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
10namespace views {
11
12class MenuController;
13class 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.
21class MenuHostRootView : public internal::RootView {
22 public:
23  MenuHostRootView(Widget* widget, SubmenuView* submenu);
24
25  void ClearSubmenu() { submenu_ = NULL; }
26
27  // Overridden from View:
28  virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
29  virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
30  virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
31  virtual void OnMouseMoved(const ui::MouseEvent& event) OVERRIDE;
32  virtual bool OnMouseWheel(const ui::MouseWheelEvent& event) OVERRIDE;
33
34 private:
35  // ui::EventProcessor:
36  virtual ui::EventDispatchDetails OnEventFromSource(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_
56