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gecko-dev/dom/base/nsDOMMutationObserver.cpp

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/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 8; -*- */
/* vim: set sw=4 ts=8 et 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 "nsDOMMutationObserver.h"
#include "mozilla/dom/OwningNonNull.h"
#include "nsError.h"
#include "nsIScriptGlobalObject.h"
#include "nsContentUtils.h"
#include "nsThreadUtils.h"
#include "nsIDOMMutationEvent.h"
#include "nsTextFragment.h"
#include "nsServiceManagerUtils.h"
nsAutoTArray<nsRefPtr<nsDOMMutationObserver>, 4>*
nsDOMMutationObserver::sScheduledMutationObservers = nullptr;
nsDOMMutationObserver* nsDOMMutationObserver::sCurrentObserver = nullptr;
uint32_t nsDOMMutationObserver::sMutationLevel = 0;
uint64_t nsDOMMutationObserver::sCount = 0;
nsAutoTArray<nsAutoTArray<nsRefPtr<nsDOMMutationObserver>, 4>, 4>*
nsDOMMutationObserver::sCurrentlyHandlingObservers = nullptr;
nsINodeList*
nsDOMMutationRecord::AddedNodes()
{
if (!mAddedNodes) {
mAddedNodes = new nsSimpleContentList(mTarget);
}
return mAddedNodes;
}
nsINodeList*
nsDOMMutationRecord::RemovedNodes()
{
if (!mRemovedNodes) {
mRemovedNodes = new nsSimpleContentList(mTarget);
}
return mRemovedNodes;
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMMutationRecord)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMMutationRecord)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMMutationRecord)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsDOMMutationRecord,
mTarget,
mPreviousSibling, mNextSibling,
mAddedNodes, mRemovedNodes,
mNext, mOwner)
// Observer
NS_IMPL_ADDREF(nsMutationReceiver)
NS_IMPL_RELEASE(nsMutationReceiver)
NS_INTERFACE_MAP_BEGIN(nsMutationReceiver)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_END
nsMutationReceiver::nsMutationReceiver(nsINode* aTarget,
nsDOMMutationObserver* aObserver)
: nsMutationReceiverBase(aTarget, aObserver)
{
mTarget->BindObject(aObserver);
}
void
nsMutationReceiver::Disconnect(bool aRemoveFromObserver)
{
if (mRegisterTarget) {
mRegisterTarget->RemoveMutationObserver(this);
mRegisterTarget = nullptr;
}
mParent = nullptr;
nsINode* target = mTarget;
mTarget = nullptr;
nsDOMMutationObserver* observer = mObserver;
mObserver = nullptr;
RemoveClones();
if (target && observer) {
if (aRemoveFromObserver) {
static_cast<nsDOMMutationObserver*>(observer)->RemoveReceiver(this);
}
// UnbindObject may delete 'this'!
