Removed m_previousWheelScrolledNode from EventHandler

third_party/WebKit/Source/core/input/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 268 matching lines @@
     visitor->trace(m_frame);
     visitor->trace(m_mousePressNode);
     visitor->trace(m_resizeScrollableArea);
     visitor->trace(m_capturingMouseEventsNode);
     visitor->trace(m_nodeUnderMouse);
     visitor->trace(m_lastMouseMoveEventSubframe);
     visitor->trace(m_lastScrollbarUnderMouse);
     visitor->trace(m_clickNode);
     visitor->trace(m_dragTarget);
     visitor->trace(m_frameSetBeingResized);
-    visitor->trace(m_previousWheelScrolledNode);
     visitor->trace(m_scrollbarHandlingScrollGesture);
     visitor->trace(m_targetForTouchID);
     visitor->trace(m_touchSequenceDocument);
     visitor->trace(m_scrollGestureHandlingNode);
     visitor->trace(m_previousGestureScrolledNode);
     visitor->trace(m_lastDeferredTapElement);
     visitor->trace(m_selectionController);
     visitor->trace(m_pointerEventManager);
 #endif
 }
@@ skipping 20 matching lines @@
     m_dragTarget = nullptr;
     m_shouldOnlyFireDragOverEvent = false;
     m_mousePositionIsUnknown = true;
     m_lastKnownMousePosition = IntPoint();
     m_lastKnownMouseGlobalPosition = IntPoint();
     m_lastMouseDownUserGestureToken.clear();
     m_mousePressNode = nullptr;
     m_mousePressed = false;
     m_capturesDragging = false;
     m_capturingMouseEventsNode = nullptr;
-    m_previousWheelScrolledNode = nullptr;
     m_targetForTouchID.clear();
     m_touchSequenceDocument.clear();
     m_touchSequenceUserGestureToken.clear();
     clearGestureScrollState();
     m_lastGestureScrollOverWidget = false;
     m_scrollbarHandlingScrollGesture = nullptr;
     m_touchPressed = false;
     m_pointerEventManager.clear();
     m_inPointerCanceledState = false;
     m_mouseDownMayStartDrag = false;
@@ skipping 1444 matching lines @@
 
     HitTestRequest request(HitTestRequest::ReadOnly);
     HitTestResult result(request, vPoint);
     doc->layoutView()->hitTest(result);
 
     Node* node = result.innerNode();
     // Wheel events should not dispatch to text nodes.
     if (node && node->isTextNode())
         node = FlatTreeTraversal::parent(*node);
 
-    if (m_previousWheelScrolledNode)
-        m_previousWheelScrolledNode = nullptr;
-
     bool isOverWidget = result.isOverWidget();
 
     if (node) {
         // Figure out which view to send the event to.
         LayoutObject* target = node->layoutObject();
 
         if (isOverWidget && target && target->isLayoutPart()) {
             if (Widget* widget = toLayoutPart(target)->widget()) {
                 WebInputEventResult result = passWheelEventToWidget(event, *widget);
                 if (result != WebInputEventResult::NotHandled) {
@@ skipping 34 matching lines @@
 
 void EventHandler::defaultWheelEventHandler(Node* startNode, WheelEvent* wheelEvent)
 {
     if (!startNode || !wheelEvent)
         return;
 
     // When the wheelEvent do not scroll, we trigger zoom in/out instead.
     if (!wheelEvent->canScroll())
         return;
 
-    Node* stopNode = m_previousWheelScrolledNode.get();
     ScrollGranularity granularity = wheelGranularityToScrollGranularity(wheelEvent);
+    Node* node = nullptr;
 
     // Break up into two scrolls if we need to.  Diagonal movement on
     // a MacBook pro is an example of a 2-dimensional mouse wheel event (where both deltaX and deltaY can be set).
 
     // FIXME: enable scroll customization in this case. See crbug.com/410974.
     if (wheelEvent->getRailsMode() != Event::RailsModeVertical
-        && scroll(ScrollRightIgnoringWritingMode, granularity, startNode, &stopNode, wheelEvent->deltaX()).didScroll)
+        && scroll(ScrollRightIgnoringWritingMode, granularity, startNode, &node, wheelEvent->deltaX()).didScroll)
         wheelEvent->setDefaultHandled();
 
     if (wheelEvent->getRailsMode() != Event::RailsModeHorizontal
-        && scroll(ScrollDownIgnoringWritingMode, granularity, startNode, &stopNode, wheelEvent->deltaY()).didScroll)
+        && scroll(ScrollDownIgnoringWritingMode, granularity, startNode, &node, wheelEvent->deltaY()).didScroll)
         wheelEvent->setDefaultHandled();
-
-    m_previousWheelScrolledNode = stopNode;
 }
 
 WebInputEventResult EventHandler::handleGestureShowPress()
 {
     m_lastShowPressTimestamp = WTF::monotonicallyIncreasingTime();
 
     FrameView* view = m_frame->view();
     if (!view)
         return WebInputEventResult::NotHandled;
     if (ScrollAnimatorBase* scrollAnimator = view->existingScrollAnimator())
@@ skipping 2104 matching lines @@
 PlatformEvent::Modifiers EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return static_cast<PlatformEvent::Modifiers>(PlatformEvent::CtrlKey | PlatformEvent::AltKey);
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink