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
40namespace blink {
41
42ScopedEventQueue* ScopedEventQueue::s_instance = 0;
43
44ScopedEventQueue::ScopedEventQueue()
45    : m_scopingLevel(0)
46{
47}
48
49ScopedEventQueue::~ScopedEventQueue()
50{
51    ASSERT(!m_scopingLevel);
52    ASSERT(!m_queuedEventDispatchMediators.size());
53}
54
55void ScopedEventQueue::initialize()
56{
57    ASSERT(!s_instance);
58    OwnPtr<ScopedEventQueue> instance = adoptPtr(new ScopedEventQueue);
59    s_instance = instance.leakPtr();
60}
61
62void ScopedEventQueue::enqueueEventDispatchMediator(PassRefPtrWillBeRawPtr<EventDispatchMediator> mediator)
63{
64    if (m_scopingLevel)
65        m_queuedEventDispatchMediators.append(mediator);
66    else
67        dispatchEvent(mediator);
68}
69
70void 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
79void 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
86ScopedEventQueue* ScopedEventQueue::instance()
87{
88    if (!s_instance)
89        initialize();
90
91    return s_instance;
92}
93
94void ScopedEventQueue::incrementScopingLevel()
95{
96    m_scopingLevel++;
97}
98
99void ScopedEventQueue::decrementScopingLevel()
100{
101    ASSERT(m_scopingLevel);
102    m_scopingLevel--;
103    if (!m_scopingLevel)
104        dispatchAllEvents();
105}
106
107}
108