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1 /* | 1 /* |
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. | 2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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33 namespace blink { | 33 namespace blink { |
34 | 34 |
35 template<typename T, typename Observer, typename Notifier> | 35 template<typename T, typename Observer, typename Notifier> |
36 class LifecycleObserver : public WillBeGarbageCollectedMixin { | 36 class LifecycleObserver : public WillBeGarbageCollectedMixin { |
37 public: | 37 public: |
38 using Context = T; | 38 using Context = T; |
39 | 39 |
40 #if !ENABLE(OILPAN) | 40 #if !ENABLE(OILPAN) |
41 virtual ~LifecycleObserver() | 41 virtual ~LifecycleObserver() |
42 { | 42 { |
43 dispose(); | 43 clearContext(); |
44 } | 44 } |
45 #endif | 45 #endif |
46 | 46 |
47 EAGERLY_FINALIZE_WILL_BE_REMOVED(); | 47 EAGERLY_FINALIZE_WILL_BE_REMOVED(); |
48 DEFINE_INLINE_VIRTUAL_TRACE() | 48 DEFINE_INLINE_VIRTUAL_TRACE() |
49 { | 49 { |
50 visitor->trace(m_lifecycleContext); | 50 visitor->trace(m_lifecycleContext); |
51 } | 51 } |
52 | 52 |
53 virtual void contextDestroyed() { } | 53 virtual void contextDestroyed() { } |
54 | 54 |
55 void dispose() | |
56 { | |
57 setContext(nullptr); | |
58 } | |
59 | |
60 Context* lifecycleContext() const { return m_lifecycleContext; } | 55 Context* lifecycleContext() const { return m_lifecycleContext; } |
61 void clearLifecycleContext() { m_lifecycleContext = nullptr; } | 56 void clearLifecycleContext() { m_lifecycleContext = nullptr; } |
62 | 57 |
63 protected: | 58 protected: |
64 explicit LifecycleObserver(Context* context) | 59 explicit LifecycleObserver(Context* context) |
65 : m_lifecycleContext(nullptr) | 60 : m_lifecycleContext(nullptr) |
66 { | 61 { |
67 setContext(context); | 62 setContext(context); |
68 } | 63 } |
69 | 64 |
70 void setContext(Context*); | 65 void setContext(Context*); |
71 | 66 |
| 67 void clearContext() |
| 68 { |
| 69 setContext(nullptr); |
| 70 } |
| 71 |
72 private: | 72 private: |
73 RawPtrWillBeWeakMember<Context> m_lifecycleContext; | 73 RawPtrWillBeWeakMember<Context> m_lifecycleContext; |
74 }; | 74 }; |
75 | 75 |
76 template<typename T, typename Observer, typename Notifier> | 76 template<typename T, typename Observer, typename Notifier> |
77 inline void LifecycleObserver<T, Observer, Notifier>::setContext(typename Lifecy
cleObserver<T, Observer, Notifier>::Context* context) | 77 inline void LifecycleObserver<T, Observer, Notifier>::setContext(typename Lifecy
cleObserver<T, Observer, Notifier>::Context* context) |
78 { | 78 { |
79 if (m_lifecycleContext) | 79 if (m_lifecycleContext) |
80 static_cast<Notifier*>(m_lifecycleContext.get())->removeObserver(static_
cast<Observer*>(this)); | 80 static_cast<Notifier*>(m_lifecycleContext.get())->removeObserver(static_
cast<Observer*>(this)); |
81 | 81 |
82 m_lifecycleContext = context; | 82 m_lifecycleContext = context; |
83 | 83 |
84 if (m_lifecycleContext) | 84 if (m_lifecycleContext) |
85 static_cast<Notifier*>(m_lifecycleContext.get())->addObserver(static_cas
t<Observer*>(this)); | 85 static_cast<Notifier*>(m_lifecycleContext.get())->addObserver(static_cas
t<Observer*>(this)); |
86 } | 86 } |
87 | 87 |
88 } // namespace blink | 88 } // namespace blink |
89 | 89 |
90 #endif // LifecycleObserver_h | 90 #endif // LifecycleObserver_h |
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