GenericEventQueue.cpp [plain text]
#include "config.h"
#include "GenericEventQueue.h"
#include "Event.h"
#include "EventTarget.h"
#include "ScriptExecutionContext.h"
#include "Timer.h"
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
GenericEventQueue::GenericEventQueue(EventTarget& owner)
: m_owner(owner)
, m_isClosed(false)
{
}
GenericEventQueue::~GenericEventQueue()
{
}
void GenericEventQueue::enqueueEvent(RefPtr<Event>&& event)
{
if (m_isClosed)
return;
if (event->target() == &m_owner)
event->setTarget(nullptr);
m_pendingEvents.append(WTFMove(event));
if (m_isSuspended)
return;
m_taskQueue.enqueueTask(std::bind(&GenericEventQueue::dispatchOneEvent, this));
}
void GenericEventQueue::dispatchOneEvent()
{
ASSERT(!m_pendingEvents.isEmpty());
Ref<EventTarget> protect(m_owner);
RefPtr<Event> event = m_pendingEvents.takeFirst();
EventTarget& target = event->target() ? *event->target() : m_owner;
target.dispatchEvent(*event);
}
void GenericEventQueue::close()
{
m_isClosed = true;
m_taskQueue.close();
m_pendingEvents.clear();
}
void GenericEventQueue::cancelAllEvents()
{
m_taskQueue.cancelAllTasks();
m_pendingEvents.clear();
}
bool GenericEventQueue::hasPendingEvents() const
{
return !m_pendingEvents.isEmpty();
}
void GenericEventQueue::suspend()
{
ASSERT(!m_isSuspended);
m_isSuspended = true;
m_taskQueue.cancelAllTasks();
}
void GenericEventQueue::resume()
{
if (!m_isSuspended)
return;
m_isSuspended = false;
if (m_pendingEvents.isEmpty())
return;
for (unsigned i = 0; i < m_pendingEvents.size(); ++i)
m_taskQueue.enqueueTask(std::bind(&GenericEventQueue::dispatchOneEvent, this));
}
}