ui/base/x/x11_menu_list.h

   1 // Copyright (c) 2014 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_BASE_X_X11_MENU_LIST_H_
   6 #define UI_BASE_X_X11_MENU_LIST_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11 #include "ui/base/ui_base_export.h"
  12 #include "ui/gfx/x/x11_types.h"
  13
  14 // A process wide singleton cache for X menus.
  15 template <typename T> struct DefaultSingletonTraits;
  16
  17 namespace ui {
  18
  19 // Keeps track of created and destroyed top level menu windows.
  20 class UI_BASE_EXPORT XMenuList {
  21  public:
  22   static XMenuList* GetInstance();
  23
  24   // Checks if |menu| has _NET_WM_WINDOW_TYPE property set to
  25   // "_NET_WM_WINDOW_TYPE_MENU" atom and if so caches it.
  26   void MaybeRegisterMenu(XID menu);
  27
  28   // Finds |menu| in cache and if found removes it.
  29   void MaybeUnregisterMenu(XID menu);
  30
  31   // Inserts cached menu XIDs at the beginning of |stack|.
  32   void InsertMenuWindowXIDs(std::vector<XID>* stack);
  33
  34  private:
  35   friend struct DefaultSingletonTraits<XMenuList>;
  36   XMenuList();
  37   ~XMenuList();
  38
  39   std::vector<XID> menus_;
  40   XAtom menu_type_atom_;
  41   DISALLOW_COPY_AND_ASSIGN(XMenuList);
  42 };
  43
  44 }  // namespace ui
  45
  46 #endif  // UI_BASE_X_X11_MENU_LIST_H_