Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale Sprachen/C/Firefox/dom/html/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 12 kB

Quelle HTMLSlotElement.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/PresShell.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "mozilla/dom/HTMLSlotElementBinding.h"
#include "mozilla/dom/HTMLUnknownElement.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/Text.h"
#include "mozilla/AppShutdown.h"
#include "nsContentUtils.h"
#include "nsGkAtoms.h"

nsGenericHTMLElement* NS_NewHTMLSlotElement(
    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
    mozilla::dom::FromParser aFromParser) {
  RefPtr<mozilla::dom::NodeInfo> nodeInfo(std::move(aNodeInfo));
  auto* nim = nodeInfo->NodeInfoManager();
  return new (nim) mozilla::dom::HTMLSlotElement(nodeInfo.forget());
}

namespace mozilla::dom {

HTMLSlotElement::HTMLSlotElement(
    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
    : nsGenericHTMLElement(std::move(aNodeInfo)) {}

HTMLSlotElement::~HTMLSlotElement() {
  for (const auto& node : mManuallyAssignedNodes) {
    MOZ_ASSERT(node->AsContent()->GetManualSlotAssignment() == this);
    node->AsContent()->SetManualSlotAssignment(nullptr);
  }
}

NS_IMPL_ADDREF_INHERITED(HTMLSlotElement, nsGenericHTMLElement)
NS_IMPL_RELEASE_INHERITED(HTMLSlotElement, nsGenericHTMLElement)

NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLSlotElement, nsGenericHTMLElement,
                                   mAssignedNodes)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(HTMLSlotElement)
NS_INTERFACE_MAP_END_INHERITING(nsGenericHTMLElement)

NS_IMPL_ELEMENT_CLONE(HTMLSlotElement)

nsresult HTMLSlotElement::BindToTree(BindContext& aContext, nsINode& aParent) {
  RefPtr<ShadowRoot> oldContainingShadow = GetContainingShadow();

  nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
  NS_ENSURE_SUCCESS(rv, rv);

  ShadowRoot* containingShadow = GetContainingShadow();
  mInManualShadowRoot =
      containingShadow &&
      containingShadow->SlotAssignment() == SlotAssignmentMode::Manual;
  if (containingShadow && !oldContainingShadow) {
    containingShadow->AddSlot(this);
  }

  return NS_OK;
}

void HTMLSlotElement::UnbindFromTree(UnbindContext& aContext) {
  RefPtr<ShadowRoot> oldContainingShadow = GetContainingShadow();

  nsGenericHTMLElement::UnbindFromTree(aContext);

  if (oldContainingShadow && !GetContainingShadow()) {
    oldContainingShadow->RemoveSlot(this);
  }
}

void HTMLSlotElement::BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
                                    const nsAttrValue* aValue, bool aNotify) {
  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::name) {
    if (ShadowRoot* containingShadow = GetContainingShadow()) {
      containingShadow->RemoveSlot(this);
    }
  }

  return nsGenericHTMLElement::BeforeSetAttr(aNameSpaceID, aName, aValue,
                                             aNotify);
}

void HTMLSlotElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
                                   const nsAttrValue* aValue,
                                   const nsAttrValue* aOldValue,
                                   nsIPrincipal* aSubjectPrincipal,
                                   bool aNotify) {
  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::name) {
    if (ShadowRoot* containingShadow = GetContainingShadow()) {
      containingShadow->AddSlot(this);
    }
  }

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

/**
* Flatten assigned nodes given a slot, as in:
* https://dom.spec.whatwg.org/#find-flattened-slotables
*/
static void FlattenAssignedNodes(HTMLSlotElement* aSlot,
                                 nsTArray<RefPtr<nsINode>>& aNodes) {
  if (!aSlot->GetContainingShadow()) {
    return;
  }

  const nsTArray<RefPtr<nsINode>>& assignedNodes = aSlot->AssignedNodes();

  // If assignedNodes is empty, use children of slot as fallback content.
  if (assignedNodes.IsEmpty()) {
    for (nsIContent* child = aSlot->GetFirstChild(); child;
         child = child->GetNextSibling()) {
      if (!child->IsSlotable()) {
        continue;
      }

      if (auto* slot = HTMLSlotElement::FromNode(child)) {
        FlattenAssignedNodes(slot, aNodes);
      } else {
        aNodes.AppendElement(child);
      }
    }
    return;
  }

  for (const RefPtr<nsINode>& assignedNode : assignedNodes) {
    auto* slot = HTMLSlotElement::FromNode(assignedNode);
    if (slot && slot->GetContainingShadow()) {
      FlattenAssignedNodes(slot, aNodes);
    } else {
      aNodes.AppendElement(assignedNode);
    }
  }
}

