validate method

@override FutureOr<ValidationResult?> validate(BuildContext context, String? value, FormValidationMode state)

Validates the given value and returns a validation result.

This method performs the actual validation logic and should return null if the value is valid, or a ValidationResult describing the validation error if invalid.

Parameters:

• context (BuildContext): The build context for localization access
• value (T?): The value to validate (may be null)
• lifecycle (FormValidationMode): The current validation trigger mode

Returns a FutureOr<ValidationResult?> that is null for valid values or contains error information for invalid values.

Implementation

@override
FutureOr<ValidationResult?> validate(
    BuildContext context, String? value, FormValidationMode state) {
  if (value == null) {
    if (min != null) {
      return InvalidResult(
          message ??
              Localizations.of(context, ShadcnLocalizations)
                  .formLengthLessThan(min!),
          state: state);
    }
    return null;
  }
  ShadcnLocalizations localizations =
      Localizations.of(context, ShadcnLocalizations);
  if (min != null && value.length < min!) {
    return InvalidResult(message ?? localizations.formLengthLessThan(min!),
        state: state);
  }
  if (max != null && value.length > max!) {
    return InvalidResult(message ?? localizations.formLengthGreaterThan(max!),
        state: state);
  }
  return null;
}