NumField class Null safety

Numeric Form Field.

The Numeric field accepts integer and floating-point values. Letters and most symbols cannot be entered into this type of field. However, the negative sign ('-'), the positive sign ('+'), and '.' or ',' are allowed.

Non-numeric characters must somehow be filtered out so that they do not appear in the form field. This is accomplished by setting the following:

• Num as the validator to limit data to numeric values.
• TextInputType.numberWithOptions as the keyboardType.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• NumField

Constructors

NumField({bool trim = false, FormFieldValidator<String>? validator, String? blank, String? malformed, 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, List<TextInputFormatter>? inputFormatters, bool? enabled, EdgeInsets scrollPadding = const EdgeInsets.all(20.0), bool enableInteractiveSelection = true, AutovalidateMode? autovalidateMode, Key? key})

Numeric Form Field.

NumField.max(num max, {bool trim = false, FormFieldValidator<String>? validator, String? blank, String? malformed, String? large, String? initialValue, TextEditingController? controller, InputDecoration? decoration = const InputDecoration(), 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, List<TextInputFormatter>? inputFormatters, bool? enabled, EdgeInsets scrollPadding = const EdgeInsets.all(20.0), bool enableInteractiveSelection = true, AutovalidateMode? autovalidateMode, Key? key})

Constrains data to numeric values that are less than or equal to max.

NumField.min(num min, {bool trim = false, FormFieldValidator<String>? validator, String? blank, String? malformed, String? small, 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, List<TextInputFormatter>? inputFormatters, bool? enabled, EdgeInsets scrollPadding = const EdgeInsets.all(20.0), bool enableInteractiveSelection = true, AutovalidateMode? autovalidateMode, Key? key})

Constrains data to numbers greater than or equal to min.

NumField.neg({bool trim = false, FormFieldValidator<String>? validator, String? blank, String? malformed, String? pos, 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, List<TextInputFormatter>? inputFormatters, bool? enabled, EdgeInsets scrollPadding = const EdgeInsets.all(20.0), bool enableInteractiveSelection = true, AutovalidateMode? autovalidateMode, Key? key})

Constrains entered data to negative numbers.

NumField.pos({bool trim = false, FormFieldValidator<String>? validator, String? blank, String? malformed, String? neg, 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, List<TextInputFormatter>? inputFormatters, bool? enabled, EdgeInsets scrollPadding = const EdgeInsets.all(20.0), bool enableInteractiveSelection = true, AutovalidateMode? autovalidateMode, Key? key})

Constrains entered data to positive numbers.

NumField.range(num min, num max, {bool trim = false, FormFieldValidator<String>? validator, String? blank, String? malformed, String? small, String? large, 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, List<TextInputFormatter>? inputFormatters, bool? enabled, EdgeInsets scrollPadding = const EdgeInsets.all(20.0), bool enableInteractiveSelection = true, AutovalidateMode? autovalidateMode, Key? key})

Constrains data to numbers within the range min–max.

Properties

hashCode → int

The hash code for this object.

read-only, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited

Methods

build(BuildContext context) → BasicTextField

Builds a BasicTextField suitable for numeric values.

override

createElement() → StatelessElement

Creates a StatelessElement to manage this widget's location in the tree.

inherited

debugDescribeChildren() → List<DiagnosticsNode>

Returns a list of DiagnosticsNode objects describing this node's children.

inherited

debugFillProperties(DiagnosticPropertiesBuilder properties) → void

Add additional properties associated with the node.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited

toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode

Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.

inherited

toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String

A string representation of this object.

inherited

toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String

Returns a string representation of this node and its descendants.

inherited

toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String

Returns a one-line detailed description of the object.

inherited

toStringShort() → String

A short, textual description of this widget.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited