fix(ui): add MessageListView.ScrollViewKeyboardDismissBehavior

packages/stream_chat_flutter/lib/scrollable_positioned_list/src/positioned_list.dart

@@ -45,6 +45,7 @@ class PositionedList extends StatefulWidget {
     this.addSemanticIndexes = true,
     this.addRepaintBoundaries = true,
     this.addAutomaticKeepAlives = true,
+    this.keyboardDismissBehavior,
   })  : assert((positionedIndex == 0) || (positionedIndex < itemCount),
             'positionedIndex cannot be 0 and must be smaller than itemCount'),
         super(key: key);
@@ -134,6 +135,10 @@ class PositionedList extends StatefulWidget {
   /// See [SliverChildBuilderDelegate.addAutomaticKeepAlives].
   final bool addAutomaticKeepAlives;
 
+  /// [ScrollViewKeyboardDismissBehavior] the defines how this [PositionedList] will
+  /// dismiss the keyboard automatically.
+  final ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior;
+
   @override
   State<StatefulWidget> createState() => _PositionedListState();
 }
@@ -173,6 +178,7 @@ class _PositionedListState extends State<PositionedList> {
           anchor: widget.alignment,
           center: _centerKey,
           controller: scrollController,
+          keyboardDismissBehavior: widget.keyboardDismissBehavior,
           scrollDirection: widget.scrollDirection,
           reverse: widget.reverse,
           cacheExtent: widget.cacheExtent,

packages/stream_chat_flutter/lib/scrollable_positioned_list/src/scroll_view.dart

@@ -28,9 +28,12 @@ class UnboundedCustomScrollView extends CustomScrollView {
     List<Widget> slivers = const <Widget>[],
     int? semanticChildCount,
     DragStartBehavior dragStartBehavior = DragStartBehavior.start,
+    ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior,
   })  : _anchor = anchor,
         super(
           key: key,
+          keyboardDismissBehavior: keyboardDismissBehavior ??
+              ScrollViewKeyboardDismissBehavior.manual,
           scrollDirection: scrollDirection,
           reverse: reverse,
           controller: controller,

packages/stream_chat_flutter/lib/scrollable_positioned_list/src/scrollable_positioned_list.dart

@@ -52,6 +52,7 @@ class ScrollablePositionedList extends StatefulWidget {
     this.addRepaintBoundaries = true,
     this.minCacheExtent,
     this.findChildIndexCallback,
+    this.keyboardDismissBehavior,
   })  : itemPositionsNotifier = itemPositionsListener as ItemPositionsNotifier?,
         separatorBuilder = null,
         super(key: key);
@@ -77,6 +78,7 @@ class ScrollablePositionedList extends StatefulWidget {
     this.addRepaintBoundaries = true,
     this.minCacheExtent,
     this.findChildIndexCallback,
+    this.keyboardDismissBehavior,
   })  : assert(separatorBuilder != null, 'seperatorBuilder cannot be null'),
         itemPositionsNotifier = itemPositionsListener as ItemPositionsNotifier?,
         super(key: key);
@@ -92,6 +94,10 @@ class ScrollablePositionedList extends StatefulWidget {
   /// index of the child element with that associated key, or null if not found.
   final ChildIndexGetter? findChildIndexCallback;
 
+  /// [ScrollViewKeyboardDismissBehavior] the defines how this [PositionedList] will
+  /// dismiss the keyboard automatically.
+  final ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior;
+
   /// Number of items the [itemBuilder] can produce.
   final int itemCount;
 
@@ -344,6 +350,7 @@ class _ScrollablePositionedListState extends State<ScrollablePositionedList>
                     child: NotificationListener<ScrollNotification>(
                       onNotification: (_) => _isTransitioning,
                       child: PositionedList(
+                        keyboardDismissBehavior: widget.keyboardDismissBehavior,
                         itemBuilder: widget.itemBuilder,
                         separatorBuilder: widget.separatorBuilder,
                         itemCount: widget.itemCount,
@@ -374,6 +381,8 @@ class _ScrollablePositionedListState extends State<ScrollablePositionedList>
                       child: NotificationListener<ScrollNotification>(
                         onNotification: (_) => false,
                         child: PositionedList(
+                          keyboardDismissBehavior:
+                              widget.keyboardDismissBehavior,
                           itemBuilder: widget.itemBuilder,
                           separatorBuilder: widget.separatorBuilder,
                           itemCount: widget.itemCount,

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -171,8 +171,13 @@ class MessageListView extends StatefulWidget {
     this.reverse = true,
     this.paginationLimit = 20,
     this.paginationLoadingIndicatorBuilder,
+    this.keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.onDrag,
   }) : super(key: key);
 
+  /// [ScrollViewKeyboardDismissBehavior] the defines how this [PositionedList] will
+  /// dismiss the keyboard automatically.
+  final ScrollViewKeyboardDismissBehavior keyboardDismissBehavior;
+
   /// Function used to build a custom message widget
   final MessageBuilder? messageBuilder;
 
@@ -443,9 +448,6 @@ class _MessageListViewState extends State<MessageListView> {
               childAnchor: Alignment.topCenter,
               message: statusString,
               child: LazyLoadScrollView(
-                onPageScrollStart: () {
-                  //FocusScope.of(context).unfocus();
-                },
                 onStartOfPage: () async {
                   _inBetweenList = false;
                   if (!_upToDate) {
@@ -471,6 +473,7 @@ class _MessageListViewState extends State<MessageListView> {
                   key: (initialIndex != 0 && initialAlignment != 0)
                       ? ValueKey('$initialIndex-$initialAlignment')
                       : null,
+                  keyboardDismissBehavior: widget.keyboardDismissBehavior,
                   itemPositionsListener: _itemPositionListener,
                   initialScrollIndex: initialIndex,
                   initialAlignment: initialAlignment,