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 SizedBox(
    height: sizeTween.evaluate(animation),
    width: sizeTween.evaluate(animation),
    child: child,
  );
}