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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
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/DocumentFragment.h"
#include "ChildIterator.h"
#include "nsContentUtils.h"
#include "nsINode.h"
#include "nsWindowSizes.h"
#include "mozilla/dom/DirectionalityUtils.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLDetailsElement.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "mozilla/dom/HTMLSummaryElement.h"
#include "mozilla/dom/MutationObservers.h"
#include "mozilla/dom/Text.h"
#include "mozilla/dom/TreeOrderedArrayInlines.h"
#include "mozilla/dom/UnbindContext.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/IdentifierMapEntry.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/ServoStyleRuleMap.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/dom/StyleSheetList.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_CYCLE_COLLECTION_CLASS(ShadowRoot)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ShadowRoot, DocumentFragment)
DocumentOrShadowRoot::Traverse(tmp, cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ShadowRoot)
DocumentOrShadowRoot::Unlink(tmp);
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_END_INHERITING(DocumentFragment)
NS_IMPL_ADDREF_INHERITED(ShadowRoot, DocumentFragment)
NS_IMPL_RELEASE_INHERITED(ShadowRoot, DocumentFragment)
ShadowRoot::ShadowRoot(Element* aElement, ShadowRootMode aMode,
Element::DelegatesFocus aDelegatesFocus,
SlotAssignmentMode aSlotAssignment,
IsClonable aIsClonable, Declarative aDeclarative,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: DocumentFragment(std::move(aNodeInfo)),
DocumentOrShadowRoot(this),
mMode(aMode),
mDelegatesFocus(aDelegatesFocus),
mSlotAssignment(aSlotAssignment),
mIsDetailsShadowTree(aElement->IsHTMLElement(nsGkAtoms::details)),
mIsAvailableToElementInternals(false),
mIsDeclarative(aDeclarative),
mIsClonable(aIsClonable) {
// nsINode.h relies on this.
MOZ_ASSERT(static_cast<nsINode*>(this) == reinterpret_cast<nsINode*>(this));
MOZ_ASSERT(static_cast<nsIContent*>(this) ==
reinterpret_cast<nsIContent*>(this));
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);
if (Host()->IsInNativeAnonymousSubtree()) {
// NOTE(emilio): We could consider just propagating the
// IN_NATIVE_ANONYMOUS_SUBTREE flag (not making this an anonymous root), but
// that breaks the invariant that if two nodes have the same
// NativeAnonymousSubtreeRoot() they are in the same DOM tree, which we rely
// on a couple places and would need extra fixes.
//
// it.
SetIsNativeAnonymousRoot();
}
Bind();
ExtendedDOMSlots()->mContainingShadow = this;
}
ShadowRoot::~ShadowRoot() {
if (IsInComposedDoc()) {
OwnerDoc()->RemoveComposedDocShadowRoot(*this);
}
MOZ_DIAGNOSTIC_ASSERT(!OwnerDoc()->IsComposedDocShadowRoot(*this));
UnsetFlags(NODE_IS_IN_SHADOW_TREE);
// nsINode destructor expects mSubtreeRoot == this.
