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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef EventPath_h
#define EventPath_h
#include "core/CoreExport.h"
#include "core/events/NodeEventContext.h"
#include "core/events/TreeScopeEventContext.h"
#include "core/events/WindowEventContext.h"
#include "platform/heap/Handle.h"
#include "wtf/HashMap.h"
#include "wtf/Vector.h"
namespace blink {
class Event;
class EventTarget;
class Node;
class TouchEvent;
class TouchList;
class TreeScope;
class CORE_EXPORT EventPath final : public GarbageCollected<EventPath> {
WTF_MAKE_NONCOPYABLE(EventPath);
public:
explicit EventPath(Node&, Event* = nullptr);
void initializeWith(Node&, Event*);
const HeapVector<NodeEventContext>& nodeEventContexts() const {
return m_nodeEventContexts;
}
HeapVector<NodeEventContext>& nodeEventContexts() {
return m_nodeEventContexts;
}
NodeEventContext& operator[](size_t index) {
return m_nodeEventContexts[index];
}
const NodeEventContext& operator[](size_t index) const {
return m_nodeEventContexts[index];
}
NodeEventContext& at(size_t index) { return m_nodeEventContexts[index]; }
NodeEventContext& last() { return m_nodeEventContexts[size() - 1]; }
WindowEventContext& windowEventContext() {
DCHECK(m_windowEventContext);
return *m_windowEventContext;
}
void ensureWindowEventContext();
bool isEmpty() const { return m_nodeEventContexts.isEmpty(); }
size_t size() const { return m_nodeEventContexts.size(); }
void adjustForRelatedTarget(Node&, EventTarget* relatedTarget);
void adjustForTouchEvent(TouchEvent&);
NodeEventContext& topNodeEventContext();
static EventTarget* eventTargetRespectingTargetRules(Node&);
DECLARE_TRACE();
void clear() {
m_nodeEventContexts.clear();
m_treeScopeEventContexts.clear();
}
private:
EventPath();
void initialize();
void calculatePath();
void calculateAdjustedTargets();
void calculateTreeOrderAndSetNearestAncestorClosedTree();
bool shouldStopEventPath(EventTarget& currentTarget,
EventTarget& currentRelatedTarget,
const Node& target);
void shrink(size_t newSize) {
DCHECK(!m_windowEventContext);
m_nodeEventContexts.shrink(newSize);
}
void retargetRelatedTarget(const Node& relatedTargetNode);
void shrinkForRelatedTarget(const Node& target);
void adjustTouchList(const TouchList*,
HeapVector<Member<TouchList>> adjustedTouchList,
const HeapVector<Member<TreeScope>>& treeScopes);
using TreeScopeEventContextMap =
HeapHashMap<Member<TreeScope>, Member<TreeScopeEventContext>>;
TreeScopeEventContext* ensureTreeScopeEventContext(Node* currentTarget,
TreeScope*,
TreeScopeEventContextMap&);
using RelatedTargetMap = HeapHashMap<Member<TreeScope>, Member<EventTarget>>;
static void buildRelatedNodeMap(const Node&, RelatedTargetMap&);
static EventTarget* findRelatedNode(TreeScope&, RelatedTargetMap&);
#if DCHECK_IS_ON()
static void checkReachability(TreeScope&, TouchList&);
#endif
HeapVector<NodeEventContext> m_nodeEventContexts;
Member<Node> m_node;
Member<Event> m_event;
HeapVector<Member<TreeScopeEventContext>> m_treeScopeEventContexts;
Member<WindowEventContext> m_windowEventContext;
};
} // namespace blink
#endif
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