gecko-dev/dom/base/ShadowRoot.cpp

692 строки
19 KiB
C++
Исходник Обычный вид История

/* -*- 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/Preferences.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/ShadowRootBinding.h"
#include "mozilla/dom/DocumentFragment.h"
#include "ChildIterator.h"
#include "nsContentUtils.h"
#include "nsIStyleSheetLinkingElement.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "nsXBLPrototypeBinding.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_CYCLE_COLLECTION_CLASS(ShadowRoot)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ShadowRoot,
DocumentFragment)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDOMStyleSheets)
for (auto iter = tmp->mIdentifierMap.ConstIter(); !iter.Done();
iter.Next()) {
iter.Get()->Traverse(&cb);
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ShadowRoot)
if (tmp->GetHost()) {
tmp->GetHost()->RemoveMutationObserver(tmp);
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDOMStyleSheets)
tmp->mIdentifierMap.Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(DocumentFragment)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ShadowRoot)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIContent)
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_END_INHERITING(DocumentFragment)
NS_IMPL_ADDREF_INHERITED(ShadowRoot, DocumentFragment)
NS_IMPL_RELEASE_INHERITED(ShadowRoot, DocumentFragment)
ShadowRoot::ShadowRoot(Element* aElement, ShadowRootMode aMode,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: DocumentFragment(aNodeInfo)
, DocumentOrShadowRoot(*this)
, mMode(aMode)
, mServoStyles(Servo_AuthorStyles_Create())
, mIsComposedDocParticipant(false)
{
SetHost(aElement);
// Nodes in a shadow tree should never store a value
// in the subtree root pointer, nodes in the shadow tree
// track the subtree root using GetContainingShadow().
ClearSubtreeRootPointer();
SetFlags(NODE_IS_IN_SHADOW_TREE);
ExtendedDOMSlots()->mBindingParent = aElement;
ExtendedDOMSlots()->mContainingShadow = this;
// Add the ShadowRoot as a mutation observer on the host to watch
// for mutations because the insertion points in this ShadowRoot
// may need to be updated when the host children are modified.
GetHost()->AddMutationObserver(this);
}
ShadowRoot::~ShadowRoot()
{
if (auto* host = GetHost()) {
// mHost may have been unlinked.
host->RemoveMutationObserver(this);
}
if (IsComposedDocParticipant()) {
OwnerDoc()->RemoveComposedDocShadowRoot(*this);
}
MOZ_DIAGNOSTIC_ASSERT(!OwnerDoc()->IsComposedDocShadowRoot(*this));
UnsetFlags(NODE_IS_IN_SHADOW_TREE);
// nsINode destructor expects mSubtreeRoot == this.
SetSubtreeRootPointer(this);
}
void
ShadowRoot::SetIsComposedDocParticipant(bool aIsComposedDocParticipant)
{
bool changed = mIsComposedDocParticipant != aIsComposedDocParticipant;
mIsComposedDocParticipant = aIsComposedDocParticipant;
if (!changed) {
return;
}
nsIDocument* doc = OwnerDoc();
if (IsComposedDocParticipant()) {
doc->AddComposedDocShadowRoot(*this);
} else {
doc->RemoveComposedDocShadowRoot(*this);
}
}
JSObject*