target->UnbindObject(observer);
}
}
void
nsMutationReceiver::AttributeWillChange(nsIDocument* aDocument,
mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (nsAutoMutationBatch::IsBatching() ||
!ObservesAttr(aElement, aNameSpaceID, aAttribute) ||
aElement->ChromeOnlyAccess()) {
return;
}
nsDOMMutationRecord* m =
Observer()->CurrentRecord(nsGkAtoms::attributes);
NS_ASSERTION(!m->mTarget || m->mTarget == aElement,
"Wrong target!");
NS_ASSERTION(!m->mAttrName || m->mAttrName == aAttribute,
"Wrong attribute!");
if (!m->mTarget) {
m->mTarget = aElement;
m->mAttrName = aAttribute;
if (aNameSpaceID == kNameSpaceID_None) {
m->mAttrNamespace.SetIsVoid(true);
} else {
nsContentUtils::NameSpaceManager()->GetNameSpaceURI(aNameSpaceID,
m->mAttrNamespace);
}
}
if (AttributeOldValue() && m->mPrevValue.IsVoid()) {
if (!aElement->GetAttr(aNameSpaceID, aAttribute, m->mPrevValue)) {
m->mPrevValue.SetIsVoid(true);
}
}
}
void
nsMutationReceiver::CharacterDataWillChange(nsIDocument *aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
if (nsAutoMutationBatch::IsBatching() ||
!CharacterData() || !(Subtree() || aContent == Target()) ||
aContent->ChromeOnlyAccess()) {
return;
}
nsDOMMutationRecord* m =
Observer()->CurrentRecord(nsGkAtoms::characterData);
NS_ASSERTION(!m->mTarget || m->mTarget == aContent,
"Wrong target!");
if (!m->mTarget) {
m->mTarget = aContent;
}
if (CharacterDataOldValue() && m->mPrevValue.IsVoid()) {
aContent->GetText()->AppendTo(m->mPrevValue);
}
}
void
nsMutationReceiver::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
nsINode* parent = NODE_FROM(aContainer, aDocument);
bool wantsChildList = ChildList() && (Subtree() || parent == Target());
if (!wantsChildList || aFirstNewContent->ChromeOnlyAccess()) {
return;
}
if (nsAutoMutationBatch::IsBatching()) {
if (parent == nsAutoMutationBatch::GetBatchTarget()) {
nsAutoMutationBatch::UpdateObserver(Observer(), wantsChildList);
}
return;
}
nsDOMMutationRecord* m =
Observer()->CurrentRecord(nsGkAtoms::childList);
NS_ASSERTION(!m->mTarget || m->mTarget == parent,
"Wrong target!");
if (m->mTarget) {
// Already handled case.
return;
}
m->mTarget = parent;
m->mAddedNodes = new nsSimpleContentList(parent);
nsINode* n = aFirstNewContent;
while (n) {
m->mAddedNodes->AppendElement(static_cast<nsIContent*>(n));
n = n->GetNextSibling();
}
m->mPreviousSibling = aFirstNewContent->GetPreviousSibling();
}
void
nsMutationReceiver::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
nsINode* parent = NODE_FROM(aContainer, aDocument);
bool wantsChildList = ChildList() && (Subtree() || parent == Target());
if (!wantsChildList || aChild->ChromeOnlyAccess()) {
return;
}
if (nsAutoMutationBatch::IsBatching()) {
if (parent == nsAutoMutationBatch::GetBatchTarget()) {
nsAutoMutationBatch::UpdateObserver(Observer(), wantsChildList);
}
return;
}
nsDOMMutationRecord* m =
Observer()->CurrentRecord(nsGkAtoms::childList);
if (m->mTarget) {
// Already handled case.
return;
}
m->mTarget = parent;
m->mAddedNodes = new nsSimpleContentList(parent);
m->mAddedNodes->AppendElement(aChild);
m->mPreviousSibling = aChild->GetPreviousSibling();
m->mNextSibling = aChild->GetNextSibling();
}
void
nsMutationReceiver::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
if (aChild->ChromeOnlyAccess()) {
return;
}
nsINode* parent = NODE_FROM(aContainer, aDocument);
if (nsAutoMutationBatch::IsBatching()) {
if (nsAutoMutationBatch::IsRemovalDone()) {
// This can happen for example if HTML parser parses to
// context node, but needs to move elements around.
return;
}
if (nsAutoMutationBatch::GetBatchTarget() != parent) {
return;
}
bool wantsChildList = ChildList() && (Subtree() || parent == Target());
if (wantsChildList || Subtree()) {
nsAutoMutationBatch::NodeRemoved(aChild);
nsAutoMutationBatch::UpdateObserver(Observer(), wantsChildList);
}
return;
}
if (Subtree()) {
// Try to avoid creating transient observer if the node
// already has an observer observing the same set of nodes.
nsMutationReceiver* orig = GetParent() ? GetParent() : this;
if (Observer()->GetReceiverFor(aChild, false) != orig) {
bool transientExists = false;
nsCOMArray<nsMutationReceiver>* transientReceivers = nullptr;
Observer()->mTransientReceivers.Get(aChild, &transientReceivers);
if (!transientReceivers) {
transientReceivers = new nsCOMArray<nsMutationReceiver>();
Observer()->mTransientReceivers.Put(aChild, transientReceivers);
} else {
for (int32_t i = 0; i < transientReceivers->Count(); ++i) {
nsMutationReceiver* r = transientReceivers->ObjectAt(i);
if (r->GetParent() == orig) {
transientExists = true;
}
}
}
if (!transientExists) {
// Make sure the elements which are removed from the
// subtree are kept in the same observation set.
transientReceivers->AppendObject(new nsMutationReceiver(aChild, orig));
}
}
}
if (ChildList() && (Subtree() || parent == Target())) {
nsDOMMutationRecord* m =
Observer()->CurrentRecord(nsGkAtoms::childList);
if (m->mTarget) {
// Already handled case.
return;
}
m->mTarget = parent;
m->mRemovedNodes = new nsSimpleContentList(parent);
m->mRemovedNodes->AppendElement(aChild);
m->mPreviousSibling = aPreviousSibling;
m->mNextSibling = parent->GetChildAt(aIndexInContainer);
}
// We need to schedule always, so that after microtask mTransientReceivers
// can be cleared correctly.
Observer()->ScheduleForRun();
}
void nsMutationReceiver::NodeWillBeDestroyed(const nsINode *aNode)
{
NS_ASSERTION(!mParent, "Shouldn't have mParent here!");
Disconnect(true);
}
// Observer
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMMutationObserver)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsDOMMutationObserver)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
for (int32_t i = 0; i < tmp->mReceivers.Count(); ++i) {
tmp->mReceivers[i]->Disconnect(false);
}
tmp->mReceivers.Clear();
tmp->ClearPendingRecords();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mCallback)
// No need to handle mTransientReceivers
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReceivers)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFirstPendingMutation)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallback)
// No need to handle mTransientReceivers
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
nsMutationReceiver*
nsDOMMutationObserver::GetReceiverFor(nsINode* aNode, bool aMayCreate)
{
if (!aMayCreate && !aNode->MayHaveDOMMutationObserver()) {
return nullptr;
}
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
if (mReceivers[i]->Target() == aNode) {
return mReceivers[i];
}
}
if (!aMayCreate) {
return nullptr;
}
nsMutationReceiver* r = new nsMutationReceiver(aNode, this);
mReceivers.AppendObject(r);
return r;
}
void
nsDOMMutationObserver::RemoveReceiver(nsMutationReceiver* aReceiver)
{
mReceivers.RemoveObject(aReceiver);
}
void
nsDOMMutationObserver::GetAllSubtreeObserversFor(nsINode* aNode,
nsTArray<nsMutationReceiver*>&
aReceivers)
{
nsINode* n = aNode;
while (n) {
if (n->MayHaveDOMMutationObserver()) {
nsMutationReceiver* r = GetReceiverFor(n, false);
if (r && r->Subtree() && !aReceivers.Contains(r)) {
aReceivers.AppendElement(r);
// If we've found all the receivers the observer has,
// no need to search for more.
