Rx<T> class

A single observable value — the basic building block of a state class.

Rx is a plain ValueListenable, so it works with ref.watch inside Obx, with sync/subscribe on a controller, and with any other Flutter API that accepts a Listenable.

class CounterState {
  final count = Rx<int>(0);
}

state.count.value++;                 // notifies listeners

Assigning an equal value (by ==) is a no-op and does not notify. Use update when the value is mutated in place instead of replaced.

Inheritance

• Object
• ChangeNotifier
• Rx

Implemented types

• ValueListenable<T>

Constructors

Rx(T _value)

Creates a Rx that wraps this value.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

hasListeners → bool

Whether any listeners are currently registered.

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.

getter/setter pair, override-getter

Methods

addListener(VoidCallback listener) → void

Register a closure to be called when the object changes.

inherited

dispose() → void

Discards any resources used by the object.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notifyListeners() → void

Call all the registered listeners.

inherited

removeListener(VoidCallback listener) → void

Remove a previously registered closure from the list of closures that are notified when the object changes.

inherited

toString() → String

Always throws.

override

update(void updateFn(T value)) → void

Mutates the current value in place and always notifies listeners.

Operators

operator ==(Object other) → bool

The equality operator.

inherited