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 "core/dom/ScopedEventQueue.h" 33 34 #include "core/dom/Event.h" 35 #include "core/dom/EventDispatchMediator.h" 36 #include "core/dom/EventDispatcher.h" 37 #include "core/dom/EventTarget.h" 38 #include "wtf/OwnPtr.h" 39 #include "wtf/RefPtr.h" 40 41 namespace WebCore { 42 43 ScopedEventQueue* ScopedEventQueue::s_instance = 0; 44 45 ScopedEventQueue::ScopedEventQueue() 46 : m_scopingLevel(0) 47 { 48 } 49 50 ScopedEventQueue::~ScopedEventQueue() 51 { 52 ASSERT(!m_scopingLevel); 53 ASSERT(!m_queuedEventDispatchMediators.size()); 54 } 55 56 void ScopedEventQueue::initialize() 57 { 58 ASSERT(!s_instance); 59 OwnPtr<ScopedEventQueue> instance = adoptPtr(new ScopedEventQueue); 60 s_instance = instance.leakPtr(); 61 } 62 63 void ScopedEventQueue::enqueueEventDispatchMediator(PassRefPtr<EventDispatchMediator> mediator) 64 { 65 if (m_scopingLevel) 66 m_queuedEventDispatchMediators.append(mediator); 67 else 68 dispatchEvent(mediator); 69 } 70 71 void ScopedEventQueue::dispatchAllEvents() 72 { 73 Vector<RefPtr<EventDispatchMediator> > queuedEventDispatchMediators; 74 queuedEventDispatchMediators.swap(m_queuedEventDispatchMediators); 75 76 for (size_t i = 0; i < queuedEventDispatchMediators.size(); i++) 77 dispatchEvent(queuedEventDispatchMediators[i].release()); 78 } 79 80 void ScopedEventQueue::dispatchEvent(PassRefPtr<EventDispatchMediator> mediator) const 81 { 82 ASSERT(mediator->event()->target()); 83 Node* node = mediator->event()->target()->toNode(); 84 EventDispatcher::dispatchEvent(node, mediator); 85 } 86 87 ScopedEventQueue* ScopedEventQueue::instance() 88 { 89 if (!s_instance) 90 initialize(); 91 92 return s_instance; 93 } 94 95 void ScopedEventQueue::incrementScopingLevel() 96 { 97 m_scopingLevel++; 98 } 99 100 void ScopedEventQueue::decrementScopingLevel() 101 { 102 ASSERT(m_scopingLevel); 103 m_scopingLevel--; 104 if (!m_scopingLevel) 105 dispatchAllEvents(); 106 } 107 108 } 109