Brighten extension

.dart

extension ColorExtensions on Color {
  String toHex() =>
      '#${(value & 0xFFFFFF).toRadixString(16).padLeft(6, '0').toUpperCase()}';

  bool get isDark {
    return ThemeData.estimateBrightnessForColor(this) == Brightness.dark;
  }

  Color darken([int percent = 10]) {
    assert(1 <= percent && percent <= 100);
    var f = 1 - percent / 100;
    return Color.fromARGB(
        alpha, (red * f).round(), (green * f).round(), (blue * f).round());
  }

  Color brighten([int percent = 10]) {
    assert(1 <= percent && percent <= 100);
    var p = percent / 100;
    return Color.fromARGB(alpha, red + ((255 - red) * p).round(),
        green + ((255 - green) * p).round(), blue + ((255 - blue) * p).round());
  }
}