SignalValueListenable<T, N extends ValueListenable<T>, S extends ReadonlySignal<T>>.merge constructor

SignalValueListenable<T, N extends ValueListenable<T>, S extends ReadonlySignal<T>>.merge(
  1. N notifier,
  2. S source
)

Signal + ValueListenable

Implementation

SignalValueListenable.merge(this.notifier, super.source) {
  _SetSource? target;

  source.subscribe((val) {
    if (target == _SetSource.signal) return;
    target = _SetSource.signal;
    if (notifier is ValueNotifier<T>) {
      (notifier as ValueNotifier<T>).value = val;
    }
    target = null;
  });

  void update() {
    if (target == _SetSource.notifier) return;
    target = _SetSource.notifier;
    if (source is Signal<T>) {
      (source as Signal<T>).value = notifier.value;
    }
    target = null;
  }

  notifier.addListener(update);
  source.onDispose(() => notifier.removeListener(update));
}