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      1 /*
      2  * Copyright (C) 2010 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  *
     25  */
     26 
     27 #ifndef EventQueue_h
     28 #define EventQueue_h
     29 
     30 #include <wtf/HashSet.h>
     31 #include <wtf/ListHashSet.h>
     32 #include <wtf/OwnPtr.h>
     33 #include <wtf/RefCounted.h>
     34 #include <wtf/RefPtr.h>
     35 
     36 namespace WebCore {
     37 
     38 class Event;
     39 class EventQueueTimer;
     40 class Node;
     41 class ScriptExecutionContext;
     42 
     43 class EventQueue : public RefCounted<EventQueue> {
     44 public:
     45     enum ScrollEventTargetType {
     46         ScrollEventDocumentTarget,
     47         ScrollEventElementTarget
     48     };
     49 
     50     static PassRefPtr<EventQueue> create(ScriptExecutionContext*);
     51     ~EventQueue();
     52 
     53     void enqueueEvent(PassRefPtr<Event>);
     54     void enqueueOrDispatchScrollEvent(PassRefPtr<Node>, ScrollEventTargetType);
     55     bool cancelEvent(Event*);
     56     void cancelQueuedEvents();
     57 
     58 private:
     59     explicit EventQueue(ScriptExecutionContext*);
     60 
     61     void pendingEventTimerFired();
     62     void dispatchEvent(PassRefPtr<Event>);
     63 
     64     OwnPtr<EventQueueTimer> m_pendingEventTimer;
     65     ListHashSet<RefPtr<Event> > m_queuedEvents;
     66     HashSet<Node*> m_nodesWithQueuedScrollEvents;
     67 
     68     friend class EventQueueTimer;
     69 };
     70 
     71 }
     72 
     73 #endif // EventQueue_h
     74