C++ Document::LocalizationLinkRemoved方法代码示例

void HTMLLinkElement::UnbindFromTree(bool aDeep, bool aNullParent) {
  // Cancel any DNS prefetches
  // Note: Must come before ResetLinkState.  If called after, it will recreate
  // mCachedURI based on data that is invalid - due to a call to GetHostname.
  CancelDNSPrefetch(HTML_LINK_DNS_PREFETCH_DEFERRED,
                    HTML_LINK_DNS_PREFETCH_REQUESTED);
  CancelPrefetchOrPreload();

  // Without removing the link state we risk a dangling pointer
  // in the mStyledLinks hashtable
  Link::ResetLinkState(false, Link::ElementHasHref());

  // If this is reinserted back into the document it will not be
  // from the parser.
  Document* oldDoc = GetUncomposedDoc();
  ShadowRoot* oldShadowRoot = GetContainingShadow();

  // We want to update the localization but only if the
  // link is removed from a DOM change, and not
  // because the document is going away.
  bool ignore;
  if (oldDoc && oldDoc->GetScriptHandlingObject(ignore) &&
      this->AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel,
                        nsGkAtoms::localization, eIgnoreCase)) {
    oldDoc->LocalizationLinkRemoved(this);
  }

  CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMLinkRemoved"));
  nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);

  Unused << UpdateStyleSheetInternal(oldDoc, oldShadowRoot);
}

nsresult HTMLLinkElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
                                       const nsAttrValue* aValue,
                                       const nsAttrValue* aOldValue,
                                       nsIPrincipal* aSubjectPrincipal,
                                       bool aNotify) {
  // It's safe to call ResetLinkState here because our new attr value has
  // already been set or unset.  ResetLinkState needs the updated attribute
  // value because notifying the document that content states have changed will
  // call IntrinsicState, which will try to get updated information about the
  // visitedness from Link.
  if (aName == nsGkAtoms::href && kNameSpaceID_None == aNameSpaceID) {
    bool hasHref = aValue;
    Link::ResetLinkState(!!aNotify, hasHref);
    if (IsInUncomposedDoc()) {
      CreateAndDispatchEvent(OwnerDoc(), NS_LITERAL_STRING("DOMLinkChanged"));
    }
  }

  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::href) {
    mTriggeringPrincipal = nsContentUtils::GetAttrTriggeringPrincipal(
        this, aValue ? aValue->GetStringValue() : EmptyString(),
        aSubjectPrincipal);
  }

  // If a link's `rel` attribute was changed from or to `localization`,
  // update the list of localization links.
  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::rel) {
    Document* doc = GetComposedDoc();
    if (doc) {
      if ((aValue && aValue->Equals(nsGkAtoms::localization, eIgnoreCase)) &&
          (!aOldValue ||
           !aOldValue->Equals(nsGkAtoms::localization, eIgnoreCase))) {
        doc->LocalizationLinkAdded(this);
      } else if ((aOldValue &&
                  aOldValue->Equals(nsGkAtoms::localization, eIgnoreCase)) &&
                 (!aValue ||
                  !aValue->Equals(nsGkAtoms::localization, eIgnoreCase))) {
        doc->LocalizationLinkRemoved(this);
      }
    }
  }

  // If the link has `rel=localization` and its `href` attribute is changed,
  // update the list of localization links.
  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::href &&
      AttrValueIs(kNameSpaceID_None, nsGkAtoms::rel, nsGkAtoms::localization,
                  eIgnoreCase)) {
    Document* doc = GetComposedDoc();
    if (doc) {
      if (aOldValue) {
        doc->LocalizationLinkRemoved(this);
      }
      if (aValue) {
        doc->LocalizationLinkAdded(this);
      }
    }
  }

  if (aValue) {
    if (aNameSpaceID == kNameSpaceID_None &&
        (aName == nsGkAtoms::href || aName == nsGkAtoms::rel ||
         aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
         aName == nsGkAtoms::type || aName == nsGkAtoms::as ||
         aName == nsGkAtoms::crossorigin)) {
      bool dropSheet = false;
      if (aName == nsGkAtoms::rel) {
        nsAutoString value;
        aValue->ToString(value);
        uint32_t linkTypes = nsStyleLinkElement::ParseLinkTypes(value);
        if (GetSheet()) {
          dropSheet = !(linkTypes & nsStyleLinkElement::eSTYLESHEET);
        }
      }

      if ((aName == nsGkAtoms::rel || aName == nsGkAtoms::href) &&
          IsInComposedDoc()) {
        TryDNSPrefetchOrPreconnectOrPrefetchOrPreloadOrPrerender();
      }

      if ((aName == nsGkAtoms::as || aName == nsGkAtoms::type ||
           aName == nsGkAtoms::crossorigin || aName == nsGkAtoms::media) &&
          IsInComposedDoc()) {
        UpdatePreload(aName, aValue, aOldValue);
      }

      const bool forceUpdate = dropSheet || aName == nsGkAtoms::title ||
                               aName == nsGkAtoms::media ||
                               aName == nsGkAtoms::type;

      Unused << UpdateStyleSheetInternal(
          nullptr, nullptr, forceUpdate ? ForceUpdate::Yes : ForceUpdate::No);
    }
  } else {
    // Since removing href or rel makes us no longer link to a
    // stylesheet, force updates for those too.
    if (aNameSpaceID == kNameSpaceID_None) {
      if (aName == nsGkAtoms::href || aName == nsGkAtoms::rel ||
          aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
          aName == nsGkAtoms::type) {
        Unused << UpdateStyleSheetInternal(nullptr, nullptr, ForceUpdate::Yes);
//.........这里部分代码省略.........