toHex method
Implementation
String toHex({String? leadingHashSign, bool withAlpha = false}) =>
'${leadingHashSign ?? ''}'
'${_generateAlpha(alpha: alpha, withAlpha: withAlpha)}'
'${red.toRadixString(16).padLeft(2, '0')}'
'${green.toRadixString(16).padLeft(2, '0')}'
'${blue.toRadixString(16).padLeft(2, '0')}'
.toUpperCase();