Bug 1117172 part 3. Change the wrappercached WrapObject methods to allow passing in aGivenProto. r=peterv The only manual changes here are to BindingUtils.h, BindingUtils.cpp, Codegen.py, Element.cpp, IDBFileRequest.cpp, IDBObjectStore.cpp, dom/workers/Navigator.cpp, WorkerPrivate.cpp, DeviceStorageRequestChild.cpp, Notification.cpp, nsGlobalWindow.cpp, MessagePort.cpp, nsJSEnvironment.cpp, Sandbox.cpp, XPCConvert.cpp, ExportHelpers.cpp, and DataStoreService.cpp. The rest of this diff was generated by running the following commands: find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObject\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(Binding(?:_workers)?::Wrap\((?:aCx|cx|aContext|aCtx|js), [^,)]+)\)/\1, aGivenProto)/g'
2015-03-19 17:13:33 +03:00
ShadowRoot::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
Bug 1117172 part 3. Change the wrappercached WrapObject methods to allow passing in aGivenProto. r=peterv The only manual changes here are to BindingUtils.h, BindingUtils.cpp, Codegen.py, Element.cpp, IDBFileRequest.cpp, IDBObjectStore.cpp, dom/workers/Navigator.cpp, WorkerPrivate.cpp, DeviceStorageRequestChild.cpp, Notification.cpp, nsGlobalWindow.cpp, MessagePort.cpp, nsJSEnvironment.cpp, Sandbox.cpp, XPCConvert.cpp, ExportHelpers.cpp, and DataStoreService.cpp. The rest of this diff was generated by running the following commands: find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObject\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(Binding(?:_workers)?::Wrap\((?:aCx|cx|aContext|aCtx|js), [^,)]+)\)/\1, aGivenProto)/g'
2015-03-19 17:13:33 +03:00
return mozilla::dom::ShadowRootBinding::Wrap(aCx, this, aGivenProto);
}
void
ShadowRoot::CloneInternalDataFrom(ShadowRoot* aOther)
{
size_t sheetCount = aOther->SheetCount();
for (size_t i = 0; i < sheetCount; ++i) {
StyleSheet* sheet = aOther->SheetAt(i);
if (sheet->IsApplicable()) {
RefPtr<StyleSheet> clonedSheet =
sheet->Clone(nullptr, nullptr, nullptr, nullptr);
if (clonedSheet) {
AppendStyleSheet(*clonedSheet.get());
}
}
}
}
void
ShadowRoot::InvalidateStyleAndLayoutOnSubtree(Element* aElement)
{
MOZ_ASSERT(aElement);
if (!IsComposedDocParticipant()) {
return;
}
MOZ_ASSERT(GetComposedDoc() == OwnerDoc());
nsIPresShell* shell = OwnerDoc()->GetShell();
if (!shell) {
return;
}
shell->DestroyFramesForAndRestyle(aElement);
}
void
ShadowRoot::AddSlot(HTMLSlotElement* aSlot)
{
MOZ_ASSERT(aSlot);
// Note that if name attribute missing, the slot is a default slot.
nsAutoString name;
aSlot->GetName(name);
nsTArray<HTMLSlotElement*>* currentSlots = mSlotMap.LookupOrAdd(name);
MOZ_ASSERT(currentSlots);
HTMLSlotElement* oldSlot = currentSlots->SafeElementAt(0);
TreeOrderComparator comparator;
currentSlots->InsertElementSorted(aSlot, comparator);
HTMLSlotElement* currentSlot = currentSlots->ElementAt(0);
if (currentSlot != aSlot) {
return;
}
if (oldSlot && oldSlot != currentSlot) {
// Move assigned nodes from old slot to new slot.
InvalidateStyleAndLayoutOnSubtree(oldSlot);
const nsTArray<RefPtr<nsINode>>& assignedNodes = oldSlot->AssignedNodes();
bool doEnqueueSlotChange = false;
while (assignedNodes.Length() > 0) {
nsINode* assignedNode = assignedNodes[0];
oldSlot->RemoveAssignedNode(assignedNode);
currentSlot->AppendAssignedNode(assignedNode);
doEnqueueSlotChange = true;
}
if (doEnqueueSlotChange) {
oldSlot->EnqueueSlotChangeEvent();
currentSlot->EnqueueSlotChangeEvent();
}
} else {
bool doEnqueueSlotChange = false;
// Otherwise add appropriate nodes to this slot from the host.
