C++ Page::backForward方法代码示例

// Main funnel for navigating to a previous location (back/forward, non-search snap-back)
// This includes recursion to handle loading into framesets properly
void HistoryController::goToItem(HistoryItem* targetItem, FrameLoadType type)
{
    ASSERT(!m_frame->tree()->parent());
    
    // shouldGoToHistoryItem is a private delegate method. This is needed to fix:
    // <rdar://problem/3951283> can view pages from the back/forward cache that should be disallowed by Parental Controls
    // Ultimately, history item navigations should go through the policy delegate. That's covered in:
    // <rdar://problem/3979539> back/forward cache navigations should consult policy delegate
    Page* page = m_frame->page();
    if (!page)
        return;
    if (!m_frame->loader()->client()->shouldGoToHistoryItem(targetItem))
        return;
    if (m_defersLoading) {
        m_deferredItem = targetItem;
        m_deferredFrameLoadType = type;
        return;
    }

    // Set the BF cursor before commit, which lets the user quickly click back/forward again.
    // - plus, it only makes sense for the top level of the operation through the frametree,
    // as opposed to happening for some/one of the page commits that might happen soon
    RefPtr<HistoryItem> currentItem = page->backForward()->currentItem();
    page->backForward()->setCurrentItem(targetItem);
    m_frame->loader()->client()->updateGlobalHistoryItemForPage();

    // First set the provisional item of any frames that are not actually navigating.
    // This must be done before trying to navigate the desired frame, because some
    // navigations can commit immediately (such as about:blank).  We must be sure that
    // all frames have provisional items set before the commit.
    recursiveSetProvisionalItem(targetItem, currentItem.get(), type);
    // Now that all other frames have provisional items, do the actual navigation.
    recursiveGoToItem(targetItem, currentItem.get(), type);
}

void HistoryController::pushState(PassRefPtr<SerializedScriptValue> stateObject, const String& title, const String& urlString)
{
    if (!m_currentItem)
        return;

    Page* page = m_frame->page();
    ASSERT(page);

    // Get a HistoryItem tree for the current frame tree.
    RefPtr<HistoryItem> topItem = page->mainFrame()->loader()->history()->createItemTree(m_frame, false);
    
    // Override data in the current item (created by createItemTree) to reflect
    // the pushState() arguments.
    m_currentItem->setTitle(title);
    m_currentItem->setStateObject(stateObject);
    m_currentItem->setURLString(urlString);

    page->backForward()->addItem(topItem.release());

    Settings* settings = m_frame->settings();
    if (!settings || settings->privateBrowsingEnabled())
        return;

    addVisitedLink(page, KURL(ParsedURLString, urlString));
    m_frame->loader()->client()->updateGlobalHistory();

}

void HistoryController::pushState(PassRefPtr<SerializedScriptValue> stateObject, const String& title, const String& urlString)
{
    if (!m_currentItem)
        return;

    Page* page = m_frame.page();
    ASSERT(page);

    // Get a HistoryItem tree for the current frame tree.
    Ref<HistoryItem> topItem = m_frame.mainFrame().loader().history().createItemTree(m_frame, false);
    
    // Override data in the current item (created by createItemTree) to reflect
    // the pushState() arguments.
    m_currentItem->setTitle(title);
    m_currentItem->setStateObject(stateObject);
    m_currentItem->setURLString(urlString);

    LOG(History, "HistoryController %p pushState: Adding top item %p, setting url of current item %p to %s", this, topItem.ptr(), m_currentItem.get(), urlString.ascii().data());

    page->backForward().addItem(WTFMove(topItem));

    if (m_frame.page()->usesEphemeralSession())
        return;

    addVisitedLink(*page, URL(ParsedURLString, urlString));
    m_frame.loader().client().updateGlobalHistory();
}

// Main funnel for navigating to a previous location (back/forward, non-search snap-back)
// This includes recursion to handle loading into framesets properly
void HistoryController::goToItem(HistoryItem* targetItem, FrameLoadType type)
{
    ASSERT(!m_frame->tree()->parent());
    
    // shouldGoToHistoryItem is a private delegate method. This is needed to fix:
    // <rdar://problem/3951283> can view pages from the back/forward cache that should be disallowed by Parental Controls
    // Ultimately, history item navigations should go through the policy delegate. That's covered in:
    // <rdar://problem/3979539> back/forward cache navigations should consult policy delegate
    Page* page = m_frame->page();
    if (!page)
        return;
    if (!m_frame->loader()->client()->shouldGoToHistoryItem(targetItem))
        return;

