DocumentEventQueue.cpp [plain text]
#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"
namespace WebCore {
static inline bool shouldDispatchScrollEventSynchronously(Document* document)
{
ASSERT_ARG(document, document);
return applicationIsSafari() && (document->url().protocolIs("feed") || document->url().protocolIs("feeds"));
}
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);
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;
bool canBubble = targetType == ScrollEventDocumentTarget;
RefPtr<Event> scrollEvent = Event::create(eventNames().scrollEvent, canBubble, false );
if (shouldDispatchScrollEventSynchronously(target->document())) {
target->dispatchEvent(scrollEvent.release());
return;
}
if (!m_nodesWithQueuedScrollEvents.add(target.get()).isNewEntry)
return;
scrollEvent->setTarget(target);
enqueueEvent(scrollEvent.release());
}
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();
ASSERT(!m_queuedEvents.contains(0));
bool wasAdded = m_queuedEvents.add(0).isNewEntry;
ASSERT_UNUSED(wasAdded, wasAdded);
RefPtr<DocumentEventQueue> protector(this);
while (!m_queuedEvents.isEmpty()) {
ListHashSet<RefPtr<Event> >::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);
}
}