CustomProgressBar with Flutter

.dart

import 'package:flutter/material.dart';

class StepProgressBar extends StatelessWidget {
  final int currentStep;
  final int totalSteps;
  final double leftPadding;
  final double rightPadding;
  final Color selectedColor;
  final Color unselectedColor;

  const StepProgressBar({
    Key key,
    @required this.totalSteps,
    @required this.currentStep,
    this.leftPadding = 35.0,
    this.rightPadding = 35.0,
    this.selectedColor = const Color(0xff3873B8),
    this.unselectedColor = Colors.black,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: EdgeInsets.only(
        top: 8,
        left: leftPadding,
        right: rightPadding,
        bottom: 8,
      ),
      child: Container(
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(40.0),
        ),
        child: LinearProgressIndicator(
          value: currentStep / totalSteps,
          minHeight: 4,
          valueColor: AlwaysStoppedAnimation<Color>(selectedColor),
          backgroundColor: unselectedColor.withOpacity(0.2),
        ),
      ),
    );
  }
}