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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
content / browser / renderer_host / render_widget_host_view_event_handler.cc [blame]
// Copyright 2016 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/renderer_host/render_widget_host_view_event_handler.h"
#include "base/command_line.h"
#include "base/metrics/user_metrics.h"
#include "base/metrics/user_metrics_action.h"
#include "base/numerics/safe_conversions.h"
#include "build/build_config.h"
#include "components/input/render_widget_host_input_event_router.h"
#include "components/input/switches.h"
#include "components/viz/common/features.h"
#include "content/browser/renderer_host/input/touch_selection_controller_client_aura.h"
#include "content/browser/renderer_host/overscroll_controller.h"
#include "content/browser/renderer_host/render_view_host_delegate.h"
#include "content/browser/renderer_host/render_view_host_delegate_view.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_view_base.h"
#include "content/browser/renderer_host/text_input_manager.h"
#include "content/common/features.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/render_widget_host.h"
#include "ui/aura/client/cursor_client.h"
#include "ui/aura/client/focus_client.h"
#include "ui/aura/scoped_keyboard_hook.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura/window_tree_host.h"
#include "ui/base/ime/text_input_client.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/layer.h"
#include "ui/events/blink/blink_event_util.h"
#include "ui/events/blink/web_input_event.h"
#include "ui/events/keycodes/dom/dom_code.h"
#include "ui/gfx/delegated_ink_point.h"
#include "ui/touch_selection/touch_selection_controller.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#endif
namespace {
// In mouse lock mode, we need to prevent the (invisible) cursor from hitting
// the border of the view, in order to get valid movement information. However,
// forcing the cursor back to the center of the view after each mouse move
// doesn't work well. It reduces the frequency of useful mouse move messages
// significantly. Therefore, we move the cursor to the center of the view only
// if it approaches the border. |kMouseLockBorderPercentage| specifies the width
// of the border area, in percentage of the corresponding dimension.
const int kMouseLockBorderPercentage = 15;
#if BUILDFLAG(IS_WIN)
// A callback function for EnumThreadWindows to enumerate and dismiss
// any owned popup windows.
BOOL CALLBACK DismissOwnedPopups(HWND window, LPARAM arg) {
const HWND toplevel_hwnd = reinterpret_cast<HWND>(arg);
if (::IsWindowVisible(window)) {
const HWND owner = ::GetWindow(window, GW_OWNER);
if (toplevel_hwnd == owner) {
::PostMessageW(window, WM_CANCELMODE, 0, 0);
}
}
return TRUE;
}
#endif // BUILDFLAG(IS_WIN)
bool IsFractionalScaleFactor(float scale_factor) {
return (scale_factor - static_cast<int>(scale_factor)) > 0;
}
// We don't mark these as handled so that they're sent back to the
// DefWindowProc so it can generate WM_APPCOMMAND as necessary.
bool ShouldGenerateAppCommand(const ui::MouseEvent* event) {
#if BUILDFLAG(IS_WIN)
return (event->native_event().message == WM_NCXBUTTONUP);
#else
return false;
#endif
}
// Reset unchanged touch points to StateStationary for touchmove and
// touchcancel.
