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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CEReactionsScope_h | |
6 #define CEReactionsScope_h | |
7 | |
8 #include "core/CoreExport.h" | |
9 #include "platform/heap/Handle.h" | |
10 #include "wtf/Allocator.h" | |
11 #include "wtf/Noncopyable.h" | |
12 #include "wtf/StdLibExtras.h" | |
13 | |
14 namespace blink { | |
15 | |
16 class CustomElementReaction; | |
17 class Element; | |
18 class FrameHost; | |
19 | |
20 // https://html.spec.whatwg.org/multipage/scripting.html#cereactions | |
21 class CORE_EXPORT CEReactionsScope final { | |
22 STACK_ALLOCATED(); | |
23 WTF_MAKE_NONCOPYABLE(CEReactionsScope); | |
24 public: | |
25 static CEReactionsScope* current() | |
26 { | |
27 return topOfStack(); | |
28 } | |
29 | |
30 CEReactionsScope() | |
31 : m_prev(topOfStack()) | |
32 { | |
33 topOfStack() = this; | |
34 } | |
35 | |
36 ~CEReactionsScope() | |
37 { | |
38 CEReactionsScope** top = &topOfStack(); | |
39 *top = (*top)->m_prev; | |
40 if (m_frameHost.get()) | |
41 invokeReactions(); | |
42 } | |
43 | |
44 void enqueue(Element*, CustomElementReaction*); | |
45 | |
46 private: | |
47 static CEReactionsScope*& topOfStack() | |
48 { | |
49 static CEReactionsScope* top = nullptr; | |
yosin_UTC9
2016/06/02 04:06:38
It is better to have |static CReactionScopt* top|
yosin_UTC9
2016/06/02 04:13:51
If we use file level variable, this class can be s
| |
50 return top; | |
51 } | |
52 | |
53 void invokeReactions(); | |
54 | |
55 CEReactionsScope* m_prev; | |
56 Member<FrameHost> m_frameHost; | |
57 }; | |
58 | |
59 } // namespace blink | |
60 | |
61 #endif // CEReactionsScope_h | |
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