C++ HTMLObjectElement::renderFallbackContent方法代码示例

//.........这里部分代码省略.........
              if (serviceType.isEmpty() && name == "type") {
                  serviceType = p->value();
                  int pos = serviceType.find(";");
                  if (pos != -1)
                      serviceType = serviceType.left(pos);
              }
              if (!embed && !name.isEmpty()) {
                  uniqueParamNames.add(p->name().impl());
                  paramNames.append(p->name());
                  paramValues.append(p->value());
              }
          }
          child = child->nextSibling();
      }
      
      // When OBJECT is used for an applet via Sun's Java plugin, the CODEBASE attribute in the tag
      // points to the Java plugin itself (an ActiveX component) while the actual applet CODEBASE is
      // in a PARAM tag. See <http://java.sun.com/products/plugin/1.2/docs/tags.html>. This means
      // we have to explicitly suppress the tag's CODEBASE attribute if there is none in a PARAM,
      // else our Java plugin will misinterpret it. [4004531]
      String codebase;
      if (!embed && MIMETypeRegistry::isJavaAppletMIMEType(serviceType)) {
          codebase = "codebase";
          uniqueParamNames.add(codebase.impl()); // pretend we found it in a PARAM already
      }
      
      // Turn the attributes of either the EMBED tag or OBJECT tag into arrays, but don't override PARAM values.
      NamedAttrMap* attributes = embedOrObject->attributes();
      if (attributes) {
          for (unsigned i = 0; i < attributes->length(); ++i) {
              Attribute* it = attributes->attributeItem(i);
              const AtomicString& name = it->name().localName();
              if (embed || !uniqueParamNames.contains(name.impl())) {
                  paramNames.append(name.string());
                  paramValues.append(it->value().string());
              }
          }
      }
      
      // If we still don't have a type, try to map from a specific CLASSID to a type.
      if (serviceType.isEmpty() && !o->m_classId.isEmpty())
          mapClassIdToServiceType(o->m_classId, serviceType);
      
      if (!isURLAllowed(document(), url))
          return;

      // Find out if we support fallback content.
      m_hasFallbackContent = false;
      for (Node *child = o->firstChild(); child && !m_hasFallbackContent; child = child->nextSibling()) {
          if ((!child->isTextNode() && !child->hasTagName(embedTag) && !child->hasTagName(paramTag)) || // Discount <embed> and <param>
              (child->isTextNode() && !static_cast<Text*>(child)->containsOnlyWhitespace()))
              m_hasFallbackContent = true;
      }
      
      if (onlyCreateNonNetscapePlugins) {
          KURL completedURL;
          if (!url.isEmpty())
              completedURL = frame->loader()->completeURL(url);
        
          if (frame->loader()->client()->objectContentType(completedURL, serviceType) == ObjectContentNetscapePlugin)
              return;
      }
      
      bool success = frame->loader()->requestObject(this, url, AtomicString(o->name()), serviceType, paramNames, paramValues);
      if (!success && m_hasFallbackContent)
          o->renderFallbackContent();
  } else if (element()->hasTagName(embedTag)) {
      HTMLEmbedElement *o = static_cast<HTMLEmbedElement*>(element());
      o->setNeedWidgetUpdate(false);
      url = o->url();
      serviceType = o->serviceType();

      if (url.isEmpty() && serviceType.isEmpty())
          return;
      if (!isURLAllowed(document(), url))
          return;
      
      // add all attributes set on the embed object
      NamedAttrMap* a = o->attributes();
      if (a) {
          for (unsigned i = 0; i < a->length(); ++i) {
              Attribute* it = a->attributeItem(i);
              paramNames.append(it->name().localName().string());
              paramValues.append(it->value().string());
          }
      }
      
      if (onlyCreateNonNetscapePlugins) {
          KURL completedURL;
          if (!url.isEmpty())
              completedURL = frame->loader()->completeURL(url);
          
          if (frame->loader()->client()->objectContentType(completedURL, serviceType) == ObjectContentNetscapePlugin)
              return;
          
      }
      
      frame->loader()->requestObject(this, url, o->getAttribute(nameAttr), serviceType, paramNames, paramValues);
  }
}

