Quelle DocumentOrShadowRoot.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 "DocumentOrShadowRoot.h"
#include "mozilla/AnimationComparator.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/PointerLockManager.h"
#include "mozilla/PresShell.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/dom/AnimatableBinding.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/StyleSheetList.h"
#include "nsTHashtable.h"
#include "nsContentUtils.h"
#include "nsFocusManager.h"
#include "nsIFormControl.h"
#include "nsLayoutUtils.h"
#include "nsNameSpaceManager.h"
#include "nsWindowSizes.h"

namespace mozilla::dom {

DocumentOrShadowRoot::DocumentOrShadowRoot(ShadowRoot* aShadowRoot)
    : mAsNode(aShadowRoot), mKind(Kind::ShadowRoot) {
  MOZ_ASSERT(mAsNode);
}

DocumentOrShadowRoot::DocumentOrShadowRoot(Document* aDoc)
    : mAsNode(aDoc), mKind(Kind::Document) {
  MOZ_ASSERT(mAsNode);
}

void DocumentOrShadowRoot::AddSizeOfOwnedSheetArrayExcludingThis(
    nsWindowSizes& aSizes, const nsTArray<RefPtr<StyleSheet>>& aSheets) const {
  size_t n = 0;
  n += aSheets.ShallowSizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
  for (StyleSheet* sheet : aSheets) {
    if (!sheet->GetAssociatedDocumentOrShadowRoot()) {
      // Avoid over-reporting shared sheets.
      continue;
    }
    n += sheet->SizeOfIncludingThis(aSizes.mState.mMallocSizeOf);
  }

  if (mKind == Kind::ShadowRoot) {
    aSizes.mLayoutShadowDomStyleSheetsSize += n;
  } else {
    aSizes.mLayoutStyleSheetsSize += n;
  }
}

void DocumentOrShadowRoot::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const {
  AddSizeOfOwnedSheetArrayExcludingThis(aSizes, mStyleSheets);
  aSizes.mDOMSizes.mDOMOtherSize +=
      mIdentifierMap.SizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
}

DocumentOrShadowRoot::~DocumentOrShadowRoot() {
  for (StyleSheet* sheet : mStyleSheets) {
    sheet->ClearAssociatedDocumentOrShadowRoot();
  }
}

StyleSheetList* DocumentOrShadowRoot::StyleSheets() {
  if (!mDOMStyleSheets) {
    mDOMStyleSheets = new StyleSheetList(*this);
  }
  return mDOMStyleSheets;
}

void DocumentOrShadowRoot::InsertSheetAt(size_t aIndex, StyleSheet& aSheet) {
  aSheet.SetAssociatedDocumentOrShadowRoot(this);
  mStyleSheets.InsertElementAt(aIndex, &aSheet);
}

void DocumentOrShadowRoot::RemoveStyleSheet(StyleSheet& aSheet) {
  auto index = mStyleSheets.IndexOf(&aSheet);
  if (index == mStyleSheets.NoIndex) {
    // We should only hit this case if we are unlinking
    // in which case mStyleSheets should be cleared.
    MOZ_ASSERT(mKind != Kind::Document ||
               AsNode().AsDocument()->InUnlinkOrDeletion());
    MOZ_ASSERT(mStyleSheets.IsEmpty());
    return;
  }
  RefPtr<StyleSheet> sheet = std::move(mStyleSheets[index]);
  mStyleSheets.RemoveElementAt(index);
  RemoveSheetFromStylesIfApplicable(*sheet);
  sheet->ClearAssociatedDocumentOrShadowRoot();
  AsNode().OwnerDoc()->PostStyleSheetRemovedEvent(aSheet);
}

void DocumentOrShadowRoot::RemoveSheetFromStylesIfApplicable(
    StyleSheet& aSheet) {
  if (!aSheet.IsApplicable()) {
    return;
  }
  if (mKind == Kind::Document) {
    AsNode().AsDocument()->RemoveStyleSheetFromStyleSets(aSheet);
  } else {
    MOZ_ASSERT(AsNode().IsShadowRoot());
    static_cast<ShadowRoot&>(AsNode()).RemoveSheetFromStyles(aSheet);
  }
}

