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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/mouse_watcher.h"
#include <utility>
#include "base/compiler_specific.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "ui/events/event.h"
#include "ui/events/event_observer.h"
#include "ui/events/event_utils.h"
#include "ui/events/platform_event.h"
#include "ui/events/types/event_type.h"
#include "ui/views/event_monitor.h"
namespace views {
// Amount of time between when the mouse moves outside the Host's zone and when
// the listener is notified.
constexpr auto kNotifyListenerTime = base::Milliseconds(300);
class MouseWatcher::Observer : public ui::EventObserver {
public:
Observer(MouseWatcher* mouse_watcher, gfx::NativeWindow window)
: mouse_watcher_(mouse_watcher) {
event_monitor_ = EventMonitor::CreateApplicationMonitor(
this, window,
{ui::EventType::kMousePressed, ui::EventType::kMouseMoved,
ui::EventType::kMouseExited, ui::EventType::kMouseDragged});
}
Observer(const Observer&) = delete;
Observer& operator=(const Observer&) = delete;
// ui::EventObserver:
void OnEvent(const ui::Event& event) override {
using EventType = MouseWatcherHost::EventType;
switch (event.type()) {
case ui::EventType::kMouseMoved:
case ui::EventType::kMouseDragged:
HandleMouseEvent(EventType::kMove);
break;
case ui::EventType::kMouseExited:
HandleMouseEvent(EventType::kExit);
break;
case ui::EventType::kMousePressed:
HandleMouseEvent(EventType::kPress);
break;
default:
NOTREACHED();
}
}
private:
MouseWatcherHost* host() const { return mouse_watcher_->host_.get(); }
// Called when a mouse event we're interested is seen.
void HandleMouseEvent(MouseWatcherHost::EventType event_type) {
using EventType = MouseWatcherHost::EventType;
// It's safe to use GetLastMouseLocation() here as this function is invoked
// during event dispatching.
if (!host()->Contains(event_monitor_->GetLastMouseLocation(), event_type)) {
if (event_type == EventType::kPress) {
NotifyListener();
} else if (!notify_listener_factory_.HasWeakPtrs()) {
// Mouse moved outside the host's zone, start a timer to notify the
// listener.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&Observer::NotifyListener,
notify_listener_factory_.GetWeakPtr()),
event_type == EventType::kMove
? kNotifyListenerTime
: mouse_watcher_->notify_on_exit_time_);
}
} else {
// Mouse moved quickly out of the host and then into it again, so cancel
// the timer.
notify_listener_factory_.InvalidateWeakPtrs();
}
}
void NotifyListener() {
mouse_watcher_->NotifyListener();
// WARNING: we've been deleted.
}
private:
raw_ptr<MouseWatcher> mouse_watcher_;
std::unique_ptr<views::EventMonitor> event_monitor_;
// A factory that is used to construct a delayed callback to the listener.
base::WeakPtrFactory<Observer> notify_listener_factory_{this};
};
MouseWatcherListener::~MouseWatcherListener() = default;
MouseWatcherHost::~MouseWatcherHost() = default;
MouseWatcher::MouseWatcher(std::unique_ptr<MouseWatcherHost> host,
MouseWatcherListener* listener)
: host_(std::move(host)),
listener_(listener),
notify_on_exit_time_(kNotifyListenerTime) {}
MouseWatcher::~MouseWatcher() = default;
void MouseWatcher::Start(gfx::NativeWindow window) {
if (!is_observing()) {
observer_ = std::make_unique<Observer>(this, window);
}
}
void MouseWatcher::Stop() {
observer_.reset();
}
void MouseWatcher::NotifyListener() {
observer_.reset();
listener_->MouseMovedOutOfHost();
}
} // namespace views
|
