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/*
* Copyright (C) 2010 Google Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "config.h"
#include "DocumentEventQueue.h"
#include "DOMWindow.h"
#include "Document.h"
#include "Event.h"
#include "EventNames.h"
#include "RuntimeApplicationChecks.h"
#include "ScriptExecutionContext.h"
#include "SuspendableTimer.h"
#include "WebCoreMemoryInstrumentation.h"
#include <wtf/MemoryInstrumentationHashSet.h>
#include <wtf/MemoryInstrumentationListHashSet.h>
namespace WebCore {
class DocumentEventQueueTimer : public SuspendableTimer {
WTF_MAKE_NONCOPYABLE(DocumentEventQueueTimer);
public:
DocumentEventQueueTimer(DocumentEventQueue* eventQueue, ScriptExecutionContext* context)
: SuspendableTimer(context)
, m_eventQueue(eventQueue) { }
private:
virtual void fired() { m_eventQueue->pendingEventTimerFired(); }
DocumentEventQueue* m_eventQueue;
};
PassRefPtr<DocumentEventQueue> DocumentEventQueue::create(ScriptExecutionContext* context)
{
return adoptRef(new DocumentEventQueue(context));
}
DocumentEventQueue::DocumentEventQueue(ScriptExecutionContext* context)
: m_pendingEventTimer(adoptPtr(new DocumentEventQueueTimer(this, context)))
, m_isClosed(false)
{
m_pendingEventTimer->suspendIfNeeded();
}
DocumentEventQueue::~DocumentEventQueue()
{
}
bool DocumentEventQueue::enqueueEvent(PassRefPtr<Event> event)
{
if (m_isClosed)
return false;
ASSERT(event->target());
bool wasAdded = m_queuedEvents.add(event).isNewEntry;
ASSERT_UNUSED(wasAdded, wasAdded); // It should not have already been in the list.
if (!m_pendingEventTimer->isActive())
m_pendingEventTimer->startOneShot(0);
return true;
}
void DocumentEventQueue::enqueueOrDispatchScrollEvent(PassRefPtr<Node> target, ScrollEventTargetType targetType)
{
if (!target->document()->hasListenerType(Document::SCROLL_LISTENER))
return;
// Per the W3C CSSOM View Module, scroll events fired at the document should bubble, others should not.
bool canBubble = targetType == ScrollEventDocumentTarget;
RefPtr<Event> scrollEvent = Event::create(eventNames().scrollEvent, canBubble, false /* non cancelleable */);
if (!m_nodesWithQueuedScrollEvents.add(target.get()).isNewEntry)
return;
scrollEvent->setTarget(target);
enqueueEvent(scrollEvent.release());
}
void DocumentEventQueue::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::DOM);
info.addMember(m_pendingEventTimer);
info.addMember(m_queuedEvents);
info.addMember(m_nodesWithQueuedScrollEvents);
}
bool DocumentEventQueue::cancelEvent(Event* event)
{
bool found = m_queuedEvents.contains(event);
m_queuedEvents.remove(event);
if (m_queuedEvents.isEmpty())
m_pendingEventTimer->stop();
return found;
}
void DocumentEventQueue::close()
{
m_isClosed = true;
m_pendingEventTimer->stop();
m_queuedEvents.clear();
}
void DocumentEventQueue::pendingEventTimerFired()
{
ASSERT(!m_pendingEventTimer->isActive());
ASSERT(!m_queuedEvents.isEmpty());
m_nodesWithQueuedScrollEvents.clear();
// Insert a marker for where we should stop.
ASSERT(!m_queuedEvents.contains(0));
bool wasAdded = m_queuedEvents.add(0).isNewEntry;
ASSERT_UNUSED(wasAdded, wasAdded); // It should not have already been in the list.
RefPtr<DocumentEventQueue> protector(this);
while (!m_queuedEvents.isEmpty()) {
ListHashSet<RefPtr<Event>, 16>::iterator iter = m_queuedEvents.begin();
RefPtr<Event> event = *iter;
m_queuedEvents.remove(iter);
if (!event)
break;
dispatchEvent(event.get());
}
}
void DocumentEventQueue::dispatchEvent(PassRefPtr<Event> event)
{
EventTarget* eventTarget = event->target();
if (eventTarget->toDOMWindow())
eventTarget->toDOMWindow()->dispatchEvent(event, 0);
else
eventTarget->dispatchEvent(event);
}
}
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