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 <stdint.h>
   9
  10 #include "ui/gfx/gfx_export.h"
  11
  12 namespace gfx {
  13 class Display;
  14
  15 // Observers for display configuration changes.
  16 // TODO(oshima): consolidate |WorkAreaWatcherObserver| and
  17 // |DisplaySettingsProvier|. crbug.com/122863.
  18 class GFX_EXPORT DisplayObserver {
  19  public:
  20   enum DisplayMetric {
  21     DISPLAY_METRIC_NONE = 0,
  22     DISPLAY_METRIC_BOUNDS = 1 << 0,
  23     DISPLAY_METRIC_WORK_AREA = 1 << 1,
  24     DISPLAY_METRIC_DEVICE_SCALE_FACTOR = 1 << 2,
  25     DISPLAY_METRIC_ROTATION = 1 << 3,
  26   };
  27
  28   // Called when |new_display| has been added.
  29   virtual void OnDisplayAdded(const Display& new_display) = 0;
  30
  31   // Called when |old_display| has been removed.
  32   virtual void OnDisplayRemoved(const Display& old_display) = 0;
  33
  34   // Called when a |display| has one or more metrics changed. |changed_metrics|
  35   // will contain the information about the change, see |DisplayMetric|.
  36   virtual void OnDisplayMetricsChanged(const Display& display,
  37                                        uint32_t changed_metrics) = 0;
  38
  39  protected:
  40   virtual ~DisplayObserver();
  41 };
  42
  43 }  // namespace gfx
  44
  45 #endif  // UI_GFX_DISPLAY_OBSERVER_H_