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) {
  if (value == null) {
    var localizations = Localizations.of(context, ShadcnLocalizations);
    return InvalidResult(message ?? localizations.formNotEmpty, state: state);
  }
  return null;
}