validate method

@override FutureOr<ValidationResult?> validate(BuildContext context, T? 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, T? value, FormValidationMode state) {
  var localizations = Localizations.of(context, ShadcnLocalizations);
  var result = validator.validate(context, value, state);
  if (result is Future<ValidationResult?>) {
    return result.then((value) {
      if (value == null) {
        return InvalidResult(message ?? localizations.invalidValue,
            state: state);
      }
      return null;
    });
  } else if (result == null) {
    return InvalidResult(message ?? localizations.invalidValue, state: state);
  }
  return null;
}