feat: add senderTitleResolver to override the default sender.firstName for chat messages

CHANGELOG.md

@@ -19,6 +19,7 @@
 - Added imagePickerBuilder to the builders in the ChatOptions to override the image picker with a custom implementation that needs to return a Future<Uint8List?>
 - Changed the ChatBottomInputSection to be multiline and go from 45px to 120px in height depending on how many lines are in the textfield
 - Added chatScreenBuilder to the userstory configuration to customize the specific chat screen with a ChatModel as argument
+- Added senderTitleResolver to the ChatOptions to resolve the title of the sender in the chat message
 
 ## 4.0.0
 - Move to the new user story architecture

packages/flutter_chat/lib/src/config/chat_options.dart

@@ -18,6 +18,7 @@ class ChatOptions {
     this.messageTheme,
     this.messageThemeResolver = _defaultMessageThemeResolver,
     this.chatTitleResolver,
+    this.senderTitleResolver,
     this.iconEnabledColor,
     this.iconDisabledColor,
     this.chatAlignment,
@@ -72,6 +73,11 @@ class ChatOptions {
   /// the chat in the ChatDetailScreen.
   final ChatTitleResolver? chatTitleResolver;
 
+  /// If [senderTitleResolver] is set, it will be used to get the title of
+  /// the sender in a chat message. If not set, the [sender.firstName] is used.
+  /// [sender] can be null if the message is an event.
+  final SenderTitleResolver? senderTitleResolver;
+
   /// The alignment of the chatmessages in the ChatDetailScreen.
   /// Defaults to [Alignment.bottomCenter]
   final Alignment? chatAlignment;
@@ -90,6 +96,10 @@ class ChatOptions {
 /// a chat.
 typedef ChatTitleResolver = String? Function(ChatModel chat);
 
+/// Typedef for the senderTitleResolver function that is used to get a title for
+/// a sender.
+typedef SenderTitleResolver = String? Function(UserModel? user);
+
 /// Typedef for the messageThemeResolver function that is used to get a
 /// [MessageTheme] for a message. This can return null so you can fall back to
 /// default values for some messages.

packages/flutter_chat/lib/src/screens/chat_detail/widgets/default_message_builder.dart

@@ -149,8 +149,10 @@ class _ChatMessageBubble extends StatelessWidget {
       showFullDate: isNewDate || previousMessage == null,
     );
 
-    var senderTitle = Text(
-      sender?.firstName ?? "",
+    var senderTitle =
+        options.senderTitleResolver?.call(sender) ?? sender?.firstName ?? "";
+    var senderTitleText = Text(
+      senderTitle,
       style: theme.textTheme.titleMedium,
     );
 
@@ -176,7 +178,7 @@ class _ChatMessageBubble extends StatelessWidget {
         children: [
           if (messageTheme.showName! && !isSameSender) ...[
             SizedBox(height: options.spacing.chatBetweenMessagesPadding),
-            senderTitle,
+            senderTitleText,
           ],
           const SizedBox(height: 4),
           DefaultChatMessageContainer(