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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
content / browser / media / capture / mouse_cursor_overlay_controller_mac.mm [blame]
// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/media/capture/mouse_cursor_overlay_controller.h"
#include <Cocoa/Cocoa.h>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/mac/mac_util.h"
#include "base/memory/raw_ptr.h"
#include "skia/ext/skia_utils_mac.h"
#include "ui/base/cocoa/tracking_area.h"
namespace {
using LocationUpdateCallback = base::RepeatingCallback<void(const NSPoint&)>;
} // namespace;
// Uses a CrTrackingArea to monitor for mouse events and forwards them to the
// MouseCursorOverlayController::Observer.
@interface MouseCursorOverlayTracker : NSObject
- (instancetype)initWithCallback:(LocationUpdateCallback)callback
andView:(NSView*)nsView;
- (void)stopTracking:(NSView*)nsView;
@end
@implementation MouseCursorOverlayTracker {
LocationUpdateCallback _callback;
ui::ScopedCrTrackingArea _trackingArea;
id __strong _monitorId;
}
- (instancetype)initWithCallback:(LocationUpdateCallback)callback
andView:(NSView*)nsView {
if ((self = [super init])) {
_callback = std::move(callback);
constexpr NSTrackingAreaOptions kTrackingOptions =
NSTrackingMouseMoved | NSTrackingMouseEnteredAndExited |
NSTrackingActiveInKeyWindow | NSTrackingInVisibleRect |
NSTrackingEnabledDuringMouseDrag;
CrTrackingArea* trackingArea =
[[CrTrackingArea alloc] initWithRect:NSZeroRect
options:kTrackingOptions
owner:self
userInfo:nil];
_trackingArea.reset(trackingArea);
[nsView addTrackingArea:trackingArea];
NSEvent* (^mouseDragged)(NSEvent*) = ^NSEvent*(NSEvent* event) {
self->_callback.Run([event locationInWindow]);
return event;
};
const NSEventMask drag_mask = NSEventMaskLeftMouseDragged |
NSEventMaskRightMouseDragged |
NSEventMaskOtherMouseDragged;
_monitorId = [NSEvent addLocalMonitorForEventsMatchingMask:drag_mask
handler:mouseDragged];
}
return self;
}
- (void)stopTracking:(NSView*)nsView {
// Tracking is managed by the lifetime of ::Observer which is reset each time
// a target view is set through the public API of the overlay controller. This
// method should only be called after initWithCallback(), and only once per
// initWithCallback() call.
CHECK(_trackingArea.get());
CHECK(_callback);
[NSEvent removeMonitor:_monitorId];
[nsView removeTrackingArea:_trackingArea.get()];
_trackingArea.reset();
_callback.Reset();
}
- (void)mouseMoved:(NSEvent*)theEvent {
_callback.Run([theEvent locationInWindow]);
}
- (void)mouseEntered:(NSEvent*)theEvent {
_callback.Run([theEvent locationInWindow]);
}
- (void)mouseExited:(NSEvent*)theEvent {
_callback.Run([theEvent locationInWindow]);
}
@end
namespace content {
class MouseCursorOverlayController::Observer {
public:
explicit Observer(MouseCursorOverlayController* controller, NSView* view)
: controller_(controller), view_(view) {
DCHECK(controller_);
DCHECK(view_);
controller_->OnMouseHasGoneIdle();
mouse_tracker_ = [[MouseCursorOverlayTracker alloc]
initWithCallback:base::BindRepeating(&Observer::OnMouseMoved,
base::Unretained(this))
andView:view_];
}
Observer(const Observer&) = delete;
Observer& operator=(const Observer&) = delete;
~Observer() { StopTracking(); }
void StopTracking() {
if (mouse_tracker_) {
[mouse_tracker_ stopTracking:view_];
mouse_tracker_ = nil;
controller_->OnMouseHasGoneIdle();
}
}
static NSView* GetTargetView(const std::unique_ptr<Observer>& observer) {
if (observer) {
return observer->view_;
}
return nil;
}
private:
void OnMouseMoved(const NSPoint& location_in_window) {
const bool cursor_within_surface =
NSPointInRect(location_in_window, NSRectFromCGRect([view_ bounds]));
// Compute the location within the view using Aura conventions: (0,0) is the
// upper-left corner. So, if the NSView is flipped in Cocoa, it's not
// flipped in Aura.
