[patch] 修改逻辑: 在用户误触或开了多个GUI程序的时候不能同时建立多个连接 确保一个账号只能建立一个与后端的连接

WebSocket/BackendClient.py

@@ -31,6 +31,7 @@ class BackendClient:
         self.success_callback: Optional[Callable] = None  # 新增：后端连接成功回调
         self.token_error_callback: Optional[Callable] = None  # 新增：token错误回调
         self.version_callback: Optional[Callable] = None  # 新增：版本检查回调
+        self.disconnect_callback: Optional[Callable] = None  # 新增：被踢下线回调
 
         self.is_connected = False
 
@@ -265,7 +266,8 @@ class BackendClient:
                       login: Callable = None,
                       success: Callable = None,
                       token_error: Callable = None,
-                      version: Callable = None):
+                      version: Callable = None,
+                      disconnect: Callable = None):
         """设置各种消息类型的回调函数"""
         if store_list:
             self.store_list_callback = store_list
@@ -287,6 +289,8 @@ class BackendClient:
             self.token_error_callback = token_error
         if version:
             self.version_callback = version
+        if disconnect:
+            self.disconnect_callback = disconnect
 
     def on_connected(self):
         """连接成功时的处理"""
@@ -443,6 +447,8 @@ class BackendClient:
                 self._handle_staff_list(message)
             elif msg_type == 'version_response':  # 新增：版本检查响应
                 self._handle_version_response(message)
+            elif msg_type == 'disconnect':  # 新增：被踢下线
+                self._handle_disconnect(message)
             else:
                 print(f"未知消息类型: {msg_type}")
 
@@ -1228,6 +1234,19 @@ class BackendClient:
 
         if self.version_callback:
             self.version_callback(message)
+    
+    def _handle_disconnect(self, message: Dict[str, Any]):
+        """处理被踢下线消息"""
+        disconnect_message = message.get('message', '您的账号在其他设备登录，当前连接已断开')
+        
+        print(f"[断开] 收到后端断开通知: {disconnect_message}")
+        
+        # 停止重连机制（不再尝试重连）
+        self.should_stop = True
+        
+        # 触发断开回调
+        if self.disconnect_callback:
+            self.disconnect_callback(disconnect_message)
 
     # ==================== 辅助方法 ====================