title property

Implementation

@override
String get title {
  // [RxUser]s taking part in the [title] formation.
  //
  // Used to subscribe to the [RxUser.updates] to keep these [users]
  // up-to-date.
  final List<RxUser> users = [];

  switch (chat.value.kind) {
    case ChatKind.dialog:
      final RxUser? rxUser =
          members.values.firstWhereOrNull((u) => u.user.id != me)?.user;

      if (rxUser != null) {
        users.add(rxUser);
      }
      break;

    case ChatKind.group:
      if (chat.value.name == null) {
        users.addAll(members.values.take(3).map((e) => e.user));
      }
      break;

    case ChatKind.monolog:
    case ChatKind.artemisUnknown:
      // No-op.
      break;
  }

  _userSubscriptions.removeWhere((k, v) {
    if (users.none((u) => u.id == k)) {
      v.cancel();
      return true;
    }

    return false;
  });

  for (final e in users) {
    if (_userSubscriptions[e.id] == null) {
      _userSubscriptions[e.id] = e.updates.listen((_) {});
    }
  }

  return chat.value.getTitle(users, me);
}