if (mReceivers.Count() == int32_t(aReceivers.Length())) {
return;
}
}
nsCOMArray<nsMutationReceiver>* transientReceivers = nullptr;
if (mTransientReceivers.Get(n, &transientReceivers) && transientReceivers) {
for (int32_t i = 0; i < transientReceivers->Count(); ++i) {
nsMutationReceiver* r = transientReceivers->ObjectAt(i);
nsMutationReceiver* parent = r->GetParent();
if (r->Subtree() && parent && !aReceivers.Contains(parent)) {
aReceivers.AppendElement(parent);
}
}
if (mReceivers.Count() == int32_t(aReceivers.Length())) {
return;
}
}
}
n = n->GetParentNode();
}
}
void
nsDOMMutationObserver::ScheduleForRun()
{
nsDOMMutationObserver::AddCurrentlyHandlingObserver(this);
if (mWaitingForRun) {
return;
}
mWaitingForRun = true;
RescheduleForRun();
}
void
nsDOMMutationObserver::RescheduleForRun()
{
if (!sScheduledMutationObservers) {
sScheduledMutationObservers = new nsAutoTArray<nsRefPtr<nsDOMMutationObserver>, 4>;
}
bool didInsert = false;
for (uint32_t i = 0; i < sScheduledMutationObservers->Length(); ++i) {
if (static_cast<nsDOMMutationObserver*>((*sScheduledMutationObservers)[i])
->mId > mId) {
sScheduledMutationObservers->InsertElementAt(i, this);
didInsert = true;
break;
}
}
if (!didInsert) {
sScheduledMutationObservers->AppendElement(this);
}
}
void
nsDOMMutationObserver::Observe(nsINode& aTarget,
const mozilla::dom::MutationObserverInit& aOptions,
mozilla::ErrorResult& aRv)
{
bool childList = aOptions.mChildList;
bool attributes =
aOptions.mAttributes.WasPassed() &&
aOptions.mAttributes.Value();
bool characterData =
aOptions.mCharacterData.WasPassed() &&
aOptions.mCharacterData.Value();
bool subtree = aOptions.mSubtree;
bool attributeOldValue =
aOptions.mAttributeOldValue.WasPassed() &&
aOptions.mAttributeOldValue.Value();
bool characterDataOldValue =
aOptions.mCharacterDataOldValue.WasPassed() &&
aOptions.mCharacterDataOldValue.Value();
if (!aOptions.mAttributes.WasPassed() &&
(aOptions.mAttributeOldValue.WasPassed() ||
aOptions.mAttributeFilter.WasPassed())) {
attributes = true;
}
if (!aOptions.mCharacterData.WasPassed() &&
aOptions.mCharacterDataOldValue.WasPassed()) {
characterData = true;
}
if (!(childList || attributes || characterData)) {
aRv.Throw(NS_ERROR_DOM_TYPE_ERR);
return;
}
if (aOptions.mAttributeOldValue.WasPassed() &&
aOptions.mAttributeOldValue.Value() &&
aOptions.mAttributes.WasPassed() &&
!aOptions.mAttributes.Value()) {
aRv.Throw(NS_ERROR_DOM_TYPE_ERR);
return;
}
if (aOptions.mAttributeFilter.WasPassed() &&
aOptions.mAttributes.WasPassed() &&
!aOptions.mAttributes.Value()) {
aRv.Throw(NS_ERROR_DOM_TYPE_ERR);
return;
}
if (aOptions.mCharacterDataOldValue.WasPassed() &&
aOptions.mCharacterDataOldValue.Value() &&
aOptions.mCharacterData.WasPassed() &&
!aOptions.mCharacterData.Value()) {
aRv.Throw(NS_ERROR_DOM_TYPE_ERR);
return;
}
nsCOMArray<nsIAtom> filters;
bool allAttrs = true;
if (aOptions.mAttributeFilter.WasPassed()) {
allAttrs = false;
const mozilla::dom::Sequence<nsString>& filtersAsString =
aOptions.mAttributeFilter.Value();
uint32_t len = filtersAsString.Length();
filters.SetCapacity(len);
for (uint32_t i = 0; i < len; ++i) {
nsCOMPtr<nsIAtom> a = do_GetAtom(filtersAsString[i]);
filters.AppendObject(a);
}
}
nsMutationReceiver* r = GetReceiverFor(&aTarget, true);
r->SetChildList(childList);
r->SetAttributes(attributes);
r->SetCharacterData(characterData);
r->SetSubtree(subtree);
r->SetAttributeOldValue(attributeOldValue);
r->SetCharacterDataOldValue(characterDataOldValue);
r->SetAttributeFilter(filters);
r->SetAllAttributes(allAttrs);
r->RemoveClones();
#ifdef DEBUG
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
NS_WARN_IF_FALSE(mReceivers[i]->Target(),
"All the receivers should have a target!");
}
#endif
}
void
nsDOMMutationObserver::Disconnect()
{
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