for (nsIContent* child = GetHost()->GetFirstChild();
child;
child = child->GetNextSibling()) {
nsAutoString slotName;
if (child->IsElement()) {
child->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::slot, slotName);
}
if (!child->IsSlotable() || !slotName.Equals(name)) {
continue;
}
doEnqueueSlotChange = true;
currentSlot->AppendAssignedNode(child);
}
if (doEnqueueSlotChange) {
currentSlot->EnqueueSlotChangeEvent();
}
}
}
void
ShadowRoot::RemoveSlot(HTMLSlotElement* aSlot)
{
MOZ_ASSERT(aSlot);
nsAutoString name;
aSlot->GetName(name);
SlotArray* currentSlots = mSlotMap.Get(name);
MOZ_DIAGNOSTIC_ASSERT(currentSlots && currentSlots->Contains(aSlot),
"Slot to deregister wasn't found?");
if (currentSlots->Length() == 1) {
MOZ_ASSERT(currentSlots->ElementAt(0) == aSlot);
mSlotMap.Remove(name);
if (!aSlot->AssignedNodes().IsEmpty()) {
aSlot->ClearAssignedNodes();
aSlot->EnqueueSlotChangeEvent();
}
return;
}
const bool wasFirstSlot = currentSlots->ElementAt(0) == aSlot;
currentSlots->RemoveElement(aSlot);
// Move assigned nodes from removed slot to the next slot in
// tree order with the same name.
if (!wasFirstSlot) {
return;
}
HTMLSlotElement* replacementSlot = currentSlots->ElementAt(0);
const nsTArray<RefPtr<nsINode>>& assignedNodes = aSlot->AssignedNodes();
bool slottedNodesChanged = !assignedNodes.IsEmpty();
while (!assignedNodes.IsEmpty()) {
nsINode* assignedNode = assignedNodes[0];
aSlot->RemoveAssignedNode(assignedNode);
replacementSlot->AppendAssignedNode(assignedNode);
}
if (slottedNodesChanged) {
aSlot->EnqueueSlotChangeEvent();
replacementSlot->EnqueueSlotChangeEvent();
}
}
// FIXME(emilio): There's a bit of code duplication between this and the
// equivalent ServoStyleSet methods, it'd be nice to not duplicate it...
void
ShadowRoot::RuleAdded(StyleSheet& aSheet, css::Rule& aRule)
{
if (mStyleRuleMap) {
mStyleRuleMap->RuleAdded(*aSheet.AsServo(), aRule);
}
Servo_AuthorStyles_ForceDirty(mServoStyles.get());
ApplicableRulesChanged();
}
void
ShadowRoot::RuleRemoved(StyleSheet& aSheet, css::Rule& aRule)
{
if (mStyleRuleMap) {
mStyleRuleMap->RuleRemoved(*aSheet.AsServo(), aRule);
}
Servo_AuthorStyles_ForceDirty(mServoStyles.get());
ApplicableRulesChanged();
}
void
ShadowRoot::RuleChanged(StyleSheet&, css::Rule*) {
Servo_AuthorStyles_ForceDirty(mServoStyles.get());
ApplicableRulesChanged();
}
void
ShadowRoot::ApplicableRulesChanged()
{
if (!IsComposedDocParticipant()) {
return;
}
nsIDocument* doc = OwnerDoc();
if (nsIPresShell* shell = doc->GetShell()) {
doc->BeginUpdate(UPDATE_STYLE);
shell->RecordShadowStyleChange(*this);
doc->EndUpdate(UPDATE_STYLE);
}
}
void
ShadowRoot::InsertSheetAt(size_t aIndex, StyleSheet& aSheet)
{
DocumentOrShadowRoot::InsertSheetAt(aIndex, aSheet);
if (aSheet.IsApplicable()) {
InsertSheetIntoAuthorData(aIndex, aSheet);
}
}
void
ShadowRoot::AppendStyleSheet(StyleSheet& aSheet)
{
DocumentOrShadowRoot::AppendStyleSheet(aSheet);
if (aSheet.IsApplicable()) {
Servo_AuthorStyles_AppendStyleSheet(mServoStyles.get(), aSheet.AsServo());
if (mStyleRuleMap) {
mStyleRuleMap->SheetAdded(*aSheet.AsServo());
}
ApplicableRulesChanged();
}
}
void
ShadowRoot::InsertSheet(StyleSheet* aSheet, nsIContent* aLinkingContent)
{
nsCOMPtr<nsIStyleSheetLinkingElement>
linkingElement = do_QueryInterface(aLinkingContent);
// FIXME(emilio, bug 1410578): <link> should probably also be allowed here.
