C++ RenderEmbeddedObject::hasFallbackContent方法代码示例

bool HTMLPlugInElement::requestObject(const String& url, const String& mimeType, const Vector<String>& paramNames, const Vector<String>& paramValues)
{
    if (url.isEmpty() && mimeType.isEmpty())
        return false;

    // FIXME: None of this code should use renderers!
    RenderEmbeddedObject* renderer = renderEmbeddedObject();
    ASSERT(renderer);
    if (!renderer)
        return false;

    KURL completedURL = document().completeURL(url);
    if (!pluginIsLoadable(completedURL, mimeType))
        return false;

    bool useFallback;
    if (shouldUsePlugin(completedURL, mimeType, renderer->hasFallbackContent(), useFallback))
        return loadPlugin(completedURL, mimeType, paramNames, paramValues, useFallback);

    // If the plug-in element already contains a subframe,
    // loadOrRedirectSubframe will re-use it. Otherwise, it will create a new
    // frame and set it as the RenderPart's widget, causing what was previously
    // in the widget to be torn down.
    return loadOrRedirectSubframe(completedURL, getNameAttribute(), true);
}

bool SubframeLoader::requestObject(HTMLPlugInImageElement* ownerElement, const String& url, const AtomicString& frameName,
    const String& mimeType, const Vector<String>& paramNames, const Vector<String>& paramValues)
{
    if (url.isEmpty() && mimeType.isEmpty())
        return false;
    
    if (!m_frame->script()->xssAuditor()->canLoadObject(url)) {
        // It is unsafe to honor the request for this object.
        return false;
    }

    // FIXME: None of this code should use renderers!
    RenderEmbeddedObject* renderer = ownerElement->renderEmbeddedObject();
    ASSERT(renderer);
    if (!renderer)
        return false;

    KURL completedURL;
    if (!url.isEmpty())
        completedURL = completeURL(url);

    bool useFallback;
    if (shouldUsePlugin(completedURL, mimeType, renderer->hasFallbackContent(), useFallback)) {
        Settings* settings = m_frame->settings();
        if ((!allowPlugins(AboutToInstantiatePlugin)
             // Application plugins are plugins implemented by the user agent, for example Qt plugins,
             // as opposed to third-party code such as flash. The user agent decides whether or not they are
             // permitted, rather than WebKit.
             && !MIMETypeRegistry::isApplicationPluginMIMEType(mimeType))
            || (!settings->isJavaEnabled() && MIMETypeRegistry::isJavaAppletMIMEType(mimeType)))
            return false;
        if (m_frame->document() && m_frame->document()->securityOrigin()->isSandboxed(SandboxPlugins))
            return false;

        ASSERT(ownerElement->hasTagName(objectTag) || ownerElement->hasTagName(embedTag));
        HTMLPlugInImageElement* pluginElement = static_cast<HTMLPlugInImageElement*>(ownerElement);

        return loadPlugin(pluginElement, completedURL, mimeType, paramNames, paramValues, useFallback);
    }

    // If the plug-in element already contains a subframe, loadOrRedirectSubframe will re-use it. Otherwise,
    // it will create a new frame and set it as the RenderPart's widget, causing what was previously 
    // in the widget to be torn down.
    return loadOrRedirectSubframe(ownerElement, completedURL, frameName, true, true);
}

bool SubframeLoader::requestObject(HTMLPlugInImageElement* ownerElement, const String& url, const AtomicString& frameName, const String& mimeType, const Vector<String>& paramNames, const Vector<String>& paramValues)
{
    if (url.isEmpty() && mimeType.isEmpty())
        return false;

    // FIXME: None of this code should use renderers!
    RenderEmbeddedObject* renderer = ownerElement->renderEmbeddedObject();
    ASSERT(renderer);
    if (!renderer)
        return false;

    KURL completedURL;
    if (!url.isEmpty())
        completedURL = completeURL(url);

    bool useFallback;
    if (shouldUsePlugin(completedURL, mimeType, ownerElement->shouldPreferPlugInsForImages(), renderer->hasFallbackContent(), useFallback)) {
        bool success = requestPlugin(ownerElement, completedURL, mimeType, paramNames, paramValues, useFallback);
        logPluginRequest(document()->page(), mimeType, completedURL, success);
        return success;
    }

    // If the plug-in element already contains a subframe, loadOrRedirectSubframe will re-use it. Otherwise,
    // it will create a new frame and set it as the RenderPart's widget, causing what was previously 
    // in the widget to be torn down.
    return loadOrRedirectSubframe(ownerElement, completedURL, frameName, true, true);
}