ui/views/controls/menu/menu_host_root_view.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_VIEWS_CONTROLS_MENU_MENU_HOST_ROOT_VIEW_H_
   6 #define UI_VIEWS_CONTROLS_MENU_MENU_HOST_ROOT_VIEW_H_
   7
   8 #include "ui/views/widget/root_view.h"
   9
  10 namespace views {
  11
  12 class MenuController;
  13 class SubmenuView;
  14
  15 // MenuHostRootView is the RootView of the window showing the menu.
  16 // SubmenuView's scroll view is added as a child of MenuHostRootView.
  17 // MenuHostRootView forwards relevant events to the MenuController.
  18 //
  19 // As all the menu items are owned by the root menu item, care must be taken
  20 // such that when MenuHostRootView is deleted it doesn't delete the menu items.
  21 class MenuHostRootView : public internal::RootView {
  22  public:
  23   MenuHostRootView(Widget* widget, SubmenuView* submenu);
  24
  25   void ClearSubmenu() { submenu_ = NULL; }
  26
  27   // Overridden from View:
  28   bool OnMousePressed(const ui::MouseEvent& event) override;
  29   bool OnMouseDragged(const ui::MouseEvent& event) override;
  30   void OnMouseReleased(const ui::MouseEvent& event) override;
  31   void OnMouseMoved(const ui::MouseEvent& event) override;
  32   bool OnMouseWheel(const ui::MouseWheelEvent& event) override;
  33
  34  private:
  35   // ui::EventProcessor:
  36   void OnEventProcessingFinished(ui::Event* event) override;
  37
  38   // Returns the MenuController for this MenuHostRootView.
  39   MenuController* GetMenuController();
  40
  41   // Returns true if event targets EmptyMenu.
  42   bool DoesEventTargetEmptyMenuItem(const ui::MouseEvent& event);
  43
  44   // The SubmenuView we contain.
  45   SubmenuView* submenu_;
  46
  47   // Whether mouse dragged/released should be forwarded to the MenuController.
  48   bool forward_drag_to_menu_controller_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(MenuHostRootView);
  51 };
  52
  53 }  // namespace views
  54
  55 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_HOST_ROOT_VIEW_H_