C++ CachedResourceLoader::requestUserCSSStyleSheet方法代码示例

void StyleRuleImport::requestStyleSheet()
{
    if (!m_parentStyleSheet)
        return;
    Document* document = m_parentStyleSheet->singleOwnerDocument();
    if (!document)
        return;

    CachedResourceLoader* cachedResourceLoader = document->cachedResourceLoader();
    if (!cachedResourceLoader)
        return;

    URL absURL;
    if (!m_parentStyleSheet->baseURL().isNull())
        // use parent styleheet's URL as the base URL
        absURL = URL(m_parentStyleSheet->baseURL(), m_strHref);
    else
        absURL = document->completeURL(m_strHref);

    // Check for a cycle in our import chain.  If we encounter a stylesheet
    // in our parent chain with the same URL, then just bail.
    StyleSheetContents* rootSheet = m_parentStyleSheet;
    for (StyleSheetContents* sheet = m_parentStyleSheet; sheet; sheet = sheet->parentStyleSheet()) {
        if (equalIgnoringFragmentIdentifier(absURL, sheet->baseURL())
            || equalIgnoringFragmentIdentifier(absURL, document->completeURL(sheet->originalURL())))
            return;
        rootSheet = sheet;
    }

    CachedResourceRequest request(ResourceRequest(absURL), m_parentStyleSheet->charset());
    request.setInitiator(cachedResourceRequestInitiators().css);
    if (m_cachedSheet)
        m_cachedSheet->removeClient(&m_styleSheetClient);
    if (m_parentStyleSheet->isUserStyleSheet())
        m_cachedSheet = cachedResourceLoader->requestUserCSSStyleSheet(request);
    else
        m_cachedSheet = cachedResourceLoader->requestCSSStyleSheet(request);
    if (m_cachedSheet) {
        // if the import rule is issued dynamically, the sheet may be
        // removed from the pending sheet count, so let the doc know
        // the sheet being imported is pending.
        if (m_parentStyleSheet && m_parentStyleSheet->loadCompleted() && rootSheet == m_parentStyleSheet)
            m_parentStyleSheet->startLoadingDynamicSheet();
        m_loading = true;
        m_cachedSheet->addClient(&m_styleSheetClient);
    }
}

void CSSImportRule::requestStyleSheet()
{
    CSSStyleSheet* parentSheet = parentStyleSheet();
    if (!parentSheet)
        return;
    Document* document = parentSheet->findDocument();
    if (!document)
        return;

    CachedResourceLoader* cachedResourceLoader = document->cachedResourceLoader();
    if (!cachedResourceLoader)
        return;

    String absHref = m_strHref;
    if (!parentSheet->finalURL().isNull())
        // use parent styleheet's URL as the base URL
        absHref = KURL(parentSheet->finalURL(), m_strHref).string();

    // Check for a cycle in our import chain.  If we encounter a stylesheet
    // in our parent chain with the same URL, then just bail.
    CSSStyleSheet* rootSheet = parentSheet;
    for (CSSStyleSheet* sheet = parentSheet; sheet; sheet = sheet->parentStyleSheet()) {
        // FIXME: This is wrong if the finalURL was updated via document::updateBaseURL.
        if (absHref == sheet->finalURL().string())
            return;
        rootSheet = sheet;
    }

    ResourceRequest request(document->completeURL(absHref));
    if (parentSheet->isUserStyleSheet())
        m_cachedSheet = cachedResourceLoader->requestUserCSSStyleSheet(request, parentSheet->charset());
    else
        m_cachedSheet = cachedResourceLoader->requestCSSStyleSheet(request, parentSheet->charset());
    if (m_cachedSheet) {
        // if the import rule is issued dynamically, the sheet may be
        // removed from the pending sheet count, so let the doc know
        // the sheet being imported is pending.
        if (parentSheet && parentSheet->loadCompleted() && rootSheet == parentSheet)
            parentSheet->startLoadingDynamicSheet();
        m_loading = true;
        m_cachedSheet->addClient(&m_styleSheetClient);
    }
}

void CSSImportRule::insertedIntoParent()
{
    CSSStyleSheet* parentSheet = parentStyleSheet();
    if (!parentSheet || !parentSheet->document())
        return;

    CachedResourceLoader* cachedResourceLoader = parentSheet->document()->cachedResourceLoader();
    if (!cachedResourceLoader)
        return;

    String absHref = m_strHref;
    if (!parentSheet->finalURL().isNull())
        // use parent styleheet's URL as the base URL
        absHref = KURL(parentSheet->finalURL(), m_strHref).string();

    // Check for a cycle in our import chain.  If we encounter a stylesheet
    // in our parent chain with the same URL, then just bail.
    StyleBase* root = this;
    for (StyleBase* curr = parent(); curr; curr = curr->parent()) {
        // FIXME: This is wrong if the finalURL was updated via document::updateBaseURL. 
        if (curr->isCSSStyleSheet() && absHref == static_cast<CSSStyleSheet*>(curr)->finalURL().string())
            return;
        root = curr;
    }

    if (parentSheet->isUserStyleSheet())
        m_cachedSheet = cachedResourceLoader->requestUserCSSStyleSheet(absHref, parentSheet->charset());
    else
        m_cachedSheet = cachedResourceLoader->requestCSSStyleSheet(absHref, parentSheet->charset());
    if (m_cachedSheet) {
        // if the import rule is issued dynamically, the sheet may be
        // removed from the pending sheet count, so let the doc know
        // the sheet being imported is pending.
        if (parentSheet && parentSheet->loadCompleted() && root == parentSheet)
            parentSheet->document()->addPendingSheet();
        m_loading = true;
        m_cachedSheet->addClient(this);
    }
}

void StyleRuleImport::requestStyleSheet(CSSStyleSheet* rootSheet, const CSSParserContext& parserContext)
{
    ASSERT(!rootSheet->parentStyleSheet());
    ASSERT(!m_cachedSheet);

    Node* ownerNode = rootSheet->ownerNode();
    if (!ownerNode)
        return;
    Document* document = ownerNode->document();

    KURL resolvedURL;
    if (!parserContext.baseURL.isNull())
        resolvedURL = KURL(parserContext.baseURL, m_strHref);
    else
        resolvedURL = document->completeURL(m_strHref);

    StyleSheetContents* rootSheetContents = rootSheet->contents();
    if (rootSheetContents->hasImportCycle(this, resolvedURL, document->baseURL()))
        return;

    ResourceRequest request(resolvedURL);
    CachedResourceLoader* cachedResourceLoader = document->cachedResourceLoader();
    if (rootSheetContents->isUserStyleSheet())
        m_cachedSheet = cachedResourceLoader->requestUserCSSStyleSheet(request, parserContext.charset);
    else
        m_cachedSheet = cachedResourceLoader->requestCSSStyleSheet(request, parserContext.charset);

    if (!m_cachedSheet)
        return;
    // if the import rule is issued dynamically, the sheet may be
    // removed from the pending sheet count, so let the doc know
    // the sheet being imported is pending.
    if (rootSheetContents->loadCompleted())
        ownerNode->startLoadingDynamicSheet();

    m_loadContext = adoptPtr(new LoadContext(rootSheet, parserContext));
    m_cachedSheet->addClient(this);
}