useWidgetEffect function

Effect useWidgetEffect(BuildContext context)

Use a ReactiveEffect to create a widget effect for a given BuildContext.

Stop widget reactive effect.

final effect = useWidgetEffect(context);
effect.stop();

After stopping, the Widget will stop collecting signals and responding.

Implementation

Effect useWidgetEffect(BuildContext context) {
  final cached = _store[context];
  if (cached != null) return cached;

  assert(context is Element, 'oref: The `context` must be an Element');
  final element = context as Element,
      scope = useWidgetScope(element),
      prevSub = alien.setActiveSub(scope as alien.ReactiveNode);
  try {
    final e = effect(null, () {
      resetMemoizedCursor(element);
      if (!element.mounted) {
        scope();
      } else if (!element.dirty) {
        element.markNeedsBuild();
      }
    }, detach: false);
    _store[element] = e;

    return e;
  } finally {
    alien.setActiveSub(prevSub);
  }
}