mReceivers[i]->Disconnect(false);
}
mReceivers.Clear();
mCurrentMutations.Clear();
ClearPendingRecords();
}
void
nsDOMMutationObserver::TakeRecords(
nsTArray<nsRefPtr<nsDOMMutationRecord> >& aRetVal)
{
aRetVal.Clear();
aRetVal.SetCapacity(mPendingMutationCount);
nsRefPtr<nsDOMMutationRecord> current;
current.swap(mFirstPendingMutation);
for (uint32_t i = 0; i < mPendingMutationCount; ++i) {
nsRefPtr<nsDOMMutationRecord> next;
current->mNext.swap(next);
*aRetVal.AppendElement() = current.forget();
current.swap(next);
}
ClearPendingRecords();
}
void
nsDOMMutationObserver::GetObservingInfo(nsTArray<Nullable<MutationObservingInfo> >& aResult)
{
aResult.SetCapacity(mReceivers.Count());
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
MutationObservingInfo& info = aResult.AppendElement()->SetValue();
nsMutationReceiver* mr = mReceivers[i];
info.mChildList = mr->ChildList();
info.mAttributes.Construct(mr->Attributes());
info.mCharacterData.Construct(mr->CharacterData());
info.mSubtree = mr->Subtree();
info.mAttributeOldValue.Construct(mr->AttributeOldValue());
info.mCharacterDataOldValue.Construct(mr->CharacterDataOldValue());
nsCOMArray<nsIAtom>& filters = mr->AttributeFilter();
if (filters.Count()) {
info.mAttributeFilter.Construct();
mozilla::dom::Sequence<nsString>& filtersAsStrings =
info.mAttributeFilter.Value();
for (int32_t j = 0; j < filters.Count(); ++j) {
filtersAsStrings.AppendElement(nsDependentAtomString(filters[j]));
}
}
info.mObservedNode = mr->Target();
}
}
// static
already_AddRefed<nsDOMMutationObserver>
nsDOMMutationObserver::Constructor(const mozilla::dom::GlobalObject& aGlobal,
mozilla::dom::MutationCallback& aCb,
mozilla::ErrorResult& aRv)
{
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.GetAsSupports());
if (!window) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
MOZ_ASSERT(window->IsInnerWindow());
nsRefPtr<nsDOMMutationObserver> observer =
new nsDOMMutationObserver(window.forget(), aCb);
return observer.forget();
}
void
nsDOMMutationObserver::HandleMutation()
{
NS_ASSERTION(nsContentUtils::IsSafeToRunScript(), "Whaat!");
NS_ASSERTION(mCurrentMutations.IsEmpty(),
"Still generating MutationRecords?");
mWaitingForRun = false;
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
mReceivers[i]->RemoveClones();
}
mTransientReceivers.Clear();
nsPIDOMWindow* outer = mOwner->GetOuterWindow();
if (!mPendingMutationCount || !outer ||
outer->GetCurrentInnerWindow() != mOwner) {
ClearPendingRecords();
return;
}
mozilla::dom::Sequence<mozilla::dom::OwningNonNull<nsDOMMutationRecord> >
mutations;
if (mutations.SetCapacity(mPendingMutationCount)) {
// We can't use TakeRecords easily here, because it deals with a
// different type of array, and we want to optimize out any extra copying.
nsRefPtr<nsDOMMutationRecord> current;
current.swap(mFirstPendingMutation);
for (uint32_t i = 0; i < mPendingMutationCount; ++i) {
nsRefPtr<nsDOMMutationRecord> next;
current->mNext.swap(next);
*mutations.AppendElement() = current;
current.swap(next);
}
}
ClearPendingRecords();
mozilla::ErrorResult rv;
mCallback->Call(this, mutations, *this, rv);
}
class AsyncMutationHandler : public nsRunnable
{
public:
NS_IMETHOD Run()
{
nsDOMMutationObserver::HandleMutations();
return NS_OK;
}
};
void
nsDOMMutationObserver::HandleMutationsInternal()
{
if (!nsContentUtils::IsSafeToRunScript()) {
nsContentUtils::AddScriptRunner(new AsyncMutationHandler());
return;
}
static nsRefPtr<nsDOMMutationObserver> sCurrentObserver;
if (sCurrentObserver && !sCurrentObserver->Suppressed()) {
// In normal cases sScheduledMutationObservers will be handled
// after previous mutations are handled. But in case some
// callback calls a sync API, which spins the eventloop, we need to still
// process other mutations happening during that sync call.
