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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef DocumentVisibilityObserver_h | 5 #ifndef DocumentVisibilityObserver_h |
6 #define DocumentVisibilityObserver_h | 6 #define DocumentVisibilityObserver_h |
7 | 7 |
8 #include "core/CoreExport.h" | 8 #include "core/CoreExport.h" |
9 #include "core/page/PageVisibilityState.h" | 9 #include "core/page/PageVisibilityState.h" |
10 #include "platform/heap/Handle.h" | 10 #include "platform/heap/Handle.h" |
11 | 11 |
12 namespace blink { | 12 namespace blink { |
13 | 13 |
14 class Document; | 14 class Document; |
15 | 15 |
16 class CORE_EXPORT DocumentVisibilityObserver : public WillBeGarbageCollectedMixi
n { | 16 class CORE_EXPORT DocumentVisibilityObserver : public WillBeGarbageCollectedMixi
n { |
17 WTF_MAKE_NONCOPYABLE(DocumentVisibilityObserver); | 17 WTF_MAKE_NONCOPYABLE(DocumentVisibilityObserver); |
18 public: | 18 public: |
19 explicit DocumentVisibilityObserver(Document&); | 19 explicit DocumentVisibilityObserver(Document&); |
20 virtual ~DocumentVisibilityObserver(); | 20 virtual ~DocumentVisibilityObserver(); |
21 | 21 |
22 virtual void didChangeVisibilityState(PageVisibilityState) = 0; | 22 virtual void didChangeVisibilityState(PageVisibilityState) = 0; |
| 23 virtual void willDetachDocument() = 0; |
23 | 24 |
24 // Classes that inherit Node and DocumentVisibilityObserver must have a | 25 // Classes that inherit Node and DocumentVisibilityObserver must have a |
25 // virtual override of Node::didMoveToNewDocument that calls | 26 // virtual override of Node::didMoveToNewDocument that calls |
26 // DocumentVisibilityObserver::setDocument | 27 // DocumentVisibilityObserver::setDocument |
27 void setObservedDocument(Document&); | 28 void setObservedDocument(Document&); |
28 | 29 |
29 protected: | 30 protected: |
30 DECLARE_VIRTUAL_TRACE(); | 31 DECLARE_VIRTUAL_TRACE(); |
31 | 32 |
32 private: | 33 private: |
33 void registerObserver(Document&); | 34 void registerObserver(Document&); |
34 void unregisterObserver(); | 35 void unregisterObserver(); |
35 | 36 |
36 RawPtrWillBeMember<Document> m_document; | 37 RawPtrWillBeMember<Document> m_document; |
37 }; | 38 }; |
38 | 39 |
39 } // namespace blink | 40 } // namespace blink |
40 | 41 |
41 #endif // DocumentVisibilityObserver_h | 42 #endif // DocumentVisibilityObserver_h |
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