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94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
/*
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* Copyright (C) 2008 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef SKY_ENGINE_PLATFORM_LIFECYCLEOBSERVER_H_
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#define SKY_ENGINE_PLATFORM_LIFECYCLEOBSERVER_H_
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#include "sky/engine/wtf/Assertions.h"
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namespace blink {
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template<typename T>
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class LifecycleObserver {
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public:
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typedef T Context;
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enum Type {
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ActiveDOMObjectType,
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DocumentLifecycleObserverType,
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GenericType,
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PageLifecycleObserverType,
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DOMWindowLifecycleObserverType
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};
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explicit LifecycleObserver(Context* context, Type type = GenericType)
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: m_lifecycleContext(0)
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, m_observerType(type)
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{
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observeContext(context);
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}
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virtual ~LifecycleObserver()
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{
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observeContext(0);
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}
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virtual void contextDestroyed() { m_lifecycleContext = 0; }
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Context* lifecycleContext() const { return m_lifecycleContext; }
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Type observerType() const { return m_observerType; }
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protected:
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void observeContext(Context*);
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Context* m_lifecycleContext;
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Type m_observerType;
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};
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//
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// These functions should be specialized for each LifecycleObserver instances.
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//
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template<typename T> void observerContext(T*, LifecycleObserver<T>*) { ASSERT_NOT_REACHED(); }
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template<typename T> void unobserverContext(T*, LifecycleObserver<T>*) { ASSERT_NOT_REACHED(); }
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template<typename T>
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inline void LifecycleObserver<T>::observeContext(typename LifecycleObserver<T>::Context* context)
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{
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if (m_lifecycleContext)
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unobserverContext(m_lifecycleContext, this);
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m_lifecycleContext = context;
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if (m_lifecycleContext)
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observerContext(m_lifecycleContext, this);
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}
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} // namespace blink
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#endif // SKY_ENGINE_PLATFORM_LIFECYCLEOBSERVER_H_
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