// This does *not* catch all cases, but should work for stuff running
// in separate tabs.
return;
}
nsTArray<nsRefPtr<nsDOMMutationObserver> >* suppressedObservers = nullptr;
while (sScheduledMutationObservers) {
nsAutoTArray<nsRefPtr<nsDOMMutationObserver>, 4>* observers =
sScheduledMutationObservers;
sScheduledMutationObservers = nullptr;
for (uint32_t i = 0; i < observers->Length(); ++i) {
sCurrentObserver = static_cast<nsDOMMutationObserver*>((*observers)[i]);
if (!sCurrentObserver->Suppressed()) {
sCurrentObserver->HandleMutation();
} else {
if (!suppressedObservers) {
suppressedObservers = new nsTArray<nsRefPtr<nsDOMMutationObserver> >;
}
if (!suppressedObservers->Contains(sCurrentObserver)) {
suppressedObservers->AppendElement(sCurrentObserver);
}
}
}
delete observers;
}
if (suppressedObservers) {
for (uint32_t i = 0; i < suppressedObservers->Length(); ++i) {
static_cast<nsDOMMutationObserver*>(suppressedObservers->ElementAt(i))->
RescheduleForRun();
}
delete suppressedObservers;
suppressedObservers = nullptr;
}
sCurrentObserver = nullptr;
}
nsDOMMutationRecord*
nsDOMMutationObserver::CurrentRecord(nsIAtom* aType)
{
NS_ASSERTION(sMutationLevel > 0, "Unexpected mutation level!");
while (mCurrentMutations.Length() < sMutationLevel) {
mCurrentMutations.AppendElement(static_cast<nsDOMMutationRecord*>(nullptr));
}
uint32_t last = sMutationLevel - 1;
if (!mCurrentMutations[last]) {
nsRefPtr<nsDOMMutationRecord> r = new nsDOMMutationRecord(aType, GetParentObject());
mCurrentMutations[last] = r;
AppendMutationRecord(r.forget());
ScheduleForRun();
}
NS_ASSERTION(mCurrentMutations[last]->mType == aType,
"Unexpected MutationRecord type!");
return mCurrentMutations[last];
}
nsDOMMutationObserver::~nsDOMMutationObserver()
{
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
mReceivers[i]->RemoveClones();
}
}
void
nsDOMMutationObserver::EnterMutationHandling()
{
++sMutationLevel;
}
// Leave the current mutation level (there can be several levels if in case
// of nested calls to the nsIMutationObserver methods).
// The most recent mutation record is removed from mCurrentMutations, so
// that is doesn't get modified anymore by receivers.
void
nsDOMMutationObserver::LeaveMutationHandling()
{
if (sCurrentlyHandlingObservers &&
sCurrentlyHandlingObservers->Length() == sMutationLevel) {
nsTArray<nsRefPtr<nsDOMMutationObserver> >& obs =
sCurrentlyHandlingObservers->ElementAt(sMutationLevel - 1);
for (uint32_t i = 0; i < obs.Length(); ++i) {
nsDOMMutationObserver* o =
static_cast<nsDOMMutationObserver*>(obs[i]);
if (o->mCurrentMutations.Length() == sMutationLevel) {
// It is already in pending mutations.
