C++ HTMLElement类代码示例

void TextFieldInputType::updatePlaceholderText()
{
    if (!supportsPlaceholder())
        return;
    HTMLElement* placeholder = element().placeholderElement();
    String placeholderText = element().strippedPlaceholder();
    if (placeholderText.isEmpty()) {
        if (placeholder)
            placeholder->remove(ASSERT_NO_EXCEPTION);
        return;
    }
    if (!placeholder) {
        RefPtrWillBeRawPtr<HTMLElement> newElement = HTMLDivElement::create(element().document());
        placeholder = newElement.get();
        placeholder->setShadowPseudoId(AtomicString("-webkit-input-placeholder", AtomicString::ConstructFromLiteral));
        placeholder->setAttribute(idAttr, ShadowElementNames::placeholder());
        Element* container = containerElement();
        Node* previous = container ? container : element().innerEditorElement();
        previous->parentNode()->insertBefore(placeholder, previous->nextSibling());
        ASSERT_WITH_SECURITY_IMPLICATION(placeholder->parentNode() == previous->parentNode());
    }
    placeholder->setTextContent(placeholderText);
}

bool HTMLDocument::isFrameSet() const
{
    HTMLElement* bodyElement = body();
    return bodyElement && bodyElement->renderer() && bodyElement->hasTagName(framesetTag);
}

JSC::JSValue documentEventHandlerAttribute(HTMLElement& element, const AtomicString& eventType)
{
    auto& document = element.document();
    return eventHandlerAttribute(document.getAttributeEventListener(eventType), document);
}

void HTMLSelectElement::add( const HTMLElement &element, const HTMLElement &before )
{
    if(impl) static_cast<HTMLSelectElementImpl*>(impl)->add(
            static_cast<HTMLElementImpl *>(element.handle()), static_cast<HTMLElementImpl *>(before.handle()) );
}

static inline bool nameShouldBeVisibleInDocumentAll(const HTMLElement& element)
{
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#dom-htmlallcollection-nameditem:
    // The document.all collection returns only certain types of elements by name,
    // although it returns any type of element by id.
    return element.hasLocalName(aTag)
        || element.hasLocalName(appletTag)
        || element.hasLocalName(areaTag)
        || element.hasLocalName(embedTag)
        || element.hasLocalName(formTag)
        || element.hasLocalName(frameTag)
        || element.hasLocalName(framesetTag)
        || element.hasLocalName(iframeTag)
        || element.hasLocalName(imgTag)
        || element.hasLocalName(inputTag)
        || element.hasLocalName(objectTag)
        || element.hasLocalName(selectTag);
}

void FormAssociatedElement::insertedIntoDocument()
{
    HTMLElement* element = toHTMLElement(this);
    if (element->fastHasAttribute(formAttr))
        element->document()->registerFormElementWithFormAttribute(this);
}

HTMLBodyElement* HTMLDocument::htmlBodyElement() const
{
    HTMLElement* body = this->body();
    return (body && body->hasTagName(bodyTag)) ? toHTMLBodyElement(body) : 0;
}

void setJSHTMLElementClassName(ExecState* exec, JSObject* thisObject, JSValue value)
{
    JSHTMLElement* castedThis = static_cast<JSHTMLElement*>(thisObject);
    HTMLElement* imp = static_cast<HTMLElement*>(castedThis->impl());
    imp->setAttribute(WebCore::HTMLNames::classAttr, valueToStringWithNullCheck(exec, value));
}

void RenderPartObject::updateWidget(bool onlyCreateNonNetscapePlugins)
{
  String url;
  String serviceType;
  Vector<String> paramNames;
  Vector<String> paramValues;
  Frame* frame = m_view->frame();
  
  if (element()->hasTagName(objectTag)) {

      HTMLObjectElement* o = static_cast<HTMLObjectElement*>(element());

      o->setNeedWidgetUpdate(false);
      if (!o->isFinishedParsingChildren())
        return;
      // Check for a child EMBED tag.
      HTMLEmbedElement* embed = 0;
      for (Node* child = o->firstChild(); child;) {
          if (child->hasTagName(embedTag)) {
              embed = static_cast<HTMLEmbedElement*>(child);
              break;
          } else if (child->hasTagName(objectTag))
              child = child->nextSibling();         // Don't descend into nested OBJECT tags
          else
              child = child->traverseNextNode(o);   // Otherwise descend (EMBEDs may be inside COMMENT tags)
      }
      
