ui/gfx/display_observer.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_GFX_DISPLAY_OBSERVER_H_
   6 #define UI_GFX_DISPLAY_OBSERVER_H_
   7
   8 #include "ui/gfx/gfx_export.h"
   9
  10 namespace gfx {
  11 class Display;
  12
  13 // Observers for display configuration changes.
  14 // TODO(oshima): consolidate |WorkAreaWatcherObserver| and
  15 // |DisplaySettingsProvier|. crbug.com/122863.
  16 class GFX_EXPORT DisplayObserver {
  17  public:
  18   // Called when the |display|'s bound has changed.
  19   virtual void OnDisplayBoundsChanged(const Display& display) = 0;
  20
  21   // Called when |new_display| has been added.
  22   virtual void OnDisplayAdded(const Display& new_display) = 0;
  23
  24   // Called when |old_display| has been removed.
  25   virtual void OnDisplayRemoved(const Display& old_display) = 0;
  26
  27  protected:
  28   virtual ~DisplayObserver();
  29 };
  30
  31 }  // namespace gfx
  32
  33 #endif  // UI_GFX_DISPLAY_OBSERVER_H_