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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  *
     25  */
     26 
     27 #ifndef LifecycleObserver_h
     28 #define LifecycleObserver_h
     29 
     30 namespace WebCore {
     31 
     32 class LifecycleContext;
     33 
     34 class LifecycleObserver {
     35 public:
     36     enum Type {
     37         ActiveDOMObjectType,
     38         DocumentLifecycleObserverType,
     39         GenericType,
     40         PageLifecycleObserverType
     41     };
     42 
     43     explicit LifecycleObserver(LifecycleContext*, Type = GenericType);
     44 
     45     virtual void contextDestroyed();
     46 
     47     LifecycleContext* lifecycleContext() const { return m_lifecycleContext; }
     48     Type observerType() const { return m_observerType; }
     49 
     50 protected:
     51     virtual ~LifecycleObserver();
     52 
     53     void observeContext(LifecycleContext*);
     54 
     55     LifecycleContext* m_lifecycleContext;
     56     Type m_observerType;
     57 };
     58 
     59 } // namespace WebCore
     60 
     61 #endif // LifecycleObserver_h
     62