Flutter: neu

main.dart

// Converting NeumorphicContainer to a StatefulWidget
class NeumorphicContainer extends StatefulWidget {
  final Widget child;
  final double bevel;
  final Offset blurOffset;
  final Color color;

  NeumorphicContainer({
    Key key,
    this.child,
    this.bevel = 10.0,
    this.color,
  })  : this.blurOffset = Offset(bevel / 2, bevel / 2),
        super(key: key);

  @override
  _NeumorphicContainerState createState() => _NeumorphicContainerState();
}

class _NeumorphicContainerState extends State<NeumorphicContainer> {
  // New state, representing if surface is being pressed
  bool _isPressed = false;

  // We're only really interested in down and up events,
  // for now.
  void _onPointerDown(PointerDownEvent event) {
    setState(() {
      _isPressed = true;
    });
  }

  void _onPointerUp(PointerUpEvent event) {
    setState(() {
      _isPressed = false;
    });
  }

  @override
  Widget build(BuildContext context) {
    final color = this.widget.color ?? Theme.of(context).backgroundColor;

    // Listener is almost like GestureDetector, 
    // just a bit simpler
    return Listener(
      onPointerDown: _onPointerDown,
      onPointerUp: _onPointerUp,
      child: Container(...),
    );
  }
}