void MarkUnchangedTouchPointsAsStationary(blink::WebTouchEvent* event,
int changed_touch_id) {
if (event->GetType() == blink::WebInputEvent::Type::kTouchMove ||
event->GetType() == blink::WebInputEvent::Type::kTouchCancel) {
for (size_t i = 0; i < event->touches_length; ++i) {
if (event->touches[i].id != changed_touch_id)
event->touches[i].state = blink::WebTouchPoint::State::kStateStationary;
}
}
}
bool NeedsInputGrab(content::RenderWidgetHostViewBase* view) {
if (!view)
return false;
return view->GetWidgetType() == content::WidgetType::kPopup;
}
} // namespace
namespace content {
RenderWidgetHostViewEventHandler::Delegate::Delegate() = default;
RenderWidgetHostViewEventHandler::Delegate::~Delegate() {}
RenderWidgetHostViewEventHandler::RenderWidgetHostViewEventHandler(
RenderWidgetHostImpl* host,
RenderWidgetHostViewBase* host_view,
Delegate* delegate)
: pinch_zoom_enabled_(input::switches::IsPinchToZoomEnabled()),
host_(host),
host_view_(host_view),
delegate_(delegate),
mouse_wheel_phase_handler_(host_view) {}
RenderWidgetHostViewEventHandler::~RenderWidgetHostViewEventHandler() {
DCHECK(!mouse_locked_);
}
void RenderWidgetHostViewEventHandler::SetPopupChild(
RenderWidgetHostViewBase* popup_child_host_view,
ui::EventHandler* popup_child_event_handler) {
popup_child_host_view_ = popup_child_host_view;
popup_child_event_handler_ = popup_child_event_handler;
}
blink::mojom::PointerLockResult RenderWidgetHostViewEventHandler::LockPointer(
bool request_unadjusted_movement) {
aura::Window* root_window = window_->GetRootWindow();
if (!root_window)
return blink::mojom::PointerLockResult::kWrongDocument;
if (mouse_locked_)
return blink::mojom::PointerLockResult::kSuccess;
if (request_unadjusted_movement && window_->GetHost()) {
mouse_locked_unadjusted_movement_ =
window_->GetHost()->RequestUnadjustedMovement();
if (!mouse_locked_unadjusted_movement_)
return blink::mojom::PointerLockResult::kUnsupportedOptions;
}
mouse_locked_ = true;
window_->GetHost()->LockMouse(window_);
if (ShouldMoveToCenter(unlocked_global_mouse_position_))
MoveCursorToCenter(nullptr);
delegate_->SetTooltipsEnabled(false);
return blink::mojom::PointerLockResult::kSuccess;
}
blink::mojom::PointerLockResult
RenderWidgetHostViewEventHandler::ChangePointerLock(
bool request_unadjusted_movement) {
aura::Window* root_window = window_->GetRootWindow();
if (!root_window || !window_->GetHost())
return blink::mojom::PointerLockResult::kWrongDocument;
// If lock was lost before completing this change request
// it was because the user hit escape or navigated away
// from the page.
if (!mouse_locked_)
return blink::mojom::PointerLockResult::kUserRejected;
if (!request_unadjusted_movement) {
mouse_locked_unadjusted_movement_.reset();
return blink::mojom::PointerLockResult::kSuccess;
}
if (mouse_locked_unadjusted_movement_) {
// Desired state already acquired.
return blink::mojom::PointerLockResult::kSuccess;
}
mouse_locked_unadjusted_movement_ =
window_->GetHost()->RequestUnadjustedMovement();
if (!mouse_locked_unadjusted_movement_)
return blink::mojom::PointerLockResult::kUnsupportedOptions;
return blink::mojom::PointerLockResult::kSuccess;
}
void RenderWidgetHostViewEventHandler::UnlockPointer() {
delegate_->SetTooltipsEnabled(true);
aura::Window* root_window = window_->GetRootWindow();
if (!mouse_locked_ || !root_window)
return;
mouse_locked_ = false;
mouse_locked_unadjusted_movement_.reset();
window_->GetHost()->UnlockMouse(window_);
// Ensure that the global mouse position is updated here to its original
// value. If we don't do this then the synthesized mouse move which is posted
// after the cursor is moved ends up getting a large movement delta which is
// not what sites expect. The delta is computed in the
// ModifyEventMovementAndCoords function.
window_->MoveCursorTo(gfx::ToFlooredPoint(unlocked_mouse_position_));
synthetic_move_position_ =
gfx::ToFlooredPoint(unlocked_global_mouse_position_);
host_->LostPointerLock();
}
bool RenderWidgetHostViewEventHandler::LockKeyboard(
std::optional<base::flat_set<ui::DomCode>> codes) {
aura::Window* root_window = window_->GetRootWindow();
if (!root_window)
return false;
// Remove existing hook, if registered.
UnlockKeyboard();
scoped_keyboard_hook_ = root_window->CaptureSystemKeyEvents(std::move(codes));
return IsKeyboardLocked();
}
void RenderWidgetHostViewEventHandler::UnlockKeyboard() {
scoped_keyboard_hook_.reset();
}
bool RenderWidgetHostViewEventHandler::IsKeyboardLocked() const {
return scoped_keyboard_hook_ != nullptr;
}
void RenderWidgetHostViewEventHandler::OnKeyEvent(ui::KeyEvent* event) {
TRACE_EVENT0("input", "RenderWidgetHostViewBase::OnKeyEvent");
if (NeedsInputGrab(popup_child_host_view_)) {
popup_child_event_handler_->OnKeyEvent(event);
if (event->handled())
return;
}
if (event->key_code() == ui::VKEY_RETURN) {
// Do not forward return key release events if no press event was handled.
if (event->type() == ui::EventType::kKeyReleased &&
!accept_return_character_) {
return;
}
// Accept return key character events between press and release events.
accept_return_character_ = event->type() == ui::EventType::kKeyPressed;
}
// Call SetKeyboardFocus() for not only EventType::kKeyPressed but also
// EventType::kKeyReleased. If a user closed the hotdog menu with ESC key
// press, we need to notify focus to Blink on EventType::kKeyReleased for ESC
// key.
