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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