detach method
override
Mark this layer as detached from its owner.
Typically called only from the parent's detach, and by the owner to mark the root of a tree as detached.
Subclasses with children should override this method to
detach all their children after calling the inherited method,
as in super.detach()
.
Implementation
@override
void detach() {
_link._unregisterLeader(this);
super.detach();
}