SignalsMixin

SignalsMixin is a mixin for State that auto disposes signals when the widget is removed from the widget tree.

Note

The mixin requires a StatefulWidget for the widget lifecycle methods.

Signals

Signal, computed, value signals, and async signals can be created with helper methods prefixed with create*.

class _MyState extends State<MyWidget> with SignalsMixin {
  late final count = createSignal(0);
  late final isEven = createComputed(() => signal.value.isEven);
  late final list = createListSignal(0);
}

Effects

Effects can be created with the createEffect method. They will get disposed when the widget is removed from the widget tree.

Danger

Effect can not be created as late field variables because they will never be evaluated.

Example that does not work:

class _MyState extends State<MyWidget> with SignalsMixin {
  late final effect = createEffect(() => print('Effect created'));
}

class _MyState extends State<MyWidget> with SignalsMixin {
  @override
  void initState() {
    super.initState();
    createEffect(() => print('Effect created'));
  }
}