SetKeyboardFocus();
// We don't have to communicate with an input method here.
input::NativeWebKeyboardEvent webkit_event(*event);
// If the key has been reserved as part of the active KeyboardLock request,
// then we want to mark it as such so it is not intercepted by the browser.
if (IsKeyLocked(*event))
webkit_event.skip_if_unhandled = true;
bool mark_event_as_handled = true;
delegate_->ForwardKeyboardEventWithLatencyInfo(
webkit_event, *event->latency(), &mark_event_as_handled);
if (mark_event_as_handled)
event->SetHandled();
}
void RenderWidgetHostViewEventHandler::HandleMouseWheelEvent(
ui::MouseEvent* event) {
DCHECK(event);
DCHECK_EQ(event->type(), ui::EventType::kMousewheel);
#if BUILDFLAG(IS_WIN)
if (!mouse_locked_) {
// We get mouse wheel/scroll messages even if we are not in the foreground.
// So here we check if we have any owned popup windows in the foreground and
// dismiss them.
aura::WindowTreeHost* host = window_->GetHost();
if (host) {
HWND parent = host->GetAcceleratedWidget();
HWND toplevel_hwnd = ::GetAncestor(parent, GA_ROOT);
EnumThreadWindows(GetCurrentThreadId(), DismissOwnedPopups,
reinterpret_cast<LPARAM>(toplevel_hwnd));
}
}
#endif
blink::WebMouseWheelEvent mouse_wheel_event =
ui::MakeWebMouseWheelEvent(*event->AsMouseWheelEvent());
if (mouse_wheel_event.delta_x != 0 || mouse_wheel_event.delta_y != 0) {
const bool should_route_event = ShouldRouteEvents();
// End the touchpad scrolling sequence (if such exists) before handling
// a ui::EventType::kMousewheel event.
mouse_wheel_phase_handler_.SendWheelEndForTouchpadScrollingIfNeeded(
should_route_event);
mouse_wheel_phase_handler_.AddPhaseIfNeededAndScheduleEndEvent(
mouse_wheel_event, should_route_event);
if (should_route_event) {
host_->delegate()->GetInputEventRouter()->RouteMouseWheelEvent(
host_view_, &mouse_wheel_event, *event->latency());
} else {
ProcessMouseWheelEvent(mouse_wheel_event, *event->latency());
}
}
}
void RenderWidgetHostViewEventHandler::OnMouseEvent(ui::MouseEvent* event) {
TRACE_EVENT0("input", "RenderWidgetHostViewBase::OnMouseEvent");
// CrOS will send a mouse exit event to update hover state when mouse is
// hidden which we want to filter out in renderer. crbug.com/723535.
if (event->flags() & ui::EF_CURSOR_HIDE)
return;
ForwardMouseEventToParent(event);
// TODO(mgiuca): Return if event->handled() returns true. This currently
// breaks drop-down lists which means something is incorrectly setting
// event->handled to true (http://crbug.com/577983).
if (mouse_locked_) {
HandleMouseEventWhileLocked(event);
return;
}
// As the overscroll is handled during scroll events from the trackpad, the
// RWHVA window is transformed by the overscroll controller. This transform
// triggers a synthetic mouse-move event to be generated (by the aura
// RootWindow). Also, with a touchscreen, we may get a synthetic mouse-move
// caused by a pointer grab. But these events interfere with the overscroll
// gesture. So, ignore such synthetic mouse-move events if an overscroll
// gesture is in progress.
