Merge pull request #70 from GetStream/feature/lockChannelsOrder

add lockChannelsOrder property to channelsBloc

lib/src/channels_bloc.dart

@@ -11,10 +11,14 @@ class ChannelsBloc extends StatefulWidget {
   /// The widget child
   final Widget child;
 
+  /// Set this to false to prevent channels to be brought to the top of the list when a new message arrives
+  final bool lockChannelsOrder;
+
   /// Instantiate a new ChannelsBloc
   const ChannelsBloc({
     Key key,
     this.child,
+    this.lockChannelsOrder = false,
   }) : super(key: key);
 
   @override
@@ -59,7 +63,7 @@ class ChannelsBlocState extends State<ChannelsBloc>
   Stream<bool> get queryChannelsLoading =>
       _queryChannelsLoadingController.stream;
 
-  List<Channel> _hiddenChannels = [];
+  final List<Channel> _hiddenChannels = [];
 
   /// Calls [client.queryChannels] updating [queryChannelsLoading] stream
   Future<void> queryChannels({
@@ -115,6 +119,7 @@ class ChannelsBlocState extends State<ChannelsBloc>
 
     final client = StreamChat.of(context).client;
 
+    if (!widget.lockChannelsOrder) {
       _subscriptions.add(client.on(EventType.messageNew).listen((e) {
         final newChannels = List<Channel>.from(channels ?? []);
         final index = newChannels.indexWhere((c) => c.cid == e.cid);
@@ -131,6 +136,7 @@ class ChannelsBlocState extends State<ChannelsBloc>
           }
         }
       }));
+    }
 
     _subscriptions.add(client.on(EventType.channelHidden).listen((event) async {
       final newChannels = List<Channel>.from(channels);