build method

@override Widget build(BuildContext context)

Override this method to build widgets that depend on the state of the listenable (e.g., the current value of the animation).

Implementation

@override
Widget build(BuildContext context) {
  final animation = listenable as Animation<double>;
  return Center(
    child: Container(
      margin: const EdgeInsets.symmetric(vertical: 10),
      height: animation.value,
      width: animation.value,
      child: const FlutterLogo(),
    ),
  );
}