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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Neither the name of Google Inc. nor the names of its
     11  * contributors may be used to endorse or promote products derived from
     12  * this software without specific prior written permission.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     17  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     18  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     20  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef EventPath_h
     28 #define EventPath_h
     29 
     30 #include "core/events/NodeEventContext.h"
     31 #include "core/events/TreeScopeEventContext.h"
     32 #include "platform/heap/Handle.h"
     33 #include "wtf/HashMap.h"
     34 #include "wtf/Vector.h"
     35 
     36 namespace WebCore {
     37 
     38 class Event;
     39 class EventTarget;
     40 class Node;
     41 class TouchEvent;
     42 class TouchList;
     43 class TreeScope;
     44 
     45 enum EventDispatchBehavior {
     46     RetargetEvent,
     47     StayInsideShadowDOM
     48 };
     49 
     50 class EventPath : public NoBaseWillBeGarbageCollectedFinalized<EventPath> {
     51 public:
     52     explicit EventPath(Event*);
     53     explicit EventPath(Node*);
     54     void resetWith(Node*);
     55 
     56     NodeEventContext& operator[](size_t index) { return m_nodeEventContexts[index]; }
     57     const NodeEventContext& operator[](size_t index) const { return m_nodeEventContexts[index]; }
     58     const NodeEventContext& last() const { return m_nodeEventContexts[size() - 1]; }
     59 
     60     bool isEmpty() const { return m_nodeEventContexts.isEmpty(); }
     61     size_t size() const { return m_nodeEventContexts.size(); }
     62 
     63     void adjustForRelatedTarget(Node*, EventTarget* relatedTarget);
     64     void adjustForTouchEvent(Node*, TouchEvent&);
     65 
     66     static EventTarget* eventTargetRespectingTargetRules(Node*);
     67 
     68     void trace(Visitor*);
     69 
     70 private:
     71     EventPath();
     72 
     73     NodeEventContext& at(size_t index) { return m_nodeEventContexts[index]; }
     74 
     75     void addNodeEventContext(Node*);
     76 
     77     void calculatePath();
     78     void calculateAdjustedTargets();
     79     void calculateTreeScopePrePostOrderNumbers();
     80 
     81     void shrink(size_t newSize) { m_nodeEventContexts.shrink(newSize); }
     82     void shrinkIfNeeded(const Node* target, const EventTarget* relatedTarget);
     83 
     84     void adjustTouchList(const Node*, const TouchList*, WillBeHeapVector<RawPtrWillBeMember<TouchList> > adjustedTouchList, const WillBeHeapVector<RawPtrWillBeMember<TreeScope> >& treeScopes);
     85 
     86     typedef WillBeHeapHashMap<RawPtrWillBeMember<TreeScope>, RefPtrWillBeMember<TreeScopeEventContext> > TreeScopeEventContextMap;
     87     TreeScopeEventContext* ensureTreeScopeEventContext(Node* currentTarget, TreeScope*, TreeScopeEventContextMap&);
     88 
     89     typedef WillBeHeapHashMap<RawPtrWillBeMember<TreeScope>, RawPtrWillBeMember<EventTarget> > RelatedTargetMap;
     90 
     91     static void buildRelatedNodeMap(const Node*, RelatedTargetMap&);
     92     static EventTarget* findRelatedNode(TreeScope*, RelatedTargetMap&);
     93 
     94 #ifndef NDEBUG
     95     static void checkReachability(TreeScope&, TouchList&);
     96 #endif
     97 
     98     WillBeHeapVector<NodeEventContext, 64> m_nodeEventContexts;
     99     RawPtrWillBeMember<Node> m_node;
    100     RawPtrWillBeMember<Event> m_event;
    101     WillBeHeapVector<RefPtrWillBeMember<TreeScopeEventContext> > m_treeScopeEventContexts;
    102 };
    103 
    104 } // namespace
    105 
    106 #endif
    107