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Side by Side Diff: ui/gfx/display_change_notifier.cc

Issue 1964153002: Move Screen, its impls, DisplayObserver and DisplayChangeNotifier to ui/display (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 7 months ago
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1 // Copyright 2014 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 #include "ui/gfx/display_change_notifier.h"
6
7 #include <stdint.h>
8
9 #include "ui/gfx/display.h"
10 #include "ui/gfx/display_observer.h"
11
12 namespace gfx {
13
14 namespace {
15
16 class DisplayComparator {
17 public:
18 explicit DisplayComparator(const Display& display)
19 : display_id_(display.id())
20 {}
21
22 bool operator()(const Display& display) const {
23 return display.id() == display_id_;
24 }
25
26 private:
27 int64_t display_id_;
28 };
29
30 } // anonymous namespace
31
32 DisplayChangeNotifier::DisplayChangeNotifier() {
33 }
34
35 DisplayChangeNotifier::~DisplayChangeNotifier() {
36 }
37
38 void DisplayChangeNotifier::AddObserver(DisplayObserver* obs) {
39 observer_list_.AddObserver(obs);
40 }
41
42 void DisplayChangeNotifier::RemoveObserver(DisplayObserver* obs) {
43 observer_list_.RemoveObserver(obs);
44 }
45
46 void DisplayChangeNotifier::NotifyDisplaysChanged(
47 const std::vector<Display>& old_displays,
48 const std::vector<Display>& new_displays) {
49 // Display present in old_displays but not in new_displays has been removed.
50 std::vector<Display>::const_iterator old_it = old_displays.begin();
51 for (; old_it != old_displays.end(); ++old_it) {
52 if (std::find_if(new_displays.begin(), new_displays.end(),
53 DisplayComparator(*old_it)) == new_displays.end()) {
54 FOR_EACH_OBSERVER(DisplayObserver, observer_list_,
55 OnDisplayRemoved(*old_it));
56 }
57 }
58
59 // Display present in new_displays but not in old_displays has been added.
60 // Display present in both might have been modified.
61 for (std::vector<Display>::const_iterator new_it =
62 new_displays.begin(); new_it != new_displays.end(); ++new_it) {
63 std::vector<Display>::const_iterator old_it = std::find_if(
64 old_displays.begin(), old_displays.end(), DisplayComparator(*new_it));
65
66 if (old_it == old_displays.end()) {
67 FOR_EACH_OBSERVER(DisplayObserver, observer_list_,
68 OnDisplayAdded(*new_it));
69 continue;
70 }
71
72 uint32_t metrics = DisplayObserver::DISPLAY_METRIC_NONE;
73
74 if (new_it->bounds() != old_it->bounds())
75 metrics |= DisplayObserver::DISPLAY_METRIC_BOUNDS;
76
77 if (new_it->rotation() != old_it->rotation())
78 metrics |= DisplayObserver::DISPLAY_METRIC_ROTATION;
79
80 if (new_it->work_area() != old_it->work_area())
81 metrics |= DisplayObserver::DISPLAY_METRIC_WORK_AREA;
82
83 if (new_it->device_scale_factor() != old_it->device_scale_factor())
84 metrics |= DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
85
86 if (metrics != DisplayObserver::DISPLAY_METRIC_NONE) {
87 FOR_EACH_OBSERVER(DisplayObserver,
88 observer_list_,
89 OnDisplayMetricsChanged(*new_it, metrics));
90 }
91 }
92 }
93
94 } // namespace gfx
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