Introduce TreeScopeEventContext

Source/core/events/EventRetargeter.cpp

-/*
- * Copyright (C) 2013 Google Inc. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#include "config.h"
-#include "core/events/EventRetargeter.h"
-
-#include "RuntimeEnabledFeatures.h"
-#include "core/dom/ContainerNode.h"
-#include "core/dom/FullscreenElementStack.h"
-#include "core/dom/Touch.h"
-#include "core/dom/TouchList.h"
-#include "core/dom/TreeScope.h"
-#include "core/dom/shadow/InsertionPoint.h"
-#include "core/dom/shadow/ShadowRoot.h"
-#include "core/events/EventContext.h"
-#include "core/events/EventPath.h"
-#include "core/events/FocusEvent.h"
-#include "core/events/MouseEvent.h"
-#include "core/events/TouchEvent.h"
-#include "wtf/PassRefPtr.h"
-
-namespace WebCore {
-
-void EventRetargeter::adjustForMouseEvent(Node* node, MouseEvent& mouseEvent)
-{
-    adjustForRelatedTarget(node, mouseEvent.relatedTarget(), mouseEvent.eventPath());
-}
-
-void EventRetargeter::adjustForFocusEvent(Node* node, FocusEvent& focusEvent)
-{
-    adjustForRelatedTarget(node, focusEvent.relatedTarget(), focusEvent.eventPath());
-}
-
-void EventRetargeter::adjustForTouchEvent(Node* node, TouchEvent& touchEvent)
-{
-    EventPath& eventPath = touchEvent.eventPath();
-    size_t eventPathSize = eventPath.size();
-
-    EventPathTouchLists eventPathTouches(eventPathSize);
-    EventPathTouchLists eventPathTargetTouches(eventPathSize);
-    EventPathTouchLists eventPathChangedTouches(eventPathSize);
-
-    for (size_t i = 0; i < eventPathSize; ++i) {
-        TouchEventContext* touchEventContext = eventPath[i].ensureTouchEventContext();
-        eventPathTouches[i] = touchEventContext->touches();
-        eventPathTargetTouches[i] = touchEventContext->targetTouches();
-        eventPathChangedTouches[i] = touchEventContext->changedTouches();
-    }
-
-    adjustTouchList(node, touchEvent.touches(), eventPath, eventPathTouches);
-    adjustTouchList(node, touchEvent.targetTouches(), eventPath, eventPathTargetTouches);
-    adjustTouchList(node, touchEvent.changedTouches(), eventPath, eventPathChangedTouches);
-
-#ifndef NDEBUG
-    for (size_t i = 0; i < eventPathSize; ++i) {
-        checkReachability(node, eventPath[i].touchEventContext()->touches());
-        checkReachability(node, eventPath[i].touchEventContext()->targetTouches());
-        checkReachability(node, eventPath[i].touchEventContext()->changedTouches());
-    }
-#endif
-}
-
-#ifndef NDEBUG
-void EventRetargeter::checkReachability(Node* node, TouchList* touchList)
-{
-    for (size_t i = 0; i < touchList->length(); ++i)
-        ASSERT(touchList->item(i)->target()->toNode()->treeScope().isInclusiveAncestorOf(node->treeScope()));
-}
-#endif
-
-void EventRetargeter::adjustTouchList(const Node* node, const TouchList* touchList, const EventPath& eventPath, EventPathTouchLists& eventPathTouchLists)
-{
-    if (!touchList)
-        return;
-    size_t eventPathSize = eventPath.size();
-    ASSERT(eventPathTouchLists.size() == eventPathSize);
-    for (size_t i = 0; i < touchList->length(); ++i) {
-        const Touch& touch = *touchList->item(i);
-        AdjustedTargets adjustedNodes;
-        calculateAdjustedNodes(node, touch.target()->toNode(), DoesNotStopAtBoundary, const_cast<EventPath&>(eventPath), adjustedNodes);
-        ASSERT(adjustedNodes.size() == eventPathSize);
-        for (size_t j = 0; j < eventPathSize; ++j)
-            eventPathTouchLists[j]->append(touch.cloneWithNewTarget(adjustedNodes[j].get()));
