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 | |
38 | namespace WebCore { |
39 | |
40 | class Event; |
41 | class EventQueueScope; |
42 | |
43 | class ScopedEventQueue { |
44 | WTF_MAKE_NONCOPYABLE(ScopedEventQueue); WTF_MAKE_FAST_ALLOCATED; |
45 | public: |
46 | static ScopedEventQueue& singleton(); |
47 | void enqueueEvent(Ref<Event>&&); |
48 | |
49 | private: |
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 | |
65 | class EventQueueScope { |
66 | WTF_MAKE_NONCOPYABLE(EventQueueScope); |
67 | public: |
68 | EventQueueScope() { ScopedEventQueue::singleton().incrementScopingLevel(); } |
69 | ~EventQueueScope() { ScopedEventQueue::singleton().decrementScopingLevel(); } |
70 | }; |
71 | |
72 | } // namespace WebCore |
73 | |