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/*
* Copyright (C) 2013 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 APPLE 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 THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_PAGE_VISIBILITY_OBSERVER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_PAGE_VISIBILITY_OBSERVER_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/platform/lifecycle_observer.h"
namespace blink {
class CORE_EXPORT PageVisibilityObserver
: public LifecycleObserver<Page, PageVisibilityObserver> {
public:
virtual void PageVisibilityChanged() {}
Page* GetPage() const { return LifecycleContext(); }
protected:
explicit PageVisibilityObserver(Page* page) : LifecycleObserver(page) {}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_PAGE_VISIBILITY_OBSERVER_H_