Enable keyboard accelerators while a menu is open

ui/views/controls/menu/menu_message_loop_aura.cc

Index: ui/views/controls/menu/menu_message_loop_aura.cc
diff --git a/ui/views/controls/menu/menu_message_loop_aura.cc b/ui/views/controls/menu/menu_message_loop_aura.cc
index 3ed33281aa6f43e8b99a301acb33af9aef39515f..f1e2c9dc5ffdffa9d1537bed93c842fcedbb0a2d 100644
--- a/ui/views/controls/menu/menu_message_loop_aura.cc
+++ b/ui/views/controls/menu/menu_message_loop_aura.cc
@@ -18,6 +18,7 @@
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/events/platform/scoped_event_dispatcher.h"
 #include "ui/views/controls/menu/menu_controller.h"
+#include "ui/views/controls/menu/menu_event_filter.h"
 #include "ui/views/widget/widget.h"
 #include "ui/wm/public/activation_change_observer.h"
 #include "ui/wm/public/activation_client.h"
@@ -103,7 +104,7 @@ MenuMessageLoop* MenuMessageLoop::Create() {
   return new MenuMessageLoopAura;
 }
 
-MenuMessageLoopAura::MenuMessageLoopAura() : owner_(NULL) {
+MenuMessageLoopAura::MenuMessageLoopAura() : owner_(nullptr) {
 }
 
 MenuMessageLoopAura::~MenuMessageLoopAura() {
@@ -157,29 +158,32 @@ void MenuMessageLoopAura::Run(MenuController* controller,
     run_loop.Run();
   }
 #else
-  internal::MenuEventDispatcher event_dispatcher(controller);
-  scoped_ptr<ui::ScopedEventDispatcher> dispatcher_override;
-  if (ui::PlatformEventSource::GetInstance()) {
-    dispatcher_override =
-        ui::PlatformEventSource::GetInstance()->OverrideDispatcher(
-            &event_dispatcher);
-  }
+  scoped_ptr<ActivationChangeObserverImpl> observer;
   if (root) {
-    scoped_ptr<ActivationChangeObserverImpl> observer;
     if (!nested_menu)
       observer.reset(new ActivationChangeObserverImpl(controller, root));
-    aura::client::DispatcherRunLoop run_loop(
-        aura::client::GetDispatcherClient(root), NULL);
-    message_loop_quit_ = run_loop.QuitClosure();
-    run_loop.Run();
-  } else {
-    base::MessageLoopForUI* loop = base::MessageLoopForUI::current();
-    base::MessageLoop::ScopedNestableTaskAllower allow(loop);
-    base::RunLoop run_loop;
-    message_loop_quit_ = run_loop.QuitClosure();
-    run_loop.Run();
   }
-#endif
+
+  scoped_ptr<MenuEventFilter> menu_event_filter;
+  if (!nested_menu) {
+    // No need to recreate the MenuEventFilter for every nested menu.
+    menu_event_filter.reset(new MenuEventFilter);
+    aura::Env::GetInstanceDontCreate()->PrependPreTargetHandler(
+        menu_event_filter.get());

[oshima, 2015/09/08 21:43:08]

You can add/remove the filter in MenuEventFilter's ctor/dtor?

[afakhry, 2015/09/08 23:34:38]

Done.

+  }
+
+  base::MessageLoopForUI* loop = base::MessageLoopForUI::current();
+  base::MessageLoop::ScopedNestableTaskAllower allow(loop);
+  base::RunLoop run_loop;
+  message_loop_quit_ = run_loop.QuitClosure();
+
+  run_loop.Run();
+
+  if (menu_event_filter.get()) {
+    aura::Env::GetInstanceDontCreate()->RemovePreTargetHandler(
+        menu_event_filter.get());
+  }
+#endif  // defined(OS_WIN)
 }
 
 void MenuMessageLoopAura::QuitNow() {