EmptyValueListenable<T> class abstract

Inheritance

• Object
• Listenable
• ValueListenable<T>
• AdvancedValueListenable<T>
• EmptyValueListenable

Implementers

• EmptyValueNotifier

Constructors

EmptyValueListenable()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

isEmpty → bool

true if the value does not contain a valid value, because it has been initialized by the EmptyValueNotifier.empty constructor.

no setter

isNotEmpty → bool

false if the value does not contain a valid value, because it has been initialized by the EmptyValueNotifier.empty constructor.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

value → T

The current value of the object. When the value changes, the callbacks registered with addListener will be invoked.

no setter, inherited

Methods

addListener(VoidCallback listener) → void

Register a closure to be called when the object notifies its listeners.

inherited

addValueListener(ValueCallback<T> listener) → void

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

removeListener(VoidCallback listener) → void

Remove a previously registered closure from the list of closures that the object notifies.

inherited

removeValueListener(ValueCallback<T> listener) → void

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited