C++ HasAttr函数代码示例

EventStates
HTMLTextAreaElement::IntrinsicState() const
{
  EventStates state = nsGenericHTMLFormElementWithState::IntrinsicState();

  if (HasAttr(kNameSpaceID_None, nsGkAtoms::required)) {
    state |= NS_EVENT_STATE_REQUIRED;
  } else {
    state |= NS_EVENT_STATE_OPTIONAL;
  }

  if (IsCandidateForConstraintValidation()) {
    if (IsValid()) {
      state |= NS_EVENT_STATE_VALID;
    } else {
      state |= NS_EVENT_STATE_INVALID;
      // :-moz-ui-invalid always apply if the element suffers from a custom
      // error and never applies if novalidate is set on the form owner.
      if ((!mForm || !mForm->HasAttr(kNameSpaceID_None, nsGkAtoms::novalidate)) &&
          (GetValidityState(VALIDITY_STATE_CUSTOM_ERROR) ||
           (mCanShowInvalidUI && ShouldShowValidityUI()))) {
        state |= NS_EVENT_STATE_MOZ_UI_INVALID;
      }
    }

    // :-moz-ui-valid applies if all the following are true:
    // 1. The element is not focused, or had either :-moz-ui-valid or
    //    :-moz-ui-invalid applying before it was focused ;
    // 2. The element is either valid or isn't allowed to have
    //    :-moz-ui-invalid applying ;
    // 3. The element has no form owner or its form owner doesn't have the
    //    novalidate attribute set ;
    // 4. The element has already been modified or the user tried to submit the
    //    form owner while invalid.
    if ((!mForm || !mForm->HasAttr(kNameSpaceID_None, nsGkAtoms::novalidate)) &&
        (mCanShowValidUI && ShouldShowValidityUI() &&
         (IsValid() || (state.HasState(NS_EVENT_STATE_MOZ_UI_INVALID) &&
                        !mCanShowInvalidUI)))) {
      state |= NS_EVENT_STATE_MOZ_UI_VALID;
    }
  }

  if (HasAttr(kNameSpaceID_None, nsGkAtoms::placeholder) &&
      IsValueEmpty()) {
    state |= NS_EVENT_STATE_PLACEHOLDERSHOWN;
  }

  return state;
}

nsresult
HTMLImageElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                             nsIContent* aBindingParent,
                             bool aCompileEventHandlers)
{
  nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
                                                 aBindingParent,
                                                 aCompileEventHandlers);
  NS_ENSURE_SUCCESS(rv, rv);

  nsImageLoadingContent::BindToTree(aDocument, aParent, aBindingParent,
                                    aCompileEventHandlers);

  if (aParent) {
    UpdateFormOwner();
  }

  bool haveSrcset = IsSrcsetEnabled() &&
                    HasAttr(kNameSpaceID_None, nsGkAtoms::srcset);
  if (haveSrcset || HasAttr(kNameSpaceID_None, nsGkAtoms::src)) {
    // FIXME: Bug 660963 it would be nice if we could just have
    // ClearBrokenState update our state and do it fast...
    ClearBrokenState();
    RemoveStatesSilently(NS_EVENT_STATE_BROKEN);

    // We don't handle responsive changes when not bound to a tree, update them
    // now if necessary
    if (haveSrcset) {
      nsAutoString srcset;
      GetAttr(kNameSpaceID_None, nsGkAtoms::srcset, srcset);
      UpdateSourceSet(srcset);
      if (mResponsiveSelector) {
        nsAutoString src;
        GetAttr(kNameSpaceID_None, nsGkAtoms::src, src);
        mResponsiveSelector->SetDefaultSource(src);
      }
    }

