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 typedef unsigned long Atom;
  15
  16 // A process wide singleton cache for X menus.
  17 template <typename T> struct DefaultSingletonTraits;
  18
  19 namespace ui {
  20
  21 // Keeps track of created and destroyed top level menu windows.
  22 class UI_BASE_EXPORT XMenuList {
  23  public:
  24   static XMenuList* GetInstance();
  25
  26   // Checks if |menu| has _NET_WM_WINDOW_TYPE property set to
  27   // "_NET_WM_WINDOW_TYPE_MENU" atom and if so caches it.
  28   void MaybeRegisterMenu(XID menu);
  29
  30   // Finds |menu| in cache and if found removes it.
  31   void MaybeUnregisterMenu(XID menu);
  32
  33   // Inserts cached menu XIDs at the beginning of |stack|.
  34   void InsertMenuWindowXIDs(std::vector<XID>* stack);
  35
  36  private:
  37   friend struct DefaultSingletonTraits<XMenuList>;
  38   XMenuList();
  39   ~XMenuList();
  40
  41   std::vector<XID> menus_;
  42   ::Atom menu_type_atom_;
  43   DISALLOW_COPY_AND_ASSIGN(XMenuList);
  44 };
  45
  46 }  // namespace ui
  47
  48 #endif  // UI_BASE_X_X11_MENU_LIST_H_