OverscrollController* overscroll_controller =
delegate_->overscroll_controller();
if (overscroll_controller &&
overscroll_controller->overscroll_mode() != OVERSCROLL_NONE &&
event->flags() & ui::EF_IS_SYNTHESIZED &&
(event->type() == ui::EventType::kMouseEntered ||
event->type() == ui::EventType::kMouseExited ||
event->type() == ui::EventType::kMouseMoved)) {
event->StopPropagation();
return;
}
if (event->type() == ui::EventType::kMousewheel) {
HandleMouseWheelEvent(event);
} else {
bool is_selection_popup = NeedsInputGrab(popup_child_host_view_);
if (CanRendererHandleEvent(event, mouse_locked_, is_selection_popup) &&
!(event->flags() & ui::EF_FROM_TOUCH)) {
// Confirm existing composition text on mouse press, to make sure
// the input caret won't be moved with an ongoing composition text.
if (event->type() == ui::EventType::kMousePressed) {
FinishImeCompositionSession();
}
blink::WebMouseEvent mouse_event = ui::MakeWebMouseEvent(*event);
ModifyEventMovementAndCoords(*event, &mouse_event);
if (ShouldRouteEvents()) {
host_->delegate()->GetInputEventRouter()->RouteMouseEvent(
host_view_, &mouse_event, *event->latency());
} else {
ProcessMouseEvent(mouse_event, *event->latency());
}
// Ensure that we get keyboard focus on mouse down as a plugin window may
// have grabbed keyboard focus.
if (event->type() == ui::EventType::kMousePressed) {
SetKeyboardFocus();
}
}
}
switch (event->type()) {
case ui::EventType::kMousePressed:
window_->SetCapture();
break;
case ui::EventType::kMouseReleased:
if (!delegate_->NeedsMouseCapture())
window_->ReleaseCapture();
break;
default:
break;
}
if (!ShouldGenerateAppCommand(event))
event->SetHandled();
}
void RenderWidgetHostViewEventHandler::OnScrollEvent(ui::ScrollEvent* event) {
TRACE_EVENT0("input", "RenderWidgetHostViewBase::OnScrollEvent");
const bool should_route_event = ShouldRouteEvents();
if (event->type() == ui::EventType::kScroll) {
#if !BUILDFLAG(IS_WIN)
// TODO(ananta)
// Investigate if this is true for Windows 8 Metro ASH as well.
if (event->finger_count() != 2)
return;
#endif
blink::WebMouseWheelEvent mouse_wheel_event =
ui::MakeWebMouseWheelEvent(*event);
mouse_wheel_phase_handler_.AddPhaseIfNeededAndScheduleEndEvent(
mouse_wheel_event, should_route_event);
std::optional<blink::WebGestureEvent> maybe_synthetic_fling_cancel;
if (mouse_wheel_event.phase == blink::WebMouseWheelEvent::kPhaseBegan) {
maybe_synthetic_fling_cancel =
ui::MakeWebGestureEventFlingCancel(mouse_wheel_event);
}
if (should_route_event) {
if (maybe_synthetic_fling_cancel) {
host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
host_view_, &*maybe_synthetic_fling_cancel, ui::LatencyInfo());
}
host_->delegate()->GetInputEventRouter()->RouteMouseWheelEvent(
host_view_, &mouse_wheel_event, *event->latency());
} else {
if (maybe_synthetic_fling_cancel) {
host_->ForwardGestureEvent(*maybe_synthetic_fling_cancel);
}
host_->ForwardWheelEventWithLatencyInfo(mouse_wheel_event,
*event->latency());
}
} else if (event->type() == ui::EventType::kScrollFlingStart ||
event->type() == ui::EventType::kScrollFlingCancel) {
blink::WebGestureEvent gesture_event = ui::MakeWebGestureEvent(*event);
if (should_route_event) {
host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
host_view_, &gesture_event, ui::LatencyInfo());
} else {
host_->ForwardGestureEvent(gesture_event);
}
if (event->type() == ui::EventType::kScrollFlingStart) {
RecordAction(base::UserMetricsAction("TrackpadScrollFling"));
// The user has lifted their fingers.
mouse_wheel_phase_handler_.ResetTouchpadScrollSequence();
} else if (event->type() == ui::EventType::kScrollFlingCancel) {
// The user has put their fingers down.
