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gecko-dev
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gecko-dev/dom/html/HTMLSlotElement.cpp

380 строки
12 KiB
C++
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/* -*- 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/HTMLUnknownElement.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/Text.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(bool aNullParent) {
RefPtr<ShadowRoot> oldContainingShadow = GetContainingShadow();
nsGenericHTMLElement::UnbindFromTree(aNullParent);
if (oldContainingShadow && !GetContainingShadow()) {
oldContainingShadow->RemoveSlot(this);
}
}
nsresult HTMLSlotElement::BeforeSetAttr(int32_t aNameSpaceID, nsAtom* aName,
const nsAttrValueOrString* aValue,
bool aNotify) {
if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::name) {
if (ShadowRoot* containingShadow = GetContainingShadow()) {
containingShadow->RemoveSlot(this);
}
}
return nsGenericHTMLElement::BeforeSetAttr(aNameSpaceID, aName, aValue,
aNotify);
}
nsresult 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) {
MOZ_ASSERT(StaticPrefs::dom_shadowdom_slot_assign_enabled());
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) {
nsTArray<RefPtr<nsINode>> assignedNodes(std::move(mAssignedNodes));
for (RefPtr<nsINode>& node : assignedNodes) {
nsIContent* content = node->AsContent();
HTMLSlotElement* oldSlot = content->GetAssignedSlot();
MOZ_RELEASE_ASSERT(oldSlot == this);
if (changedSlots.EnsureInserted(oldSlot)) {
if (root) {
MOZ_ASSERT(oldSlot->GetContainingShadow() == root);
root->InvalidateStyleAndLayoutOnSubtree(oldSlot);
}
}
oldSlot->RemoveAssignedNode(*content);
}
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);
SlotAssignedNodeChanged(this, aNode);
}
void HTMLSlotElement::AppendAssignedNode(nsIContent& aNode) {
MOZ_ASSERT(!aNode.GetAssignedSlot(), "Losing track of a slot");
mAssignedNodes.AppendElement(&aNode);
aNode.SetAssignedSlot(this);
SlotAssignedNodeChanged(this, aNode);
}
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);
SlotAssignedNodeChanged(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();
}
void HTMLSlotElement::EnqueueSlotChangeEvent() {
if (mInSignalSlotList) {
return;
}
// FIXME(bug 1459704): Need to figure out how to deal with microtasks posted
// during shutdown.
if (gXPCOMThreadsShutDown) {
return;
}
DocGroup* docGroup = OwnerDoc()->GetDocGroup();
if (!docGroup) {
return;
}
mInSignalSlotList = true;
docGroup->SignalSlotChange(*this);
}
void HTMLSlotElement::FireSlotChangeEvent() {
nsContentUtils::DispatchTrustedEvent(
OwnerDoc(), static_cast<nsIContent*>(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
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