// https://drafts.csswg.org/cssom/#dom-documentorshadowroot-adoptedstylesheets
void DocumentOrShadowRoot::OnSetAdoptedStyleSheets(StyleSheet& aSheet,
                                                   uint32_t aIndex,
                                                   ErrorResult& aRv) {
  Document& doc = *AsNode().OwnerDoc();
  // 1. If value’s constructed flag is not set, or its constructor document is
  // not equal to this DocumentOrShadowRoot's node document, throw a
  // "NotAllowedError" DOMException.

  if (!StaticPrefs::
          dom_webcomponents_lift_adoptedstylesheets_restriction_enabled()) {
    if (!aSheet.IsConstructed()) {
      return aRv.ThrowNotAllowedError(
          "Adopted style sheet must be created through the Constructable "
          "StyleSheets API");
    }

    if (!aSheet.ConstructorDocumentMatches(doc)) {
      return aRv.ThrowNotAllowedError(
          "Adopted style sheet's constructor document must match the "
          "document or shadow root's node document");
    }
  }

  auto* shadow = ShadowRoot::FromNode(AsNode());
  MOZ_ASSERT((mKind == Kind::ShadowRoot) == !!shadow);

  auto existingIndex = mAdoptedStyleSheets.LastIndexOf(&aSheet);
  // Ensure it's in the backing array at the right index.
  mAdoptedStyleSheets.InsertElementAt(aIndex, &aSheet);
  if (existingIndex == mAdoptedStyleSheets.NoIndex) {
    // common case: we're not already adopting this sheet.
    aSheet.AddAdopter(*this);
  } else if (existingIndex < aIndex) {
    // We're inserting an already-adopted stylesheet in a later position, so
    // this one should take precedent and we should remove the old one.
    RemoveSheetFromStylesIfApplicable(aSheet);
  } else {
    // The sheet is already at a position later than or equal to the current
    // one, and is already adopted by us, we have nothing to do here other than
    // adding to the current list.
    return;
  }

  if (aSheet.IsApplicable()) {
    if (mKind == Kind::Document) {
      doc.AddStyleSheetToStyleSets(aSheet);
    } else {
      shadow->InsertSheetIntoAuthorData(aIndex, aSheet, mAdoptedStyleSheets);
    }
  }
}

void DocumentOrShadowRoot::OnDeleteAdoptedStyleSheets(StyleSheet& aSheet,
                                                      uint32_t aIndex,
                                                      ErrorResult&) {
  MOZ_ASSERT(mAdoptedStyleSheets.ElementAt(aIndex) == &aSheet);
  mAdoptedStyleSheets.RemoveElementAt(aIndex);
  auto existingIndex = mAdoptedStyleSheets.LastIndexOf(&aSheet);
  if (existingIndex != mAdoptedStyleSheets.NoIndex && existingIndex >= aIndex) {
    // The sheet is still adopted by us and was already later from the one we're
    // removing, so nothing to do.
    return;
  }

  RemoveSheetFromStylesIfApplicable(aSheet);
  if (existingIndex == mAdoptedStyleSheets.NoIndex) {
    // The sheet is no longer adopted by us.
    aSheet.RemoveAdopter(*this);
  } else if (aSheet.IsApplicable()) {
    // We need to re-insert the sheet at the right (pre-existing) index.
    nsINode& node = AsNode();
    if (mKind == Kind::Document) {
      node.AsDocument()->AddStyleSheetToStyleSets(aSheet);
    } else {
      ShadowRoot::FromNode(node)->InsertSheetIntoAuthorData(
          existingIndex, aSheet, mAdoptedStyleSheets);
    }
  }
}

void DocumentOrShadowRoot::ClearAdoptedStyleSheets() {
  auto* shadow = ShadowRoot::FromNode(AsNode());
  auto* doc = shadow ? nullptr : AsNode().AsDocument();
  MOZ_ASSERT(shadow || doc);
  IgnoredErrorResult rv;
  while (!mAdoptedStyleSheets.IsEmpty()) {
    if (shadow) {
      ShadowRoot_Binding::AdoptedStyleSheetsHelpers::RemoveLastElement(shadow,
                                                                       rv);
    } else {
      Document_Binding::AdoptedStyleSheetsHelpers::RemoveLastElement(doc, rv);
    }
    MOZ_DIAGNOSTIC_ASSERT(!rv.Failed(), "Removal doesn't fail");
  }
}

void DocumentOrShadowRoot::CloneAdoptedSheetsFrom(
    const DocumentOrShadowRoot& aSource) {
  if (aSource.mAdoptedStyleSheets.IsEmpty()) {
    return;
  }