SetSubtreeRootPointer(this);
}
MOZ_DEFINE_MALLOC_SIZE_OF(ShadowRootAuthorStylesMallocSizeOf)
MOZ_DEFINE_MALLOC_ENCLOSING_SIZE_OF(ShadowRootAuthorStylesMallocEnclosingSizeOf)
void ShadowRoot::AddSizeOfExcludingThis(nsWindowSizes& aSizes,
size_t* aNodeSize) const {
DocumentFragment::AddSizeOfExcludingThis(aSizes, aNodeSize);
DocumentOrShadowRoot::AddSizeOfExcludingThis(aSizes);
aSizes.mLayoutShadowDomAuthorStyles += Servo_AuthorStyles_SizeOfIncludingThis(
ShadowRootAuthorStylesMallocSizeOf,
ShadowRootAuthorStylesMallocEnclosingSizeOf, mServoStyles.get());
}
JSObject* ShadowRoot::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return mozilla::dom::ShadowRoot_Binding::Wrap(aCx, this, aGivenProto);
}
void ShadowRoot::NodeInfoChanged(Document* aOldDoc) {
DocumentFragment::NodeInfoChanged(aOldDoc);
Document* newDoc = OwnerDoc();
const bool fromOrToTemplate =
aOldDoc->GetTemplateContentsOwnerIfExists() == newDoc ||
newDoc->GetTemplateContentsOwnerIfExists() == aOldDoc;
if (!fromOrToTemplate) {
ClearAdoptedStyleSheets();
}
}
void ShadowRoot::CloneInternalDataFrom(ShadowRoot* aOther) {
if (aOther->IsRootOfNativeAnonymousSubtree()) {
SetIsNativeAnonymousRoot();
}
if (aOther->IsUAWidget()) {
SetIsUAWidget();
}
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, this);
if (clonedSheet) {
AppendStyleSheet(*clonedSheet.get());
}
}
}
CloneAdoptedSheetsFrom(*aOther);
}
nsresult ShadowRoot::Bind() {
MOZ_ASSERT(!IsInComposedDoc(), "Forgot to unbind?");
if (Host()->IsInComposedDoc()) {
SetIsConnected(true);
Document* doc = OwnerDoc();
doc->AddComposedDocShadowRoot(*this);
// If our stylesheets somehow mutated when we were disconnected, we need to
// ensure that our style data gets flushed as appropriate.
if (mServoStyles && Servo_AuthorStyles_IsDirty(mServoStyles.get())) {
doc->RecordShadowStyleChange(*this);
}
}
BindContext context(*this);
for (nsIContent* child = GetFirstChild(); child;
child = child->GetNextSibling()) {
nsresult rv = child->BindToTree(context, *this);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
void ShadowRoot::Unbind() {
if (IsInComposedDoc()) {
SetIsConnected(false);
OwnerDoc()->RemoveComposedDocShadowRoot(*this);
}
UnbindContext context(*this);
for (nsIContent* child = GetFirstChild(); child;
child = child->GetNextSibling()) {
child->UnbindFromTree(context);
}
MutationObservers::NotifyParentChainChanged(this);
}
void ShadowRoot::Unattach() {
MOZ_ASSERT(!HasSlots(), "Won't work!");
if (!GetHost()) {
// It is possible that we've been unlinked already. In such case host
// should have called Unbind and ShadowRoot's own unlink.
return;
}
Unbind();
SetHost(nullptr);
}
void ShadowRoot::InvalidateStyleAndLayoutOnSubtree(Element* aElement) {
MOZ_ASSERT(aElement);
Document* doc = GetComposedDoc();
if (!doc) {
return;
}
PresShell* presShell = doc->GetPresShell();
if (!presShell) {
return;
}
presShell->DestroyFramesForAndRestyle(aElement);
}
void ShadowRoot::PartAdded(const Element& aPart) {
MOZ_ASSERT(aPart.HasPartAttribute());
MOZ_ASSERT(!mParts.Contains(&aPart));
mParts.AppendElement(&aPart);
}
void ShadowRoot::PartRemoved(const Element& aPart) {
MOZ_ASSERT(mParts.Contains(&aPart));
mParts.RemoveElement(&aPart);
MOZ_ASSERT(!mParts.Contains(&aPart));
}
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);
SlotArray& currentSlots = *mSlotMap.GetOrInsertNew(name);
size_t index = currentSlots.Insert(*aSlot);
// For Named slots, slottables are inserted into the other slot
// which has the same name already, however it's not the case
// for manual slots
if (index != 0 && SlotAssignment() == SlotAssignmentMode::Named) {
return;
}
HTMLSlotElement* oldSlot = currentSlots->SafeElementAt(1);
if (SlotAssignment() == SlotAssignmentMode::Named) {
if (oldSlot) {
