NonZeroFormatter class

A lightweight TextInputFormatter that keeps numeric input non-zero.

It rejects a lone 0 and any redundant leading zero (00, 01, 007), so the entered number can never be zero or zero-prefixed. An optional leading minus sign is tolerated (the check runs on the digits after it).

By default allowDecimalZero permits 0. / 0.5 style values while typing, since those are non-zero decimals. Set it to false to reject every value that starts with 0.

TextField(
  keyboardType: TextInputType.number,
  inputFormatters: [
    FilteringTextInputFormatter.digitsOnly,
    NonZeroFormatter(),
  ],
);

Inheritance

• Object
• TextInputFormatter
• NonZeroFormatter

Constructors

NonZeroFormatter({bool allowDecimalZero = true})

Properties

allowDecimalZero → bool

When true, a leading 0 is allowed only when it is the start of a decimal (0. or 0.5). When false, any leading 0 is rejected.

final

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) → TextEditingValue

Called when text is being typed or cut/copy/pasted in the EditableText.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited