Canvas2d: Implement rerouting event by hit region's control.

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 38 matching lines @@
 #include "core/events/TextEvent.h"
 #include "core/events/TouchEvent.h"
 #include "core/events/WheelEvent.h"
 #include "core/fetch/ImageResource.h"
 #include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/frame/VisualViewport.h"
+#include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLDialogElement.h"
 #include "core/html/HTMLFrameElementBase.h"
 #include "core/html/HTMLFrameSetElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/input/InputDeviceCapabilities.h"
 #include "core/input/TouchActionUtil.h"
 #include "core/layout/HitTestRequest.h"
 #include "core/layout/HitTestResult.h"
 #include "core/layout/LayoutPart.h"
 #include "core/layout/LayoutTextControlSingleLine.h"
@@ skipping 212 matching lines @@
     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_scrollbarHandlingScrollGesture);
     visitor->trace(m_targetForTouchID);
+    visitor->trace(m_regionForTouchID);
     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
 }
 
 DragState& EventHandler::dragState()
@@ skipping 3378 matching lines @@
             continue;
 
         RefPtrWillBeRawPtr<Touch> touch = Touch::create(
             touchInfo.targetFrame.get(),
             touchInfo.touchTarget.get(),
             point.id(),
             point.screenPos(),
             touchInfo.adjustedPagePoint,
             touchInfo.adjustedRadius,
             point.rotationAngle(),
-            point.force());
+            point.force(),
+            touchInfo.region);
 
         // Ensure this target's touch list exists, even if it ends up empty, so
         // it can always be passed to TouchEvent::Create below.
         TargetTouchesHeapMap::iterator targetTouchesIterator = touchesByTarget.find(touchInfo.touchTarget.get());
         if (targetTouchesIterator == touchesByTarget.end()) {
             touchesByTarget.set(touchInfo.touchTarget.get(), TouchList::create());
             targetTouchesIterator = touchesByTarget.find(touchInfo.touchTarget.get());
         }
 
         // touches and targetTouches should only contain information about
@@ skipping 105 matching lines @@
                 LayoutPoint framePoint = roundedLayoutPoint(m_touchSequenceDocument->frame()->view()->rootFrameToContents(point.pos()));
                 result = hitTestResultInFrame(m_touchSequenceDocument->frame(), framePoint, hitType);
             } else {
                 continue;
             }
 
             Node* node = result.innerNode();
             if (!node)
                 continue;
 
+            if (isHTMLCanvasElement(node)) {
+                std::pair<Element*, String> regionInfo = toHTMLCanvasElement(node)->getControlAndIdIfHitRegionExists(result.pointInInnerNodeFrame());
+                if (regionInfo.first)
+                    node = regionInfo.first;
+                m_regionForTouchID.set(point.id(), regionInfo.second);
+            }
+
             // Touch events should not go to text nodes
             if (node->isTextNode())
                 node = FlatTreeTraversal::parent(*node);
 
             if (!m_touchSequenceDocument) {
                 // Keep track of which document should receive all touch events
                 // in the active sequence. This must be a single document to
                 // ensure we don't leak Nodes between documents.
                 m_touchSequenceDocument = &(result.innerNode()->document());
                 ASSERT(m_touchSequenceDocument->frame()->view());
@@ skipping 26 matching lines @@
         return WebInputEventResult::NotHandled;
     }
 
     // Compute and store the common info used by both PointerEvent and TouchEvent.
     WillBeHeapVector<TouchInfo> touchInfos(points.size());
 
     for (unsigned i = 0; i < points.size(); ++i) {
         const PlatformTouchPoint& point = points[i];
         PlatformTouchPoint::TouchState pointState = point.state();
         RefPtrWillBeRawPtr<EventTarget> touchTarget = nullptr;
+        String regionID;
 
         if (pointState == PlatformTouchPoint::TouchReleased || pointState == PlatformTouchPoint::TouchCancelled) {
             // The target should be the original target for this touch, so get
             // it from the hashmap. As it's a release or cancel we also remove
             // it from the map.
             touchTarget = m_targetForTouchID.take(point.id());
+            regionID = m_regionForTouchID.take(point.id());
         } else {
             // No hittest is performed on move or stationary, since the target
             // is not allowed to change anyway.
             touchTarget = m_targetForTouchID.get(point.id());
+            regionID = m_regionForTouchID.get(point.id());
         }
 
         LocalFrame* targetFrame = nullptr;
         bool knownTarget = false;
         if (touchTarget) {
             Document& doc = touchTarget->toNode()->document();
             // If the target node has moved to a new document while it was being touched,
             // we can't send events to the new document because that could leak nodes
             // from one document to another. See http://crbug.com/394339.
             if (&doc == m_touchSequenceDocument.get()) {
@@ skipping 25 matching lines @@
         float scaleFactor = 1.0f / targetFrame->pageZoomFactor();
 
         TouchInfo& touchInfo = touchInfos[i];
         touchInfo.point = point;
         touchInfo.touchTarget = touchTarget;
         touchInfo.targetFrame = targetFrame;
         touchInfo.adjustedPagePoint = pagePoint.scaledBy(scaleFactor);
         touchInfo.adjustedRadius = point.radius().scaledBy(scaleFactor);
         touchInfo.knownTarget = knownTarget;
         touchInfo.consumed = false;
+        touchInfo.region = regionID;
     }
 
     if (!m_inPointerCanceledState) {
         dispatchPointerEvents(event, touchInfos);
         // Note that the disposition of any pointer events affects only the generation of touch
         // events. If all pointer events were handled (and hence no touch events were fired), that
         // is still equivalent to the touch events going unhandled because pointer event handler
         // don't block scroll gesture generation.
     }
 
@@ skipping 68 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