decorate method

Implementation

@override
List<Decorator> decorate(BuildContext context) {
  return [
    Decorator(
      (context, story) {
        return ListenableBuilder(
          listenable: this,
          builder: (context, child) => KeyedSubtree(
            key: ValueKey(value),
            child: story,
          ),
        );
      },
    )
  ];
}