bool PageCache::canCachePageContainingThisFrame(Frame* frame)
{
for (Frame* child = frame->tree()->firstChild(); child; child = child->tree()->nextSibling()) {
if (!canCachePageContainingThisFrame(child))
return false;
}
FrameLoader* frameLoader = frame->loader();
DocumentLoader* documentLoader = frameLoader->documentLoader();
Document* document = frame->document();
return documentLoader
&& documentLoader->mainDocumentError().isNull()
// Do not cache error pages (these can be recognized as pages with substitute data or unreachable URLs).
&& !(documentLoader->substituteData().isValid() && !documentLoader->substituteData().failingURL().isEmpty())
&& (!frameLoader->subframeLoader()->containsPlugins() || frame->page()->settings()->pageCacheSupportsPlugins())
&& (!document->url().protocolIs("https") || (!documentLoader->response().cacheControlContainsNoCache() && !documentLoader->response().cacheControlContainsNoStore()))
&& (!document->domWindow() || !document->domWindow()->hasEventListeners(eventNames().unloadEvent))
#if ENABLE(SQL_DATABASE)
&& !DatabaseManager::manager().hasOpenDatabases(document)
#endif
#if ENABLE(SHARED_WORKERS)
&& !SharedWorkerRepository::hasSharedWorkers(document)
#endif
&& frameLoader->history()->currentItem()
&& !frameLoader->quickRedirectComing()
&& !documentLoader->isLoadingInAPISense()
&& !documentLoader->isStopping()
&& document->canSuspendActiveDOMObjects()
// FIXME: We should investigating caching frames that have an associated
// application cache. <rdar://problem/5917899> tracks that work.
&& documentLoader->applicationCacheHost()->canCacheInPageCache()
&& frameLoader->client()->canCachePage();
}
PassRefPtr<HistoryItem> HistoryController::createItemTree(Frame* targetFrame, bool clipAtTarget)
{
RefPtr<HistoryItem> bfItem = createItem();
saveScrollPositionAndViewStateToItem(m_previousItem.get());
if (!clipAtTarget || m_frame != targetFrame) {
// save frame state for items that aren't loading (khtml doesn't save those)
saveDocumentState();
// clipAtTarget is false for navigations within the same document, so
// we should copy the documentSequenceNumber over to the newly create
// item. Non-target items are just clones, and they should therefore
// preserve the same itemSequenceNumber.
if (m_previousItem) {
if (m_frame != targetFrame)
bfItem->setItemSequenceNumber(m_previousItem->itemSequenceNumber());
bfItem->setDocumentSequenceNumber(m_previousItem->documentSequenceNumber());
}
for (Frame* child = m_frame->tree()->firstChild(); child; child = child->tree()->nextSibling()) {
// If the child is a frame corresponding to an <object> element that never loaded,
// we don't want to create a history item, because that causes fallback content
// to be ignored on reload.
FrameLoader* childLoader = child->loader();
if (childLoader->stateMachine()->startedFirstRealLoad() || !child->ownerElement()->isObjectElement())
bfItem->addChildItem(childLoader->history()->createItemTree(targetFrame, clipAtTarget));
}
}
// FIXME: Eliminate the isTargetItem flag in favor of itemSequenceNumber.
if (m_frame == targetFrame)
bfItem->setIsTargetItem(true);
return bfItem;
}
void HistoryController::updateBackForwardListClippedAtTarget(bool doClip)
{
// In the case of saving state about a page with frames, we store a tree of items that mirrors the frame tree.
// The item that was the target of the user's navigation is designated as the "targetItem".
// When this function is called with doClip=true we're able to create the whole tree except for the target's children,
// which will be loaded in the future. That part of the tree will be filled out as the child loads are committed.
Page* page = m_frame->page();
if (!page)
return;
if (m_frame->loader()->documentLoader()->urlForHistory().isEmpty())
return;
Frame* mainFrame = page->mainFrame();
ASSERT(mainFrame);
FrameLoader* frameLoader = mainFrame->loader();
frameLoader->checkDidPerformFirstNavigation();
RefPtr<HistoryItem> topItem = frameLoader->history()->createItemTree(m_frame, doClip);
LOG(BackForward, "WebCoreBackForward - Adding backforward item %p for frame %s", topItem.get(), m_frame->loader()->documentLoader()->url().string().ascii().data());
page->backForward()->addItem(topItem.release());
}
PassRefPtr<HistoryItem> HistoryController::createItemTree(Frame* targetFrame, bool clipAtTarget)
{
RefPtr<HistoryItem> bfItem = createItem(m_frame->tree()->parent() ? true : false);
if (m_previousItem)
saveScrollPositionAndViewStateToItem(m_previousItem.get());
if (!(clipAtTarget && m_frame == targetFrame)) {
// save frame state for items that aren't loading (khtml doesn't save those)
saveDocumentState();
for (Frame* child = m_frame->tree()->firstChild(); child; child = child->tree()->nextSibling()) {
FrameLoader* childLoader = child->loader();
bool hasChildLoaded = childLoader->frameHasLoaded();
// If the child is a frame corresponding to an <object> element that never loaded,
// we don't want to create a history item, because that causes fallback content
// to be ignored on reload.
if (!(!hasChildLoaded && childLoader->isHostedByObjectElement()))
bfItem->addChildItem(childLoader->history()->createItemTree(targetFrame, clipAtTarget));
}
}
if (m_frame == targetFrame)
bfItem->setIsTargetItem(true);
return bfItem;
}