//.........这里部分代码省略.........
            codebase = "codebase";
            uniqueParamNames.add(codebase.impl()); // pretend we found it in a PARAM already
        }
        
        // Turn the attributes of either the EMBED tag or OBJECT tag into arrays, but don't override PARAM values.
        NamedNodeMap* attributes = embedOrObject->attributes();
        if (attributes) {
            for (unsigned i = 0; i < attributes->length(); ++i) {
                Attribute* it = attributes->attributeItem(i);
                const AtomicString& name = it->name().localName();
                if (embed || !uniqueParamNames.contains(name.impl())) {
                    paramNames.append(name.string());
                    paramValues.append(it->value().string());
                }
            }
        }

        mapDataParamToSrc(&paramNames, &paramValues);

        // If we still don't have a type, try to map from a specific CLASSID to a type.
        if (serviceType.isEmpty())
            serviceType = serviceTypeForClassId(objectElement->classId());

        if (!isURLAllowed(document(), url))
            return;

        // Find out if we support fallback content.
        m_hasFallbackContent = false;
        for (Node* child = objectElement->firstChild(); child && !m_hasFallbackContent; child = child->nextSibling()) {
            if ((!child->isTextNode() && !child->hasTagName(embedTag) && !child->hasTagName(paramTag))  // Discount <embed> and <param>
                || (child->isTextNode() && !static_cast<Text*>(child)->containsOnlyWhitespace()))
                m_hasFallbackContent = true;
        }

        if (onlyCreateNonNetscapePlugins) {
            KURL completedURL;
            if (!url.isEmpty())
                completedURL = frame->loader()->completeURL(url);

            if (frame->loader()->client()->objectContentType(completedURL, serviceType) == ObjectContentNetscapePlugin)
                return;
        }

        bool beforeLoadAllowedLoad = objectElement->dispatchBeforeLoadEvent(url);
        
        // beforeload events can modify the DOM, potentially causing
        // RenderWidget::destroy() to be called.  Ensure we haven't been
        // destroyed before continuing.
        if (!node())
            return;
        
        bool success = beforeLoadAllowedLoad && frame->loader()->subframeLoader()->requestObject(this, url, objectElement->getAttribute(nameAttr), serviceType, paramNames, paramValues);
    
        if (!success && m_hasFallbackContent)
            objectElement->renderFallbackContent();

    } else if (node()->hasTagName(embedTag)) {
        HTMLEmbedElement* embedElement = static_cast<HTMLEmbedElement*>(node());
        embedElement->setNeedWidgetUpdate(false);
        url = embedElement->url();
        serviceType = embedElement->serviceType();

        if (url.isEmpty() && serviceType.isEmpty())
            return;
        if (!isURLAllowed(document(), url))
            return;

        // add all attributes set on the embed object
        NamedNodeMap* attributes = embedElement->attributes();
        if (attributes) {
            for (unsigned i = 0; i < attributes->length(); ++i) {
                Attribute* it = attributes->attributeItem(i);
                paramNames.append(it->name().localName().string());
                paramValues.append(it->value().string());
            }
        }

        if (onlyCreateNonNetscapePlugins) {
            KURL completedURL;
            if (!url.isEmpty())
                completedURL = frame->loader()->completeURL(url);

            if (frame->loader()->client()->objectContentType(completedURL, serviceType) == ObjectContentNetscapePlugin)
                return;
        }

        if (embedElement->dispatchBeforeLoadEvent(url))
            frame->loader()->subframeLoader()->requestObject(this, url, embedElement->getAttribute(nameAttr), serviceType, paramNames, paramValues);
    }
#if ENABLE(PLUGIN_PROXY_FOR_VIDEO)        
    else if (node()->hasTagName(videoTag) || node()->hasTagName(audioTag)) {
        HTMLMediaElement* mediaElement = static_cast<HTMLMediaElement*>(node());
        KURL kurl;

        mediaElement->getPluginProxyParams(kurl, paramNames, paramValues);
        mediaElement->setNeedWidgetUpdate(false);
        frame->loader()->subframeLoader()->loadMediaPlayerProxyPlugin(node(), kurl, paramNames, paramValues);
    }
#endif
}