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