onUserPresenceChanged method

void onUserPresenceChanged(Event event, StreamChannelListController controller)

Function which gets called for the event 'user.presence.changed' and EventType.userUpdated.

This event is fired when a user's presence changes or gets updated.

By default, this updates the channel member with the event user.

Implementation

void onUserPresenceChanged(
  Event event,
  StreamChannelListController controller,
) {
  final user = event.user;
  if (user == null) return;

  final channels = [...controller.currentItems];

  final updatedChannels = channels.map((channel) {
    final members = [...channel.state!.members];
    final memberIndex = members.indexWhere(
      (it) => user.id == (it.userId ?? it.user?.id),
    );

    if (memberIndex < 0) return channel;

    members[memberIndex] = members[memberIndex].copyWith(user: user);
    final updatedState = ChannelState(members: [...members]);
    channel.state!.updateChannelState(updatedState);

    return channel;
  });

  controller.channels = [...updatedChannels];
}