void HTMLSlotElement::AssignedNodes(const AssignedNodesOptions& aOptions,
                                    nsTArray<RefPtr<nsINode>>& aNodes) {
  if (aOptions.mFlatten) {
    return FlattenAssignedNodes(this, aNodes);
  }

  aNodes = mAssignedNodes.Clone();
}

void HTMLSlotElement::AssignedElements(const AssignedNodesOptions& aOptions,
                                       nsTArray<RefPtr<Element>>& aElements) {
  AutoTArray<RefPtr<nsINode>, 128> assignedNodes;
  AssignedNodes(aOptions, assignedNodes);
  for (const RefPtr<nsINode>& assignedNode : assignedNodes) {
    if (assignedNode->IsElement()) {
      aElements.AppendElement(assignedNode->AsElement());
    }
  }
}

const nsTArray<RefPtr<nsINode>>& HTMLSlotElement::AssignedNodes() const {
  return mAssignedNodes;
}

const nsTArray<nsINode*>& HTMLSlotElement::ManuallyAssignedNodes() const {
  return mManuallyAssignedNodes;
}

void HTMLSlotElement::Assign(const Sequence<OwningElementOrText>& aNodes) {
  nsAutoScriptBlocker scriptBlocker;

  // no-op if the input nodes and the assigned nodes are identical
  // This also works if the two 'assign' calls are like
  //   > slot.assign(node1, node2);
  //   > slot.assign(node1, node2, node1, node2);
  if (!mAssignedNodes.IsEmpty() && aNodes.Length() >= mAssignedNodes.Length()) {
    nsTHashMap<nsPtrHashKey<nsIContent>, size_t> nodeIndexMap;
    for (size_t i = 0; i < aNodes.Length(); ++i) {
      nsIContent* content;
      if (aNodes[i].IsElement()) {
        content = aNodes[i].GetAsElement();
      } else {
        content = aNodes[i].GetAsText();
      }
      MOZ_ASSERT(content);
      // We only care about the first index this content appears
      // in the array
      nodeIndexMap.LookupOrInsert(content, i);
    }

    if (nodeIndexMap.Count() == mAssignedNodes.Length()) {
      bool isIdentical = true;
      for (size_t i = 0; i < mAssignedNodes.Length(); ++i) {
        size_t indexInInputNodes;
        if (!nodeIndexMap.Get(mAssignedNodes[i]->AsContent(),
                              &indexInInputNodes) ||
            indexInInputNodes != i) {
          isIdentical = false;
          break;
        }
      }
      if (isIdentical) {
        return;
      }
    }
  }

  // 1. For each node of this's manually assigned nodes, set node's manual slot
  // assignment to null.
  for (nsINode* node : mManuallyAssignedNodes) {
    MOZ_ASSERT(node->AsContent()->GetManualSlotAssignment() == this);
    node->AsContent()->SetManualSlotAssignment(nullptr);
  }

  // 2. Let nodesSet be a new ordered set.
  mManuallyAssignedNodes.Clear();

  nsIContent* host = nullptr;
  ShadowRoot* root = GetContainingShadow();

  // An optimization to keep track which slots need to enqueue
  // slotchange event, such that they can be enqueued later in
  // tree order.
  nsTHashSet<RefPtr<HTMLSlotElement>> changedSlots;

  // Clear out existing assigned nodes
  if (mInManualShadowRoot) {
    if (!mAssignedNodes.IsEmpty()) {
      changedSlots.EnsureInserted(this);
      if (root) {
        root->InvalidateStyleAndLayoutOnSubtree(this);
      }
      ClearAssignedNodes();
    }

    MOZ_ASSERT(mAssignedNodes.IsEmpty());
    host = GetContainingShadowHost();
  }

  for (const OwningElementOrText& elementOrText : aNodes) {
    nsIContent* content;
    if (elementOrText.IsElement()) {
      content = elementOrText.GetAsElement();
    } else {
      content = elementOrText.GetAsText();
    }

    MOZ_ASSERT(content);
    // XXXsmaug Should we have a helper for
    //         https://infra.spec.whatwg.org/#ordered-set?
    if (content->GetManualSlotAssignment() != this) {
      if (HTMLSlotElement* oldSlot = content->GetAssignedSlot()) {
        if (changedSlots.EnsureInserted(oldSlot)) {
          if (root) {
            MOZ_ASSERT(oldSlot->GetContainingShadow() == root);
            root->InvalidateStyleAndLayoutOnSubtree(oldSlot);
          }
        }
      }

      if (changedSlots.EnsureInserted(this)) {
        if (root) {
          root->InvalidateStyleAndLayoutOnSubtree(this);
        }
      }
      // 3.1 (HTML Spec) If content's manual slot assignment refers to a slot,
      // then remove node from that slot's manually assigned nodes. 3.2 (HTML
      // Spec) Set content's manual slot assignment to this.
      if (HTMLSlotElement* oldSlot = content->GetManualSlotAssignment()) {
        oldSlot->RemoveManuallyAssignedNode(*content);
      }
      content->SetManualSlotAssignment(this);
      mManuallyAssignedNodes.AppendElement(content);

      if (root && host && content->GetParent() == host) {
        // Equivalent to 4.2.2.4.3 (DOM Spec) `Set slot's assigned nodes to
        // slottables`
        root->MaybeReassignContent(*content);
      }
    }
  }

