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/*
* Copyright (C) 2012 Apple 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
*/
#pragma once
#include "Timer.h"
#include <wtf/Vector.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class Page;
class WeakPtrImplWithEventTargetData;
template<typename T, typename WeakPtrImpl> class EventSender {
WTF_MAKE_NONCOPYABLE(EventSender); WTF_MAKE_FAST_ALLOCATED;
public:
EventSender();
void dispatchEventSoon(T&, const AtomString& eventType);
void cancelEvent(T&);
void cancelEvent(T&, const AtomString& eventType);
void dispatchPendingEvents(Page*);
#if ASSERT_ENABLED
bool hasPendingEvents(T& sender) const
{
return m_dispatchSoonList.containsIf([&](auto& task) { return task.sender == &sender; })
|| m_dispatchingList.containsIf([&](auto& task) { return task.sender == &sender; });
}
#endif
private:
void timerFired() { dispatchPendingEvents(nullptr); }
Timer m_timer;
struct DispatchTask {
WeakPtr<T, WeakPtrImpl> sender;
AtomString eventType;
};
Vector<DispatchTask> m_dispatchSoonList;
Vector<DispatchTask> m_dispatchingList;
};
template<typename T, typename WeakPtrImpl> EventSender<T, WeakPtrImpl>::EventSender()
: m_timer(*this, &EventSender::timerFired)
{
}
template<typename T, typename WeakPtrImpl> void EventSender<T, WeakPtrImpl>::dispatchEventSoon(T& sender, const AtomString& eventType)
{
m_dispatchSoonList.append(DispatchTask { sender, eventType });
if (!m_timer.isActive())
m_timer.startOneShot(0_s);
}
template<typename T, typename WeakPtrImpl> void EventSender<T, WeakPtrImpl>::cancelEvent(T& senderToCancel)
{
// Remove instances of this sender from both lists.
// Use loops because we allow multiple instances to get into the lists.
for (auto& [sender, eventType] : m_dispatchSoonList) {
if (sender == &senderToCancel)
sender = nullptr;
}
for (auto& [sender, eventType] : m_dispatchingList) {
if (sender == &senderToCancel)
sender = nullptr;
}
}
template<typename T, typename WeakPtrImpl> void EventSender<T, WeakPtrImpl>::cancelEvent(T& senderToCancel, const AtomString& eventTypeToCancel)
{
// Remove instances of this sender from both lists.
// Use loops because we allow multiple instances to get into the lists.
for (auto& [sender, eventType] : m_dispatchSoonList) {
if (sender == &senderToCancel && eventType == eventTypeToCancel)
sender = nullptr;
}
for (auto& [sender, eventType] : m_dispatchingList) {
if (sender == &senderToCancel && eventType == eventTypeToCancel)
sender = nullptr;
}
}
template<typename T, typename WeakPtrImpl> void EventSender<T, WeakPtrImpl>::dispatchPendingEvents(Page* page)
{
// Need to avoid re-entering this function; if new dispatches are
// scheduled before the parent finishes processing the list, they
// will set a timer and eventually be processed.
if (!m_dispatchingList.isEmpty())
return;
m_timer.stop();
m_dispatchSoonList.checkConsistency();
m_dispatchingList = std::exchange(m_dispatchSoonList, { });
for (auto& [weakSender, eventType] : m_dispatchingList) {
if (!weakSender)
continue;
auto sender = std::exchange(weakSender, nullptr);
if (!page || sender->document().page() == page)
sender->dispatchPendingEvent(this, eventType);
else
dispatchEventSoon(*sender, eventType);
}
m_dispatchingList.clear();
}
} // namespace WebCore
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