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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 <wtf/HashSet.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
class Page;
class PageActivityAssertionToken;
class PageThrottler {
public:
static PassOwnPtr<PageThrottler> create(Page* page)
{
return adoptPtr(new PageThrottler(page));
}
bool shouldThrottleAnimations() const { return m_throttleState != PageNotThrottledState; }
bool shouldThrottleTimers() const { return m_throttleState != PageNotThrottledState; }
void setThrottled(bool);
void reportInterestingEvent();
~PageThrottler();
private:
enum PageThrottleState {
PageNotThrottledState,
PageWaitingToThrottleState,
PageThrottledState
};
friend class PageActivityAssertionToken;
void addActivityToken(PageActivityAssertionToken*);
void removeActivityToken(PageActivityAssertionToken*);
PageThrottler(Page*);
void startThrottleHysteresisTimer();
void stopThrottleHysteresisTimer();
void throttleHysteresisTimerFired(Timer<PageThrottler>*);
Page* m_page;
void throttlePage();
void unthrottlePage();
PageThrottleState m_throttleState;
Timer<PageThrottler> m_throttleHysteresisTimer;
HashSet<PageActivityAssertionToken*> m_activityTokens;
};
}
#endif
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