C++ HTMLImageElement::ClearForm方法代码示例

void
nsNodeUtils::LastRelease(nsINode* aNode)
{
  nsINode::nsSlots* slots = aNode->GetExistingSlots();
  if (slots) {
    if (!slots->mMutationObservers.IsEmpty()) {
      NS_OBSERVER_ARRAY_NOTIFY_OBSERVERS(slots->mMutationObservers,
                                         nsIMutationObserver,
                                         NodeWillBeDestroyed, (aNode));
    }

    delete slots;
    aNode->mSlots = nullptr;
  }

  // Kill properties first since that may run external code, so we want to
  // be in as complete state as possible at that time.
  if (aNode->IsNodeOfType(nsINode::eDOCUMENT)) {
    // Delete all properties before tearing down the document. Some of the
    // properties are bound to nsINode objects and the destructor functions of
    // the properties may want to use the owner document of the nsINode.
    static_cast<nsIDocument*>(aNode)->DeleteAllProperties();
  }
  else {
    if (aNode->HasProperties()) {
      // Strong reference to the document so that deleting properties can't
      // delete the document.
      nsCOMPtr<nsIDocument> document = aNode->OwnerDoc();
      document->DeleteAllPropertiesFor(aNode);
    }

    // I wonder whether it's faster to do the HasFlag check first....
    if (aNode->IsNodeOfType(nsINode::eHTML_FORM_CONTROL) &&
        aNode->HasFlag(ADDED_TO_FORM)) {
      // Tell the form (if any) this node is going away.  Don't
      // notify, since we're being destroyed in any case.
      static_cast<nsGenericHTMLFormElement*>(aNode)->ClearForm(true);
    }

    if (aNode->IsHTMLElement(nsGkAtoms::img) &&
        aNode->HasFlag(ADDED_TO_FORM)) {
      HTMLImageElement* imageElem = static_cast<HTMLImageElement*>(aNode);
      imageElem->ClearForm(true);
    }
  }
  aNode->UnsetFlags(NODE_HAS_PROPERTIES);

  if (aNode->NodeType() != nsIDOMNode::DOCUMENT_NODE &&
      aNode->HasFlag(NODE_HAS_LISTENERMANAGER)) {
#ifdef DEBUG
    if (nsContentUtils::IsInitialized()) {
      EventListenerManager* manager =
        nsContentUtils::GetExistingListenerManagerForNode(aNode);
      if (!manager) {
        NS_ERROR("Huh, our bit says we have a listener manager list, "
                 "but there's nothing in the hash!?!!");
      }
    }
#endif

    nsContentUtils::RemoveListenerManager(aNode);
    aNode->UnsetFlags(NODE_HAS_LISTENERMANAGER);
  }

  if (aNode->IsElement()) {
    nsIDocument* ownerDoc = aNode->OwnerDoc();
    Element* elem = aNode->AsElement();
    ownerDoc->ClearBoxObjectFor(elem);

    NS_ASSERTION(aNode->HasFlag(NODE_FORCE_XBL_BINDINGS) ||
                 !elem->GetXBLBinding(),
                 "Non-forced node has binding on destruction");

    // if NODE_FORCE_XBL_BINDINGS is set, the node might still have a binding
    // attached
    if (aNode->HasFlag(NODE_FORCE_XBL_BINDINGS) &&
        ownerDoc->BindingManager()) {
      ownerDoc->BindingManager()->RemovedFromDocument(elem, ownerDoc);
    }
  }

  aNode->ReleaseWrapper(aNode);

  FragmentOrElement::RemoveBlackMarkedNode(aNode);
}