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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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21
dom/base/DocGroup.cpp
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@ -6,10 +6,13 @@
#include "mozilla/StaticPtr.h"
#include "mozilla/ClearOnShutdown.h"
#include "nsIDocShell.h"
#include "nsDOMMutationObserver.h"
namespace mozilla {
namespace dom {
AutoTArray<RefPtr<DocGroup>, 2>* DocGroup::sPendingDocGroups = nullptr;
/* static */ void
DocGroup::GetKey(nsIPrincipal* aPrincipal, nsACString& aKey)
{
@ -54,5 +57,23 @@ DocGroup::~DocGroup()
NS_IMPL_ISUPPORTS(DocGroup, nsISupports)
void
DocGroup::SignalSlotChange(const HTMLSlotElement* aSlot)
{
if (mSignalSlotList.Contains(aSlot)) {
return;
}
mSignalSlotList.AppendElement(const_cast<HTMLSlotElement*>(aSlot));
if (!sPendingDocGroups) {
// Queue a mutation observer compound microtask.
nsDOMMutationObserver::QueueMutationObserverMicroTask();
sPendingDocGroups = new AutoTArray<RefPtr<DocGroup>, 2>;
}
sPendingDocGroups->AppendElement(this);
}
}
}