DCHECK_EQ(blink::WebGestureDevice::kTouchpad,
gesture_event.SourceDevice());
mouse_wheel_phase_handler_.TouchpadScrollingMayBegin();
}
}
event->SetHandled();
}
void RenderWidgetHostViewEventHandler::OnTouchEvent(ui::TouchEvent* event) {
TRACE_EVENT0("input", "RenderWidgetHostViewBase::OnTouchEvent");
bool had_no_pointer = !pointer_state_.GetPointerCount();
// Update the touch event first.
if (!pointer_state_.OnTouch(*event)) {
event->StopPropagation();
return;
}
blink::WebTouchEvent touch_event;
bool handled =
delegate_->selection_controller()->WillHandleTouchEvent(pointer_state_);
if (handled) {
event->SetHandled();
} else {
touch_event = ui::CreateWebTouchEventFromMotionEvent(
pointer_state_, event->may_cause_scrolling(), event->hovering());
}
pointer_state_.CleanupRemovedTouchPoints(*event);
if (handled)
return;
if (had_no_pointer)
delegate_->selection_controller_client()->OnTouchDown();
if (!pointer_state_.GetPointerCount())
delegate_->selection_controller_client()->OnTouchUp();
// It is important to always mark events as being handled asynchronously when
// they are forwarded. This ensures that the current event does not get
// processed by the gesture recognizer before events currently awaiting
// dispatch in the touch queue.
event->DisableSynchronousHandling();
// Set unchanged touch point to StateStationary for touchmove and
// touchcancel to make sure only send one ack per WebTouchEvent.
MarkUnchangedTouchPointsAsStationary(&touch_event,
event->pointer_details().id);
if (ShouldRouteEvents()) {
host_->delegate()->GetInputEventRouter()->RouteTouchEvent(
host_view_, &touch_event, *event->latency());
} else {
ProcessTouchEvent(touch_event, *event->latency());
}
}
void RenderWidgetHostViewEventHandler::OnGestureEvent(ui::GestureEvent* event) {
TRACE_EVENT0("input", "RenderWidgetHostViewBase::OnGestureEvent");
// Ensure that we get keyboard focus on tap down as page may lose focus
// state previously (e.g. tapping outside to dismiss a select pop-up menu).
if (event->type() == ui::EventType::kGestureTap) {
SetKeyboardFocus();
}
if ((event->type() == ui::EventType::kGesturePinchBegin ||
event->type() == ui::EventType::kGesturePinchUpdate ||
event->type() == ui::EventType::kGesturePinchEnd) &&
!pinch_zoom_enabled_) {
event->SetHandled();
return;
}
HandleGestureForTouchSelection(event);
if (event->handled())
return;
// Confirm existing composition text on TAP gesture, to make sure the input
// caret won't be moved with an ongoing composition text.
if (event->type() == ui::EventType::kGestureTap) {
FinishImeCompositionSession();
}
blink::WebGestureEvent gesture = ui::MakeWebGestureEvent(*event);
if (event->type() == ui::EventType::kGestureTapDown) {
// Webkit does not stop a fling-scroll on tap-down. So explicitly send an
// event to stop any in-progress flings.
blink::WebGestureEvent fling_cancel = gesture;
fling_cancel.SetType(blink::WebInputEvent::Type::kGestureFlingCancel);
fling_cancel.SetSourceDevice(blink::WebGestureDevice::kTouchscreen);
fling_cancel.data.fling_cancel.prevent_boosting = false;
fling_cancel.data.fling_cancel.target_viewport = false;
if (ShouldRouteEvents()) {
host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
host_view_, &fling_cancel, ui::LatencyInfo());
} else {
host_->ForwardGestureEvent(fling_cancel);
}
}
if (gesture.GetType() != blink::WebInputEvent::Type::kUndefined) {
if (event->type() == ui::EventType::kGestureScrollBegin) {
// If there is a current scroll going on and a new scroll that isn't
// wheel based send a synthetic wheel event with kPhaseEnded to cancel
// the current scroll.
mouse_wheel_phase_handler_.DispatchPendingWheelEndEvent();
mouse_wheel_phase_handler_.SendWheelEndForTouchpadScrollingIfNeeded(
ShouldRouteEvents());
} else if (event->type() == ui::EventType::kScrollFlingStart) {
RecordAction(base::UserMetricsAction("TouchscreenScrollFling"));
}
if (event->type() == ui::EventType::kGestureScrollEnd ||
event->type() == ui::EventType::kScrollFlingStart) {
// Scrolling with touchscreen has finished. Make sure that the next wheel
// event will have phase = |kPhaseBegan|. This is for maintaining the
// correct phase info when some of the wheel events get ignored while a
// touchscreen scroll is going on.
mouse_wheel_phase_handler_.IgnorePendingWheelEndEvent();
mouse_wheel_phase_handler_.ResetTouchpadScrollSequence();
}
if (ShouldRouteEvents()) {
host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
host_view_, &gesture, *event->latency());
} else {
host_->GetRenderInputRouter()->ForwardGestureEventWithLatencyInfo(
gesture, *event->latency());
}
}
// If a gesture is not processed by the webpage, then WebKit processes it
// (e.g. generates synthetic mouse events).
