

@@ -68,7 +68,7 @@ pub struct Window {
   window_state: Arc<Mutex<WindowState>>,
 
   // The events loop proxy.
-  thread_executor: event_loop::EventLoopThreadExecutor,
+  pub(crate) thread_executor: event_loop::EventLoopThreadExecutor,
 }
 
 impl Window {