ValueChangeNotifier<T> class

A value notifier class that notifies listeners of changes.

Implemented types

• ValueListenable<T>

Mixed-in types

• ChangesNotifierHelperMixin

Available extensions

• ValueChangeNotifierExtension
• ValueListenableExtension

Constructors

ValueChangeNotifier(T _value)

Constructs a ValueChangeNotifier with an initial value.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

hasListeners → bool

Whether the object has listeners.

no setter, inherited

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.

getter/setter pair, override-getter

Methods

addChangeListener(ValueChangeListener<T> listener) → void

Adds a listener to be notified of changes.

addListener(VoidCallback listener) → void

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

override

defaultAddListener(ChangeListener listener) → void

Add a listener to the list of listeners.

inherited

defaultNotifyListeners(Object? event) → void

Notify all the listeners.

inherited

defaultRemoveListener(ChangeListener listener) → void

Remove a listener from the list of listeners.

inherited

dispose() → void

Disposes the object making it unusable for further operations and releasing the resources.

inherited

map<R>(R mapper(T value)) → ValueListenable<R>

Available on ValueChangeNotifier<T>, provided by the ValueChangeNotifierExtension extension

Maps the value of the ValueChangeNotifier to a new value.

map<R>(R mapper(T value)) → ValueListenable<R>

Available on ValueListenable<T>, provided by the ValueListenableExtension extension

Returns a read-only view of the ValueListenable.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

readOnly() → ValueListenable<T>

Available on ValueChangeNotifier<T>, provided by the ValueChangeNotifierExtension extension

Returns a read-only view of the ValueChangeNotifier.

removeChangeListener(ValueChangeListener<T> listener) → void

Removes a listener from being notified of changes.

removeListener(VoidCallback listener) → void

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

override

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited