maybeNotifyGraphChange method

void maybeNotifyGraphChange(Iterable<LxReactive> reactives)

Notifies observers of a graph change only if the dependencies have actually changed.

Implementation

void maybeNotifyGraphChange(Iterable<LxReactive> reactives) {
  if (reactives.isEmpty) return;

  int hash = 0;
  int length = 0;
  for (final r in reactives) {
    hash ^= identityHashCode(r);
    length++;
  }

  if (hash == _lastReactivesHash && length == _lastReactivesLength) {
    return;
  }

  _lastReactivesHash = hash;
  _lastReactivesLength = length;

  // Reuse list if input is already a List, otherwise cache the conversion
  if (reactives is List<LxReactive>) {
    _cachedReactivesList = reactives;
  } else {
    _cachedReactivesList = reactives.toList(growable: false);
  }

  LevitStateMiddlewareChain.applyGraphChange(this, _cachedReactivesList!);
}