MOZ_ASSERT(linkingElement, "The only styles in a ShadowRoot should come "
"from <style>.");
linkingElement->SetStyleSheet(aSheet); // This sets the ownerNode on the sheet
// Find the correct position to insert into the style sheet list (must
// be in tree order).
for (size_t i = 0; i <= SheetCount(); i++) {
if (i == SheetCount()) {
AppendStyleSheet(*aSheet);
return;
}
StyleSheet* sheet = SheetAt(i);
nsINode* sheetOwningNode = sheet->GetOwnerNode();
if (nsContentUtils::PositionIsBefore(aLinkingContent, sheetOwningNode)) {
InsertSheetAt(i, *aSheet);
return;
}
}
}
void
ShadowRoot::InsertSheetIntoAuthorData(size_t aIndex, StyleSheet& aSheet)
{
MOZ_ASSERT(SheetAt(aIndex) == &aSheet);
MOZ_ASSERT(aSheet.IsApplicable());
if (mStyleRuleMap) {
mStyleRuleMap->SheetAdded(*aSheet.AsServo());
}
for (size_t i = aIndex + 1; i < SheetCount(); ++i) {
StyleSheet* beforeSheet = SheetAt(i);
if (!beforeSheet->IsApplicable()) {
continue;
}
Servo_AuthorStyles_InsertStyleSheetBefore(
mServoStyles.get(), aSheet.AsServo(), beforeSheet->AsServo());
ApplicableRulesChanged();
return;
}
Servo_AuthorStyles_AppendStyleSheet(mServoStyles.get(), aSheet.AsServo());
ApplicableRulesChanged();
}
void
ShadowRoot::StyleSheetApplicableStateChanged(StyleSheet& aSheet, bool aApplicable)
{
MOZ_ASSERT(mStyleSheets.Contains(&aSheet));
if (aApplicable) {
int32_t index = IndexOfSheet(aSheet);
MOZ_RELEASE_ASSERT(index >= 0);
InsertSheetIntoAuthorData(size_t(index), aSheet);
} else {
if (mStyleRuleMap) {
mStyleRuleMap->SheetRemoved(*aSheet.AsServo());
}
Servo_AuthorStyles_RemoveStyleSheet(mServoStyles.get(), aSheet.AsServo());
ApplicableRulesChanged();
}
}
void
ShadowRoot::RemoveSheet(StyleSheet* aSheet)
{
DocumentOrShadowRoot::RemoveSheet(*aSheet);
if (aSheet->IsApplicable()) {
if (mStyleRuleMap) {
mStyleRuleMap->SheetRemoved(*aSheet->AsServo());
}
Servo_AuthorStyles_RemoveStyleSheet(mServoStyles.get(), aSheet->AsServo());
ApplicableRulesChanged();
}
}
void
ShadowRoot::AddToIdTable(Element* aElement, nsAtom* aId)
{
nsIdentifierMapEntry* entry = mIdentifierMap.PutEntry(aId);
if (entry) {
entry->AddIdElement(aElement);
}
}
void
ShadowRoot::RemoveFromIdTable(Element* aElement, nsAtom* aId)
{
nsIdentifierMapEntry* entry = mIdentifierMap.GetEntry(aId);
if (entry) {
entry->RemoveIdElement(aElement);
if (entry->IsEmpty()) {
mIdentifierMap.RemoveEntry(entry);
}
}
}
nsresult
ShadowRoot::GetEventTargetParent(EventChainPreVisitor& aVisitor)
{
aVisitor.mCanHandle = true;
aVisitor.mRootOfClosedTree = IsClosed();
// Inform that we're about to exit the current scope.