MOZ_DIAGNOSTIC_ASSERT(oldSlot != aSlot);
// 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->AsContent());
aSlot->AppendAssignedNode(*assignedNode->AsContent());
doEnqueueSlotChange = true;
}
if (doEnqueueSlotChange) {
oldSlot->EnqueueSlotChangeEvent();
aSlot->EnqueueSlotChangeEvent();
SlotStateChanged(oldSlot);
SlotStateChanged(aSlot);
}
} 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;
GetSlotNameFor(*child, slotName);
if (!child->IsSlotable() || !slotName.Equals(name)) {
continue;
}
doEnqueueSlotChange = true;
aSlot->AppendAssignedNode(*child);
}
if (doEnqueueSlotChange) {
aSlot->EnqueueSlotChangeEvent();
SlotStateChanged(aSlot);
}
}
} else {
bool doEnqueueSlotChange = false;
for (const auto& node : aSlot->ManuallyAssignedNodes()) {
if (GetHost() != node->GetParent()) {
continue;
}
MOZ_ASSERT(node->IsContent(),
"Manually assigned nodes should be an element or a text");
nsIContent* content = node->AsContent();
aSlot->AppendAssignedNode(*content);
doEnqueueSlotChange = true;
}
if (doEnqueueSlotChange) {
aSlot->EnqueueSlotChangeEvent();
SlotStateChanged(aSlot);
}
}
}
void ShadowRoot::RemoveSlot(HTMLSlotElement* aSlot) {
MOZ_ASSERT(aSlot);
nsAutoString name;
aSlot->GetName(name);
MOZ_ASSERT(mSlotMap.Get(name));
SlotArray& currentSlots = *mSlotMap.Get(name);
MOZ_DIAGNOSTIC_ASSERT(currentSlots->Contains(aSlot),
"Slot to de-register wasn't found?");
if (currentSlots->Length() == 1) {
MOZ_ASSERT_IF(SlotAssignment() == SlotAssignmentMode::Named,
currentSlots->ElementAt(0) == aSlot);
InvalidateStyleAndLayoutOnSubtree(aSlot);
mSlotMap.Remove(name);
if (!aSlot->AssignedNodes().IsEmpty()) {
aSlot->ClearAssignedNodes();
aSlot->EnqueueSlotChangeEvent();
}
return;
}
if (SlotAssignment() == SlotAssignmentMode::Manual) {
InvalidateStyleAndLayoutOnSubtree(aSlot);
if (!aSlot->AssignedNodes().IsEmpty()) {
aSlot->ClearAssignedNodes();
aSlot->EnqueueSlotChangeEvent();
}
}
const bool wasFirstSlot = currentSlots->ElementAt(0) == aSlot;
currentSlots.RemoveElement(*aSlot);
if (!wasFirstSlot || SlotAssignment() == SlotAssignmentMode::Manual) {
return;
}
// Move assigned nodes from removed slot to the next slot in
// tree order with the same name.
InvalidateStyleAndLayoutOnSubtree(aSlot);
HTMLSlotElement* replacementSlot = currentSlots->ElementAt(0);
const nsTArray<RefPtr<nsINode>>& assignedNodes = aSlot->AssignedNodes();
if (assignedNodes.IsEmpty()) {
return;
}
InvalidateStyleAndLayoutOnSubtree(replacementSlot);
while (!assignedNodes.IsEmpty()) {
nsINode* assignedNode = assignedNodes[0];
aSlot->RemoveAssignedNode(*assignedNode->AsContent());
replacementSlot->AppendAssignedNode(*assignedNode->AsContent());
}
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 (!aSheet.IsApplicable()) {
return;
}
MOZ_ASSERT(mServoStyles);
if (mStyleRuleMap) {
mStyleRuleMap->RuleAdded(aSheet, aRule);
}
if (aRule.IsIncompleteImportRule()) {
return;
}
Servo_AuthorStyles_ForceDirty(mServoStyles.get());
ApplicableRulesChanged();
}
void ShadowRoot::RuleRemoved(StyleSheet& aSheet, css::Rule& aRule) {
if (!aSheet.IsApplicable()) {
return;
}
MOZ_ASSERT(mServoStyles);
if (mStyleRuleMap) {
mStyleRuleMap->RuleRemoved(aSheet, aRule);
}
Servo_AuthorStyles_ForceDirty(mServoStyles.get());
ApplicableRulesChanged();
}
void ShadowRoot::RuleChanged(StyleSheet& aSheet, css::Rule*,
StyleRuleChangeKind) {
if (!aSheet.IsApplicable()) {
return;
}
MOZ_ASSERT(mServoStyles);
Servo_AuthorStyles_ForceDirty(mServoStyles.get());
ApplicableRulesChanged();
}
void ShadowRoot::ImportRuleLoaded(CSSImportRule&, StyleSheet& aSheet) {
if (mStyleRuleMap) {
mStyleRuleMap->SheetAdded(aSheet);
}
if (!aSheet.IsApplicable()) {
return;
}
// TODO(emilio): Could handle it like a regular sheet insertion, I guess, to
// avoid throwing away the whole style data.
