1/* 2 * Copyright (C) 2006, 2007, 2008 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 COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "CachedPage.h" 28 29#include "Document.h" 30#include "Element.h" 31#include "FocusController.h" 32#include "Frame.h" 33#include "FrameView.h" 34#include "Node.h" 35#include "Page.h" 36#include "Settings.h" 37#include "VisitedLinkState.h" 38#include <wtf/CurrentTime.h> 39#include <wtf/RefCountedLeakCounter.h> 40#include <wtf/StdLibExtras.h> 41 42using namespace JSC; 43 44namespace WebCore { 45 46DEFINE_DEBUG_ONLY_GLOBAL(WTF::RefCountedLeakCounter, cachedPageCounter, ("CachedPage")); 47 48PassRefPtr<CachedPage> CachedPage::create(Page* page) 49{ 50 return adoptRef(new CachedPage(page)); 51} 52 53CachedPage::CachedPage(Page* page) 54 : m_timeStamp(currentTime()) 55 , m_expirationTime(m_timeStamp + page->settings()->backForwardCacheExpirationInterval()) 56 , m_cachedMainFrame(CachedFrame::create(page->mainFrame())) 57 , m_needStyleRecalcForVisitedLinks(false) 58 , m_needsFullStyleRecalc(false) 59 , m_needsCaptionPreferencesChanged(false) 60 , m_needsDeviceScaleChanged(false) 61{ 62#ifndef NDEBUG 63 cachedPageCounter.increment(); 64#endif 65} 66 67CachedPage::~CachedPage() 68{ 69#ifndef NDEBUG 70 cachedPageCounter.decrement(); 71#endif 72 73 destroy(); 74 ASSERT(!m_cachedMainFrame); 75} 76 77void CachedPage::restore(Page* page) 78{ 79 ASSERT(m_cachedMainFrame); 80 ASSERT(page && page->mainFrame() && page->mainFrame() == m_cachedMainFrame->view()->frame()); 81 ASSERT(!page->subframeCount()); 82 83 m_cachedMainFrame->open(); 84 85 // Restore the focus appearance for the focused element. 86 // FIXME: Right now we don't support pages w/ frames in the b/f cache. This may need to be tweaked when we add support for that. 87 Document* focusedDocument = page->focusController()->focusedOrMainFrame()->document(); 88 if (Element* element = focusedDocument->focusedElement()) 89 element->updateFocusAppearance(true); 90 91 if (m_needStyleRecalcForVisitedLinks) { 92 for (Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) 93 frame->document()->visitedLinkState()->invalidateStyleForAllLinks(); 94 } 95 96#if USE(ACCELERATED_COMPOSITING) 97 if (m_needsDeviceScaleChanged) { 98 if (Frame* frame = page->mainFrame()) 99 frame->deviceOrPageScaleFactorChanged(); 100 } 101#endif 102 103 if (m_needsFullStyleRecalc) 104 page->setNeedsRecalcStyleInAllFrames(); 105 106#if ENABLE(VIDEO_TRACK) 107 if (m_needsCaptionPreferencesChanged) 108 page->captionPreferencesChanged(); 109#endif 110 111 clear(); 112} 113 114void CachedPage::clear() 115{ 116 ASSERT(m_cachedMainFrame); 117 m_cachedMainFrame->clear(); 118 m_cachedMainFrame = 0; 119 m_needStyleRecalcForVisitedLinks = false; 120 m_needsFullStyleRecalc = false; 121} 122 123void CachedPage::destroy() 124{ 125 if (m_cachedMainFrame) 126 m_cachedMainFrame->destroy(); 127 128 m_cachedMainFrame = 0; 129} 130 131bool CachedPage::hasExpired() const 132{ 133 return currentTime() > m_expirationTime; 134} 135 136} // namespace WebCore 137