-    }
-}
-
-void EventRetargeter::adjustForRelatedTarget(const Node* node, EventTarget* relatedTarget, EventPath& eventPath)
-{
-    if (!node)
-        return;
-    if (!relatedTarget)
-        return;
-    Node* relatedNode = relatedTarget->toNode();
-    if (!relatedNode)
-        return;
-    AdjustedTargets adjustedNodes;
-    calculateAdjustedNodes(node, relatedNode, StopAtBoundaryIfNeeded, eventPath, adjustedNodes);
-    ASSERT(adjustedNodes.size() <= eventPath.size());
-    for (size_t i = 0; i < adjustedNodes.size(); ++i) {
-        eventPath[i].setRelatedTarget(adjustedNodes[i]);
-    }
-}
-
-void EventRetargeter::calculateAdjustedNodes(const Node* node, const Node* relatedNode, EventWithRelatedTargetDispatchBehavior eventWithRelatedTargetDispatchBehavior, EventPath& eventPath, AdjustedTargets& adjustedTargets)
-{
-    RelatedTargetMap relatedNodeMap;
-    buildRelatedNodeMap(relatedNode, relatedNodeMap);
-
-    // Synthetic mouse events can have a relatedTarget which is identical to the target.
-    bool targetIsIdenticalToToRelatedTarget = (node == relatedNode);
-
-    TreeScope* lastTreeScope = 0;
-    EventTarget* adjustedTarget = 0;
-
-    for (size_t i = 0; i < eventPath.size(); ++i) {
-        TreeScope* scope = &eventPath[i].node()->treeScope();
-        if (scope == lastTreeScope) {
-            // Re-use the previous adjustedRelatedTarget if treeScope does not change. Just for the performance optimization.
-            adjustedTargets.append(adjustedTarget);
-        } else {
-            adjustedTarget = findRelatedNode(scope, relatedNodeMap);
-            adjustedTargets.append(adjustedTarget);
-        }
-        lastTreeScope = scope;
-        if (eventWithRelatedTargetDispatchBehavior == DoesNotStopAtBoundary)
-            continue;
-        if (targetIsIdenticalToToRelatedTarget) {
-            if (node->treeScope().rootNode() == eventPath[i].node()) {
-                eventPath.shrink(i + 1);
-                break;
-            }
-        } else if (eventPath[i].target() == adjustedTarget) {
-            // Event dispatching should be stopped here.
-            eventPath.shrink(i);
-            adjustedTargets.shrink(adjustedTargets.size() - 1);
-            break;
-        }
-    }
-}
-
-void EventRetargeter::buildRelatedNodeMap(const Node* relatedNode, RelatedTargetMap& relatedTargetMap)
-{
-    TreeScope* lastTreeScope = 0;
-    EventPath eventPath(const_cast<Node*>(relatedNode));
-    for (size_t i = 0; i < eventPath.size(); ++i) {
-        TreeScope* treeScope = &eventPath[i].node()->treeScope();
-        if (treeScope != lastTreeScope)
-            relatedTargetMap.add(treeScope, eventPath[i].target());
-        lastTreeScope = treeScope;
-    }
-}
-
-EventTarget* EventRetargeter::findRelatedNode(TreeScope* scope, RelatedTargetMap& relatedTargetMap)
-{
-    Vector<TreeScope*, 32> parentTreeScopes;
-    EventTarget* relatedNode = 0;
-    while (scope) {
-        parentTreeScopes.append(scope);
-        RelatedTargetMap::const_iterator found = relatedTargetMap.find(scope);
-        if (found != relatedTargetMap.end()) {
-            relatedNode = found->value;
-            break;
-        }
-        scope = scope->parentTreeScope();
-    }
-    for (Vector<TreeScope*, 32>::iterator iter = parentTreeScopes.begin(); iter < parentTreeScopes.end(); ++iter)
-        relatedTargetMap.add(*iter, relatedNode);
-    return relatedNode;
-}
-
-}