fluffychat/lib/utils/string_color.dart

import 'package:flutter/material.dart';

extension StringColor on String {
  static final _colorCache = <String, Map<double, Color>>{};

  Color _getColorLight(double light) {
    var number = 0.0;
    for (var i = 0; i < length; i++) {
      number += codeUnitAt(i);
    }
    number = (number % 12) * 25.5;
    return HSLColor.fromAHSL(1, number, 1, light).toColor();
  }

  Color get color {
    _colorCache[this] ??= {};
    return _colorCache[this]![0.35] ??= _getColorLight(0.35);
  }

  Color get darkColor {
    _colorCache[this] ??= {};
    return _colorCache[this]![0.2] ??= _getColorLight(0.2);
  }

  Color get lightColor {
    _colorCache[this] ??= {};
    return _colorCache[this]![0.7] ??= _getColorLight(0.7);
  }
}