  Document& ownerDoc = *AsNode().OwnerDoc();
  const Document& sourceDoc = *aSource.AsNode().OwnerDoc();
  auto* clonedSheetMap = static_cast<Document::AdoptedStyleSheetCloneCache*>(
      sourceDoc.GetProperty(nsGkAtoms::adoptedsheetclones));
  MOZ_ASSERT(clonedSheetMap);

  // We don't need to care about the reflector (AdoptedStyleSheetsHelpers and
  // so) because this is only used for static documents.
  for (const StyleSheet* sheet : aSource.mAdoptedStyleSheets) {
    RefPtr<StyleSheet> clone = clonedSheetMap->LookupOrInsertWith(
        sheet, [&] { return sheet->CloneAdoptedSheet(ownerDoc); });
    MOZ_ASSERT(clone);
    MOZ_DIAGNOSTIC_ASSERT(clone->ConstructorDocumentMatches(ownerDoc));
    ErrorResult rv;
    OnSetAdoptedStyleSheets(*clone, mAdoptedStyleSheets.Length(), rv);
    MOZ_ASSERT(!rv.Failed());
  }
}

Element* DocumentOrShadowRoot::GetElementById(
    const nsAString& aElementId) const {
  if (MOZ_UNLIKELY(aElementId.IsEmpty())) {
    ReportEmptyGetElementByIdArg();
    return nullptr;
  }

  if (IdentifierMapEntry* entry = mIdentifierMap.GetEntry(aElementId)) {
    return entry->GetIdElement();
  }

  return nullptr;
}

Element* DocumentOrShadowRoot::GetElementById(nsAtom* aElementId) const {
  if (MOZ_UNLIKELY(aElementId == nsGkAtoms::_empty)) {
    ReportEmptyGetElementByIdArg();
    return nullptr;
  }

  if (IdentifierMapEntry* entry = mIdentifierMap.GetEntry(aElementId)) {
    return entry->GetIdElement();
  }

  return nullptr;
}

already_AddRefed<nsContentList> DocumentOrShadowRoot::GetElementsByTagNameNS(
    const nsAString& aNamespaceURI, const nsAString& aLocalName) {
  ErrorResult rv;
  RefPtr<nsContentList> list =
      GetElementsByTagNameNS(aNamespaceURI, aLocalName, rv);
  if (rv.Failed()) {
    return nullptr;
  }
  return list.forget();
}

already_AddRefed<nsContentList> DocumentOrShadowRoot::GetElementsByTagNameNS(
    const nsAString& aNamespaceURI, const nsAString& aLocalName,
    ErrorResult& aResult) {
  int32_t nameSpaceId = kNameSpaceID_Wildcard;

  if (!aNamespaceURI.EqualsLiteral("*")) {
    aResult = nsNameSpaceManager::GetInstance()->RegisterNameSpace(
        aNamespaceURI, nameSpaceId);
    if (aResult.Failed()) {
      return nullptr;
    }
  }

  NS_ASSERTION(nameSpaceId != kNameSpaceID_Unknown, "Unexpected namespace ID!");
  return NS_GetContentList(&AsNode(), nameSpaceId, aLocalName);
}

already_AddRefed<nsContentList> DocumentOrShadowRoot::GetElementsByClassName(
    const nsAString& aClasses) {
  return nsContentUtils::GetElementsByClassName(&AsNode(), aClasses);
}

nsINode* DocumentOrShadowRoot::Retarget(nsINode* aNode) const {
  for (nsINode* cur = aNode; cur; cur = cur->GetContainingShadowHost()) {
    if (cur->SubtreeRoot() == &AsNode()) {
      return cur;
    }
  }
  return nullptr;
}

