third_party/WebKit/Source/core/frame/LocalFrameLifecycleObserver.h

/*
 * Copyright (C) 2011 Google, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef LocalFrameLifecycleObserver_h
#define LocalFrameLifecycleObserver_h

#include "core/CoreExport.h"
#include "core/frame/LocalFrame.h"
#include "platform/LifecycleObserver.h"
#include "platform/heap/Handle.h"

namespace blink {

class LocalFrame;
class LocalFrameLifecycleNotifier;

class CORE_EXPORT LocalFrameLifecycleObserver : public LifecycleObserver<LocalFrame, LocalFrameLifecycleObserver, LocalFrameLifecycleNotifier> {
public:
    virtual void willDetachFrameHost() { }
    virtual void contextDestroyed()
    {
        setContext(nullptr);
    }

    LocalFrame* frame() const { return lifecycleContext(); }

protected:
    explicit LocalFrameLifecycleObserver(LocalFrame* frame)
        : LifecycleObserver(frame)
    {
    }
};

} // namespace blink

#endif // LocalFrameLifecycleObserver_h