      // Use the attributes from the EMBED tag instead of the OBJECT tag including WIDTH and HEIGHT.
      HTMLElement *embedOrObject;
      if (embed) {
          embedOrObject = (HTMLElement *)embed;
          url = embed->url();
          serviceType = embed->serviceType();
      } else
          embedOrObject = (HTMLElement *)o;
      
      // If there was no URL or type defined in EMBED, try the OBJECT tag.
      if (url.isEmpty())
          url = o->m_url;
      if (serviceType.isEmpty())
          serviceType = o->m_serviceType;
      
      HashSet<StringImpl*, CaseFoldingHash> uniqueParamNames;
      
      // Scan the PARAM children.
      // Get the URL and type from the params if we don't already have them.
      // Get the attributes from the params if there is no EMBED tag.
      Node *child = o->firstChild();
      while (child && (url.isEmpty() || serviceType.isEmpty() || !embed)) {
          if (child->hasTagName(paramTag)) {
              HTMLParamElement* p = static_cast<HTMLParamElement*>(child);
              String name = p->name().lower();
              if (url.isEmpty() && (name == "src" || name == "movie" || name == "code" || name == "url"))
                  url = p->value();
              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;

//.........这里部分代码省略.........

static inline bool isPluginElement(HTMLElement& element)
{
    return element.hasTagName(objectTag) || element.hasTagName(embedTag) || element.hasTagName(appletTag);
}

void InsertListCommand::doApply()
{
    if (endingSelection().isNone())
        return;
    
    if (!endingSelection().rootEditableElement())
        return;
    
    VisiblePosition visibleEnd = endingSelection().visibleEnd();
    VisiblePosition visibleStart = endingSelection().visibleStart();
    // When a selection ends at the start of a paragraph, we rarely paint 
    // the selection gap before that paragraph, because there often is no gap.  
    // In a case like this, it's not obvious to the user that the selection 
    // ends "inside" that paragraph, so it would be confusing if InsertUn{Ordered}List 
    // operated on that paragraph.
    // FIXME: We paint the gap before some paragraphs that are indented with left 
    // margin/padding, but not others.  We should make the gap painting more consistent and 
    // then use a left margin/padding rule here.
    if (visibleEnd != visibleStart && isStartOfParagraph(visibleEnd))
        setEndingSelection(VisibleSelection(visibleStart, visibleEnd.previous(true)));

    if (endingSelection().isRange() && modifyRange())
        return;
    
    // FIXME: This will produce unexpected results for a selection that starts just before a
    // table and ends inside the first cell, selectionForParagraphIteration should probably
    // be renamed and deployed inside setEndingSelection().
    Node* selectionNode = endingSelection().start().node();
    const QualifiedName listTag = (m_type == OrderedList) ? olTag : ulTag;
    Node* listChildNode = enclosingListChild(selectionNode);
    bool switchListType = false;
    if (listChildNode) {
        // Remove the list chlild.
        HTMLElement* listNode = enclosingList(listChildNode);
        if (!listNode)
            listNode = fixOrphanedListChild(listChildNode);
        if (!listNode->hasTagName(listTag))
            // listChildNode will be removed from the list and a list of type m_type will be created.
            switchListType = true;
        Node* nextListChild;
        Node* previousListChild;
        VisiblePosition start;
        VisiblePosition end;
        if (listChildNode->hasTagName(liTag)) {
            start = firstDeepEditingPositionForNode(listChildNode);
            end = lastDeepEditingPositionForNode(listChildNode);
            nextListChild = listChildNode->nextSibling();
            previousListChild = listChildNode->previousSibling();
        } else {
            // A paragraph is visually a list item minus a list marker.  The paragraph will be moved.
            start = startOfParagraph(endingSelection().visibleStart());
            end = endOfParagraph(endingSelection().visibleEnd());
            nextListChild = enclosingListChild(end.next().deepEquivalent().node());
            ASSERT(nextListChild != listChildNode);
            if (enclosingList(nextListChild) != listNode)
                nextListChild = 0;
            previousListChild = enclosingListChild(start.previous().deepEquivalent().node());
            ASSERT(previousListChild != listChildNode);
            if (enclosingList(previousListChild) != listNode)
                previousListChild = 0;
        }
        // When removing a list, we must always create a placeholder to act as a point of insertion
        // for the list content being removed.
        RefPtr<Element> placeholder = createBreakElement(document());
        RefPtr<Element> nodeToInsert = placeholder;
        // If the content of the list item will be moved into another list, put it in a list item
        // so that we don't create an orphaned list child.
        if (enclosingList(listNode)) {
            nodeToInsert = createListItemElement(document());
            appendNode(placeholder, nodeToInsert);
        }
        
