/* * 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/RefCounter.h> namespace WebCore { class Page; enum PageActivityAssertionTokenType { }; typedef RefCounter::Token<PageActivityAssertionTokenType> PageActivityAssertionToken; struct PageActivityState { enum { UserInputActivity = 1 << 0, AudiblePlugin = 1 << 1, MediaActivity = 1 << 2, PageLoadActivity = 1 << 3, }; typedef unsigned Flags; static const Flags NoFlags = 0; static const Flags AllFlags = UserInputActivity | AudiblePlugin | MediaActivity | PageLoadActivity; }; class PageThrottler { WTF_MAKE_FAST_ALLOCATED; public: PageThrottler(Page&); void didReceiveUserInput() { m_userInputHysteresis.impulse(); } void pluginDidEvaluateWhileAudioIsPlaying() { m_audiblePluginHysteresis.impulse(); } PageActivityAssertionToken mediaActivityToken(); PageActivityAssertionToken pageLoadActivityToken(); private: void setActivityFlag(PageActivityState::Flags, bool); Page& m_page; PageActivityState::Flags m_activityState { PageActivityState::NoFlags }; HysteresisActivity m_userInputHysteresis; HysteresisActivity m_audiblePluginHysteresis; RefCounter m_mediaActivityCounter; RefCounter m_pageLoadActivityCounter; }; } #endif