diff -r 000000000000 -r 4f2f89ce4247 WebCore/history/CachedFrame.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/history/CachedFrame.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,254 @@
+/*
+ * Copyright (C) 2009 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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. 
+ */
+ 
+#include "config.h"
+#include "CachedPage.h"
+
+#include "CachedFramePlatformData.h"
+#include "DocumentLoader.h"
+#include "ExceptionCode.h"
+#include "EventNames.h"
+#include "Frame.h"
+#include "FrameLoaderClient.h"
+#include "FrameView.h"
+#include "Logging.h"
+#include "PageTransitionEvent.h"
+#include <wtf/text/CString.h>
+#include <wtf/RefCountedLeakCounter.h>
+
+#if ENABLE(SVG)
+#include "SVGDocumentExtensions.h"
+#endif
+
+#if ENABLE(TOUCH_EVENTS)
+#include "Chrome.h"
+#include "ChromeClient.h"
+#include "Page.h"
+#endif
+
+namespace WebCore {
+
+#ifndef NDEBUG
+static WTF::RefCountedLeakCounter& cachedFrameCounter()
+{
+    DEFINE_STATIC_LOCAL(WTF::RefCountedLeakCounter, counter, ("CachedFrame"));
+    return counter;
+}
+#endif
+
+CachedFrameBase::CachedFrameBase(Frame* frame)
+    : m_document(frame->document())
+    , m_documentLoader(frame->loader()->documentLoader())
+    , m_view(frame->view())
+    , m_mousePressNode(frame->eventHandler()->mousePressNode())
+    , m_url(frame->loader()->url())
+    , m_isMainFrame(!frame->tree()->parent())
+{
+}
+
+CachedFrameBase::~CachedFrameBase()
+{
+#ifndef NDEBUG
+    cachedFrameCounter().decrement();
+#endif
+    // CachedFrames should always have had destroy() called by their parent CachedPage
+    ASSERT(!m_document);
+}
+
+void CachedFrameBase::restore()
+{
+    ASSERT(m_document->view() == m_view);
+    
+    Frame* frame = m_view->frame();
+    m_cachedFrameScriptData->restore(frame);
+
+#if ENABLE(SVG)
+    if (m_document->svgExtensions())
+        m_document->accessSVGExtensions()->unpauseAnimations();
+#endif
+
+    frame->animation()->resumeAnimations(m_document.get());
+    frame->eventHandler()->setMousePressNode(m_mousePressNode.get());
+    m_document->resumeActiveDOMObjects();
+
+    // It is necessary to update any platform script objects after restoring the
+    // cached page.
+    frame->script()->updatePlatformScriptObjects();
+
+    // Reconstruct the FrameTree
+    for (unsigned i = 0; i < m_childFrames.size(); ++i)
+        frame->tree()->appendChild(m_childFrames[i]->view()->frame());
+
+    // Open the child CachedFrames in their respective FrameLoaders.
+    for (unsigned i = 0; i < m_childFrames.size(); ++i)
+        m_childFrames[i]->open();
+
+    m_document->enqueuePageshowEvent(PageshowEventPersisted);
+#if ENABLE(TOUCH_EVENTS)
+    if (m_document->hasListenerType(Document::TOUCH_LISTENER))
+        m_document->page()->chrome()->client()->needTouchEvents(true);
+#endif
+}
+
+CachedFrame::CachedFrame(Frame* frame)
+    : CachedFrameBase(frame)
+{
+#ifndef NDEBUG
+    cachedFrameCounter().increment();
+#endif
+    ASSERT(m_document);
+    ASSERT(m_documentLoader);
+    ASSERT(m_view);
+
+    // Active DOM objects must be suspended before we cached the frame script data
+    m_document->suspendActiveDOMObjects();
+    m_cachedFrameScriptData = adoptPtr(new ScriptCachedFrameData(frame));
+    
+    // Custom scrollbar renderers will get reattached when the document comes out of the page cache
+    m_view->detachCustomScrollbars();
+
+    m_document->documentWillBecomeInactive();
+    frame->clearTimers();
+    m_document->setInPageCache(true);
+    frame->loader()->stopLoading(UnloadEventPolicyUnloadAndPageHide);
+    
+    frame->loader()->client()->savePlatformDataToCachedFrame(this);
+
+    // Create the CachedFrames for all Frames in the FrameTree.
