NotValidator<T> class

A validator that negates the result of another validator.

NotValidator inverts the validation logic - it passes when the wrapped validator fails and fails when the wrapped validator passes. Useful for creating exclusion rules.

Example:

NotValidator(
  EmailValidator(),
  message: 'Must not be an email address',
)
Inheritance

Constructors

NotValidator(Validator<T> validator, {String? message})
Creates a NotValidator that negates the result of another validator.
const

Properties

hashCode → int
The hash code for this object.
no setteroverride
message → String?
Custom error message, or null to use default localized message.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
validator → Validator<T>
The validator whose result will be negated.
final

Methods

combine(Validator<T> other) → Validator<T>
Combines this validator with another validator using AND logic.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
shouldRevalidate(FormKey source) → bool
Determines if this validator should be re-run when the specified form key changes.
inherited
toString() → String
A string representation of this object.
inherited
validate(BuildContext context, T? value, FormValidationMode state) → FutureOr<ValidationResult?>
Validates the given value and returns a validation result.
override

Operators

operator &(Validator<T> other) → Validator<T>
Combines this validator with another using AND logic (alias for combine).
inherited
operator +(Validator<T> other) → Validator<T>
Combines this validator with another using AND logic (alias for combine).
inherited
operator ==(Object other) → bool
The equality operator.
override
operator unary-() → Validator<T>
Negates this validator's result (alias for ~ operator).
inherited
operator |(Validator<T> other) → Validator<T>
Combines this validator with another using OR logic.
inherited
operator ~() → Validator<T>
Negates this validator's result.
inherited