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
12namespace gfx {
13class Display;
14
15// Observers for display configuration changes.
16// TODO(oshima): consolidate |WorkAreaWatcherObserver| and
17// |DisplaySettingsProvier|. crbug.com/122863.
18class 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