validate method
void
validate()
The rule is: 1 <= min <= preferred <= max <=remainingColumns.
Implementation
void validate() {
if (1 > min) {
throw ArgumentError("min must be >= 1", 'min');
}
if (min > preferred) {
throw ArgumentError("preferred must be >= min", 'preferred');
}
if (preferred > max) {
throw ArgumentError("max must be >= preferred", 'max');
}
if (max > remainingColumns) {
throw ArgumentError("max must be <= $remainingColumns", 'max');
}
}