Servo_AuthorStyles_ForceDirty(mServoStyles.get());
ApplicableRulesChanged();
}
// We don't need to do anything else than forwarding to the document if
// necessary.
void ShadowRoot::SheetCloned(StyleSheet& aSheet) {
if (Document* doc = GetComposedDoc()) {
if (PresShell* shell = doc->GetPresShell()) {
shell->StyleSet()->SheetCloned(aSheet);
}
}
}
void ShadowRoot::ApplicableRulesChanged() {
if (Document* doc = GetComposedDoc()) {
doc->RecordShadowStyleChange(*this);
}
}
void ShadowRoot::InsertSheetAt(size_t aIndex, StyleSheet& aSheet) {
DocumentOrShadowRoot::InsertSheetAt(aIndex, aSheet);
if (aSheet.IsApplicable()) {
InsertSheetIntoAuthorData(aIndex, aSheet, mStyleSheets);
}
}
StyleSheet* FirstApplicableAdoptedStyleSheet(
const nsTArray<RefPtr<StyleSheet>>& aList) {
size_t i = 0;
for (StyleSheet* sheet : aList) {
// Deal with duplicate sheets by only considering the last one.
if (sheet->IsApplicable() && MOZ_LIKELY(aList.LastIndexOf(sheet) == i)) {
return sheet;
}
i++;
}
return nullptr;
}
void ShadowRoot::InsertSheetIntoAuthorData(
size_t aIndex, StyleSheet& aSheet,
const nsTArray<RefPtr<StyleSheet>>& aList) {
MOZ_ASSERT(aSheet.IsApplicable());
MOZ_ASSERT(aList[aIndex] == &aSheet);
MOZ_ASSERT(aList.LastIndexOf(&aSheet) == aIndex);
MOZ_ASSERT(&aList == &mAdoptedStyleSheets || &aList == &mStyleSheets);
if (!mServoStyles) {
mServoStyles.reset(Servo_AuthorStyles_Create());
}
if (mStyleRuleMap) {
mStyleRuleMap->SheetAdded(aSheet);
}
auto changedOnExit =
mozilla::MakeScopeExit([&] { ApplicableRulesChanged(); });
for (size_t i = aIndex + 1; i < aList.Length(); ++i) {
StyleSheet* beforeSheet = aList.ElementAt(i);
if (!beforeSheet->IsApplicable()) {
continue;
}
// If this is a duplicate adopted stylesheet that is not in the right
// position (the last one) then we skip over it. Otherwise we're done.
if (&aList == &mAdoptedStyleSheets &&
MOZ_UNLIKELY(aList.LastIndexOf(beforeSheet) != i)) {
continue;
}
Servo_AuthorStyles_InsertStyleSheetBefore(mServoStyles.get(), &aSheet,
beforeSheet);
return;
}
if (mAdoptedStyleSheets.IsEmpty() || &aList == &mAdoptedStyleSheets) {
Servo_AuthorStyles_AppendStyleSheet(mServoStyles.get(), &aSheet);
return;
}
if (auto* before = FirstApplicableAdoptedStyleSheet(mAdoptedStyleSheets)) {
Servo_AuthorStyles_InsertStyleSheetBefore(mServoStyles.get(), &aSheet,
before);
} else {
Servo_AuthorStyles_AppendStyleSheet(mServoStyles.get(), &aSheet);
}
}
// FIXME(emilio): This needs to notify document observers and such,
// presumably.
void ShadowRoot::StyleSheetApplicableStateChanged(StyleSheet& aSheet) {
auto& sheetList = aSheet.IsConstructed() ? mAdoptedStyleSheets : mStyleSheets;
int32_t index = sheetList.LastIndexOf(&aSheet);
if (index < 0) {
// NOTE(emilio): @import sheets are handled in the relevant RuleAdded
// notification, which only notifies after the sheet is loaded.
