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1 // Copyright 2017 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/input/MouseWheelEventManager.h" | 5 #include "core/input/MouseWheelEventManager.h" |
6 | 6 |
7 #include "core/dom/Document.h" | 7 #include "core/dom/Document.h" |
8 #include "core/events/WheelEvent.h" | 8 #include "core/events/WheelEvent.h" |
9 #include "core/frame/LocalFrameView.h" | 9 #include "core/frame/LocalFrameView.h" |
10 #include "core/input/EventHandler.h" | 10 #include "core/input/EventHandler.h" |
11 #include "core/input/EventHandlingUtil.h" | 11 #include "core/input/EventHandlingUtil.h" |
12 #include "core/input/ScrollManager.h" | 12 #include "core/input/ScrollManager.h" |
13 #include "core/layout/HitTestRequest.h" | 13 #include "core/layout/HitTestRequest.h" |
14 #include "core/layout/HitTestResult.h" | 14 #include "core/layout/HitTestResult.h" |
15 #include "core/layout/api/LayoutViewItem.h" | 15 #include "core/layout/api/LayoutViewItem.h" |
16 #include "public/platform/WebMouseWheelEvent.h" | 16 #include "public/platform/WebMouseWheelEvent.h" |
17 | 17 |
18 namespace blink { | 18 namespace blink { |
19 MouseWheelEventManager::MouseWheelEventManager(LocalFrame& frame, | 19 MouseWheelEventManager::MouseWheelEventManager(LocalFrame& frame, |
20 ScrollManager& scroll_manager) | 20 ScrollManager& scroll_manager) |
21 : frame_(frame), scroll_manager_(scroll_manager) {} | 21 : frame_(frame), wheel_target_(nullptr), scroll_manager_(scroll_manager) {} |
22 | 22 |
23 DEFINE_TRACE(MouseWheelEventManager) { | 23 DEFINE_TRACE(MouseWheelEventManager) { |
24 visitor->Trace(frame_); | 24 visitor->Trace(frame_); |
25 visitor->Trace(wheel_target_); | |
25 visitor->Trace(scroll_manager_); | 26 visitor->Trace(scroll_manager_); |
26 } | 27 } |
27 | 28 |
29 void MouseWheelEventManager::Clear() { | |
30 wheel_target_ = nullptr; | |
31 } | |
32 | |
28 WebInputEventResult MouseWheelEventManager::HandleWheelEvent( | 33 WebInputEventResult MouseWheelEventManager::HandleWheelEvent( |
29 const WebMouseWheelEvent& event) { | 34 const WebMouseWheelEvent& event) { |
35 bool wheel_scroll_latching = | |
36 RuntimeEnabledFeatures::TouchpadAndWheelScrollLatchingEnabled(); | |
37 | |
38 if (wheel_scroll_latching) { | |
39 const int kWheelEventPhaseNoEventMask = | |
40 WebMouseWheelEvent::kPhaseEnded | WebMouseWheelEvent::kPhaseCancelled | | |
41 WebMouseWheelEvent::kPhaseMayBegin; | |
bokan
2017/06/15 15:47:18
Do we really need to clear the target on MayBegin?
sahel
2017/06/16 14:56:20
Done.
| |
42 | |
43 if ((event.phase & kWheelEventPhaseNoEventMask) || | |
44 (event.momentum_phase & kWheelEventPhaseNoEventMask)) { | |
45 // Filter wheel events with zero deltas and reset the wheel_target_ node. | |
46 DCHECK(!event.delta_x && !event.delta_y); | |
47 wheel_target_ = nullptr; | |
48 return WebInputEventResult::kNotHandled; | |
49 } | |
50 | |
51 if (event.phase == WebMouseWheelEvent::kPhaseBegan) { | |
52 // Find and save the wheel_target_, this target will be used for the rest | |
53 // of the current scrolling sequence. | |
54 DCHECK(!wheel_target_); | |
55 Document* doc = frame_->GetDocument(); | |
56 | |
57 if (doc->GetLayoutViewItem().IsNull()) | |
58 return WebInputEventResult::kNotHandled; | |
59 | |
60 LocalFrameView* view = frame_->View(); | |
61 if (!view) | |
62 return WebInputEventResult::kNotHandled; | |
bokan
2017/06/15 15:47:18
Add the early out at the top of the method if ther
sahel
2017/06/16 14:56:20
Done.
