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 "EventTarget.h"
36
37 namespace WebCore {
38
39 ScopedEventQueue* ScopedEventQueue::s_instance = 0;
40
ScopedEventQueue()41 ScopedEventQueue::ScopedEventQueue()
42 : m_scopingLevel(0)
43 {
44 }
45
~ScopedEventQueue()46 ScopedEventQueue::~ScopedEventQueue()
47 {
48 ASSERT(!m_scopingLevel);
49 ASSERT(!m_queuedEvents.size());
50 }
51
initialize()52 void ScopedEventQueue::initialize()
53 {
54 ASSERT(!s_instance);
55 OwnPtr<ScopedEventQueue> instance = adoptPtr(new ScopedEventQueue);
56 s_instance = instance.leakPtr();
57 }
58
enqueueEvent(PassRefPtr<Event> event)59 void ScopedEventQueue::enqueueEvent(PassRefPtr<Event> event)
60 {
61 if (m_scopingLevel)
62 m_queuedEvents.append(event);
63 else
64 dispatchEvent(event);
65 }
66
dispatchAllEvents()67 void ScopedEventQueue::dispatchAllEvents()
68 {
69 Vector<RefPtr<Event> > queuedEvents;
70 queuedEvents.swap(m_queuedEvents);
71
72 for (size_t i = 0; i < queuedEvents.size(); i++)
73 dispatchEvent(queuedEvents[i].release());
74 }
75
dispatchEvent(PassRefPtr<Event> event) const76 void ScopedEventQueue::dispatchEvent(PassRefPtr<Event> event) const
77 {
78 RefPtr<EventTarget> eventTarget = event->target();
79 eventTarget->dispatchEvent(event);
80 }
81
instance()82 ScopedEventQueue* ScopedEventQueue::instance()
83 {
84 if (!s_instance)
85 initialize();
86
87 return s_instance;
88 }
89
incrementScopingLevel()90 void ScopedEventQueue::incrementScopingLevel()
91 {
92 m_scopingLevel++;
93 }
94
decrementScopingLevel()95 void ScopedEventQueue::decrementScopingLevel()
96 {
97 ASSERT(m_scopingLevel);
98 m_scopingLevel--;
99 if (!m_scopingLevel)
100 dispatchAllEvents();
101 }
102
103 }
104