    // If loading is temporarily disabled, don't even launch MaybeLoadImage.
    // Otherwise MaybeLoadImage may run later when someone has reenabled
    // loading.
    if (LoadingEnabled()) {
      nsContentUtils::AddScriptRunner(
        NS_NewRunnableMethod(this, &HTMLImageElement::MaybeLoadImage));
    }
  }

  return rv;
}

nsresult
SVGIFrameElement::BindToTree(nsIDocument* aDocument,
                             nsIContent* aParent,
                             nsIContent* aBindingParent,
                             bool aCompileEventHandlers)
{
  nsresult rv = nsSVGElement::BindToTree(aDocument, aParent,
                                         aBindingParent,
                                         aCompileEventHandlers);
  NS_ENSURE_SUCCESS(rv, rv);

  if (aDocument) {
    NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
                 "Missing a script blocker!");

    PROFILER_LABEL("SVGIFrameElement", "BindToTree",
      js::ProfileEntry::Category::OTHER);

    // We're in a document now.  Kick off the frame load.
    LoadSrc();

    if (HasAttr(kNameSpaceID_None, nsGkAtoms::sandbox)) {
      if (mFrameLoader) {
        mFrameLoader->ApplySandboxFlags(GetSandboxFlags());
      }
    }
  }

  // We're now in document and scripts may move us, so clear
  // the mNetworkCreated flag.
  mNetworkCreated = false;
  return rv;
}

void
HTMLTextAreaElement::UpdateBarredFromConstraintValidation()
{
  SetBarredFromConstraintValidation(HasAttr(kNameSpaceID_None,
                                            nsGkAtoms::readonly) ||
                                    IsDisabled());
}

void
HTMLScriptElement::FreezeUriAsyncDefer()
{
  if (mFrozen) {
    return;
  }

  // variation of this code in nsSVGScriptElement - check if changes
  // need to be transfered when modifying
  if (HasAttr(kNameSpaceID_None, nsGkAtoms::src)) {
    nsAutoString src;
    GetSrc(src);
    NS_NewURI(getter_AddRefs(mUri), src);
    // At this point mUri will be null for invalid URLs.
    mExternal = true;

    bool defer, async;
    GetAsync(&async);
    GetDefer(&defer);

    mDefer = !async && defer;
    mAsync = async;
  }

  mFrozen = true;
}

// Helper to regenerate our path representation & its list of vertices
void
SVGMotionSMILAnimationFunction::
  RebuildPathAndVertices(const nsIContent* aTargetElement)
{
  NS_ABORT_IF_FALSE(mIsPathStale, "rebuilding path when it isn't stale");

  // Clear stale data
  mPath = nullptr;
  mPathVertices.Clear();
  mPathSourceType = ePathSourceType_None;

  // Do we have a mpath child? if so, it trumps everything. Otherwise, we look
  // through our list of path-defining attributes, in order of priority.
  SVGMPathElement* firstMpathChild = GetFirstMPathChild(mAnimationElement);

  if (firstMpathChild) {
    RebuildPathAndVerticesFromMpathElem(firstMpathChild);
    mValueNeedsReparsingEverySample = false;
  } else if (HasAttr(nsGkAtoms::path)) {
    RebuildPathAndVerticesFromPathAttr();
    mValueNeedsReparsingEverySample = false;
  } else {
    // Get path & vertices from basic SMIL attrs: from/by/to/values

    RebuildPathAndVerticesFromBasicAttrs(aTargetElement);
    mValueNeedsReparsingEverySample = true;
  }
  mIsPathStale = false;
}

nsresult
HTMLImageElement::CopyInnerTo(Element* aDest)
{
  bool destIsStatic = aDest->OwnerDoc()->IsStaticDocument();
  auto dest = static_cast<HTMLImageElement*>(aDest);
  if (destIsStatic) {
    CreateStaticImageClone(dest);
  }

  nsresult rv = nsGenericHTMLElement::CopyInnerTo(aDest);
  if (NS_FAILED(rv)) {
    return rv;
  }

