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/*
* Copyright (C) 2010 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "GCReachableRef.h"
#include <wtf/Forward.h>
#include <wtf/Noncopyable.h>
#include <wtf/Ref.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
namespace WebCore {
class Event;
class EventQueueScope;
class ScopedEventQueue {
WTF_MAKE_TZONE_ALLOCATED(ScopedEventQueue);
WTF_MAKE_NONCOPYABLE(ScopedEventQueue);
public:
static ScopedEventQueue& singleton();
struct ScopedEvent {
Ref<Event> event;
GCReachableRef<Node> target;
};
void enqueueEvent(ScopedEvent&&);
private:
ScopedEventQueue() = default;
~ScopedEventQueue() = delete;
void dispatchEvent(const ScopedEvent&) const;
void dispatchAllEvents();
void incrementScopingLevel() { ++m_scopingLevel; }
void decrementScopingLevel();
Vector<ScopedEvent> m_queuedEvents;
unsigned m_scopingLevel { 0 };
friend class WTF::NeverDestroyed<WebCore::ScopedEventQueue>;
friend class EventQueueScope;
};
class EventQueueScope {
WTF_MAKE_NONCOPYABLE(EventQueueScope);
public:
EventQueueScope() { ScopedEventQueue::singleton().incrementScopingLevel(); }
~EventQueueScope() { ScopedEventQueue::singleton().decrementScopingLevel(); }
};
} // namespace WebCore
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