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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) { |
30 #if OS(MACOSX) | 35 bool wheel_scroll_latching = |
31 // Filter Mac OS specific phases, usually with a zero-delta. | 36 RuntimeEnabledFeatures::TouchpadAndWheelScrollLatchingEnabled(); |
32 // https://crbug.com/553732 | 37 |
33 // TODO(chongz): EventSender sends events with | |
34 // |WebMouseWheelEvent::PhaseNone|, | |
35 // but it shouldn't. | |
36 const int kWheelEventPhaseNoEventMask = WebMouseWheelEvent::kPhaseEnded | | |
37 WebMouseWheelEvent::kPhaseCancelled | | |
38 WebMouseWheelEvent::kPhaseMayBegin; | |
39 if ((event.phase & kWheelEventPhaseNoEventMask) || | |
40 (event.momentum_phase & kWheelEventPhaseNoEventMask)) | |
41 return WebInputEventResult::kNotHandled; | |
42 #endif | |
43 Document* doc = frame_->GetDocument(); | 38 Document* doc = frame_->GetDocument(); |
44 | 39 if (!doc || doc->GetLayoutViewItem().IsNull()) |
45 if (doc->GetLayoutViewItem().IsNull()) | |
46 return WebInputEventResult::kNotHandled; | 40 return WebInputEventResult::kNotHandled; |
47 | 41 |
48 LocalFrameView* view = frame_->View(); | 42 LocalFrameView* view = frame_->View(); |
49 if (!view) | 43 if (!view) |
50 return WebInputEventResult::kNotHandled; | 44 return WebInputEventResult::kNotHandled; |
51 | 45 |
52 LayoutPoint v_point = | 46 if (wheel_scroll_latching) { |
53 view->RootFrameToContents(FlooredIntPoint(event.PositionInRootFrame())); | 47 const int kWheelEventPhaseEndedEventMask = |
| 48 WebMouseWheelEvent::kPhaseEnded | WebMouseWheelEvent::kPhaseCancelled; |
| 49 const int kWheelEventPhaseNoEventMask = |
| 50 kWheelEventPhaseEndedEventMask | WebMouseWheelEvent::kPhaseMayBegin; |
54 | 51 |
55 HitTestRequest request(HitTestRequest::kReadOnly); | 52 if ((event.phase & kWheelEventPhaseEndedEventMask) || |
56 HitTestResult result(request, v_point); | 53 (event.momentum_phase & kWheelEventPhaseEndedEventMask)) { |
57 doc->GetLayoutViewItem().HitTest(result); | 54 wheel_target_ = nullptr; |
| 55 } |
58 | 56 |
59 Node* node = result.InnerNode(); | 57 if ((event.phase & kWheelEventPhaseNoEventMask) || |
60 // Wheel events should not dispatch to text nodes. | 58 (event.momentum_phase & kWheelEventPhaseNoEventMask)) { |
61 if (node && node->IsTextNode()) | 59 // Filter wheel events with zero deltas and reset the wheel_target_ node. |
62 node = FlatTreeTraversal::Parent(*node); | 60 DCHECK(!event.delta_x && !event.delta_y); |
| 61 return WebInputEventResult::kNotHandled; |
| 62 } |
63 | 63 |
64 // If we're over the frame scrollbar, scroll the document. | 64 if (event.phase == WebMouseWheelEvent::kPhaseBegan) { |
65 if (!node && result.GetScrollbar()) | 65 // Find and save the wheel_target_, this target will be used for the rest |
66 node = doc->documentElement(); | 66 // of the current scrolling sequence. |
| 67 DCHECK(!wheel_target_); |
| 68 wheel_target_ = FindTargetNode(event, doc, view); |
| 69 } |
| 70 } else { // !wheel_scroll_latching, wheel_target_ will be updated for each |
| 71 // wheel event. |
| 72 #if OS(MACOSX) |
| 73 // Filter Mac OS specific phases, usually with a zero-delta. |
