ui/gfx/display_change_notifier.h

   1 // Copyright 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_GFX_DISPLAY_CHANGE_NOTIFIER_H_
   6 #define UI_GFX_DISPLAY_CHANGE_NOTIFIER_H_
   7
   8 #include <vector>
   9
  10 #include "base/observer_list.h"
  11 #include "ui/gfx/gfx_export.h"
  12
  13 namespace gfx {
  14
  15 class Display;
  16 class DisplayObserver;
  17
  18 // DisplayChangeNotifier is a class implementing the handling of DisplayObserver
  19 // notification for Screen.
  20 class GFX_EXPORT DisplayChangeNotifier {
  21  public:
  22   DisplayChangeNotifier();
  23   ~DisplayChangeNotifier();
  24
  25   void AddObserver(DisplayObserver* observer);
  26
  27   void RemoveObserver(DisplayObserver* observer);
  28
  29   void NotifyDisplaysChanged(const std::vector<Display>& old_displays,
  30                              const std::vector<Display>& new_displays);
  31
  32  private:
  33   // The observers that need to be notified when a display is modified, added
  34   // or removed.
  35   ObserverList<DisplayObserver> observer_list_;
  36
  37   DISALLOW_COPY_AND_ASSIGN(DisplayChangeNotifier);
  38 };
  39
  40 } // namespace gfx
  41
  42 #endif // UI_GFX_DISPLAY_CHANGE_NOTIFIER_H_
  43