event->SetHandled();
}
void RenderWidgetHostViewEventHandler::GestureEventAck(
const blink::WebGestureEvent& event,
blink::mojom::InputEventResultState ack_result) {
mouse_wheel_phase_handler_.GestureEventAck(event, ack_result);
HandleSwipeToMoveCursorGestureAck(event);
}
bool RenderWidgetHostViewEventHandler::CanRendererHandleEvent(
const ui::MouseEvent* event,
bool mouse_locked,
bool selection_popup) const {
if (event->type() == ui::EventType::kMouseCaptureChanged) {
return false;
}
if (event->type() == ui::EventType::kMouseExited) {
if (mouse_locked || selection_popup)
return false;
#if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
// Don't forward the mouse leave message which is received when the context
// menu is displayed by the page. This confuses the page and causes state
// changes.
if (host_->delegate() && host_->delegate()->IsShowingContextMenuOnPage())
return false;
#endif
return true;
}
#if BUILDFLAG(IS_WIN)
// Renderer cannot handle WM_XBUTTON or NC events.
switch (event->native_event().message) {
case WM_XBUTTONDOWN:
case WM_XBUTTONUP:
case WM_XBUTTONDBLCLK:
return true;
case WM_NCMOUSELEAVE:
case WM_NCMOUSEMOVE:
case WM_NCLBUTTONDOWN:
case WM_NCLBUTTONUP:
case WM_NCLBUTTONDBLCLK:
case WM_NCRBUTTONDOWN:
case WM_NCRBUTTONUP:
case WM_NCRBUTTONDBLCLK:
case WM_NCMBUTTONDOWN:
case WM_NCMBUTTONUP:
case WM_NCMBUTTONDBLCLK:
case WM_NCXBUTTONDOWN:
case WM_NCXBUTTONUP:
case WM_NCXBUTTONDBLCLK:
return false;
default:
break;
}
#endif
return true;
}
void RenderWidgetHostViewEventHandler::FinishImeCompositionSession() {
// RenderWidgetHostViewAura keeps track of existing composition texts. The
// call to finish composition text should be made through the RWHVA itself
// otherwise the following call to cancel composition will lead to an extra
// IPC for finishing the ongoing composition (see https://crbug.com/723024).
host_view_->GetTextInputClient()->ConfirmCompositionText(
/* keep_selection */ true);
host_view_->ImeCancelComposition();
}
void RenderWidgetHostViewEventHandler::ForwardMouseEventToParent(
ui::MouseEvent* event) {
// Needed to propagate mouse event to |window_->parent()->delegate()|, but
// note that it might be something other than a WebContentsViewAura instance.
// TODO(pkotwicz): Find a better way of doing this.
if (event->flags() & ui::EF_FROM_TOUCH)
return;
if (!window_->parent() || !window_->parent()->delegate())
return;
// Take a copy of |event|, to avoid ConvertLocationToTarget mutating the
// event.
std::unique_ptr<ui::Event> event_copy = event->Clone();
ui::MouseEvent* mouse_event = static_cast<ui::MouseEvent*>(event_copy.get());
mouse_event->ConvertLocationToTarget(window_.get(), window_->parent());
window_->parent()->delegate()->OnMouseEvent(mouse_event);
if (mouse_event->handled())
event->SetHandled();
}
void RenderWidgetHostViewEventHandler::HandleGestureForTouchSelection(
ui::GestureEvent* event) {
switch (event->type()) {
case ui::EventType::kGestureLongPress:
delegate_->selection_controller()->HandleLongPressEvent(
event->time_stamp(), event->location_f());
break;
case ui::EventType::kGestureTapDown:
if (event->details().tap_down_count() == 2) {
delegate_->selection_controller()->HandleDoublePressEvent(
event->time_stamp(), event->location_f());
}
break;
case ui::EventType::kGestureTap:
delegate_->selection_controller()->HandleTapEvent(
event->location_f(), event->details().tap_count());
break;
case ui::EventType::kGestureScrollBegin:
delegate_->selection_controller_client()->OnScrollStarted();
break;
case ui::EventType::kGestureScrollEnd:
delegate_->selection_controller_client()->OnScrollCompleted();
break;
default:
break;
}
}
void RenderWidgetHostViewEventHandler::HandleSwipeToMoveCursorGestureAck(
const blink::WebGestureEvent& event) {
if (!delegate_->selection_controller_client()) {
return;
}
switch (event.GetType()) {
case blink::WebInputEvent::Type::kGestureScrollBegin: {
if (!event.data.scroll_begin.cursor_control) {
break;
}
swipe_to_move_cursor_activated_ = true;
delegate_->selection_controller_client()->OnSwipeToMoveCursorBegin();
break;
}
case blink::WebInputEvent::Type::kGestureScrollEnd: {
if (!swipe_to_move_cursor_activated_) {
break;
}
swipe_to_move_cursor_activated_ = false;
delegate_->selection_controller_client()->OnSwipeToMoveCursorEnd();
break;
}
default:
break;
}
}
void RenderWidgetHostViewEventHandler::HandleMouseEventWhileLocked(
ui::MouseEvent* event) {
aura::client::CursorClient* cursor_client =
aura::client::GetCursorClient(window_->GetRootWindow());
DCHECK(!cursor_client || !cursor_client->IsCursorVisible());
if (event->type() == ui::EventType::kMousewheel) {
HandleMouseWheelEvent(event);
} else {
// If we receive non client mouse messages while we are in the locked state
// it probably means that the mouse left the borders of our window and
// needs to be moved back to the center.
