toColorString function
Implementation
String? toColorString(Color? color) {
return color != null
? '#'
'${((color.r * 255.0).round() & 0xff).toRadixString(16).padLeft(2, '0')}'
'${((color.g * 255.0).round() & 0xff).toRadixString(16).padLeft(2, '0')}'
'${((color.b * 255.0).round() & 0xff).toRadixString(16).padLeft(2, '0')}'
'${((color.a * 255.0).round() & 0xff).toRadixString(16).padLeft(2, '0')}'
: null;
}