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Bug 1409976 - Add slotchange event

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* Add support for `slotchange` event
* Signal `slotchange` when slot's assigned nodes changes

Tag #1375
This commit is contained in:
Matt A. Tobin 2020-04-17 07:35:48 -04:00 • committed by Roy Tam
commit af22b5cba5
9 changed files with 174 additions and 160 deletions
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69
dom/base/ShadowRoot.cpp
View file

@ -134,6 +134,7 @@ ShadowRoot::AddSlot(HTMLSlotElement* aSlot)
return;
}
bool doEnqueueSlotChange = false;
if (oldSlot && oldSlot != currentSlot) {
// Move assigned nodes from old slot to new slot.
const nsTArray<RefPtr<nsINode>>& assignedNodes = oldSlot->AssignedNodes();
@ -142,6 +143,12 @@ ShadowRoot::AddSlot(HTMLSlotElement* aSlot)
oldSlot->RemoveAssignedNode(assignedNode);
currentSlot->AppendAssignedNode(assignedNode);
doEnqueueSlotChange = true;
}
if (doEnqueueSlotChange) {
oldSlot->EnqueueSlotChangeEvent();
currentSlot->EnqueueSlotChangeEvent();
}
} else {
// Otherwise add appropriate nodes to this slot from the host.
@ -152,8 +159,13 @@ ShadowRoot::AddSlot(HTMLSlotElement* aSlot)
child->GetAttr(kNameSpaceID_None, nsGkAtoms::slot, slotName);
if (child->IsSlotable() && slotName.Equals(name)) {
currentSlot->AppendAssignedNode(child);
doEnqueueSlotChange = true;
}
}
if (doEnqueueSlotChange) {
currentSlot->EnqueueSlotChangeEvent();
}
}
}
@ -171,8 +183,13 @@ ShadowRoot::RemoveSlot(HTMLSlotElement* aSlot)
if (currentSlots->Length() == 1) {
MOZ_ASSERT(currentSlots->ElementAt(0) == aSlot);
mSlotMap.Remove(name);
aSlot->ClearAssignedNodes();
if (aSlot->AssignedNodes().Length() > 0) {
aSlot->ClearAssignedNodes();
aSlot->EnqueueSlotChangeEvent();
}
} else {
bool doEnqueueSlotChange = false;
bool doReplaceSlot = currentSlots->ElementAt(0) == aSlot;
currentSlots->RemoveElement(aSlot);
HTMLSlotElement* replacementSlot = currentSlots->ElementAt(0);
@ -186,6 +203,12 @@ ShadowRoot::RemoveSlot(HTMLSlotElement* aSlot)
aSlot->RemoveAssignedNode(assignedNode);
replacementSlot->AppendAssignedNode(assignedNode);
doEnqueueSlotChange = true;
}
if (doEnqueueSlotChange) {
aSlot->EnqueueSlotChangeEvent();
replacementSlot->EnqueueSlotChangeEvent();
}
}
}
@ -421,6 +444,12 @@ ShadowRoot::MaybeReassignElement(Element* aElement,
const HTMLSlotElement* newSlot = AssignSlotFor(aElement);
if (oldSlot != newSlot) {
if (oldSlot) {
oldSlot->EnqueueSlotChangeEvent();
}
if (newSlot) {
newSlot->EnqueueSlotChangeEvent();
}
return true;
}
}
@ -587,11 +616,24 @@ ShadowRoot::ContentInserted(nsIDocument* aDocument,
return;
}
if (!aChild->IsSlotable() || aContainer != GetHost()) {
if (!aChild->IsSlotable()) {
return;
}
AssignSlotFor(aChild);
if (aContainer && aContainer == GetHost()) {
if (const HTMLSlotElement* slot = AssignSlotFor(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::FromContentOrNull(aContainer);
if (slot && slot->GetContainingShadow() == this &&
slot->AssignedNodes().IsEmpty()) {
slot->EnqueueSlotChangeEvent();
}
}
void
@ -608,13 +650,26 @@ ShadowRoot::ContentRemoved(nsIDocument* aDocument,
return;
}
if (!aChild->IsSlotable() || aContainer != GetHost()) {
if (!aChild->IsSlotable()) {
return;
}
nsAutoString slotName;
aChild->GetAttr(kNameSpaceID_None, nsGkAtoms::slot, slotName);
UnassignSlotFor(aChild, slotName);
if (aContainer && aContainer == GetHost()) {
nsAutoString slotName;
aChild->GetAttr(kNameSpaceID_None, nsGkAtoms::slot, slotName);
if (const HTMLSlotElement* slot = UnassignSlotFor(aChild, slotName)) {
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::FromContentOrNull(aContainer);
if (slot && slot->GetContainingShadow() == this &&
slot->AssignedNodes().IsEmpty()) {
slot->EnqueueSlotChangeEvent();
}
}
nsresult