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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 s_topOfStack; |
| 28 } |
| 29 |
| 30 CEReactionsScope() |
| 31 : m_prev(s_topOfStack) |
| 32 { |
| 33 s_topOfStack = this; |
| 34 } |
| 35 |
| 36 ~CEReactionsScope() |
| 37 { |
| 38 s_topOfStack = s_topOfStack->m_prev; |
| 39 if (m_frameHost.get()) |
| 40 invokeReactions(); |
| 41 } |
| 42 |
| 43 void enqueue(Element*, CustomElementReaction*); |
| 44 |
| 45 private: |
| 46 static CEReactionsScope* s_topOfStack; |
| 47 |
| 48 void invokeReactions(); |
| 49 |
| 50 CEReactionsScope* m_prev; |
| 51 Member<FrameHost> m_frameHost; |
| 52 }; |
| 53 |
| 54 } // namespace blink |
| 55 |
| 56 #endif // CEReactionsScope_h |
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