migrate ui

packages/stream_chat_flutter/lib/src/channel_name.dart

@@ -10,12 +10,12 @@ import '../stream_chat_flutter.dart';
 class ChannelName extends StatelessWidget {
   /// Instantiate a new ChannelName
   const ChannelName({
-    Key key,
+    Key? key,
     this.textStyle,
   }) : super(key: key);
 
   /// The style of the text displayed
-  final TextStyle textStyle;
+  final TextStyle? textStyle;
 
   @override
   Widget build(BuildContext context) {
@@ -26,31 +26,31 @@ class ChannelName extends StatelessWidget {
       stream: channel.extraDataStream,
       initialData: channel.extraData,
       builder: (context, snapshot) {
-        return _buildName(snapshot.data, channel.state.members, client);
+        return _buildName(snapshot.data!, channel.state?.members, client);
       },
     );
   }
 
   Widget _buildName(
     Map<String, dynamic> extraData,
-    List<Member> members,
+    List<Member>? members,
     StreamChatState client,
   ) {
     return LayoutBuilder(
       builder: (context, constraints) {
-        String title;
+        String? title;
         if (extraData['name'] == null) {
           final otherMembers =
-              members.where((member) => member.userId != client.user.id);
-          if (otherMembers.length == 1) {
-            title = otherMembers.first.user.name;
-          } else if (otherMembers.isNotEmpty) {
+              members?.where((member) => member.userId != client.user!.id);
+          if (otherMembers?.length == 1) {
+            title = otherMembers!.first.user?.name;
+          } else if (otherMembers?.isNotEmpty == true) {
             final maxWidth = constraints.maxWidth;
-            final maxChars = maxWidth / textStyle.fontSize;
+            final maxChars = maxWidth / (textStyle?.fontSize ?? 1);
             var currentChars = 0;
             final currentMembers = <Member>[];
-            otherMembers.forEach((element) {
-              final newLength = currentChars + element.user.name.length;
+            otherMembers!.forEach((element) {
+              final newLength = currentChars + (element.user?.name.length ?? 0);
               if (newLength < maxChars) {
                 currentChars = newLength;
                 currentMembers.add(element);
@@ -60,7 +60,7 @@ class ChannelName extends StatelessWidget {
             final exceedingMembers =
                 otherMembers.length - currentMembers.length;
             title =
-                '${currentMembers.map((e) => e.user.name).join(', ')} ${exceedingMembers > 0 ? '+ $exceedingMembers' : ''}';
+                '${currentMembers.map((e) => e.user?.name).join(', ')} ${exceedingMembers > 0 ? '+ $exceedingMembers' : ''}';
           } else {
             title = 'No title';
           }
@@ -69,7 +69,7 @@ class ChannelName extends StatelessWidget {
         }
 
         return Text(
-          title,
+          title!,
           style: textStyle,
           overflow: TextOverflow.ellipsis,
         );