1/*
2 * Copyright (C) 2012 Victor Carbune (victor@rosedu.org)
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27
28#include "core/events/GenericEventQueue.h"
29
30#include "core/events/Event.h"
31#include "core/inspector/InspectorInstrumentation.h"
32#include "platform/TraceEvent.h"
33
34namespace blink {
35
36PassOwnPtrWillBeRawPtr<GenericEventQueue> GenericEventQueue::create(EventTarget* owner)
37{
38    return adoptPtrWillBeNoop(new GenericEventQueue(owner));
39}
40
41GenericEventQueue::GenericEventQueue(EventTarget* owner)
42    : m_owner(owner)
43    , m_timer(this, &GenericEventQueue::timerFired)
44    , m_isClosed(false)
45{
46}
47
48GenericEventQueue::~GenericEventQueue()
49{
50}
51
52void GenericEventQueue::trace(Visitor* visitor)
53{
54    visitor->trace(m_owner);
55    visitor->trace(m_pendingEvents);
56    EventQueue::trace(visitor);
57}
58
59bool GenericEventQueue::enqueueEvent(PassRefPtrWillBeRawPtr<Event> event)
60{
61    if (m_isClosed)
62        return false;
63
64    if (event->target() == m_owner)
65        event->setTarget(nullptr);
66
67    TRACE_EVENT_ASYNC_BEGIN1("event", "GenericEventQueue:enqueueEvent", event.get(), "type", event->type().ascii());
68    InspectorInstrumentation::didEnqueueEvent(event->target() ? event->target() : m_owner.get(), event.get());
69    m_pendingEvents.append(event);
70
71    if (!m_timer.isActive())
72        m_timer.startOneShot(0, FROM_HERE);
73
74    return true;
75}
76
77bool GenericEventQueue::cancelEvent(Event* event)
78{
79    bool found = m_pendingEvents.contains(event);
80
81    if (found) {
82        InspectorInstrumentation::didRemoveEvent(event->target() ? event->target() : m_owner.get(), event);
83        m_pendingEvents.remove(m_pendingEvents.find(event));
84        TRACE_EVENT_ASYNC_END2("event", "GenericEventQueue:enqueueEvent", event, "type", event->type().ascii(), "status", "cancelled");
85    }
86
87    if (m_pendingEvents.isEmpty())
88        m_timer.stop();
89
90    return found;
91}
92
93void GenericEventQueue::timerFired(Timer<GenericEventQueue>*)
94{
95    ASSERT(!m_timer.isActive());
96    ASSERT(!m_pendingEvents.isEmpty());
97
98    WillBeHeapVector<RefPtrWillBeMember<Event> > pendingEvents;
99    m_pendingEvents.swap(pendingEvents);
100
101    RefPtrWillBeRawPtr<EventTarget> protect(m_owner.get());
102    for (size_t i = 0; i < pendingEvents.size(); ++i) {
103        Event* event = pendingEvents[i].get();
104        EventTarget* target = event->target() ? event->target() : m_owner.get();
105        CString type(event->type().ascii());
106        TRACE_EVENT_ASYNC_STEP_INTO1("event", "GenericEventQueue:enqueueEvent", event, "dispatch", "type", type);
107        target->dispatchEvent(pendingEvents[i]);
108        TRACE_EVENT_ASYNC_END1("event", "GenericEventQueue:enqueueEvent", event, "type", type);
109        InspectorInstrumentation::didRemoveEvent(target, event);
110    }
111}
112
113void GenericEventQueue::close()
114{
115    m_isClosed = true;
116    cancelAllEvents();
117}
118
119void GenericEventQueue::cancelAllEvents()
120{
121    m_timer.stop();
122
123    for (size_t i = 0; i < m_pendingEvents.size(); ++i) {
124        Event* event = m_pendingEvents[i].get();
125        TRACE_EVENT_ASYNC_END2("event", "GenericEventQueue:enqueueEvent", event, "type", event->type().ascii(), "status", "cancelled");
126        InspectorInstrumentation::didRemoveEvent(event->target() ? event->target() : m_owner.get(), event);
127    }
128    m_pendingEvents.clear();
129}
130
131bool GenericEventQueue::hasPendingEvents() const
132{
133    return m_pendingEvents.size();
134}
135
136}
137