height_slider.dart

class SliderLine extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      mainAxisSize: MainAxisSize.max,
      children: List.generate(
          40,
          (i) => Expanded(
                child: Container(
                  height: 2.0,
                  decoration: BoxDecoration(
                      color: i.isEven
                          ? Theme.of(context).primaryColor
                          : Colors.white),
                ),
              )),
    );
  }
}