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(NS_LITERAL_STRING("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::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
nsINode* parent = NODE_FROM(aContainer, aDocument);
bool wantsChildList =
ChildList() &&
((Subtree() && RegisterTarget()->SubtreeRoot() == parent->SubtreeRoot()) ||
parent == Target());
if (!wantsChildList || !IsObservable(aFirstNewContent)) {
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::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(NS_LITERAL_STRING("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();
}
