115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
/*
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* Copyright (C) 2012 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "Timer.h"
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#include <wtf/Vector.h>
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#include <wtf/WeakPtr.h>
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namespace WebCore {
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class Page;
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template<typename T> class EventSender {
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WTF_MAKE_NONCOPYABLE(EventSender); WTF_MAKE_FAST_ALLOCATED;
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public:
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explicit EventSender(const AtomString& eventType);
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const AtomString& eventType() const { return m_eventType; }
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void dispatchEventSoon(T&);
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void cancelEvent(T&);
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void dispatchPendingEvents(Page*);
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#if ASSERT_ENABLED
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bool hasPendingEvents(T& sender) const
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{
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return m_dispatchSoonList.find(&sender) != notFound || m_dispatchingList.find(&sender) != notFound;
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}
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#endif
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private:
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void timerFired() { dispatchPendingEvents(nullptr); }
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AtomString m_eventType;
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Timer m_timer;
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Vector<WeakPtr<T>> m_dispatchSoonList;
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Vector<WeakPtr<T>> m_dispatchingList;
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};
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template<typename T> EventSender<T>::EventSender(const AtomString& eventType)
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: m_eventType(eventType)
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, m_timer(*this, &EventSender::timerFired)
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{
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}
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template<typename T> void EventSender<T>::dispatchEventSoon(T& sender)
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{
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m_dispatchSoonList.append(makeWeakPtr(sender));
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if (!m_timer.isActive())
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m_timer.startOneShot(0_s);
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}
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template<typename T> void EventSender<T>::cancelEvent(T& sender)
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{
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// Remove instances of this sender from both lists.
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// Use loops because we allow multiple instances to get into the lists.
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for (auto& event : m_dispatchSoonList) {
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if (event == &sender)
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event = nullptr;
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}
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for (auto& event : m_dispatchingList) {
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if (event == &sender)
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event = nullptr;
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}
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}
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template<typename T> void EventSender<T>::dispatchPendingEvents(Page* page)
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{
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// Need to avoid re-entering this function; if new dispatches are
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// scheduled before the parent finishes processing the list, they
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// will set a timer and eventually be processed.
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if (!m_dispatchingList.isEmpty())
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return;
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m_timer.stop();
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m_dispatchSoonList.checkConsistency();
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m_dispatchingList = std::exchange(m_dispatchSoonList, { });
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for (auto& event : m_dispatchingList) {
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if (auto sender = event.get()) {
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event = nullptr;
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if (!page || sender->document().page() == page)
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sender->dispatchPendingEvent(this);
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else
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dispatchEventSoon(*sender);
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}
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}
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m_dispatchingList.clear();
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}
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} // namespace WebCore
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