Hex string color to MaterialColor with swatches

hexcolor.dart

import 'package:flutter/material.dart';

class HexColor extends Color {
  static int getColorFromHex(String hexColor) {
    hexColor = hexColor.toUpperCase().replaceAll("#", "");
    if (hexColor.length == 6) {
      hexColor = "FF" + hexColor;
    }
    return int.parse(hexColor, radix: 16);
  }

  HexColor(final String hexColor) : super(getColorFromHex(hexColor));
}

class HexColorMaterial extends MaterialColor {
  static int getColor(String hexColor) {
    Color color = HexColor(hexColor).withOpacity(1);
    return color.value;
  }

  static Map<int, Color> getSwatch(String hexColor) {
    Color color = Color(getColor(hexColor));
    return {
      50: color.withOpacity(.1),
      100: color.withOpacity(.2),
      200: color.withOpacity(.3),
      300: color.withOpacity(.4),
      400: color.withOpacity(.5),
      500: color.withOpacity(.6),
      600: color.withOpacity(.7),
      700: color.withOpacity(.8),
      800: color.withOpacity(.9),
      900: color.withOpacity(1),
    };
  }

  HexColorMaterial(final String hexColor)
      : super(getColor(hexColor), getSwatch(hexColor));
}

usage.dart

final theme = ThemeData(
  primarySwatch: HexColorMaterial('#000'),
);