    // Set the BF cursor before commit, which lets the user quickly click back/forward again.
    // - plus, it only makes sense for the top level of the operation through the frametree,
    // as opposed to happening for some/one of the page commits that might happen soon
    HistoryItem* currentItem = page->backForward()->currentItem();    
    page->backForward()->setCurrentItem(targetItem);
    Settings* settings = m_frame->settings();
    page->setGlobalHistoryItem((!settings || settings->privateBrowsingEnabled()) ? 0 : targetItem);
    recursiveGoToItem(targetItem, currentItem, type);
}

void Frame::setPageAndTextZoomFactors(float pageZoomFactor, float textZoomFactor)
{
    if (m_pageZoomFactor == pageZoomFactor && m_textZoomFactor == textZoomFactor)
        return;

    Page* page = this->page();
    if (!page)
        return;

    Document* document = this->document();
    if (!document)
        return;

    m_editor.dismissCorrectionPanelAsIgnored();

#if ENABLE(SVG)
    // Respect SVGs zoomAndPan="disabled" property in standalone SVG documents.
    // FIXME: How to handle compound documents + zoomAndPan="disabled"? Needs SVG WG clarification.
    if (document->isSVGDocument()) {
        if (!static_cast<SVGDocument*>(document)->zoomAndPanEnabled())
            return;
    }
#endif

    if (m_pageZoomFactor != pageZoomFactor) {
        if (FrameView* view = this->view()) {
            // Update the scroll position when doing a full page zoom, so the content stays in relatively the same position.
            LayoutPoint scrollPosition = view->scrollPosition();
            float percentDifference = (pageZoomFactor / m_pageZoomFactor);
            view->setScrollPosition(IntPoint(scrollPosition.x() * percentDifference, scrollPosition.y() * percentDifference));
        }
    }

    m_pageZoomFactor = pageZoomFactor;
    m_textZoomFactor = textZoomFactor;

    document->recalcStyle(Node::Force);

    for (Frame* child = tree()->firstChild(); child; child = child->tree()->nextSibling())
        child->setPageAndTextZoomFactors(m_pageZoomFactor, m_textZoomFactor);

    if (FrameView* view = this->view()) {
        if (document->renderer() && document->renderer()->needsLayout() && view->didFirstLayout())
            view->layout();
    }

    if (page->mainFrame() == this)
        page->backForward()->markPagesForFullStyleRecalc();
}

void HistoryController::addState(PassRefPtr<SerializedScriptValue> stateObject, const String& title, const String& urlString)
{
    Page* page = m_frame->page();
    ASSERT(page);

    // Get a HistoryItem tree for the current frame tree.
    RefPtr<HistoryItem> item = HistoryItem::create();
    initializeItem(item.get());

    item->setTitle(title);
    item->setStateObject(stateObject);
    item->setURLString(urlString);

    page->backForward()->addItem(item.release());
    addVisitedLink(page, KURL(ParsedURLString, urlString));

    m_frame->loader()->client()->updateGlobalHistory();
}

void HistoryController::pushState(PassRefPtr<SerializedScriptValue> stateObject, const String& title, const String& urlString)
{
    if (!m_currentItem)
        return;

    Page* page = m_frame->page();
    ASSERT(page);

    // Get a HistoryItem tree for the current frame tree.
    RefPtr<HistoryItem> topItem = page->mainFrame()->loader()->history()->createItemTree(m_frame, false);

    // Override data in the current item (created by createItemTree) to reflect
    // the pushState() arguments.
    m_currentItem->setTitle(title);
    m_currentItem->setStateObject(stateObject);
    m_currentItem->setURLString(urlString);
    page->backForward().addItem(topItem.release());
}

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;

    FrameLoader& frameLoader = m_frame.mainFrame().loader();

    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());
}

void WMLDocument::finishedParsing()
{
    if (ScriptableDocumentParser* parser = this->scriptableDocumentParser()) {
        if (!parser->wellFormed()) {
            Document::finishedParsing();
            return;
        }
    }

    bool hasAccess = initialize(true);
    Document::finishedParsing();

    if (!hasAccess) {
        m_activeCard = 0;

        WMLPageState* wmlPageState = wmlPageStateForDocument(this);
        if (!wmlPageState)
            return;

        Page* page = wmlPageState->page();
        if (!page)
            return;

        HistoryItem* item = page->backForward()->backItem();
        if (!item)
            return;

        page->goToItem(item, FrameLoadTypeBackWMLDeckNotAccessible);
        return;
    }

    /// M: ALPS00439551 set a flag to prevent infinite loop in WMLDocument @{
    if (m_policyDownloadError) {
        m_policyDownloadError = false;
        return;
    }
    /// @}

    /// M: ALPS00439551 use a timer to trigger handleIntrinsicEventIfNeeded()
    m_intrinsicEventTimer.startOneShot(0.0f);
}