| |
63 | |
64 LayoutPoint v_point = view->RootFrameToContents( | |
65 FlooredIntPoint(event.PositionInRootFrame())); | |
66 | |
67 HitTestRequest request(HitTestRequest::kReadOnly); | |
68 HitTestResult result(request, v_point); | |
69 doc->GetLayoutViewItem().HitTest(result); | |
70 | |
71 wheel_target_ = result.InnerNode(); | |
72 // Wheel events should not dispatch to text nodes. | |
73 if (wheel_target_ && wheel_target_->IsTextNode()) | |
74 wheel_target_ = FlatTreeTraversal::Parent(*wheel_target_); | |
75 | |
76 // If we're over the frame scrollbar, scroll the document. | |
77 if (!wheel_target_ && result.GetScrollbar()) | |
78 wheel_target_ = doc->documentElement(); | |
79 } | |
80 } else { // !wheel_scroll_latching, wheel_target_ will be updated for each | |
81 // wheel event. | |
30 #if OS(MACOSX) | 82 #if OS(MACOSX) |
31 // Filter Mac OS specific phases, usually with a zero-delta. | 83 // Filter Mac OS specific phases, usually with a zero-delta. |
32 // https://crbug.com/553732 | 84 // https://crbug.com/553732 |
33 // TODO(chongz): EventSender sends events with | 85 // TODO(chongz): EventSender sends events with |
34 // |WebMouseWheelEvent::PhaseNone|, | 86 // |WebMouseWheelEvent::PhaseNone|, |
35 // but it shouldn't. | 87 // but it shouldn't. |
36 const int kWheelEventPhaseNoEventMask = WebMouseWheelEvent::kPhaseEnded | | 88 const int kWheelEventPhaseNoEventMask = |
37 WebMouseWheelEvent::kPhaseCancelled | | 89 WebMouseWheelEvent::kPhaseEnded | WebMouseWheelEvent::kPhaseCancelled | |
38 WebMouseWheelEvent::kPhaseMayBegin; | 90 WebMouseWheelEvent::kPhaseMayBegin; |
39 if ((event.phase & kWheelEventPhaseNoEventMask) || | 91 if ((event.phase & kWheelEventPhaseNoEventMask) || |
40 (event.momentum_phase & kWheelEventPhaseNoEventMask)) | 92 (event.momentum_phase & kWheelEventPhaseNoEventMask)) |
41 return WebInputEventResult::kNotHandled; | 93 return WebInputEventResult::kNotHandled; |
42 #endif | 94 #endif |
43 Document* doc = frame_->GetDocument(); | |
44 | 95 |
45 if (doc->GetLayoutViewItem().IsNull()) | 96 Document* doc = frame_->GetDocument(); |
46 return WebInputEventResult::kNotHandled; | |
47 | 97 |
48 LocalFrameView* view = frame_->View(); | 98 if (doc->GetLayoutViewItem().IsNull()) |
49 if (!view) | 99 return WebInputEventResult::kNotHandled; |
50 return WebInputEventResult::kNotHandled; | |
51 | 100 |
52 LayoutPoint v_point = | 101 LocalFrameView* view = frame_->View(); |
53 view->RootFrameToContents(FlooredIntPoint(event.PositionInRootFrame())); | 102 if (!view) |
103 return WebInputEventResult::kNotHandled; | |
54 | 104 |
55 HitTestRequest request(HitTestRequest::kReadOnly); | 105 LayoutPoint v_point = |
bokan
2017/06/15 15:47:17
Everything from here to end of the block is identi
sahel
2017/06/16 14:56:20
Done.
| |
56 HitTestResult result(request, v_point); | 106 view->RootFrameToContents(FlooredIntPoint(event.PositionInRootFrame())); |
57 doc->GetLayoutViewItem().HitTest(result); | |
58 | 107 |
59 Node* node = result.InnerNode(); | 108 HitTestRequest request(HitTestRequest::kReadOnly); |
60 // Wheel events should not dispatch to text nodes. | 109 HitTestResult result(request, v_point); |
61 if (node && node->IsTextNode()) | 110 doc->GetLayoutViewItem().HitTest(result); |
62 node = FlatTreeTraversal::Parent(*node); | |
63 | 111 |
64 // If we're over the frame scrollbar, scroll the document. | 112 Node* node = result.InnerNode(); |
65 if (!node && result.GetScrollbar()) | 113 // Wheel events should not dispatch to text nodes. |
66 node = doc->documentElement(); | 114 if (node && node->IsTextNode()) |
115 node = FlatTreeTraversal::Parent(*node); | |
67 | 116 |
68 LocalFrame* subframe = EventHandlingUtil::SubframeForTargetNode(node); | 117 // If we're over the frame scrollbar, scroll the document. |
118 if (!node && result.GetScrollbar()) | |
119 node = doc->documentElement(); | |
120 | |
121 wheel_target_ = node; | |
122 } | |
123 | |
124 LocalFrame* subframe = | |
125 EventHandlingUtil::SubframeForTargetNode(wheel_target_.Get()); | |
69 if (subframe) { | 126 if (subframe) { |
70 WebInputEventResult result = | 127 WebInputEventResult result = |
71 subframe->GetEventHandler().HandleWheelEvent(event); | 128 subframe->GetEventHandler().HandleWheelEvent(event); |
72 if (result != WebInputEventResult::kNotHandled) | 129 if (result != WebInputEventResult::kNotHandled) |
73 scroll_manager_->SetFrameWasScrolledByUser(); | 130 scroll_manager_->SetFrameWasScrolledByUser(); |
74 return result; | 131 return result; |
75 } | 132 } |
76 | 133 |
77 if (node) { | 134 if (wheel_target_) { |
78 WheelEvent* dom_event = | 135 WheelEvent* dom_event = |
79 WheelEvent::Create(event, node->GetDocument().domWindow()); | 136 WheelEvent::Create(event, wheel_target_->GetDocument().domWindow()); |
80 DispatchEventResult dom_event_result = node->DispatchEvent(dom_event); | 137 DispatchEventResult dom_event_result = |
138 wheel_target_->DispatchEvent(dom_event); | |
81 if (dom_event_result != DispatchEventResult::kNotCanceled) | 139 if (dom_event_result != DispatchEventResult::kNotCanceled) |
82 return EventHandlingUtil::ToWebInputEventResult(dom_event_result); | 140 return EventHandlingUtil::ToWebInputEventResult(dom_event_result); |
83 } | 141 } |
84 | 142 |
85 return WebInputEventResult::kNotHandled; | 143 return WebInputEventResult::kNotHandled; |
86 } | 144 } |
87 | 145 |
88 } // namespace blink | 146 } // namespace blink |
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