buildValue method
Implementation
Widget buildValue(BuildContext context, Duration value) {
final b = StringBuffer();
if (value.inDays > 0) b.write('Days: ${value.inDays} - ');
b.write('Time: ${(value.inHours % 24)}:'
'${(value.inMinutes % 60).toString().padLeft(2, "0")}');
return Text(b.toString());
}