useSet<E> function

SetAction<E> useSet<E>(Set<E> initialSet)

Flutter state hook that tracks a Set.

Implementation

SetAction<E> useSet<E>(Set<E> initialSet) {
  final set = useState(initialSet);

  final value = useCallback<Set<E> Function()>(() {
    return set.value;
  }, const []);

  final add = useCallback<void Function(E element)>((element) {
    set.value = {
      ...set.value,
      ...{element}
    };
  }, const []);

  final addAll = useCallback<void Function(Set<E>)>((value) {
    set.value = {...set.value, ...value};
  }, const []);

  final replace = useCallback<void Function(Set<E>)>((newMap) {
    set.value = newMap;
  }, const []);

  final remove = useCallback<void Function(E element)>((element) {
    final removedSet = {...set.value};
    removedSet.remove(element);
    set.value = removedSet;
  }, const []);

  final reset = useCallback<VoidCallback>(() {
    set.value = initialSet;
  }, const []);

  final toggle = useCallback<void Function(E element)>((element) {
    final toggleSet = {...set.value};
    toggleSet.contains(element)
        ? toggleSet.remove(element)
        : toggleSet.add(element);
    set.value = toggleSet;
  }, const []);

  final state =
      useRef(SetAction<E>(value, add, addAll, replace, toggle, remove, reset));
  return state.value;
}