Element* DocumentOrShadowRoot::GetRetargetedFocusedElement() {
  auto* content = AsNode().OwnerDoc()->GetUnretargetedFocusedContent();
  if (!content) {
    return nullptr;
  }
  if (nsINode* retarget = Retarget(content)) {
    return retarget->AsElement();
  }
  return nullptr;
}

Element* DocumentOrShadowRoot::GetPointerLockElement() {
  nsCOMPtr<Element> pointerLockedElement =
      PointerLockManager::GetLockedElement();
  return Element::FromNodeOrNull(Retarget(pointerLockedElement));
}

Element* DocumentOrShadowRoot::GetFullscreenElement() const {
  if (!AsNode().IsInComposedDoc()) {
    return nullptr;
  }

  Element* element = AsNode().OwnerDoc()->GetUnretargetedFullscreenElement();
  NS_ASSERTION(!element || element->State().HasState(ElementState::FULLSCREEN),
               "Fullscreen element should have fullscreen styles applied");
  return Element::FromNodeOrNull(Retarget(element));
}

namespace {

using FrameForPointOption = nsLayoutUtils::FrameForPointOption;
using FrameForPointOptions = nsLayoutUtils::FrameForPointOptions;

// Whether only one node or multiple nodes is requested.
enum class Multiple {
  No,
  Yes,
};

// Whether we should flush layout or not.
enum class FlushLayout {
  No,
  Yes,
};

enum class PerformRetargeting {
  No,
  Yes,
};

template <typename NodeOrElement>
NodeOrElement* CastTo(nsINode*);

template <>
Element* CastTo<Element>(nsINode* aNode) {
  return aNode->AsElement();
}

template <>
nsINode* CastTo<nsINode>(nsINode* aNode) {
  return aNode;
}

template <typename NodeOrElement>
static void QueryNodesFromRect(DocumentOrShadowRoot& aRoot, const nsRect& aRect,
                               FrameForPointOptions aOptions,
                               FlushLayout aShouldFlushLayout,
                               Multiple aMultiple, ViewportType aViewportType,
                               PerformRetargeting aPerformRetargeting,
                               nsTArray<RefPtr<NodeOrElement>>& aNodes) {
  static_assert(std::is_same<nsINode, NodeOrElement>::value ||
                    std::is_same<Element, NodeOrElement>::value,
                "Should returning nodes or elements");

  constexpr bool returningElements =
      std::is_same<Element, NodeOrElement>::value;
  const bool retargeting = aPerformRetargeting == PerformRetargeting::Yes;

  nsCOMPtr<Document> doc = aRoot.AsNode().OwnerDoc();

  // Make sure the layout information we get is up-to-date, and
  // ensure we get a root frame (for everything but XUL)
  if (aShouldFlushLayout == FlushLayout::Yes) {
    doc->FlushPendingNotifications(FlushType::Layout);
  }

  PresShell* presShell = doc->GetPresShell();
  if (!presShell) {
    return;
  }

  nsIFrame* rootFrame = presShell->GetRootFrame();
  // XUL docs, unlike HTML, have no frame tree until everything's done loading
  if (!rootFrame) {
    return;  // return null to premature XUL callers as a reminder to wait
  }

  aOptions.mBits += FrameForPointOption::IgnorePaintSuppression;
  aOptions.mBits += FrameForPointOption::IgnoreCrossDoc;

