1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_DISPLAY_DISPLAY_OBSERVER_H_
#define UI_DISPLAY_DISPLAY_OBSERVER_H_
#include <stdint.h>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "base/observer_list_types.h"
#include "build/buildflag.h"
#include "ui/display/display_export.h"
namespace display {
class Display;
enum class TabletState;
using Displays = std::vector<Display>;
// Observers for display configuration changes.
class DISPLAY_EXPORT DisplayObserver : public base::CheckedObserver {
public:
enum DisplayMetric {
DISPLAY_METRIC_NONE = 0,
DISPLAY_METRIC_BOUNDS = 1 << 0,
DISPLAY_METRIC_WORK_AREA = 1 << 1,
DISPLAY_METRIC_DEVICE_SCALE_FACTOR = 1 << 2,
DISPLAY_METRIC_ROTATION = 1 << 3,
DISPLAY_METRIC_PRIMARY = 1 << 4,
DISPLAY_METRIC_MIRROR_STATE = 1 << 5,
DISPLAY_METRIC_COLOR_SPACE = 1 << 6,
DISPLAY_METRIC_REFRESH_RATE = 1 << 7,
DISPLAY_METRIC_INTERLACED = 1 << 8,
DISPLAY_METRIC_LABEL = 1 << 9,
DISPLAY_METRIC_VRR = 1 << 10,
DISPLAY_METRIC_DETECTED = 1 << 11,
};
// Called when |new_display| has been added.
virtual void OnDisplayAdded(const Display& new_display) {}
// Called before displays have been removed.
virtual void OnWillRemoveDisplays(const Displays& removed_displays) {}
// Called *after* `removed_displays` have been removed. Not called per
// display.
virtual void OnDisplaysRemoved(const Displays& removed_displays) {}
// Called when the metrics of a display change.
// |changed_metrics| is a bitmask of DisplayMetric types indicating which
// metrics have changed. Eg; if mirroring changes (either from true to false,
// or false to true), than the DISPLAY_METRIC_MIRROR_STATE bit is set in
// changed_metrics.
virtual void OnDisplayMetricsChanged(const Display& display,
uint32_t changed_metrics) {}
// Called when the (platform-specific) workspace ID changes to
// |new_workspace|.
virtual void OnCurrentWorkspaceChanged(const std::string& new_workspace) {}
// Called when display changes between conventional and tablet mode.
virtual void OnDisplayTabletStateChanged(TabletState state) {}
#if BUILDFLAG(IS_MAC)
// Called when the primary display that contains the (0,0) origin changed.
virtual void OnPrimaryDisplayChanged() {}
#endif
protected:
~DisplayObserver() override;
};
// Caller must ensure the lifetime of `observer` outlives ScopedDisplayObserver
// and ScopedOptionalDisplayObserver. The "Optional" version does not care
// whether there is a display::Screen::GetScreen() to observe or not and will
// silently noop when there is not. The non-optional ScopedDisplayObserver
// will CHECK that display::Screen::GetScreen() exists on construction to
// receive events from.
class DISPLAY_EXPORT ScopedOptionalDisplayObserver {
public:
explicit ScopedOptionalDisplayObserver(DisplayObserver* observer);
~ScopedOptionalDisplayObserver();
private:
raw_ptr<DisplayObserver> observer_ = nullptr;
};
class DISPLAY_EXPORT ScopedDisplayObserver
: public ScopedOptionalDisplayObserver {
public:
explicit ScopedDisplayObserver(DisplayObserver* observer);
};
} // namespace display
#endif // UI_DISPLAY_DISPLAY_OBSERVER_H_
|
