accept list controllers as params in ui package listviews

packages/stream_chat_flutter/lib/src/channel_list_view.dart

@@ -89,6 +89,7 @@ class ChannelListView extends StatefulWidget {
     this.onMoreDetailsPressed,
     this.onDeletePressed,
     this.swipeActions,
+    this.channelListController,
   }) : super(key: key);
 
   /// If true a default swipe to action behaviour will be added to this widget
@@ -187,6 +188,12 @@ class ChannelListView extends StatefulWidget {
   /// List of actions for slidable
   final List<SwipeAction>? swipeActions;
 
+  /// A [ChannelListController] allows reloading and pagination.
+  /// Use [ChannelListController.loadData] and
+  /// [ChannelListController.paginateData] respectively for reloading and
+  /// pagination.
+  final ChannelListController? channelListController;
+
   @override
   _ChannelListViewState createState() => _ChannelListViewState();
 }
@@ -194,7 +201,8 @@ class ChannelListView extends StatefulWidget {
 class _ChannelListViewState extends State<ChannelListView> {
   final _slideController = SlidableController();
 
-  final _channelListController = ChannelListController();
+  late final _channelListController =
+      widget.channelListController ?? ChannelListController();
 
   @override
   Widget build(BuildContext context) {

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -172,6 +172,7 @@ class MessageListView extends StatefulWidget {
     this.usernameBuilder,
     this.showFloatingDateDivider = true,
     this.threadSeparatorBuilder,
+    this.messageListController,
   }) : super(key: key);
 
   /// Function used to build a custom message widget
@@ -296,6 +297,10 @@ class MessageListView extends StatefulWidget {
   /// Builder used to build the thread separator in case it's a thread view
   final WidgetBuilder? threadSeparatorBuilder;
 
+  /// A [MessageListController] allows pagination.
+  /// Use [ChannelListController.paginateData] pagination.
+  final MessageListController? messageListController;
+
   @override
   _MessageListViewState createState() => _MessageListViewState();
 }
@@ -347,7 +352,8 @@ class _MessageListViewState extends State<MessageListView> {
 
   bool _inBetweenList = false;
 
-  final MessageListController _messageListController = MessageListController();
+  late final MessageListController _messageListController =
+      widget.messageListController ?? MessageListController();
 
   @override
   Widget build(BuildContext context) => MessageListCore(

packages/stream_chat_flutter/lib/src/message_search_list_view.dart

@@ -68,6 +68,7 @@ class MessageSearchListView extends StatefulWidget {
     this.errorBuilder,
     this.loadingBuilder,
     this.childBuilder,
+    this.messageSearchListController,
   }) : super(key: key);
 
   /// Message String to search on
@@ -127,13 +128,19 @@ class MessageSearchListView extends StatefulWidget {
   /// The builder that will be used in case of loading
   final WidgetBuilder? loadingBuilder;
 
+  /// A [MessageSearchListController] allows reloading and pagination.
+  /// Use [MessageSearchListController.loadData] and
+  /// [MessageSearchListController.paginateData] respectively for reloading and
+  /// pagination.
+  final MessageSearchListController? messageSearchListController;
+
   @override
   _MessageSearchListViewState createState() => _MessageSearchListViewState();
 }
 
 class _MessageSearchListViewState extends State<MessageSearchListView> {
-  final MessageSearchListController _messageSearchListController =
+  late final MessageSearchListController _messageSearchListController =
-      MessageSearchListController();
+      widget.messageSearchListController ?? MessageSearchListController();
 
   @override
   Widget build(BuildContext context) => MessageSearchListCore(

packages/stream_chat_flutter/lib/src/user_list_view.dart

@@ -64,6 +64,7 @@ class UserListView extends StatefulWidget {
     this.emptyBuilder,
     this.loadingBuilder,
     this.listBuilder,
+    this.userListController,
   })  : assert(
           crossAxisCount == 1 || groupAlphabetically == false,
           'Cannot group alphabetically when crossAxisCount > 1',
@@ -140,6 +141,11 @@ class UserListView extends StatefulWidget {
   /// The builder used when the channel list is empty.
   final WidgetBuilder? emptyBuilder;
 
+  /// A [UserListController] allows reloading and pagination.
+  /// Use [UserListController.loadData] and [UserListController.paginateData]
+  /// respectively for reloading and pagination.
+  final UserListController? userListController;
+
   @override
   _UserListViewState createState() => _UserListViewState();
 }
@@ -148,7 +154,8 @@ class _UserListViewState extends State<UserListView>
     with WidgetsBindingObserver {
   bool get _isListView => widget.crossAxisCount == 1;
 
-  final UserListController _userListController = UserListController();
+  late final UserListController _userListController =
+      widget.userListController ?? UserListController();
 
   @override
   Widget build(BuildContext context) {