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/*
* Copyright (C) 2013 Apple 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. AND ITS CONTRIBUTORS ``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 ITS 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 PageThrottler_h
#define PageThrottler_h
#include "Timer.h"
#include "UserActivity.h"
#include "ViewState.h"
#include <wtf/WeakPtr.h>
namespace WebCore {
class Page;
class PageActivityAssertionToken;
class PageThrottler {
WTF_MAKE_FAST_ALLOCATED;
public:
PageThrottler(Page&, ViewState::Flags);
void createUserActivity();
void setViewState(ViewState::Flags);
void didReceiveUserInput() { m_hysteresis.impulse(); }
void pluginDidEvaluateWhileAudioIsPlaying() { m_hysteresis.impulse(); }
std::unique_ptr<PageActivityAssertionToken> mediaActivityToken();
std::unique_ptr<PageActivityAssertionToken> pageLoadActivityToken();
private:
friend class PageActivityAssertionToken;
WeakPtr<PageThrottler> weakPtr() { return m_weakPtrFactory.createWeakPtr(); }
void incrementActivityCount();
void decrementActivityCount();
void updateUserActivity();
friend class HysteresisActivity<PageThrottler>;
WEBCORE_EXPORT void started();
void stopped();
Page& m_page;
ViewState::Flags m_viewState;
WeakPtrFactory<PageThrottler> m_weakPtrFactory;
HysteresisActivity<PageThrottler> m_hysteresis;
std::unique_ptr<UserActivity::Impl> m_activity;
size_t m_activityCount;
};
}
#endif
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