detach method
- @override
override
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
@override
void detach() {
_opacity.removeListener(_updateOpacity);
super.detach();
}