//
// This setup causes weirdness in other places, we may want to fix this in
MOZ_DIAGNOSTIC_ASSERT(aSheet.GetParentSheet(),
"It'd better be an @import sheet");
return;
}
if (aSheet.IsApplicable()) {
InsertSheetIntoAuthorData(size_t(index), aSheet, sheetList);
} else {
MOZ_ASSERT(mServoStyles);
if (mStyleRuleMap) {
mStyleRuleMap->SheetRemoved(aSheet);
}
Servo_AuthorStyles_RemoveStyleSheet(mServoStyles.get(), &aSheet);
ApplicableRulesChanged();
}
}
void ShadowRoot::RemoveSheetFromStyles(StyleSheet& aSheet) {
MOZ_ASSERT(aSheet.IsApplicable());
MOZ_ASSERT(mServoStyles);
if (mStyleRuleMap) {
mStyleRuleMap->SheetRemoved(aSheet);
}
Servo_AuthorStyles_RemoveStyleSheet(mServoStyles.get(), &aSheet);
ApplicableRulesChanged();
}
void ShadowRoot::AddToIdTable(Element* aElement, nsAtom* aId) {
IdentifierMapEntry* entry = mIdentifierMap.PutEntry(aId);
if (entry) {
entry->AddIdElement(aElement);
}
}
void ShadowRoot::RemoveFromIdTable(Element* aElement, nsAtom* aId) {
IdentifierMapEntry* entry = mIdentifierMap.GetEntry(aId);
if (entry) {
entry->RemoveIdElement(aElement);
if (entry->IsEmpty()) {
mIdentifierMap.RemoveEntry(entry);
}
}
}
void ShadowRoot::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
aVisitor.mCanHandle = true;
aVisitor.mRootOfClosedTree = IsClosed();
// Inform that we're about to exit the current scope.
aVisitor.mRelatedTargetRetargetedInCurrentScope = false;
if (!aVisitor.mEvent->mFlags.mComposed) {
nsCOMPtr<nsIContent> originalTarget =
nsIContent::FromEventTargetOrNull(aVisitor.mEvent->mOriginalTarget);
if (originalTarget && 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;
}
}
nsIContent* shadowHost = GetHost();
aVisitor.SetParentTarget(shadowHost, false);
nsCOMPtr<nsIContent> content(
nsIContent::FromEventTargetOrNull(aVisitor.mEvent->mTarget));
if (content && content->GetContainingShadow() == this) {
aVisitor.mEventTargetAtParent = shadowHost;
}
}
void ShadowRoot::GetSlotNameFor(const nsIContent& aContent,
nsAString& aName) const {
if (mIsDetailsShadowTree) {
const auto* summary = HTMLSummaryElement::FromNode(aContent);
if (summary && summary->IsMainSummary()) {
aName.AssignLiteral("internal-main-summary");
}
// Otherwise use the default slot.
return;
}
// Note that if slot attribute is missing, assign it to the first default
// slot, if exists.
if (const Element* element = Element::FromNode(aContent)) {
element->GetAttr(nsGkAtoms::slot, aName);
}
}
ShadowRoot::SlotInsertionPoint ShadowRoot::SlotInsertionPointFor(
nsIContent& aContent) {
HTMLSlotElement* slot = nullptr;
if (SlotAssignment() == SlotAssignmentMode::Manual) {
slot = aContent.GetManualSlotAssignment();
if (!slot || slot->GetContainingShadow() != this) {
return {};
}
} else {
nsAutoString slotName;
GetSlotNameFor(aContent, slotName);
SlotArray* slots = mSlotMap.Get(slotName);
if (!slots) {
return {};
}
slot = (*slots)->ElementAt(0);
}
MOZ_ASSERT(slot);
if (SlotAssignment() == SlotAssignmentMode::Named) {
if (!aContent.GetNextSibling()) {
// aContent is the last child, no need to loop through the assigned nodes,
// we're necessarily the last one.