  AutoTArray<nsIFrame*, 8> frames;
  nsLayoutUtils::GetFramesForArea({rootFrame, aViewportType}, aRect, frames,
                                  aOptions);

  for (nsIFrame* frame : frames) {
    nsINode* node = doc->GetContentInThisDocument(frame);
    while (node && node->IsInNativeAnonymousSubtree()) {
      nsIContent* root = node->GetClosestNativeAnonymousSubtreeRoot();
      MOZ_ASSERT(root, "content is connected");
      MOZ_ASSERT(root->IsRootOfNativeAnonymousSubtree(), "wat");
      if (root == &aRoot.AsNode()) {
        // If we're in the anonymous subtree root we care about, don't retarget.
        break;
      }
      node = root->GetParentOrShadowHostNode();
    }

    if (!node) {
      continue;
    }

    if (returningElements && !node->IsElement()) {
      // If this helper is called via ElementsFromPoint, we need to make sure
      // our frame is an element. Otherwise return whatever the top frame is
      // even if it isn't the top-painted element.
      // SVG 'text' element's SVGTextFrame doesn't respond to hit-testing, so
      // if 'content' is a child of such an element then we need to manually
      // defer to the parent here.
      if (aMultiple == Multiple::Yes && !frame->IsInSVGTextSubtree()) {
        continue;
      }

      node = node->GetParent();
      if (ShadowRoot* shadow = ShadowRoot::FromNodeOrNull(node)) {
        node = shadow->Host();
      }
    }

    // XXXsmaug There is plenty of unspec'ed behavior here
    //         https://github.com/w3c/webcomponents/issues/735
    //         https://github.com/w3c/webcomponents/issues/736
    if (retargeting) {
      node = aRoot.Retarget(node);
    }

    if (node && node != aNodes.SafeLastElement(nullptr)) {
      aNodes.AppendElement(CastTo<NodeOrElement>(node));
      if (aMultiple == Multiple::No) {
        return;
      }
    }
  }
}

template <typename NodeOrElement>
static void QueryNodesFromPoint(DocumentOrShadowRoot& aRoot, float aX, float aY,
                                FrameForPointOptions aOptions,
                                FlushLayout aShouldFlushLayout,
                                Multiple aMultiple, ViewportType aViewportType,
                                PerformRetargeting aPerformRetargeting,
                                nsTArray<RefPtr<NodeOrElement>>& aNodes) {
  // As per the spec, we return null if either coord is negative.
  if (!aOptions.mBits.contains(FrameForPointOption::IgnoreRootScrollFrame) &&
      (aX < 0 || aY < 0)) {
    return;
  }

  nscoord x = nsPresContext::CSSPixelsToAppUnits(aX);
  nscoord y = nsPresContext::CSSPixelsToAppUnits(aY);
  nsPoint pt(x, y);
  QueryNodesFromRect(aRoot, nsRect(pt, nsSize(1, 1)), aOptions,
                     aShouldFlushLayout, aMultiple, aViewportType,
                     aPerformRetargeting, aNodes);
}

}  // namespace

Element* DocumentOrShadowRoot::ElementFromPoint(float aX, float aY) {
  return ElementFromPointHelper(aX, aY, false, true, ViewportType::Layout);
}

void DocumentOrShadowRoot::ElementsFromPoint(
    float aX, float aY, nsTArray<RefPtr<Element>>& aElements) {
  QueryNodesFromPoint(*this, aX, aY, {}, FlushLayout::Yes, Multiple::Yes,
                      ViewportType::Layout, PerformRetargeting::Yes, aElements);
}

void DocumentOrShadowRoot::NodesFromPoint(float aX, float aY,
                                          nsTArray<RefPtr<nsINode>>& aNodes) {
  QueryNodesFromPoint(*this, aX, aY, {}, FlushLayout::Yes, Multiple::Yes,
                      ViewportType::Layout, PerformRetargeting::Yes, aNodes);
}

nsINode* DocumentOrShadowRoot::NodeFromPoint(float aX, float aY) {
  AutoTArray<RefPtr<nsINode>, 1> nodes;
  QueryNodesFromPoint(*this, aX, aY, {}, FlushLayout::Yes, Multiple::No,
                      ViewportType::Layout, PerformRetargeting::Yes, nodes);
  return nodes.SafeElementAt(0);
}

Element* DocumentOrShadowRoot::ElementFromPointHelper(
    float aX, float aY, bool aIgnoreRootScrollFrame, bool aFlushLayout,
    ViewportType aViewportType, bool aPerformRetargeting) {
  EnumSet<FrameForPointOption> options;
  if (aIgnoreRootScrollFrame) {
    options += FrameForPointOption::IgnoreRootScrollFrame;
  }

  auto flush = aFlushLayout ? FlushLayout::Yes : FlushLayout::No;
  auto performRetargeting =
      aPerformRetargeting ? PerformRetargeting::Yes : PerformRetargeting::No;