if ((event->flags() & ui::EF_IS_NON_CLIENT) &&
!window_->GetHost()->SupportsMouseLock()) {
MoveCursorToCenter(event);
return;
}
blink::WebMouseEvent mouse_event = ui::MakeWebMouseEvent(*event);
ModifyEventMovementAndCoords(*event, &mouse_event);
bool is_selection_popup = NeedsInputGrab(popup_child_host_view_);
// Forward event to renderer.
if (CanRendererHandleEvent(event, mouse_locked_, is_selection_popup) &&
!(event->flags() & ui::EF_FROM_TOUCH)) {
if (ShouldRouteEvents()) {
host_->delegate()->GetInputEventRouter()->RouteMouseEvent(
host_view_, &mouse_event, *event->latency());
} else {
ProcessMouseEvent(mouse_event, *event->latency());
}
// Ensure that we get keyboard focus on mouse down as a plugin window
// may have grabbed keyboard focus.
if (event->type() == ui::EventType::kMousePressed) {
SetKeyboardFocus();
}
}
// Check if the mouse has reached the border and needs to be centered.
if (ShouldMoveToCenter(gfx::PointF(mouse_event.PositionInScreen()))) {
MoveCursorToCenter(event);
}
}
if (!ShouldGenerateAppCommand(event))
event->SetHandled();
}
void RenderWidgetHostViewEventHandler::ModifyEventMovementAndCoords(
const ui::MouseEvent& ui_mouse_event,
blink::WebMouseEvent* event) {
// This logic is similar to |is_move_to_center_event| check when
// consolidated_movement disabled. We can not guarantee that |MoveCursorTo|
// is taking effect immediately, so wait for the event that has matching
// coordinates to marked as synthesized event.
if (mouse_locked_ && MatchesSynthesizedMovePosition(*event)) {
event->SetModifiers(event->GetModifiers() |
blink::WebInputEvent::Modifiers::kRelativeMotionEvent);
synthetic_move_position_.reset();
return;
}
// Under mouse lock, coordinates of mouse are locked to what they were when
// mouse lock was entered.
if (!mouse_locked_) {
unlocked_mouse_position_ = event->PositionInWidget();
unlocked_global_mouse_position_ = event->PositionInScreen();
}
}
void RenderWidgetHostViewEventHandler::MoveCursorToCenter(
ui::MouseEvent* event) {
DCHECK(!window_->GetHost()->SupportsMouseLock());
gfx::Point center(gfx::Rect(window_->bounds().size()).CenterPoint());
gfx::Point center_in_screen(window_->GetBoundsInScreen().CenterPoint());
window_->MoveCursorTo(center);
#if BUILDFLAG(IS_WIN)
// TODO(crbug.com/40547981): This is a workaround for a bug from Windows
// update 16299, and should be remove once the bug is fixed in OS. Send a
// synthesized event to update the blink side states.