aVisitor.mRelatedTargetRetargetedInCurrentScope = false;
// https://dom.spec.whatwg.org/#ref-for-get-the-parent%E2%91%A6
if (!aVisitor.mEvent->mFlags.mComposed) {
nsCOMPtr<nsIContent> originalTarget =
do_QueryInterface(aVisitor.mEvent->mOriginalTarget);
if (originalTarget->GetContainingShadow() == this) {
// If we do stop propagation, we still want to propagate
// the event to chrome (nsPIDOMWindow::GetParentTarget()).
// The load event is special in that we don't ever propagate it
// to chrome.
nsCOMPtr<nsPIDOMWindowOuter> win = OwnerDoc()->GetWindow();
EventTarget* parentTarget = win && aVisitor.mEvent->mMessage != eLoad
? win->GetParentTarget() : nullptr;
aVisitor.SetParentTarget(parentTarget, true);
return NS_OK;
}
}
nsIContent* shadowHost = GetHost();
aVisitor.SetParentTarget(shadowHost, false);
nsCOMPtr<nsIContent> content(do_QueryInterface(aVisitor.mEvent->mTarget));
if (content && content->GetBindingParent() == shadowHost) {
aVisitor.mEventTargetAtParent = shadowHost;
}
return NS_OK;
}
ShadowRoot::SlotAssignment
ShadowRoot::SlotAssignmentFor(nsIContent* aContent)
{
nsAutoString slotName;
// Note that if slot attribute is missing, assign it to the first default
// slot, if exists.
if (aContent->IsElement()) {
aContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::slot, slotName);
}
nsTArray<HTMLSlotElement*>* slots = mSlotMap.Get(slotName);
if (!slots) {
return { };
}
HTMLSlotElement* slot = slots->ElementAt(0);
MOZ_ASSERT(slot);
// Find the appropriate position in the assigned node list for the
// newly assigned content.
const nsTArray<RefPtr<nsINode>>& assignedNodes = slot->AssignedNodes();
nsIContent* currentContent = GetHost()->GetFirstChild();
Maybe<uint32_t> insertionIndex;
for (uint32_t i = 0; i < assignedNodes.Length(); i++) {
// Seek through the host's explicit children until the
// assigned content is found.
while (currentContent && currentContent != assignedNodes[i]) {
if (currentContent == aContent) {
insertionIndex.emplace(i);
break;
}
currentContent = currentContent->GetNextSibling();
}
if (insertionIndex) {
break;
}
}
return { slot, insertionIndex };
}
void
ShadowRoot::MaybeReassignElement(Element* aElement)
{
MOZ_ASSERT(aElement->GetParent() == GetHost());
HTMLSlotElement* oldSlot = aElement->GetAssignedSlot();
SlotAssignment assignment = SlotAssignmentFor(aElement);
if (assignment.mSlot == oldSlot) {
// Nothing to do here.