//
// This prevents multiple appends into the host from getting quadratic.
return {slot, Nothing()};
}
} else {
// For manual slots, if aContent is the last element, we return Nothing
// because we just need to append the element to the assigned nodes. No need
// to return an index.
if (slot->ManuallyAssignedNodes().SafeLastElement(nullptr) == &aContent) {
return {slot, Nothing()};
}
}
// Find the appropriate position in the assigned node list for the newly
// assigned content.
if (SlotAssignment() == SlotAssignmentMode::Manual) {
const nsTArray<nsINode*>& manuallyAssignedNodes =
slot->ManuallyAssignedNodes();
auto index = manuallyAssignedNodes.IndexOf(&aContent);
if (index != manuallyAssignedNodes.NoIndex) {
return {slot, Some(index)};
}
} else {
const nsTArray<RefPtr<nsINode>>& assignedNodes = slot->AssignedNodes();
nsIContent* currentContent = GetHost()->GetFirstChild();
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) {
return {slot, Some(i)};
}
currentContent = currentContent->GetNextSibling();
}
}
}
return {slot, Nothing()};
}
void ShadowRoot::MaybeReassignContent(nsIContent& aElementOrText) {
MOZ_ASSERT(aElementOrText.GetParent() == GetHost());
MOZ_ASSERT(aElementOrText.IsElement() || aElementOrText.IsText());
HTMLSlotElement* oldSlot = aElementOrText.GetAssignedSlot();
SlotInsertionPoint assignment = SlotInsertionPointFor(aElementOrText);
if (assignment.mSlot == oldSlot) {
// Nothing to do here.
return;
}
// The layout invalidation piece for Manual slots is handled in
// HTMLSlotElement::Assign
if (aElementOrText.IsElement() &&
SlotAssignment() == SlotAssignmentMode::Named) {
if (Document* doc = GetComposedDoc()) {
if (RefPtr<PresShell> presShell = doc->GetPresShell()) {
presShell->SlotAssignmentWillChange(*aElementOrText.AsElement(),
oldSlot, assignment.mSlot);
}
}
}
if (oldSlot) {
if (SlotAssignment() == SlotAssignmentMode::Named) {
oldSlot->RemoveAssignedNode(aElementOrText);
// Don't need to EnqueueSlotChangeEvent for Manual slots because it
// needs to be done in tree order, so
// HTMLSlotElement::Assign will handle it explicitly.
oldSlot->EnqueueSlotChangeEvent();
} else {
oldSlot->RemoveManuallyAssignedNode(aElementOrText);
}
}
if (assignment.mSlot) {
if (assignment.mIndex) {
assignment.mSlot->InsertAssignedNode(*assignment.mIndex, aElementOrText);
} else {
assignment.mSlot->AppendAssignedNode(aElementOrText);
}
// Similar as above, HTMLSlotElement::Assign handles enqueuing
// slotchange event.
if (SlotAssignment() == SlotAssignmentMode::Named) {
assignment.mSlot->EnqueueSlotChangeEvent();
}
}
}
void ShadowRoot::MaybeReassignMainSummary(SummaryChangeReason aReason) {
MOZ_ASSERT(mIsDetailsShadowTree);
if (aReason == SummaryChangeReason::Insertion) {
// We've inserted a summary element, may need to remove the existing one.
SlotArray* array = mSlotMap.Get(u"internal-main-summary"_ns);
MOZ_RELEASE_ASSERT(array && (*array)->Length() == 1);
HTMLSlotElement* slot = (*array)->ElementAt(0);
auto* summary = HTMLSummaryElement::FromNodeOrNull(
slot->AssignedNodes().SafeElementAt(0));
if (summary) {
MaybeReassignContent(*summary);
}
} else if (MOZ_LIKELY(GetHost())) {
// We need to null-check GetHost() in case we're unlinking already.
auto* details = HTMLDetailsElement::FromNode(Host());
MOZ_DIAGNOSTIC_ASSERT(details);
// We've removed a summary element, we may need to assign the new one.
