extending-functions-in-flutter.dart

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extension on VoidCallback {
  Future<void> delayedCall(
    Duration duration,
  ) =>
      Future<void>.delayed(duration, this);
}

class _HomePageState extends State<HomePage>
    with SingleTickerProviderStateMixin {
  late AnimationController _counterClockwiseRotationController;

  @override
  void initState() {
    super.initState();
    _counterClockwiseRotationController = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 1),
    );

    _counterClockwiseRotationController.forward.delayedCall(
      const Duration(
        seconds: 1,
      ),
    );
  }