Index: third_party/WebKit/Source/core/input/MouseWheelEventManager.cpp |
diff --git a/third_party/WebKit/Source/core/input/MouseWheelEventManager.cpp b/third_party/WebKit/Source/core/input/MouseWheelEventManager.cpp |
index e830907851620108275d6043da95b7b8d3ed2e5f..6a8a3087538e52213c18337f92d7e8e913e26bda 100644 |
--- a/third_party/WebKit/Source/core/input/MouseWheelEventManager.cpp |
+++ b/third_party/WebKit/Source/core/input/MouseWheelEventManager.cpp |
@@ -18,54 +18,76 @@ |
namespace blink { |
MouseWheelEventManager::MouseWheelEventManager(LocalFrame& frame, |
ScrollManager& scroll_manager) |
- : frame_(frame), scroll_manager_(scroll_manager) {} |
+ : frame_(frame), wheel_target_(nullptr), scroll_manager_(scroll_manager) {} |
DEFINE_TRACE(MouseWheelEventManager) { |
visitor->Trace(frame_); |
+ visitor->Trace(wheel_target_); |
visitor->Trace(scroll_manager_); |
} |
+void MouseWheelEventManager::Clear() { |
+ wheel_target_ = nullptr; |
+} |
+ |
WebInputEventResult MouseWheelEventManager::HandleWheelEvent( |
const WebMouseWheelEvent& event) { |
-#if OS(MACOSX) |
- // Filter Mac OS specific phases, usually with a zero-delta. |
- // https://crbug.com/553732 |
- // TODO(chongz): EventSender sends events with |
- // |WebMouseWheelEvent::PhaseNone|, |
- // but it shouldn't. |
- const int kWheelEventPhaseNoEventMask = WebMouseWheelEvent::kPhaseEnded | |
- WebMouseWheelEvent::kPhaseCancelled | |
- WebMouseWheelEvent::kPhaseMayBegin; |
- if ((event.phase & kWheelEventPhaseNoEventMask) || |
- (event.momentum_phase & kWheelEventPhaseNoEventMask)) |
- return WebInputEventResult::kNotHandled; |
-#endif |
- Document* doc = frame_->GetDocument(); |
+ bool wheel_scroll_latching = |
+ RuntimeEnabledFeatures::TouchpadAndWheelScrollLatchingEnabled(); |
- if (doc->GetLayoutViewItem().IsNull()) |
+ Document* doc = frame_->GetDocument(); |
+ if (!doc || doc->GetLayoutViewItem().IsNull()) |
return WebInputEventResult::kNotHandled; |
LocalFrameView* view = frame_->View(); |
if (!view) |
return WebInputEventResult::kNotHandled; |
- LayoutPoint v_point = |
- view->RootFrameToContents(FlooredIntPoint(event.PositionInRootFrame())); |
+ if (wheel_scroll_latching) { |
+ const int kWheelEventPhaseEndedEventMask = |
+ WebMouseWheelEvent::kPhaseEnded | WebMouseWheelEvent::kPhaseCancelled; |
+ const int kWheelEventPhaseNoEventMask = |
+ kWheelEventPhaseEndedEventMask | WebMouseWheelEvent::kPhaseMayBegin; |
- HitTestRequest request(HitTestRequest::kReadOnly); |
- HitTestResult result(request, v_point); |
- doc->GetLayoutViewItem().HitTest(result); |
+ if ((event.phase & kWheelEventPhaseEndedEventMask) || |
+ (event.momentum_phase & kWheelEventPhaseEndedEventMask)) { |
+ wheel_target_ = nullptr; |
+ } |
- Node* node = result.InnerNode(); |
- // Wheel events should not dispatch to text nodes. |
- if (node && node->IsTextNode()) |
- node = FlatTreeTraversal::Parent(*node); |
+ if ((event.phase & kWheelEventPhaseNoEventMask) || |
+ (event.momentum_phase & kWheelEventPhaseNoEventMask)) { |
+ // Filter wheel events with zero deltas and reset the wheel_target_ node. |
