Color.fromHEX constructor

Color.fromHEX(String hex)

Implementation

factory Color.fromHEX(String hex) {
  // Check if string contains '#'
  if (hex.contains('#', 1) || // Contains # after first position
      (hex.contains('#') &&
          hex.length != 7) || // Contains # but length is invalid
      (!hex.contains('#') && hex.length != 6)) {
    // Lenght is invalid
    throw Exception("Invalid hex value");
  }

  // Remove trailing #
  if (hex.contains('#')) hex = hex.substring(1);

  // Parse values
  try {
    return Color(
        int.parse(hex.substring(0, 2), radix: 16),
        int.parse(hex.substring(2, 4), radix: 16),
        int.parse(hex.substring(4, 6), radix: 16));
  } catch (e) {
    throw Exception("Invalid hex value");
  }
}