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      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 "FocusController.h"
     30 #include "Frame.h"
     31 #include "FrameView.h"
     32 #include "Page.h"
     33 #include <wtf/CurrentTime.h>
     34 #include <wtf/RefCountedLeakCounter.h>
     35 
     36 using namespace JSC;
     37 
     38 namespace WebCore {
     39 
     40 #ifndef NDEBUG
     41 static WTF::RefCountedLeakCounter cachedPageCounter("CachedPage");
     42 #endif
     43 
     44 PassRefPtr<CachedPage> CachedPage::create(Page* page)
     45 {
     46     return adoptRef(new CachedPage(page));
     47 }
     48 
     49 CachedPage::CachedPage(Page* page)
     50     : m_timeStamp(currentTime())
     51     , m_cachedMainFrame(CachedFrame::create(page->mainFrame()))
     52 {
     53 #ifndef NDEBUG
     54     cachedPageCounter.increment();
     55 #endif
     56 }
     57 
     58 CachedPage::~CachedPage()
     59 {
     60 #ifndef NDEBUG
     61     cachedPageCounter.decrement();
     62 #endif
     63 
     64     destroy();
     65     ASSERT(!m_cachedMainFrame);
     66 }
     67 
     68 void CachedPage::restore(Page* page)
     69 {
     70     ASSERT(m_cachedMainFrame);
     71     ASSERT(page && page->mainFrame() && page->mainFrame() == m_cachedMainFrame->view()->frame());
     72     ASSERT(!page->frameCount());
     73 
     74     m_cachedMainFrame->open();
     75 
     76     // Restore the focus appearance for the focused element.
     77     // 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.
     78     Document* focusedDocument = page->focusController()->focusedOrMainFrame()->document();
     79     if (Node* node = focusedDocument->focusedNode()) {
     80         if (node->isElementNode())
     81             static_cast<Element*>(node)->updateFocusAppearance(true);
     82     }
     83 
     84     clear();
     85 }
     86 
     87 void CachedPage::clear()
     88 {
     89     ASSERT(m_cachedMainFrame);
     90     m_cachedMainFrame->clear();
     91     m_cachedMainFrame = 0;
     92 }
     93 
     94 void CachedPage::destroy()
     95 {
     96     if (m_cachedMainFrame)
     97         m_cachedMainFrame->destroy();
     98 
     99     m_cachedMainFrame = 0;
    100 }
    101 
    102 } // namespace WebCore
    103