        if (nextListChild && previousListChild) {
            // We want to pull listChildNode out of listNode, and place it before nextListChild 
            // and after previousListChild, so we split listNode and insert it between the two lists.  
            // But to split listNode, we must first split ancestors of listChildNode between it and listNode,
            // if any exist.
            // FIXME: We appear to split at nextListChild as opposed to listChildNode so that when we remove
            // listChildNode below in moveParagraphs, previousListChild will be removed along with it if it is 
            // unrendered. But we ought to remove nextListChild too, if it is unrendered.
            splitElement(listNode, splitTreeToNode(nextListChild, listNode));
            insertNodeBefore(nodeToInsert, listNode);
        } else if (nextListChild || listChildNode->parentNode() != listNode) {
            // Just because listChildNode has no previousListChild doesn't mean there isn't any content
            // in listNode that comes before listChildNode, as listChildNode could have ancestors
            // between it and listNode. So, we split up to listNode before inserting the placeholder
            // where we're about to move listChildNode to.
            if (listChildNode->parentNode() != listNode)
                splitElement(listNode, splitTreeToNode(listChildNode, listNode).get());
            insertNodeBefore(nodeToInsert, listNode);
        } else
            insertNodeAfter(nodeToInsert, listNode);
        
        VisiblePosition insertionPoint = VisiblePosition(Position(placeholder.get(), 0));
        moveParagraphs(start, end, insertionPoint, true);
    }
    if (!listChildNode || switchListType || m_forceCreateList) {
        // Create list.
        VisiblePosition originalStart = endingSelection().visibleStart();
        VisiblePosition start = startOfParagraph(originalStart);
//.........这里部分代码省略.........

void HTMLDocument::setBody(const HTMLElement &_body)
{
    if (!impl) return;
    ((HTMLDocumentImpl *)impl)->setBody(static_cast<HTMLElementImpl *>(_body.handle()));
    return;
}

void FormAssociatedElement::didMoveToNewDocument(Document* oldDocument)
{
    HTMLElement* element = toHTMLElement(this);
    if (oldDocument && element->fastHasAttribute(formAttr))
        oldDocument->unregisterFormElementWithFormAttribute(this);
}

void setJSHTMLElementTabIndex(ExecState* exec, JSObject* thisObject, JSValue value)
{
    JSHTMLElement* castedThis = static_cast<JSHTMLElement*>(thisObject);
    HTMLElement* imp = static_cast<HTMLElement*>(castedThis->impl());
    imp->setTabIndex(value.toInt32(exec));
}

void setJSHTMLElementHidden(ExecState* exec, JSObject* thisObject, JSValue value)
{
    JSHTMLElement* castedThis = static_cast<JSHTMLElement*>(thisObject);
    HTMLElement* imp = static_cast<HTMLElement*>(castedThis->impl());
    imp->setBooleanAttribute(WebCore::HTMLNames::hiddenAttr, value.toBoolean(exec));
}