FPickerWheel constructor
      const
      FPickerWheel({})
     
    
Creates a picker wheel with the given children.
Implementation
const factory FPickerWheel({
  required List<Widget> children,
  bool loop,
  int flex,
  double? itemExtent,
  bool autofocus,
  FocusNode? focusNode,
  ValueChanged<bool>? onFocusChange,
  Key? key,
}) = ListWheel;