GenericEventQueue.cpp [plain text]
#include "config.h"
#include "GenericEventQueue.h"
#include "Document.h"
#include "Event.h"
#include "EventTarget.h"
#include "Node.h"
#include "ScriptExecutionContext.h"
#include "Timer.h"
#include <wtf/MainThread.h>
#include <wtf/SetForScope.h>
namespace WebCore {
MainThreadGenericEventQueue::MainThreadGenericEventQueue(EventTarget& owner)
: ActiveDOMObject(owner.scriptExecutionContext())
, m_owner(owner)
, m_taskQueue(makeUniqueRef<GenericTaskQueue<Timer>>())
{
}
void MainThreadGenericEventQueue::enqueueEvent(RefPtr<Event>&& event)
{
if (m_isClosed)
return;
if (event->target() == &m_owner)
event->setTarget(nullptr);
m_pendingEvents.append(WTFMove(event));
if (isSuspendedOrPausedByClient())
return;
m_taskQueue->enqueueTask(std::bind(&MainThreadGenericEventQueue::dispatchOneEvent, this));
}
void MainThreadGenericEventQueue::dispatchOneEvent()
{
ASSERT(!m_pendingEvents.isEmpty());
Ref<EventTarget> protect(m_owner);
SetForScope<bool> eventFiringScope(m_isFiringEvent, true);
RefPtr<Event> event = m_pendingEvents.takeFirst();
Ref<EventTarget> target = event->target() ? *event->target() : m_owner;
ASSERT_WITH_MESSAGE(!target->scriptExecutionContext()->activeDOMObjectsAreStopped(),
"An attempt to dispatch an event on a stopped target by EventTargetInterface=%d (nodeName=%s target=%p owner=%p)",
m_owner.eventTargetInterface(), m_owner.isNode() ? static_cast<Node&>(m_owner).nodeName().ascii().data() : "", target.ptr(), &m_owner);
target->dispatchEvent(*event);
}
void MainThreadGenericEventQueue::close()
{
m_isClosed = true;
m_taskQueue->close();
m_pendingEvents.clear();
}
void MainThreadGenericEventQueue::cancelAllEvents()
{
m_taskQueue->cancelAllTasks();
m_pendingEvents.clear();
}
bool MainThreadGenericEventQueue::hasPendingActivity() const
{
return !m_pendingEvents.isEmpty() || m_isFiringEvent;
}
bool MainThreadGenericEventQueue::hasPendingEventsOfType(const AtomString& type) const
{
for (auto& event : m_pendingEvents) {
if (event->type() == type)
return true;
}
return false;
}
void MainThreadGenericEventQueue::setPaused(bool shouldPause)
{
if (m_isPausedByClient == shouldPause)
return;
m_isPausedByClient = shouldPause;
if (shouldPause)
m_taskQueue->cancelAllTasks();
else
rescheduleAllEventsIfNeeded();
}
void MainThreadGenericEventQueue::suspend(ReasonForSuspension)
{
if (m_isSuspended)
return;
m_isSuspended = true;
m_taskQueue->cancelAllTasks();
}
void MainThreadGenericEventQueue::resume()
{
if (!m_isSuspended)
return;
m_isSuspended = false;
rescheduleAllEventsIfNeeded();
}
void MainThreadGenericEventQueue::rescheduleAllEventsIfNeeded()
{
if (isSuspendedOrPausedByClient())
return;
for (unsigned i = 0; i < m_pendingEvents.size(); ++i)
m_taskQueue->enqueueTask(std::bind(&MainThreadGenericEventQueue::dispatchOneEvent, this));
}
void MainThreadGenericEventQueue::stop()
{
close();
}
const char* MainThreadGenericEventQueue::activeDOMObjectName() const
{
return "MainThreadGenericEventQueue";
}
UniqueRef<MainThreadGenericEventQueue> MainThreadGenericEventQueue::create(EventTarget& eventTarget)
{
auto eventQueue = makeUniqueRef<MainThreadGenericEventQueue>(eventTarget);
eventQueue->suspendIfNeeded();
return eventQueue;
}
}