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      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_
     46