global_mouse_position_ = gfx::PointF(center_in_screen);
if (event) {
blink::WebMouseEvent mouse_event = ui::MakeWebMouseEvent(*event);
mouse_event.SetType(blink::WebMouseEvent::Type::kMouseMove);
mouse_event.SetModifiers(
mouse_event.GetModifiers() |
blink::WebInputEvent::Modifiers::kRelativeMotionEvent);
mouse_event.SetPositionInScreen(gfx::PointF(center_in_screen));
if (ShouldRouteEvents()) {
host_->delegate()->GetInputEventRouter()->RouteMouseEvent(
host_view_, &mouse_event, ui::LatencyInfo());
} else {
ProcessMouseEvent(mouse_event, ui::LatencyInfo());
}
return;
}
#endif
synthetic_move_position_ = center_in_screen;
}
bool RenderWidgetHostViewEventHandler::MatchesSynthesizedMovePosition(
const blink::WebMouseEvent& event) {
if (event.GetType() == blink::WebInputEvent::Type::kMouseMove &&
synthetic_move_position_.has_value()) {
if (IsFractionalScaleFactor(host_view_->GetDeviceScaleFactor())) {
// For fractional scale factors, the conversion from pixels to dip and
// vice versa could result in off by 1 or 2 errors which hurts us because
// the artificial move to center event cause the cursor to bounce around
// the center of the screen leading to the lock operation not working
// correctly. Workaround is to treat a mouse move or drag event off by
// atmost 2 px from the center as a move to center event.
// TODO(crbug.com/41474713): figure out a way to avoid the conversion
// error.
return ((std::abs(event.PositionInScreen().x() -
synthetic_move_position_->x()) <= 2) &&
(std::abs(event.PositionInScreen().y() -
synthetic_move_position_->y()) <= 2));
} else {
return synthetic_move_position_.value() ==
gfx::ToRoundedPoint(event.PositionInScreen());
}
}
return false;
}
void RenderWidgetHostViewEventHandler::SetKeyboardFocus() {
// TODO(wjmaclean): can host_ ever be null?
if (host_ && set_focus_on_mouse_down_or_key_event_) {
set_focus_on_mouse_down_or_key_event_ = false;
host_->Focus();
}
}
bool RenderWidgetHostViewEventHandler::ShouldMoveToCenter(
gfx::PointF mouse_screen_position) {
// Do not need to move to center in unadjusted movement mode as
// the movement value are directly from OS.
#if BUILDFLAG(IS_WIN)
if (mouse_locked_unadjusted_movement_)
return false;
#endif
if (window_->GetHost()->SupportsMouseLock())
return false;
gfx::Rect rect = window_->bounds();
rect = delegate_->ConvertRectToScreen(rect);
float border_x = rect.width() * kMouseLockBorderPercentage / 100.0;
float border_y = rect.height() * kMouseLockBorderPercentage / 100.0;
return mouse_screen_position.x() < rect.x() + border_x ||
mouse_screen_position.x() > rect.right() - border_x ||
mouse_screen_position.y() < rect.y() + border_y ||
mouse_screen_position.y() > rect.bottom() - border_y;
}
bool RenderWidgetHostViewEventHandler::ShouldRouteEvents() const {
if (!host_->delegate())
return false;
// Do not route events that are currently targeted to page popups such as
// <select> element drop-downs, since these cannot contain cross-process
// frames.
if (!host_->delegate()->IsWidgetForPrimaryMainFrame(host_))
return false;
return !!host_->delegate()->GetInputEventRouter();
}
void RenderWidgetHostViewEventHandler::ProcessMouseEvent(
const blink::WebMouseEvent& event,
const ui::LatencyInfo& latency) {
host_->ForwardMouseEventWithLatencyInfo(event, latency);
}
void RenderWidgetHostViewEventHandler::ProcessMouseWheelEvent(
const blink::WebMouseWheelEvent& event,
const ui::LatencyInfo& latency) {
host_->ForwardWheelEventWithLatencyInfo(event, latency);
}
void RenderWidgetHostViewEventHandler::ProcessTouchEvent(
const blink::WebTouchEvent& event,
const ui::LatencyInfo& latency) {
host_->GetRenderInputRouter()->ForwardTouchEventWithLatencyInfo(event,
latency);
}
bool RenderWidgetHostViewEventHandler::IsKeyLocked(const ui::KeyEvent& event) {
// Note: We never consider 'ESC' to be locked as we don't want to prevent it
// from being handled by the browser. Doing so would have adverse effects
// such as the user being unable to exit fullscreen mode.
if (!IsKeyboardLocked() || event.code() == ui::DomCode::ESCAPE)
return false;
return scoped_keyboard_hook_->IsKeyLocked(event.code());
}
} // namespace content