NSPoint location_aura =
[view_ convertPoint:location_in_window fromView:nil];
if (![view_ isFlipped]) {
location_aura.y = NSHeight([view_ bounds]) - location_aura.y;
}
controller_->OnMouseMoved(gfx::PointF(location_aura.x, location_aura.y));
if (controller_->ShouldSendMouseEvents()) {
controller_->OnMouseCoordinatesUpdated(
cursor_within_surface ? gfx::Point(std::round(location_aura.x),
std::round(location_aura.y))
: kOutsideSurface);
}
}
const raw_ptr<MouseCursorOverlayController> controller_;
NSView* __strong view_;
MouseCursorOverlayTracker* __strong mouse_tracker_;
};
MouseCursorOverlayController::MouseCursorOverlayController()
// base::Unretained(this) is safe because we own mouse_activity_ended_timer_
// and its destructor calls TimerBase::AbandonScheduledTask().
: mouse_activity_ended_timer_(
FROM_HERE,
kIdleTimeout,
base::BindRepeating(&MouseCursorOverlayController::OnMouseHasGoneIdle,
base::Unretained(this))),
mouse_move_behavior_atomic_(kNotMoving) {
// MouseCursorOverlayController can be constructed on any thread, but
// thereafter must be used according to class-level comments.
DETACH_FROM_SEQUENCE(ui_sequence_checker_);
}
MouseCursorOverlayController::~MouseCursorOverlayController() {
DCHECK_CALLED_ON_VALID_SEQUENCE(ui_sequence_checker_);
observer_.reset();
Stop();
}
void MouseCursorOverlayController::SetTargetView(gfx::NativeView view) {
DCHECK_CALLED_ON_VALID_SEQUENCE(ui_sequence_checker_);
observer_.reset();
if (view) {
observer_ = std::make_unique<Observer>(this, view.GetNativeNSView());
}
}
gfx::NativeCursor MouseCursorOverlayController::GetCurrentCursorOrDefault()
const {
DCHECK_CALLED_ON_VALID_SEQUENCE(ui_sequence_checker_);
NSCursor* cursor = NSCursor.currentCursor;
if (!cursor) {
cursor = NSCursor.arrowCursor;
}
return base::apple::OwnedNSCursor(cursor);
}
gfx::RectF MouseCursorOverlayController::ComputeRelativeBoundsForOverlay(
const gfx::NativeCursor& cursor,
const gfx::PointF& location_aura) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(ui_sequence_checker_);
gfx::Size target_size;
if (NSView* view = Observer::GetTargetView(observer_)) {
const NSRect view_bounds = [view bounds];
target_size = gfx::Size(NSWidth(view_bounds), NSHeight(view_bounds));
} else {
// The target for capture can be a views::Widget, which is an NSWindow,
// not a NSView. This path is used in that case.
target_size = target_size_;
}
if (target_size.GetArea()) {
NSCursor* ns_cursor = cursor.Get();
// The documentation on NSCursor reference states that the hot spot is in
// flipped coordinates which, from the perspective of the Aura coordinate
// system, means it's not flipped.
const NSPoint hotspot = ns_cursor.hotSpot;
const NSSize size = ns_cursor.image.size;
return gfx::ScaleRect(
gfx::RectF(location_aura.x() - hotspot.x, location_aura.y() - hotspot.y,
size.width, size.height),
1.0 / target_size.width(), 1.0 / target_size.height());
}
return gfx::RectF();
}
void MouseCursorOverlayController::DisconnectFromToolkitForTesting() {
DCHECK_CALLED_ON_VALID_SEQUENCE(ui_sequence_checker_);
observer_->StopTracking();
// Note: Not overriding the mouse cursor since the default is already
// [NSCursor arrowCursor], which provides the tests a bitmap they can work
// with.
}
// static
SkBitmap MouseCursorOverlayController::GetCursorImage(
const gfx::NativeCursor& cursor) {
return skia::NSImageToSkBitmap(cursor.Get().image, /*is_opaque=*/false);
}
} // namespace content