  // The `assign slottables` step is completed already at this point,
  // however we haven't fired the `slotchange` event yet because this
  // needs to be done in tree order.
  if (root) {
    for (nsIContent* child = root->GetFirstChild(); child;
         child = child->GetNextNode()) {
      if (HTMLSlotElement* slot = HTMLSlotElement::FromNode(child)) {
        if (changedSlots.EnsureRemoved(slot)) {
          slot->EnqueueSlotChangeEvent();
        }
      }
    }
    MOZ_ASSERT(changedSlots.IsEmpty());
  }
}

void HTMLSlotElement::InsertAssignedNode(uint32_t aIndex, nsIContent& aNode) {
  MOZ_ASSERT(!aNode.GetAssignedSlot(), "Losing track of a slot");
  mAssignedNodes.InsertElementAt(aIndex, &aNode);
  aNode.SetAssignedSlot(this);
  RecalculateHasSlottedState();
  SlotAssignedNodeAdded(this, aNode);
}

void HTMLSlotElement::AppendAssignedNode(nsIContent& aNode) {
  MOZ_ASSERT(!aNode.GetAssignedSlot(), "Losing track of a slot");
  mAssignedNodes.AppendElement(&aNode);
  aNode.SetAssignedSlot(this);
  RecalculateHasSlottedState();
  SlotAssignedNodeAdded(this, aNode);
}

void HTMLSlotElement::RecalculateHasSlottedState() {
  bool hasSlotted = false;
  // Find the first node that makes this a slotted element.
  for (const RefPtr<nsINode>& assignedNode : mAssignedNodes) {
    if (auto* slot = HTMLSlotElement::FromNode(assignedNode)) {
      if (slot->IsInShadowTree() &&
          !slot->State().HasState(ElementState::HAS_SLOTTED)) {
        continue;
      }
    }
    hasSlotted = true;
    break;
  }
  if (State().HasState(ElementState::HAS_SLOTTED) != hasSlotted) {
    SetStates(ElementState::HAS_SLOTTED, hasSlotted);
    // If slot is a slotted node itself, the assigned slot needs to
    // RecalculateHasSlottedState:
    if (auto* slot = GetAssignedSlot()) {
      slot->RecalculateHasSlottedState();
    }
  }
}

void HTMLSlotElement::RemoveAssignedNode(nsIContent& aNode) {
  // This one runs from unlinking, so we can't guarantee that the slot pointer
  // hasn't been cleared.
  MOZ_ASSERT(!aNode.GetAssignedSlot() || aNode.GetAssignedSlot() == this,
             "How exactly?");
  mAssignedNodes.RemoveElement(&aNode);
  aNode.SetAssignedSlot(nullptr);

  RecalculateHasSlottedState();
  SlotAssignedNodeRemoved(this, aNode);
}

void HTMLSlotElement::ClearAssignedNodes() {
  for (RefPtr<nsINode>& node : mAssignedNodes) {
    MOZ_ASSERT(!node->AsContent()->GetAssignedSlot() ||
                   node->AsContent()->GetAssignedSlot() == this,
               "How exactly?");
    node->AsContent()->SetAssignedSlot(nullptr);
  }

  mAssignedNodes.Clear();
  RecalculateHasSlottedState();
}

void HTMLSlotElement::EnqueueSlotChangeEvent() {
  if (mInSignalSlotList) {
    return;
  }

  // FIXME(bug 1459704): Need to figure out how to deal with microtasks posted
  // during shutdown.
  if (AppShutdown::IsInOrBeyond(ShutdownPhase::XPCOMShutdownThreads)) {
    return;
  }

  DocGroup* docGroup = OwnerDoc()->GetDocGroup();
  if (!docGroup) {
    return;
  }

  mInSignalSlotList = true;
  docGroup->SignalSlotChange(*this);
}

void HTMLSlotElement::FireSlotChangeEvent() {
  nsContentUtils::DispatchTrustedEvent(OwnerDoc(), this, u"slotchange"_ns,
                                       CanBubble::eYes, Cancelable::eNo);
}

void HTMLSlotElement::RemoveManuallyAssignedNode(nsIContent& aNode) {
  mManuallyAssignedNodes.RemoveElement(&aNode);
  RemoveAssignedNode(aNode);
}

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

}  // namespace mozilla::dom

quality85%

¤ Dauer der Verarbeitung: 0.13 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.