return;
}
if (IsComposedDocParticipant()) {
if (nsIPresShell* shell = OwnerDoc()->GetShell()) {
shell->SlotAssignmentWillChange(*aElement, oldSlot, assignment.mSlot);
}
}
if (oldSlot) {
oldSlot->RemoveAssignedNode(aElement);
oldSlot->EnqueueSlotChangeEvent();
}
if (assignment.mSlot) {
if (assignment.mIndex) {
assignment.mSlot->InsertAssignedNode(*assignment.mIndex, aElement);
} else {
assignment.mSlot->AppendAssignedNode(aElement);
}
assignment.mSlot->EnqueueSlotChangeEvent();
}
}
Element*
ShadowRoot::GetActiveElement()
{
return GetRetargetedFocusedElement();
}
void
ShadowRoot::GetInnerHTML(nsAString& aInnerHTML)
{
GetMarkup(false, aInnerHTML);
}
void
ShadowRoot::SetInnerHTML(const nsAString& aInnerHTML, ErrorResult& aError)
{
SetInnerHTMLInternal(aInnerHTML, aError);
}
void
ShadowRoot::AttributeChanged(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
if (aNameSpaceID != kNameSpaceID_None || aAttribute != nsGkAtoms::slot) {
return;
}
if (aElement->GetParent() != GetHost()) {
return;
}
MaybeReassignElement(aElement);
}
void
ShadowRoot::ContentAppended(nsIContent* aFirstNewContent)
{
for (nsIContent* content = aFirstNewContent;
content;
content = content->GetNextSibling()) {
ContentInserted(content);
}
}
void
ShadowRoot::ContentInserted(nsIContent* aChild)
{
// Check to ensure that the child not an anonymous subtree root because
// even though its parent could be the host it may not be in the host's child
// list.
if (aChild->IsRootOfAnonymousSubtree()) {
return;
}
if (!aChild->IsSlotable()) {
return;
}
if (aChild->GetParent() == GetHost()) {
SlotAssignment assignment = SlotAssignmentFor(aChild);
if (!assignment.mSlot) {
return;
}
// Fallback content will go away, let layout know.
if (assignment.mSlot->AssignedNodes().IsEmpty()) {
InvalidateStyleAndLayoutOnSubtree(assignment.mSlot);
}
if (assignment.mIndex) {
assignment.mSlot->InsertAssignedNode(*assignment.mIndex, aChild);
} else {
assignment.mSlot->AppendAssignedNode(aChild);
}
assignment.mSlot->EnqueueSlotChangeEvent();
return;
}
// If parent's root is a shadow root, and parent is a slot whose assigned
// nodes is the empty list, then run signal a slot change for parent.
HTMLSlotElement* slot = HTMLSlotElement::FromNodeOrNull(aChild->GetParent());
if (slot && slot->GetContainingShadow() == this &&
slot->AssignedNodes().IsEmpty()) {
slot->EnqueueSlotChangeEvent();
}
}
void
ShadowRoot::ContentRemoved(nsIContent* aChild, nsIContent* aPreviousSibling)
{
// Check to ensure that the child not an anonymous subtree root because
// even though its parent could be the host it may not be in the host's child
// list.
if (aChild->IsRootOfAnonymousSubtree()) {
return;
}
if (!aChild->IsSlotable()) {
return;
}
if (aChild->GetParent() == GetHost()) {
if (HTMLSlotElement* slot = aChild->GetAssignedSlot()) {
// If the slot is going to start showing fallback content, we need to tell
// layout about it.
if (slot->AssignedNodes().Length() == 1) {
InvalidateStyleAndLayoutOnSubtree(slot);
}
slot->RemoveAssignedNode(aChild);
slot->EnqueueSlotChangeEvent();
}
return;
}
// If parent's root is a shadow root, and parent is a slot whose assigned
// nodes is the empty list, then run signal a slot change for parent.
HTMLSlotElement* slot = HTMLSlotElement::FromNodeOrNull(aChild->GetParent());
if (slot && slot->GetContainingShadow() == this &&
slot->AssignedNodes().IsEmpty()) {
slot->EnqueueSlotChangeEvent();
}
}
ServoStyleRuleMap&
ShadowRoot::ServoStyleRuleMap()
{
if (!mStyleRuleMap) {
mStyleRuleMap = MakeUnique<mozilla::ServoStyleRuleMap>();
}
mStyleRuleMap->EnsureTable(*this);
return *mStyleRuleMap;
}
nsresult
ShadowRoot::Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
bool aPreallocateChildren) const
{
*aResult = nullptr;
return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
}