| 74 // https://crbug.com/553732 |
| 75 // TODO(chongz): EventSender sends events with |
| 76 // |WebMouseWheelEvent::PhaseNone|, |
| 77 // but it shouldn't. |
| 78 const int kWheelEventPhaseNoEventMask = |
| 79 WebMouseWheelEvent::kPhaseEnded | WebMouseWheelEvent::kPhaseCancelled | |
| 80 WebMouseWheelEvent::kPhaseMayBegin; |
| 81 if ((event.phase & kWheelEventPhaseNoEventMask) || |
| 82 (event.momentum_phase & kWheelEventPhaseNoEventMask)) |
| 83 return WebInputEventResult::kNotHandled; |
| 84 #endif |
67 | 85 |
68 LocalFrame* subframe = EventHandlingUtil::SubframeForTargetNode(node); | 86 wheel_target_ = FindTargetNode(event, doc, view); |
| 87 } |
| 88 |
| 89 LocalFrame* subframe = |
| 90 EventHandlingUtil::SubframeForTargetNode(wheel_target_.Get()); |
69 if (subframe) { | 91 if (subframe) { |
70 WebInputEventResult result = | 92 WebInputEventResult result = |
71 subframe->GetEventHandler().HandleWheelEvent(event); | 93 subframe->GetEventHandler().HandleWheelEvent(event); |
72 if (result != WebInputEventResult::kNotHandled) | 94 if (result != WebInputEventResult::kNotHandled) |
73 scroll_manager_->SetFrameWasScrolledByUser(); | 95 scroll_manager_->SetFrameWasScrolledByUser(); |
74 return result; | 96 return result; |
75 } | 97 } |
76 | 98 |
77 if (node) { | 99 if (wheel_target_) { |
78 WheelEvent* dom_event = | 100 WheelEvent* dom_event = |
79 WheelEvent::Create(event, node->GetDocument().domWindow()); | 101 WheelEvent::Create(event, wheel_target_->GetDocument().domWindow()); |
80 DispatchEventResult dom_event_result = node->DispatchEvent(dom_event); | 102 DispatchEventResult dom_event_result = |
| 103 wheel_target_->DispatchEvent(dom_event); |
81 if (dom_event_result != DispatchEventResult::kNotCanceled) | 104 if (dom_event_result != DispatchEventResult::kNotCanceled) |
82 return EventHandlingUtil::ToWebInputEventResult(dom_event_result); | 105 return EventHandlingUtil::ToWebInputEventResult(dom_event_result); |
83 } | 106 } |
84 | 107 |
85 return WebInputEventResult::kNotHandled; | 108 return WebInputEventResult::kNotHandled; |
86 } | 109 } |
87 | 110 |
| 111 Node* MouseWheelEventManager::FindTargetNode(const WebMouseWheelEvent& event, |
| 112 const Document* doc, |
| 113 const LocalFrameView* view) { |
| 114 DCHECK(doc && !doc->GetLayoutViewItem().IsNull() && view); |
| 115 LayoutPoint v_point = |
| 116 view->RootFrameToContents(FlooredIntPoint(event.PositionInRootFrame())); |
| 117 |
| 118 HitTestRequest request(HitTestRequest::kReadOnly); |
| 119 HitTestResult result(request, v_point); |
| 120 doc->GetLayoutViewItem().HitTest(result); |
| 121 |
| 122 Node* node = result.InnerNode(); |
| 123 // Wheel events should not dispatch to text nodes. |
| 124 if (node && node->IsTextNode()) |
| 125 node = FlatTreeTraversal::Parent(*node); |
| 126 |
| 127 // If we're over the frame scrollbar, scroll the document. |
| 128 if (!node && result.GetScrollbar()) |
| 129 node = doc->documentElement(); |
| 130 |
| 131 return node; |
| 132 } |
| 133 |
88 } // namespace blink | 134 } // namespace blink |
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