  AutoTArray<RefPtr<Element>, 1> elements;
  QueryNodesFromPoint(*this, aX, aY, options, flush, Multiple::No,
                      aViewportType, performRetargeting, elements);
  return elements.SafeElementAt(0);
}

void DocumentOrShadowRoot::NodesFromRect(float aX, float aY, float aTopSize,
                                         float aRightSize, float aBottomSize,
                                         float aLeftSize,
                                         bool aIgnoreRootScrollFrame,
                                         bool aFlushLayout, bool aOnlyVisible,
                                         float aVisibleThreshold,
                                         nsTArray<RefPtr<nsINode>>& aReturn) {
  // Following the same behavior of elementFromPoint,
  // we don't return anything if either coord is negative
  if (!aIgnoreRootScrollFrame && (aX < 0 || aY < 0)) {
    return;
  }

  nscoord x = nsPresContext::CSSPixelsToAppUnits(aX - aLeftSize);
  nscoord y = nsPresContext::CSSPixelsToAppUnits(aY - aTopSize);
  nscoord w = nsPresContext::CSSPixelsToAppUnits(aLeftSize + aRightSize) + 1;
  nscoord h = nsPresContext::CSSPixelsToAppUnits(aTopSize + aBottomSize) + 1;

  nsRect rect(x, y, w, h);

  FrameForPointOptions options;
  if (aIgnoreRootScrollFrame) {
    options.mBits += FrameForPointOption::IgnoreRootScrollFrame;
  }
  if (aOnlyVisible) {
    options.mBits += FrameForPointOption::OnlyVisible;
    options.mVisibleThreshold = aVisibleThreshold;
  }

  auto flush = aFlushLayout ? FlushLayout::Yes : FlushLayout::No;
  QueryNodesFromRect(*this, rect, options, flush, Multiple::Yes,
                     ViewportType::Layout, PerformRetargeting::No, aReturn);
}

Element* DocumentOrShadowRoot::AddIDTargetObserver(nsAtom* aID,
                                                   IDTargetObserver aObserver,
                                                   void* aData,
                                                   bool aForImage) {
  nsDependentAtomString id(aID);

  if (!CheckGetElementByIdArg(id)) {
    return nullptr;
  }

  IdentifierMapEntry* entry = mIdentifierMap.PutEntry(aID);
  NS_ENSURE_TRUE(entry, nullptr);

  entry->AddContentChangeCallback(aObserver, aData, aForImage);
  return aForImage ? entry->GetImageIdElement() : entry->GetIdElement();
}

void DocumentOrShadowRoot::RemoveIDTargetObserver(nsAtom* aID,
                                                  IDTargetObserver aObserver,
                                                  void* aData, bool aForImage) {
  nsDependentAtomString id(aID);

  if (!CheckGetElementByIdArg(id)) {
    return;
  }

  IdentifierMapEntry* entry = mIdentifierMap.GetEntry(aID);
  if (!entry) {
    return;
  }

  entry->RemoveContentChangeCallback(aObserver, aData, aForImage);
}

Element* DocumentOrShadowRoot::LookupImageElement(const nsAString& aId) {
  if (aId.IsEmpty()) {
    return nullptr;
  }

  IdentifierMapEntry* entry = mIdentifierMap.GetEntry(aId);
  return entry ? entry->GetImageIdElement() : nullptr;
}

void DocumentOrShadowRoot::ReportEmptyGetElementByIdArg() const {
  nsContentUtils::ReportEmptyGetElementByIdArg(AsNode().OwnerDoc());
}

void DocumentOrShadowRoot::GetAnimations(
    nsTArray<RefPtr<Animation>>& aAnimations) {
  // As with Element::GetAnimations we initially flush style here.
  // This should ensure that there are no subsequent changes to the tree
  // structure while iterating over the children below.
  if (Document* doc = AsNode().GetComposedDoc()) {
    doc->FlushPendingNotifications(
        ChangesToFlush(FlushType::Style, false /* flush animations */));
  }