o->mCurrentMutations.RemoveElementAt(sMutationLevel - 1);
}
}
sCurrentlyHandlingObservers->RemoveElementAt(sMutationLevel - 1);
}
--sMutationLevel;
}
void
nsDOMMutationObserver::AddCurrentlyHandlingObserver(nsDOMMutationObserver* aObserver)
{
NS_ASSERTION(sMutationLevel > 0, "Unexpected mutation level!");
if (!sCurrentlyHandlingObservers) {
sCurrentlyHandlingObservers =
new nsAutoTArray<nsAutoTArray<nsRefPtr<nsDOMMutationObserver>, 4>, 4>;
}
while (sCurrentlyHandlingObservers->Length() < sMutationLevel) {
sCurrentlyHandlingObservers->InsertElementAt(
sCurrentlyHandlingObservers->Length());
}
uint32_t last = sMutationLevel - 1;
if (!sCurrentlyHandlingObservers->ElementAt(last).Contains(aObserver)) {
sCurrentlyHandlingObservers->ElementAt(last).AppendElement(aObserver);
}
}
void
nsDOMMutationObserver::Shutdown()
{
delete sCurrentlyHandlingObservers;
sCurrentlyHandlingObservers = nullptr;
delete sScheduledMutationObservers;
sScheduledMutationObservers = nullptr;
}
nsAutoMutationBatch*
nsAutoMutationBatch::sCurrentBatch = nullptr;
void
nsAutoMutationBatch::Done()
{
if (sCurrentBatch != this) {
return;
}
sCurrentBatch = mPreviousBatch;
if (mObservers.IsEmpty()) {
nsDOMMutationObserver::LeaveMutationHandling();
// Nothing to do.
return;
}
uint32_t len = mObservers.Length();
for (uint32_t i = 0; i < len; ++i) {
nsDOMMutationObserver* ob = mObservers[i].mObserver;
bool wantsChildList = mObservers[i].mWantsChildList;
nsRefPtr<nsSimpleContentList> removedList;
if (wantsChildList) {
removedList = new nsSimpleContentList(mBatchTarget);
}
nsTArray<nsMutationReceiver*> allObservers;
ob->GetAllSubtreeObserversFor(mBatchTarget, allObservers);
int32_t j = mFromFirstToLast ? 0 : mRemovedNodes.Length() - 1;
int32_t end = mFromFirstToLast ? mRemovedNodes.Length() : -1;
for (; j != end; mFromFirstToLast ? ++j : --j) {
nsCOMPtr<nsIContent> removed = mRemovedNodes[j];
if (removedList) {
removedList->AppendElement(removed);
}
if (allObservers.Length()) {
nsCOMArray<nsMutationReceiver>* transientReceivers = nullptr;
ob->mTransientReceivers.Get(removed, &transientReceivers);
if (!transientReceivers) {
transientReceivers = new nsCOMArray<nsMutationReceiver>();
ob->mTransientReceivers.Put(removed, transientReceivers);
}
for (uint32_t k = 0; k < allObservers.Length(); ++k) {
nsMutationReceiver* r = allObservers[k];
nsMutationReceiver* orig = r->GetParent() ? r->GetParent() : r;
if (ob->GetReceiverFor(removed, false) != orig) {
// Make sure the elements which are removed from the
// subtree are kept in the same observation set.
transientReceivers->AppendObject(new nsMutationReceiver(removed, orig));
}
}
}
}
if (wantsChildList && (mRemovedNodes.Length() || mAddedNodes.Length())) {
nsRefPtr<nsSimpleContentList> addedList =
new nsSimpleContentList(mBatchTarget);
for (uint32_t i = 0; i < mAddedNodes.Length(); ++i) {
addedList->AppendElement(mAddedNodes[i]);
}
nsRefPtr<nsDOMMutationRecord> m =
new nsDOMMutationRecord(nsGkAtoms::childList,
ob->GetParentObject());
m->mTarget = mBatchTarget;
m->mRemovedNodes = removedList;
m->mAddedNodes = addedList;
m->mPreviousSibling = mPrevSibling;
m->mNextSibling = mNextSibling;
ob->AppendMutationRecord(m.forget());
}
// Always schedule the observer so that transient receivers are
// removed correctly.
ob->ScheduleForRun();
}
nsDOMMutationObserver::LeaveMutationHandling();
}
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