  if (!destIsStatic) {
    // In SetAttr (called from nsGenericHTMLElement::CopyInnerTo), dest skipped
    // doing the image load because we passed in false for aNotify.  But we
    // really do want it to do the load, so set it up to happen once the cloning
    // reaches a stable state.
    if (!dest->InResponsiveMode() &&
        dest->HasAttr(kNameSpaceID_None, nsGkAtoms::src)) {
      nsContentUtils::AddScriptRunner(
        NS_NewRunnableMethod(dest, &HTMLImageElement::MaybeLoadImage));
    }
  }

  return NS_OK;
}

EventStates
HTMLOptionElement::IntrinsicState() const
{
  EventStates state = nsGenericHTMLElement::IntrinsicState();
  if (Selected()) {
    state |= NS_EVENT_STATE_CHECKED;
  }
  if (DefaultSelected()) {
    state |= NS_EVENT_STATE_DEFAULT;
  }

  // An <option> is disabled if it has @disabled set or if it's <optgroup> has
  // @disabled set.
  if (HasAttr(kNameSpaceID_None, nsGkAtoms::disabled)) {
    state |= NS_EVENT_STATE_DISABLED;
    state &= ~NS_EVENT_STATE_ENABLED;
  } else {
    nsIContent* parent = GetParent();
    if (parent && parent->IsHTMLElement(nsGkAtoms::optgroup) &&
        parent->HasAttr(kNameSpaceID_None, nsGkAtoms::disabled)) {
      state |= NS_EVENT_STATE_DISABLED;
      state &= ~NS_EVENT_STATE_ENABLED;
    } else {
      state &= ~NS_EVENT_STATE_DISABLED;
      state |= NS_EVENT_STATE_ENABLED;
    }
  }

  return state;
}

nsresult
HTMLImageElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                             nsIContent* aBindingParent,
                             bool aCompileEventHandlers)
{
  nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
                                                 aBindingParent,
                                                 aCompileEventHandlers);
  NS_ENSURE_SUCCESS(rv, rv);

  nsImageLoadingContent::BindToTree(aDocument, aParent, aBindingParent,
                                    aCompileEventHandlers);

  if (HasAttr(kNameSpaceID_None, nsGkAtoms::src)) {
    // FIXME: Bug 660963 it would be nice if we could just have
    // ClearBrokenState update our state and do it fast...
    ClearBrokenState();
    RemoveStatesSilently(NS_EVENT_STATE_BROKEN);
    // If loading is temporarily disabled, don't even launch MaybeLoadImage.
    // Otherwise MaybeLoadImage may run later when someone has reenabled
    // loading.
    if (LoadingEnabled()) {
      nsContentUtils::AddScriptRunner(
        NS_NewRunnableMethod(this, &HTMLImageElement::MaybeLoadImage));
    }
  }

  return rv;
}

nsresult
SVGMPathElement::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName,
                              const nsAttrValue* aValue,
                              const nsAttrValue* aOldValue,
                              nsIPrincipal* aMaybeScriptedPrincipal,
                              bool aNotify)
{
  if (!aValue && aName == nsGkAtoms::href) {
    // href attr being removed.
    if (aNamespaceID == kNameSpaceID_None) {
      UnlinkHrefTarget(true);

      // After unsetting href, we may still have xlink:href, so we should
      // try to add it back.
      const nsAttrValue* xlinkHref =
        mAttrsAndChildren.GetAttr(nsGkAtoms::href, kNameSpaceID_XLink);
      if (xlinkHref) {
        UpdateHrefTarget(GetParent(), xlinkHref->GetStringValue());
      }
    } else if (aNamespaceID == kNameSpaceID_XLink &&
               !HasAttr(kNameSpaceID_None, nsGkAtoms::href)) {
      UnlinkHrefTarget(true);
    } // else: we unset some random-namespace href attribute, or unset xlink:href
      // but still have href attribute, so keep the target linking to href.
  }

  return SVGMPathElementBase::AfterSetAttr(aNamespaceID, aName,
                                           aValue, aOldValue,
                                           aMaybeScriptedPrincipal, aNotify);
}

void
SVGStyleElement::GetStyleSheetInfo(nsAString& aTitle,
                                   nsAString& aType,
                                   nsAString& aMedia,
                                   bool* aIsScoped,
                                   bool* aIsAlternate)
{
  *aIsAlternate = false;

  nsAutoString title;
  GetAttr(kNameSpaceID_None, nsGkAtoms::title, title);
  title.CompressWhitespace();
  aTitle.Assign(title);