  GetAnimationsOptions options;
  options.mSubtree = true;

  for (RefPtr<nsIContent> child = AsNode().GetFirstChild(); child;
       child = child->GetNextSibling()) {
    if (RefPtr<Element> element = Element::FromNode(child)) {
      nsTArray<RefPtr<Animation>> result;
      element->GetAnimationsWithoutFlush(options, result);
      aAnimations.AppendElements(std::move(result));
    }
  }

  aAnimations.Sort(AnimationPtrComparator<RefPtr<Animation>>());
}

int32_t DocumentOrShadowRoot::StyleOrderIndexOfSheet(
    const StyleSheet& aSheet) const {
  if (aSheet.IsConstructed()) {
    // NOTE: constructable sheets can have duplicates, so we need to start
    // looking from behind.
    int32_t index = mAdoptedStyleSheets.LastIndexOf(&aSheet);
    return (index < 0) ? index : index + SheetCount();
  }
  return mStyleSheets.IndexOf(&aSheet);
}

void DocumentOrShadowRoot::TraverseSheetRefInStylesIfApplicable(
    StyleSheet& aSheet, nsCycleCollectionTraversalCallback& cb) {
  if (!aSheet.IsApplicable()) {
    return;
  }
  if (mKind == Kind::ShadowRoot) {
    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mServoStyles->sheets[i]");
    cb.NoteXPCOMChild(&aSheet);
  } else if (AsNode().AsDocument()->StyleSetFilled()) {
    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(
        cb, "mStyleSet->mRawSet.stylist.stylesheets.[i]");
    cb.NoteXPCOMChild(&aSheet);
  }
}

void DocumentOrShadowRoot::TraverseStyleSheets(
    nsTArray<RefPtr<StyleSheet>>& aSheets, const char* aEdgeName,
    nsCycleCollectionTraversalCallback& cb) {
  MOZ_ASSERT(aEdgeName);
  MOZ_ASSERT(&aSheets != &mAdoptedStyleSheets);
  for (StyleSheet* sheet : aSheets) {
    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, aEdgeName);
    cb.NoteXPCOMChild(sheet);
    TraverseSheetRefInStylesIfApplicable(*sheet, cb);
  }
}

void DocumentOrShadowRoot::Traverse(DocumentOrShadowRoot* tmp,
                                    nsCycleCollectionTraversalCallback& cb) {
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDOMStyleSheets)
  tmp->TraverseStyleSheets(tmp->mStyleSheets, "mStyleSheets[i]", cb);

  tmp->EnumerateUniqueAdoptedStyleSheetsBackToFront([&](StyleSheet& aSheet) {
    tmp->TraverseSheetRefInStylesIfApplicable(aSheet, cb);
  });
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAdoptedStyleSheets);

  for (auto iter = tmp->mIdentifierMap.Iter(); !iter.Done(); iter.Next()) {
    iter.Get()->Traverse(&cb);
  }
}

void DocumentOrShadowRoot::UnlinkStyleSheets(
    nsTArray<RefPtr<StyleSheet>>& aSheets) {
  MOZ_ASSERT(&aSheets != &mAdoptedStyleSheets);
  for (StyleSheet* sheet : aSheets) {
    sheet->ClearAssociatedDocumentOrShadowRoot();
    RemoveSheetFromStylesIfApplicable(*sheet);
  }
  aSheets.Clear();
}

void DocumentOrShadowRoot::Unlink(DocumentOrShadowRoot* tmp) {
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mDOMStyleSheets);
  tmp->UnlinkStyleSheets(tmp->mStyleSheets);
  tmp->EnumerateUniqueAdoptedStyleSheetsBackToFront([&](StyleSheet& aSheet) {
    aSheet.RemoveAdopter(*tmp);
    tmp->RemoveSheetFromStylesIfApplicable(aSheet);
  });
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mAdoptedStyleSheets);
  tmp->mIdentifierMap.Clear();
}

}  // namespace mozilla::dom

quality92%

¤ Dauer der Verarbeitung: 0.15 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.