1/*
2 * Copyright (C) 2010 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#pragma once
32
33#include <wtf/Forward.h>
34#include <wtf/Noncopyable.h>
35#include <wtf/Ref.h>
36#include <wtf/Vector.h>
37
38namespace WebCore {
39
40class Event;
41class EventQueueScope;
42
43class ScopedEventQueue {
44 WTF_MAKE_NONCOPYABLE(ScopedEventQueue); WTF_MAKE_FAST_ALLOCATED;
45public:
46 static ScopedEventQueue& singleton();
47 void enqueueEvent(Ref<Event>&&);
48
49private:
50 ScopedEventQueue() = default;
51 ~ScopedEventQueue() = delete;
52
53 void dispatchEvent(Event&) const;
54 void dispatchAllEvents();
55 void incrementScopingLevel();
56 void decrementScopingLevel();
57
58 Vector<Ref<Event>> m_queuedEvents;
59 unsigned m_scopingLevel { 0 };
60
61 friend class WTF::NeverDestroyed<WebCore::ScopedEventQueue>;
62 friend class EventQueueScope;
63};
64
65class EventQueueScope {
66 WTF_MAKE_NONCOPYABLE(EventQueueScope);
67public:
68 EventQueueScope() { ScopedEventQueue::singleton().incrementScopingLevel(); }
69 ~EventQueueScope() { ScopedEventQueue::singleton().decrementScopingLevel(); }
70};
71
72} // namespace WebCore
73