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#include "config.h" 32#include "ScopedEventQueue.h" 33 34#include "Event.h" 35#include "EventDispatcher.h" 36#include "EventTarget.h" 37 38namespace WebCore { 39 40ScopedEventQueue::ScopedEventQueue() 41 : m_scopingLevel(0) 42{ 43} 44 45ScopedEventQueue::~ScopedEventQueue() 46{ 47 ASSERT(!m_scopingLevel); 48 ASSERT(!m_queuedEvents.size()); 49} 50 51ScopedEventQueue& ScopedEventQueue::instance() 52{ 53 static NeverDestroyed<ScopedEventQueue> scopedEventQueue; 54 return scopedEventQueue; 55} 56 57void ScopedEventQueue::enqueueEvent(PassRefPtr<Event> event) 58{ 59 if (m_scopingLevel) 60 m_queuedEvents.append(event); 61 else 62 dispatchEvent(event); 63} 64 65void ScopedEventQueue::dispatchEvent(PassRefPtr<Event> event) const 66{ 67 ASSERT(event->target()); 68 // Store the target in a local variable to avoid possibly dereferencing a nullified PassRefPtr after it's passed on. 69 Node* node = event->target()->toNode(); 70 EventDispatcher::dispatchEvent(node, event); 71} 72 73void ScopedEventQueue::dispatchAllEvents() 74{ 75 Vector<RefPtr<Event>> queuedEvents = WTF::move(m_queuedEvents); 76 for (size_t i = 0; i < queuedEvents.size(); i++) 77 dispatchEvent(queuedEvents[i].release()); 78} 79 80void ScopedEventQueue::incrementScopingLevel() 81{ 82 m_scopingLevel++; 83} 84 85void ScopedEventQueue::decrementScopingLevel() 86{ 87 ASSERT(m_scopingLevel); 88 m_scopingLevel--; 89 if (!m_scopingLevel) 90 dispatchAllEvents(); 91} 92 93} 94