toHex method

Implementation

String toHex() {
  final argb = toARGB32();
  final r = ((argb >> 16) & 0xFF).toRadixString(16).padLeft(2, '0');
  final g = ((argb >> 8) & 0xFF).toRadixString(16).padLeft(2, '0');
  final b = (argb & 0xFF).toRadixString(16).padLeft(2, '0');
  return '#${r.toUpperCase()}${g.toUpperCase()}${b.toUpperCase()}';
}