feat: add chatTitleResolver to ChatOptions to override chatTitle behavior

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

@@ -16,6 +16,7 @@ class ChatOptions {
     this.spacing = const ChatSpacing(),
     this.messageTheme,
     this.messageThemeResolver = _defaultMessageThemeResolver,
+    this.chatTitleResolver,
     this.iconEnabledColor,
     this.iconDisabledColor,
     this.chatAlignment,
@@ -64,6 +65,10 @@ class ChatOptions {
   /// the [messageTheme] will be used.
   final MessageThemeResolver messageThemeResolver;
 
+  /// If [chatTitleResolver] is set, it will be used to get the title of
+  /// the chat in the ChatDetailScreen.
+  final ChatTitleResolver? chatTitleResolver;
+
   /// The alignment of the chatmessages in the ChatDetailScreen.
   /// Defaults to [Alignment.bottomCenter]
   final Alignment? chatAlignment;
@@ -81,6 +86,10 @@ class ChatOptions {
   final int pageSize;
 }
 
+/// Typedef for the chatTitleResolver function that is used to get a title for
+/// a chat.
+typedef ChatTitleResolver = String Function(ChatModel chat);
+
 /// 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/chat_detail_screen.dart

@@ -21,7 +21,6 @@ class ChatDetailScreen extends HookWidget {
     required this.onUploadImage,
     required this.onMessageSubmit,
     required this.onReadChat,
-    this.getChatTitle,
     super.key,
   });
 
@@ -44,9 +43,6 @@ class ChatDetailScreen extends HookWidget {
   /// Callback function triggered when the chat is read.
   final Function(ChatModel chat) onReadChat;
 
-  /// Callback function to get the chat title
-  final String Function(ChatModel chat)? getChatTitle;
-
   /// Callback for when the user wants to navigate back
   final VoidCallback? onExit;
 
@@ -74,7 +70,6 @@ class ChatDetailScreen extends HookWidget {
             _computeChatTitle(
               chatScope: chatScope,
               chat: chat,
-              getChatTitle: getChatTitle,
               onTitleComputed: (title) => chatTitle.value = title,
             ),
           );
@@ -128,11 +123,10 @@ class ChatDetailScreen extends HookWidget {
   Future<void> _computeChatTitle({
     required ChatScope chatScope,
     required ChatModel chat,
-    required String? Function(ChatModel chat)? getChatTitle,
     required void Function(String?) onTitleComputed,
   }) async {
-    if (getChatTitle != null) {
+    if (chatScope.options.chatTitleResolver != null) {
-      onTitleComputed(getChatTitle(chat));
+      onTitleComputed(chatScope.options.chatTitleResolver!.call(chat));
       return;
     }