detach method
- @mustCallSuper
@mustCallSuper
Mark this node as detached.
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 first call their inherited detach method, and then detach all their children.
Implementation
@mustCallSuper
void detach() {
assert(_owner != null);
_owner = null;
assert(parent == null || attached == parent.attached);
}