+    for (Frame* child = frame->tree()->firstChild(); child; child = child->tree()->nextSibling())
+        m_childFrames.append(CachedFrame::create(child));
+
+    // Deconstruct the FrameTree, to restore it later.
+    // We do this for two reasons:
+    // 1 - We reuse the main frame, so when it navigates to a new page load it needs to start with a blank FrameTree.
+    // 2 - It's much easier to destroy a CachedFrame while it resides in the PageCache if it is disconnected from its parent.
+    for (unsigned i = 0; i < m_childFrames.size(); ++i)
+        frame->tree()->removeChild(m_childFrames[i]->view()->frame());
+
+    if (!m_isMainFrame)
+        frame->page()->decrementFrameCount();
+
+#ifndef NDEBUG
+    if (m_isMainFrame)
+        LOG(PageCache, "Finished creating CachedFrame for main frame url '%s' and DocumentLoader %p\n", m_url.string().utf8().data(), m_documentLoader.get());
+    else
+        LOG(PageCache, "Finished creating CachedFrame for child frame with url '%s' and DocumentLoader %p\n", m_url.string().utf8().data(), m_documentLoader.get());
+#endif
+
+#if ENABLE(TOUCH_EVENTS)
+    if (m_document->hasListenerType(Document::TOUCH_LISTENER))
+        m_document->page()->chrome()->client()->needTouchEvents(false);
+#endif
+}
+
+void CachedFrame::open()
+{
+    ASSERT(m_view);
+    m_view->frame()->loader()->open(*this);
+
+    if (!m_isMainFrame)
+        m_view->frame()->page()->incrementFrameCount();
+}
+
+void CachedFrame::clear()
+{
+    if (!m_document)
+        return;
+
+    // clear() should only be called for Frames representing documents that are no longer in the page cache.
+    // This means the CachedFrame has been:
+    // 1 - Successfully restore()'d by going back/forward.
+    // 2 - destroy()'ed because the PageCache is pruning or the WebView was closed.
+    ASSERT(!m_document->inPageCache());
+    ASSERT(m_view);
+    ASSERT(m_document->frame() == m_view->frame());
+
+    for (int i = m_childFrames.size() - 1; i >= 0; --i)
+        m_childFrames[i]->clear();
+
+    m_document = 0;
+    m_view = 0;
+    m_mousePressNode = 0;
+    m_url = KURL();
+
+    m_cachedFramePlatformData.clear();
+    m_cachedFrameScriptData.clear();
+}
+
+void CachedFrame::destroy()
+{
+    if (!m_document)
+        return;
+    
+    // Only CachedFrames that are still in the PageCache should be destroyed in this manner
+    ASSERT(m_document->inPageCache());
+    ASSERT(m_view);
+    ASSERT(m_document->frame() == m_view->frame());
+
+    if (!m_isMainFrame) {
+        m_view->frame()->detachFromPage();
+        m_view->frame()->loader()->detachViewsAndDocumentLoader();
+    }
+    
+    for (int i = m_childFrames.size() - 1; i >= 0; --i)
+        m_childFrames[i]->destroy();
+
+    if (m_cachedFramePlatformData)
+        m_cachedFramePlatformData->clear();
+
+    Frame::clearTimers(m_view.get(), m_document.get());
+
+    // FIXME: Why do we need to call removeAllEventListeners here? When the document is in page cache, this method won't work
+    // fully anyway, because the document won't be able to access its DOMWindow object (due to being frameless).
+    m_document->removeAllEventListeners();
+
+    m_document->setInPageCache(false);
+    // FIXME: We don't call willRemove here. Why is that OK?
+    m_document->detach();
+    m_view->clearFrame();
+
+    clear();
+}
+
+void CachedFrame::setCachedFramePlatformData(PassOwnPtr<CachedFramePlatformData> data)
+{
+    m_cachedFramePlatformData = data;
+}
+
+CachedFramePlatformData* CachedFrame::cachedFramePlatformData()
+{
+    return m_cachedFramePlatformData.get();
+}
+
+int CachedFrame::descendantFrameCount() const
+{
+    int count = m_childFrames.size();
+    for (size_t i = 0; i < m_childFrames.size(); ++i)
+        count += m_childFrames[i]->descendantFrameCount();
+    
+    return count;
+}
+
+} // namespace WebCore