Turn Bookmark Menus Async

ui/views/controls/menu/menu_pre_target_handler.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_VIEWS_CONTROLS_MENU_PRE_TARGET_HANDLER_H_
+#define UI_VIEWS_CONTROLS_MENU_PRE_TARGET_HANDLER_H_
+
+#include "ui/aura/window_observer.h"
+#include "ui/events/event_handler.h"
+#include "ui/views/views_export.h"
+#include "ui/wm/public/activation_change_observer.h"
+
+namespace aura {
+class Window;
+}  // namespace aura
+
+namespace views {
+
+class MenuController;
+class Widget;
+
+// MenuPreTargetHandler is used to observe activation changes, cancel events,
+// and root window destruction, to shutdown the menu.
+//
+// Additionally handles key events to provide accelerator support to menus.
+class VIEWS_EXPORT MenuPreTargetHandler
+    : public aura::client::ActivationChangeObserver,
+      public aura::WindowObserver,
+      public ui::EventHandler {
+ public:
+  MenuPreTargetHandler(MenuController* controller, Widget* owner);
+  ~MenuPreTargetHandler() override;
+
+  // aura::client:ActivationChangeObserver:
+  void OnWindowActivated(
+      aura::client::ActivationChangeObserver::ActivationReason reason,
+      aura::Window* gained_active,
+      aura::Window* lost_active) override;
+
+  // aura::WindowObserver:
+  void OnWindowDestroying(aura::Window* window) override;
+
+  // ui::EventHandler:
+  void OnCancelMode(ui::CancelModeEvent* event) override;
+  void OnKeyEvent(ui::KeyEvent* event) override;
+
+ private:
+  void Cleanup();
+
+  MenuController* controller_;
+  aura::Window* root_;
+
+  DISALLOW_COPY_AND_ASSIGN(MenuPreTargetHandler);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_CONTROLS_MENU_PRE_TARGET_HANDLER_H_