+ DCHECK(!event.delta_x && !event.delta_y); |
+ return WebInputEventResult::kNotHandled; |
+ } |
- // If we're over the frame scrollbar, scroll the document. |
- if (!node && result.GetScrollbar()) |
- node = doc->documentElement(); |
+ if (event.phase == WebMouseWheelEvent::kPhaseBegan) { |
+ // Find and save the wheel_target_, this target will be used for the rest |
+ // of the current scrolling sequence. |
+ DCHECK(!wheel_target_); |
+ wheel_target_ = FindTargetNode(event, doc, view); |
+ } |
+ } else { // !wheel_scroll_latching, wheel_target_ will be updated for each |
+ // wheel event. |
+#if OS(MACOSX) |
+ // Filter Mac OS specific phases, usually with a zero-delta. |
+ // https://crbug.com/553732 |
+ // TODO(chongz): EventSender sends events with |
+ // |WebMouseWheelEvent::PhaseNone|, |
+ // but it shouldn't. |
+ const int kWheelEventPhaseNoEventMask = |
+ WebMouseWheelEvent::kPhaseEnded | WebMouseWheelEvent::kPhaseCancelled | |
+ WebMouseWheelEvent::kPhaseMayBegin; |
+ if ((event.phase & kWheelEventPhaseNoEventMask) || |
+ (event.momentum_phase & kWheelEventPhaseNoEventMask)) |
+ return WebInputEventResult::kNotHandled; |
+#endif |
- LocalFrame* subframe = EventHandlingUtil::SubframeForTargetNode(node); |
+ wheel_target_ = FindTargetNode(event, doc, view); |
+ } |
+ |
+ LocalFrame* subframe = |
+ EventHandlingUtil::SubframeForTargetNode(wheel_target_.Get()); |
if (subframe) { |
WebInputEventResult result = |
subframe->GetEventHandler().HandleWheelEvent(event); |
@@ -74,10 +96,11 @@ WebInputEventResult MouseWheelEventManager::HandleWheelEvent( |
return result; |
} |
- if (node) { |
+ if (wheel_target_) { |
WheelEvent* dom_event = |
- WheelEvent::Create(event, node->GetDocument().domWindow()); |
- DispatchEventResult dom_event_result = node->DispatchEvent(dom_event); |
+ WheelEvent::Create(event, wheel_target_->GetDocument().domWindow()); |
+ DispatchEventResult dom_event_result = |
+ wheel_target_->DispatchEvent(dom_event); |
if (dom_event_result != DispatchEventResult::kNotCanceled) |
return EventHandlingUtil::ToWebInputEventResult(dom_event_result); |
} |
@@ -85,4 +108,27 @@ WebInputEventResult MouseWheelEventManager::HandleWheelEvent( |
return WebInputEventResult::kNotHandled; |
} |
+Node* MouseWheelEventManager::FindTargetNode(const WebMouseWheelEvent& event, |
+ const Document* doc, |
+ const LocalFrameView* view) { |
+ DCHECK(doc && !doc->GetLayoutViewItem().IsNull() && view); |
+ LayoutPoint v_point = |
+ view->RootFrameToContents(FlooredIntPoint(event.PositionInRootFrame())); |
+ |
+ HitTestRequest request(HitTestRequest::kReadOnly); |
+ HitTestResult result(request, v_point); |
+ doc->GetLayoutViewItem().HitTest(result); |
+ |
+ Node* node = result.InnerNode(); |
+ // Wheel events should not dispatch to text nodes. |
+ if (node && node->IsTextNode()) |
+ node = FlatTreeTraversal::Parent(*node); |
+ |
+ // If we're over the frame scrollbar, scroll the document. |
+ if (!node && result.GetScrollbar()) |
+ node = doc->documentElement(); |
+ |
+ return node; |
+} |
+ |
} // namespace blink |