1/* 2 * Copyright (C) 2013 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "PageThrottler.h" 28 29#include "Chrome.h" 30#include "ChromeClient.h" 31#include "MainFrame.h" 32#include "Page.h" 33#include "PageActivityAssertionToken.h" 34#include <wtf/StdLibExtras.h> 35 36namespace WebCore { 37 38PageThrottler::PageThrottler(Page& page, ViewState::Flags viewState) 39 : m_page(page) 40 , m_viewState(viewState) 41 , m_weakPtrFactory(this) 42 , m_hysteresis(*this) 43 , m_activity("Page is active.") 44 , m_activityCount(0) 45{ 46 if (!(m_viewState & ViewState::IsVisuallyIdle)) 47 m_hysteresis.start(); 48} 49 50std::unique_ptr<PageActivityAssertionToken> PageThrottler::mediaActivityToken() 51{ 52 return std::make_unique<PageActivityAssertionToken>(*this); 53} 54 55std::unique_ptr<PageActivityAssertionToken> PageThrottler::pageLoadActivityToken() 56{ 57 return std::make_unique<PageActivityAssertionToken>(*this); 58} 59 60void PageThrottler::incrementActivityCount() 61{ 62 ++m_activityCount; 63 updateHysteresis(); 64} 65 66void PageThrottler::decrementActivityCount() 67{ 68 --m_activityCount; 69 updateHysteresis(); 70} 71 72void PageThrottler::updateHysteresis() 73{ 74 if (m_activityCount || !(m_viewState & ViewState::IsVisuallyIdle)) 75 m_hysteresis.start(); 76 else 77 m_hysteresis.stop(); 78} 79 80void PageThrottler::setViewState(ViewState::Flags viewState) 81{ 82 ViewState::Flags changed = m_viewState ^ viewState; 83 m_viewState = viewState; 84 85 if (changed & ViewState::IsVisuallyIdle) 86 updateHysteresis(); 87} 88 89void PageThrottler::started() 90{ 91 m_activity.beginActivity(); 92} 93 94void PageThrottler::stopped() 95{ 96 m_activity.endActivity(); 97} 98 99} 100