adjustText method
Implementation
String adjustText(String newText) {
var effectiveText = newText;
if (effectiveText.length == 3) {
effectiveText = effectiveText.substring(2);
}
final intValue = int.tryParse(effectiveText);
if (intValue == null) return '';
if (intValue < min) return min.toString();
if (intValue > max) return max.toString();
return effectiveText;
}