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