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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), wheel_target_(nullptr), scroll_manager_(scroll_manager) {} | 21 : frame_(frame), 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_); | |
26 visitor->Trace(scroll_manager_); | 25 visitor->Trace(scroll_manager_); |
27 } | 26 } |
28 | 27 |
29 void MouseWheelEventManager::Clear() { | |
30 wheel_target_ = nullptr; | |
31 } | |
32 | |
33 WebInputEventResult MouseWheelEventManager::HandleWheelEvent( | 28 WebInputEventResult MouseWheelEventManager::HandleWheelEvent( |
34 const WebMouseWheelEvent& event) { | 29 const WebMouseWheelEvent& event) { |
35 bool wheel_scroll_latching = | 30 #if OS(MACOSX) |
36 RuntimeEnabledFeatures::TouchpadAndWheelScrollLatchingEnabled(); | 31 // Filter Mac OS specific phases, usually with a zero-delta. |
| 32 // https://crbug.com/553732 |
| 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(); |
37 | 44 |
38 Document* doc = frame_->GetDocument(); | 45 if (doc->GetLayoutViewItem().IsNull()) |
39 if (!doc || doc->GetLayoutViewItem().IsNull()) | |
40 return WebInputEventResult::kNotHandled; | 46 return WebInputEventResult::kNotHandled; |
41 | 47 |
42 LocalFrameView* view = frame_->View(); | 48 LocalFrameView* view = frame_->View(); |
43 if (!view) | 49 if (!view) |
44 return WebInputEventResult::kNotHandled; | 50 return WebInputEventResult::kNotHandled; |
45 | 51 |
46 if (wheel_scroll_latching) { | |
47 const int kWheelEventPhaseEndedEventMask = | |
48 WebMouseWheelEvent::kPhaseEnded | WebMouseWheelEvent::kPhaseCancelled; | |
49 const int kWheelEventPhaseNoEventMask = | |
50 kWheelEventPhaseEndedEventMask | WebMouseWheelEvent::kPhaseMayBegin; | |
51 | |
52 if ((event.phase & kWheelEventPhaseEndedEventMask) || | |
53 (event.momentum_phase & kWheelEventPhaseEndedEventMask)) { | |
54 wheel_target_ = nullptr; | |
55 } | |
56 | |
57 if ((event.phase & kWheelEventPhaseNoEventMask) || | |
58 (event.momentum_phase & kWheelEventPhaseNoEventMask)) { | |
59 // Filter wheel events with zero deltas and reset the wheel_target_ node. | |
60 DCHECK(!event.delta_x && !event.delta_y); | |
61 return WebInputEventResult::kNotHandled; | |
62 } | |
63 | |
64 if (event.phase == WebMouseWheelEvent::kPhaseBegan) { | |
65 // Find and save the wheel_target_, this target will be used for the rest | |
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 | |
85 | |
86 wheel_target_ = FindTargetNode(event, doc, view); | |
87 } | |
88 | |
89 LocalFrame* subframe = | |
90 EventHandlingUtil::SubframeForTargetNode(wheel_target_.Get()); | |
91 if (subframe) { | |
92 WebInputEventResult result = | |
93 subframe->GetEventHandler().HandleWheelEvent(event); | |
94 if (result != WebInputEventResult::kNotHandled) | |
95 scroll_manager_->SetFrameWasScrolledByUser(); | |
96 return result; | |
97 } | |
98 | |
99 if (wheel_target_) { | |
100 WheelEvent* dom_event = | |
101 WheelEvent::Create(event, wheel_target_->GetDocument().domWindow()); | |
102 DispatchEventResult dom_event_result = | |
103 wheel_target_->DispatchEvent(dom_event); | |
104 if (dom_event_result != DispatchEventResult::kNotCanceled) | |
105 return EventHandlingUtil::ToWebInputEventResult(dom_event_result); | |
106 } | |
107 | |
108 return WebInputEventResult::kNotHandled; | |
109 } | |
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 = | 52 LayoutPoint v_point = |
116 view->RootFrameToContents(FlooredIntPoint(event.PositionInRootFrame())); | 53 view->RootFrameToContents(FlooredIntPoint(event.PositionInRootFrame())); |
117 | 54 |
118 HitTestRequest request(HitTestRequest::kReadOnly); | 55 HitTestRequest request(HitTestRequest::kReadOnly); |
119 HitTestResult result(request, v_point); | 56 HitTestResult result(request, v_point); |
120 doc->GetLayoutViewItem().HitTest(result); | 57 doc->GetLayoutViewItem().HitTest(result); |
121 | 58 |
122 Node* node = result.InnerNode(); | 59 Node* node = result.InnerNode(); |
123 // Wheel events should not dispatch to text nodes. | 60 // Wheel events should not dispatch to text nodes. |
124 if (node && node->IsTextNode()) | 61 if (node && node->IsTextNode()) |
125 node = FlatTreeTraversal::Parent(*node); | 62 node = FlatTreeTraversal::Parent(*node); |
126 | 63 |
127 // If we're over the frame scrollbar, scroll the document. | 64 // If we're over the frame scrollbar, scroll the document. |
128 if (!node && result.GetScrollbar()) | 65 if (!node && result.GetScrollbar()) |
129 node = doc->documentElement(); | 66 node = doc->documentElement(); |
130 | 67 |
131 return node; | 68 LocalFrame* subframe = EventHandlingUtil::SubframeForTargetNode(node); |
| 69 if (subframe) { |
| 70 WebInputEventResult result = |
| 71 subframe->GetEventHandler().HandleWheelEvent(event); |
| 72 if (result != WebInputEventResult::kNotHandled) |
| 73 scroll_manager_->SetFrameWasScrolledByUser(); |
| 74 return result; |
| 75 } |
| 76 |
| 77 if (node) { |
| 78 WheelEvent* dom_event = |
| 79 WheelEvent::Create(event, node->GetDocument().domWindow()); |
| 80 DispatchEventResult dom_event_result = node->DispatchEvent(dom_event); |
| 81 if (dom_event_result != DispatchEventResult::kNotCanceled) |
| 82 return EventHandlingUtil::ToWebInputEventResult(dom_event_result); |
| 83 } |
| 84 |
| 85 return WebInputEventResult::kNotHandled; |
132 } | 86 } |
133 | 87 |
134 } // namespace blink | 88 } // namespace blink |
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