gender_card.dart

class _GenderCardState extends State<GenderCard> {
  Gender selectedGender;

  @override
  void initState() {
    selectedGender = widget.initialGender ?? Gender.other; //<--- initialize selected gender
    super.initState();
  }

   Widget _drawMainStack() {
    return Container(
      width: double.infinity, //<--- Expand stack width
      child: Stack(
        alignment: Alignment.bottomCenter,
        children: <Widget>[
          _drawCircleIndicator(),
          GenderIconTranslated(gender: Gender.female),
          GenderIconTranslated(gender: Gender.other),
          GenderIconTranslated(gender: Gender.male),
          _drawGestureDetector(), //<--- Add gesutre detector
        ],
      ),
    );
  }

  Widget _drawCircleIndicator() {
    return Stack(
      alignment: Alignment.center,
      children: <Widget>[
        GenderCircle(),
        GenderArrow(angle: _genderAngles[selectedGender]),//<--- make arrow display current gender
      ],
    );
  }

  _drawGestureDetector() {
    return Positioned.fill(
      child: TapHandler(
        onGenderTapped: (gender) => setState(() => selectedGender = gender),
      ),
    );
  }
}