  GetAttr(kNameSpaceID_None, nsGkAtoms::media, aMedia);
  // The SVG spec is formulated in terms of the CSS2 spec,
  // which specifies that media queries are case insensitive.
  nsContentUtils::ASCIIToLower(aMedia);

  GetAttr(kNameSpaceID_None, nsGkAtoms::type, aType);
  if (aType.IsEmpty()) {
    aType.AssignLiteral("text/css");
  }

  *aIsScoped = HasAttr(kNameSpaceID_None, nsGkAtoms::scoped);

  return;
}

void
SVGMotionSMILAnimationFunction::CheckKeyPoints()
{
  if (!HasAttr(nsGkAtoms::keyPoints))
    return;

  // attribute is ignored for calcMode="paced" (even if it's got errors)
  if (GetCalcMode() == CALC_PACED) {
    SetKeyPointsErrorFlag(false);
  }

  if (mKeyPoints.IsEmpty()) {
    // keyPoints attr is set, but array is empty => it failed preliminary checks
    SetKeyPointsErrorFlag(true);
    return;
  }

  // Nothing else to check -- we can catch all keyPoints errors elsewhere.
  // -  Formatting & range issues will be caught in SetKeyPoints, and will
  //  result in an empty mKeyPoints array, which will drop us into the error
  //  case above.
  // -  Number-of-entries issues will be caught in CheckKeyTimes (and flagged
  //  as a problem with |keyTimes|), since we use our keyPoints entries to
  //  populate the "values" list, and that list's count gets passed to
  //  CheckKeyTimes.
}

/*
 * Scale the simple progress, taking into account any keyTimes.
 */
void
nsSMILAnimationFunction::ScaleSimpleProgress(double& aProgress)
{
  if (!HasAttr(nsGkAtoms::keyTimes))
    return;

  PRUint32 numTimes = mKeyTimes.Length();

  if (numTimes < 2)
    return;

  PRUint32 i = 0;
  for (; i < numTimes - 2 && aProgress >= mKeyTimes[i+1]; ++i);

  double& intervalStart = mKeyTimes[i];
  double& intervalEnd   = mKeyTimes[i+1];

  double intervalLength = intervalEnd - intervalStart;
  if (intervalLength <= 0.0) {
    aProgress = intervalStart;
    return;
  }

  aProgress = (i + (aProgress - intervalStart) / intervalLength) *
         1.0 / double(numTimes - 1);
}

bool SVGMotionSMILAnimationFunction::IsToAnimation() const {
  // Rely on inherited method, but not if we have an <mpath> child or a |path|
  // attribute, because they'll override any 'to' attr we might have.
  // NOTE: We can't rely on mPathSourceType, because it might not have been
  // set to a useful value yet (or it might be stale).
  return !GetFirstMPathChild(mAnimationElement) && !HasAttr(nsGkAtoms::path) &&
         SMILAnimationFunction::IsToAnimation();
}

SVGPathElement*
SVGMPathElement::GetReferencedPath()
{
  if (!HasAttr(kNameSpaceID_XLink, nsGkAtoms::href) &&
      !HasAttr(kNameSpaceID_None, nsGkAtoms::href)) {
    MOZ_ASSERT(!mPathTracker.get(),
               "We shouldn't have a href target "
               "if we don't have an xlink:href or href attribute");
    return nullptr;
  }

  nsIContent* genericTarget = mPathTracker.get();
  if (genericTarget && genericTarget->IsSVGElement(nsGkAtoms::path)) {
    return static_cast<SVGPathElement*>(genericTarget);
  }
  return nullptr;
}