DigitField.len constructor Null safety

DigitField.len(
  1. int len,
  2. {bool trim = false,
  3. FormFieldValidator<String>? validator,
  4. String? malformed,
  5. String? blank,
  6. String? diff,
  7. String? initialValue,
  8. TextEditingController? controller,
  9. InputDecoration? decoration,
  10. TextInputAction? textInputAction,
  11. TextStyle? style,
  12. TextDirection? textDirection,
  13. TextAlign textAlign = TextAlign.start,
  14. bool readOnly = false,
  15. String obscuringCharacter = '•',
  16. bool obscureText = false,
  17. bool autocorrect = true,
  18. int? maxLength,
  19. ValueChanged<String>? onChanged,
  20. VoidCallback? onEditingComplete,
  21. ValueChanged<String>? onFieldSubmitted,
  22. FormFieldSetter<String>? onSaved,
  23. bool? enabled,
  24. EdgeInsets scrollPadding = const EdgeInsets.all(20.0),
  25. bool enableInteractiveSelection = true,
  26. AutovalidateMode? autovalidateMode,
  27. Key? key}
)

Digit-only form field with length constraint.

len the exact number of digits; it must be > 0. trim whether or not to trim the input value. validator an optional extra validation step. blank the error message in case of blank field; if omitted, the field will not be made required. malformed the error message in case of non-digit characters. diff the error message if the number of digits is different from len.

Implementation

DigitField.len(
  int len, {
  bool trim = false,
  FormFieldValidator<String>? validator,
  String? malformed,
  String? blank,
  String? diff,
  String? initialValue,
  TextEditingController? controller,
  InputDecoration? decoration,
  TextInputAction? textInputAction,
  TextStyle? style,
  TextDirection? textDirection,
  TextAlign textAlign = TextAlign.start,
  bool readOnly = false,
  String obscuringCharacter = '•',
  bool obscureText = false,
  bool autocorrect = true,
  int? maxLength,
  ValueChanged<String>? onChanged,
  VoidCallback? onEditingComplete,
  ValueChanged<String>? onFieldSubmitted,
  FormFieldSetter<String>? onSaved,
  bool? enabled,
  EdgeInsets scrollPadding = const EdgeInsets.all(20.0),
  bool enableInteractiveSelection = true,
  AutovalidateMode? autovalidateMode,
  Key? key,
}) : this(
        validator: Pair.str(Len(len, diff: diff), validator ?? _dummy),
        malformed: malformed,
        blank: blank,
        trim: trim,
        controller: controller,
        initialValue: initialValue,
        decoration: decoration,
        textInputAction: textInputAction,
        style: style,
        textDirection: textDirection,
        textAlign: textAlign,
        readOnly: readOnly,
        obscuringCharacter: obscuringCharacter,
        obscureText: obscureText,
        autocorrect: autocorrect,
        maxLength: maxLength,
        onChanged: onChanged,
        onEditingComplete: onEditingComplete,
        onFieldSubmitted: onFieldSubmitted,
        onSaved: onSaved,
        enabled: enabled,
        scrollPadding: scrollPadding,
        enableInteractiveSelection: enableInteractiveSelection,
        autovalidateMode: autovalidateMode,
        key: key,
      );