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 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 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#ifndef ScopedEventQueue_h 32#define ScopedEventQueue_h 33 34#include <wtf/NeverDestroyed.h> 35#include <wtf/Noncopyable.h> 36#include <wtf/PassRefPtr.h> 37#include <wtf/RefPtr.h> 38#include <wtf/Vector.h> 39 40namespace WebCore { 41 42class Event; 43class EventQueueScope; 44 45class ScopedEventQueue { 46 WTF_MAKE_NONCOPYABLE(ScopedEventQueue); WTF_MAKE_FAST_ALLOCATED; 47public: 48 static ScopedEventQueue& instance(); 49 void enqueueEvent(PassRefPtr<Event>); 50 51private: 52 ScopedEventQueue(); 53 ~ScopedEventQueue(); 54 55 void dispatchEvent(PassRefPtr<Event>) const; 56 void dispatchAllEvents(); 57 void incrementScopingLevel(); 58 void decrementScopingLevel(); 59 60 Vector<RefPtr<Event>> m_queuedEvents; 61 unsigned m_scopingLevel; 62 63 friend class WTF::NeverDestroyed<WebCore::ScopedEventQueue>; 64 friend class EventQueueScope; 65}; 66 67class EventQueueScope { 68 WTF_MAKE_NONCOPYABLE(EventQueueScope); 69public: 70 EventQueueScope() { ScopedEventQueue::instance().incrementScopingLevel(); } 71 ~EventQueueScope() { ScopedEventQueue::instance().decrementScopingLevel(); } 72}; 73 74} 75 76#endif // ScopedEventQueue_h 77