Quelle HTMLAnchorElement.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/HTMLAnchorElement.h"

#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/HTMLAnchorElementBinding.h"
#include "mozilla/dom/HTMLDNSPrefetch.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/MemoryReporting.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsGkAtoms.h"
#include "mozilla/FocusModel.h"
#include "mozilla/dom/Document.h"
#include "nsPresContext.h"
#include "nsIURI.h"
#include "nsWindowSizes.h"

NS_IMPL_NS_NEW_HTML_ELEMENT(Anchor)

namespace mozilla::dom {

HTMLAnchorElement::~HTMLAnchorElement() {
  SupportsDNSPrefetch::Destroyed(*this);
}

bool HTMLAnchorElement::IsInteractiveHTMLContent() const {
  return HasAttr(nsGkAtoms::href) ||
         nsGenericHTMLElement::IsInteractiveHTMLContent();
}

NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(HTMLAnchorElement,
                                             nsGenericHTMLElement, Link)

NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLAnchorElement, nsGenericHTMLElement,
                                   mRelList)

NS_IMPL_ELEMENT_CLONE(HTMLAnchorElement)

JSObject* HTMLAnchorElement::WrapNode(JSContext* aCx,
                                      JS::Handle<JSObject*> aGivenProto) {
  return HTMLAnchorElement_Binding::Wrap(aCx, this, aGivenProto);
}

int32_t HTMLAnchorElement::TabIndexDefault() { return 0; }

bool HTMLAnchorElement::Draggable() const {
  // links can be dragged as long as there is an href and the
  // draggable attribute isn't false
  if (!HasAttr(nsGkAtoms::href)) {
    // no href, so just use the same behavior as other elements
    return nsGenericHTMLElement::Draggable();
  }

  return !AttrValueIs(kNameSpaceID_None, nsGkAtoms::draggable,
                      nsGkAtoms::_false, eIgnoreCase);
}

nsresult HTMLAnchorElement::BindToTree(BindContext& aContext,
                                       nsINode& aParent) {
  nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
  NS_ENSURE_SUCCESS(rv, rv);

  Link::BindToTree(aContext);

  // Prefetch links
  MaybeTryDNSPrefetch();
  return rv;
}

void HTMLAnchorElement::UnbindFromTree(UnbindContext& aContext) {
  // 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 Link::GetURI()
  // via GetURIForDNSPrefetch().
  CancelDNSPrefetch(*this);

  nsGenericHTMLElement::UnbindFromTree(aContext);

  // Without removing the link state we risk a dangling pointer in the
  // mStyledLinks hashtable
  Link::UnbindFromTree();
}

bool HTMLAnchorElement::IsHTMLFocusable(IsFocusableFlags aFlags,
                                        bool* aIsFocusable,
                                        int32_t* aTabIndex) {
  if (nsGenericHTMLElement::IsHTMLFocusable(aFlags, aIsFocusable, aTabIndex)) {
    return true;
  }

  // cannot focus links if there is no link handler
  if (!OwnerDoc()->LinkHandlingEnabled()) {
    *aTabIndex = -1;
    *aIsFocusable = false;
    return false;
  }

  // Links that are in an editable region should never be focusable, even if
  // they are in a contenteditable="false" region.
  if (nsContentUtils::IsNodeInEditableRegion(this)) {
    *aTabIndex = -1;
    *aIsFocusable = false;
    return true;
  }

  if (GetTabIndexAttrValue().isNothing()) {
    // check whether we're actually a link
    if (!IsLink()) {
      // Not tabbable or focusable without href (bug 17605), unless
      // forced to be via presence of nonnegative tabindex attribute
      *aTabIndex = -1;
      *aIsFocusable = false;
      return false;
    }
  }

  if (!FocusModel::IsTabFocusable(TabFocusableType::Links)) {
    *aTabIndex = -1;
  }
  *aIsFocusable = true;
  return false;
}

void HTMLAnchorElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
  GetEventTargetParentForAnchors(aVisitor);
}

nsresult HTMLAnchorElement::PostHandleEvent(EventChainPostVisitor& aVisitor) {
  return PostHandleEventForAnchors(aVisitor);
}

void HTMLAnchorElement::GetLinkTargetImpl(nsAString& aTarget) {
  GetAttr(nsGkAtoms::target, aTarget);
  if (aTarget.IsEmpty()) {
    GetBaseTarget(aTarget);
  }
}

void HTMLAnchorElement::GetTarget(nsAString& aValue) const {
  if (!GetAttr(nsGkAtoms::target, aValue)) {
    GetBaseTarget(aValue);
  }
}

nsDOMTokenList* HTMLAnchorElement::RelList() {
  if (!mRelList) {
    mRelList =
        new nsDOMTokenList(this, nsGkAtoms::rel, sAnchorAndFormRelValues);
  }
  return mRelList;
}

void HTMLAnchorElement::GetText(nsAString& aText,
                                mozilla::ErrorResult& aRv) const {
  if (NS_WARN_IF(
          !nsContentUtils::GetNodeTextContent(this, true, aText, fallible))) {
    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
  }
}

void HTMLAnchorElement::SetText(const nsAString& aText, ErrorResult& aRv) {
  aRv = nsContentUtils::SetNodeTextContent(this, aText, false);
}

already_AddRefed<nsIURI> HTMLAnchorElement::GetHrefURI() const {
  if (nsCOMPtr<nsIURI> uri = GetCachedURI()) {
    return uri.forget();
  }
  return GetHrefURIForAnchors();
}

void HTMLAnchorElement::BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName,
                                      const nsAttrValue* aValue, bool aNotify) {
  if (aNamespaceID == kNameSpaceID_None && aName == nsGkAtoms::href) {
    CancelDNSPrefetch(*this);
  }
  return nsGenericHTMLElement::BeforeSetAttr(aNamespaceID, aName, aValue,
                                             aNotify);
}

void HTMLAnchorElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
                                     const nsAttrValue* aValue,
                                     const nsAttrValue* aOldValue,
                                     nsIPrincipal* aSubjectPrincipal,
                                     bool aNotify) {
  if (aNamespaceID == kNameSpaceID_None) {
    if (aName == nsGkAtoms::href) {
      Link::ResetLinkState(aNotify, !!aValue);
      if (aValue) {
        MaybeTryDNSPrefetch();
      }
    }
  }

  return nsGenericHTMLElement::AfterSetAttr(
      aNamespaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
}

void HTMLAnchorElement::AddSizeOfExcludingThis(nsWindowSizes& aSizes,
                                               size_t* aNodeSize) const {
  nsGenericHTMLElement::AddSizeOfExcludingThis(aSizes, aNodeSize);
  *aNodeSize += Link::SizeOfExcludingThis(aSizes.mState);
}

void HTMLAnchorElement::MaybeTryDNSPrefetch() {
  if (IsInComposedDoc()) {
    nsIURI* docURI = OwnerDoc()->GetDocumentURI();
    if (!docURI) {
      return;
    }

    bool docIsHttps = docURI->SchemeIs("https");
    if ((docIsHttps &&
         StaticPrefs::dom_prefetch_dns_for_anchor_https_document()) ||
        (!docIsHttps &&
         StaticPrefs::dom_prefetch_dns_for_anchor_http_document())) {
      TryDNSPrefetch(
          *this, HTMLDNSPrefetch::PrefetchSource::AnchorSpeculativePrefetch);
    }
  }
}

}  // namespace mozilla::dom

quality100%

¤ Dauer der Verarbeitung: 0.12 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.