增加打字机效果

lib/home_page.dart

@@ -154,10 +154,15 @@ class _HomePageState extends State<HomePage> {
     try {
       String fullResponse = '';
       bool isFirstChunk = true;
+      // 创建一个缓冲区来存储收到的文本
+      StringBuffer buffer = StringBuffer();
       await for (final chunk in openAIService.chatGPTAPI(userMessage)) {
+        buffer.write(chunk);
+        // 逐字显示文本
+        for (int i = fullResponse.length; i < buffer.length; i++) {
           setState(() {
-          fullResponse += chunk;
-          if (isFirstChunk) {
+            fullResponse += buffer.toString()[i];
+            if (isFirstChunk && i == 0) {
               messages.add(ChatMessage(
                 text: fullResponse,
                 isUserMessage: false,
@@ -170,6 +175,10 @@ class _HomePageState extends State<HomePage> {
               );
             }
           });
+
+          // 添加短暂延迟以创建打字效果
+          await Future.delayed(const Duration(milliseconds: 50));
+        }
       }
       await systemSpeak(fullResponse);
       await _updateCurrentConversation();
@@ -191,10 +200,16 @@ class _HomePageState extends State<HomePage> {
     try {
       String fullResponse = '';
       bool isFirstChunk = true;
+      // 创建一个缓冲区来存储收到的文本
+      StringBuffer buffer = StringBuffer();
       await for (final chunk in openAIService.chatGPTAPI(userInput)) {
+        buffer.write(chunk);
+
+        // 逐字显示文本
+        for (int i = fullResponse.length; i < buffer.length; i++) {
           setState(() {
-          fullResponse += chunk;
-          if (isFirstChunk) {
+            fullResponse += buffer.toString()[i];
+            if (isFirstChunk && i == 0) {
               messages.add(ChatMessage(
                 text: fullResponse,
                 isUserMessage: false,
@@ -207,6 +222,10 @@ class _HomePageState extends State<HomePage> {
               );
             }
           });
+
+          // 添加短暂延迟以创建打字效果
+          await Future.delayed(const Duration(milliseconds: 50));
+        }
       }
       await systemSpeak(fullResponse);
       await _updateCurrentConversation();