if (HTMLSummaryElement* newMainSummary = details->GetFirstSummary()) {
MaybeReassignContent(*newMainSummary);
}
}
}
Element* ShadowRoot::GetActiveElement() {
return GetRetargetedFocusedElement();
}
nsINode* ShadowRoot::ImportNodeAndAppendChildAt(nsINode& aParentNode,
nsINode& aNode, bool aDeep,
mozilla::ErrorResult& rv) {
MOZ_ASSERT(IsUAWidget());
if (aParentNode.SubtreeRoot() != this) {
rv.Throw(NS_ERROR_INVALID_ARG);
return nullptr;
}
RefPtr<nsINode> node = OwnerDoc()->ImportNode(aNode, aDeep, rv);
if (rv.Failed()) {
return nullptr;
}
return aParentNode.AppendChild(*node, rv);
}
nsINode* ShadowRoot::CreateElementAndAppendChildAt(nsINode& aParentNode,
const nsAString& aTagName,
mozilla::ErrorResult& rv) {
MOZ_ASSERT(IsUAWidget());
if (aParentNode.SubtreeRoot() != this) {
rv.Throw(NS_ERROR_INVALID_ARG);
return nullptr;
}
// This option is not exposed to UA Widgets
ElementCreationOptionsOrString options;
RefPtr<nsINode> node = OwnerDoc()->CreateElement(aTagName, options, rv);
if (rv.Failed()) {
return nullptr;
}
return aParentNode.AppendChild(*node, rv);
}
void ShadowRoot::MaybeUnslotHostChild(nsIContent& aChild) {
// Need to null-check the host because we may be unlinked already.
MOZ_ASSERT(!GetHost() || aChild.GetParent() == GetHost());
HTMLSlotElement* slot = aChild.GetAssignedSlot();
if (!slot) {
return;
}
MOZ_DIAGNOSTIC_ASSERT(!aChild.IsRootOfNativeAnonymousSubtree(),
"How did aChild end up assigned to a slot?");
// If the slot is going to start showing fallback content, we need to tell
// layout about it.
if (slot->AssignedNodes().Length() == 1 && slot->HasChildren()) {
InvalidateStyleAndLayoutOnSubtree(slot);
}
slot->RemoveAssignedNode(aChild);
slot->EnqueueSlotChangeEvent();
if (mIsDetailsShadowTree && aChild.IsHTMLElement(nsGkAtoms::summary)) {
MaybeReassignMainSummary(SummaryChangeReason::Deletion);
}
}
void ShadowRoot::MaybeSlotHostChild(nsIContent& aChild) {
MOZ_ASSERT(aChild.GetParent() == GetHost());
// 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.IsRootOfNativeAnonymousSubtree()) {
return;
}
if (!aChild.IsSlotable()) {
return;
}
if (mIsDetailsShadowTree && aChild.IsHTMLElement(nsGkAtoms::summary)) {
MaybeReassignMainSummary(SummaryChangeReason::Insertion);
}
SlotInsertionPoint assignment = SlotInsertionPointFor(aChild);
if (!assignment.mSlot) {
return;
}
// Fallback content will go away, let layout know.
if (assignment.mSlot->AssignedNodes().IsEmpty() &&
assignment.mSlot->HasChildren()) {
InvalidateStyleAndLayoutOnSubtree(assignment.mSlot);
}
if (assignment.mIndex) {
assignment.mSlot->InsertAssignedNode(*assignment.mIndex, aChild);
} else {
assignment.mSlot->AppendAssignedNode(aChild);
}
assignment.mSlot->EnqueueSlotChangeEvent();
}
ServoStyleRuleMap& ShadowRoot::ServoStyleRuleMap() {
if (!mStyleRuleMap) {
mStyleRuleMap = MakeUnique<mozilla::ServoStyleRuleMap>();
}
mStyleRuleMap->EnsureTable(*this);
return *mStyleRuleMap;
}
nsresult ShadowRoot::Clone(dom::NodeInfo* aNodeInfo, nsINode** aResult) const {
*aResult = nullptr;
return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
}
void ShadowRoot::SetHTMLUnsafe(const nsAString& aHTML) {
RefPtr<Element> host = GetHost();
nsContentUtils::SetHTMLUnsafe(this, host, aHTML);
}