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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 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