优化了老师端的等待状态判断逻辑

lib/pages/teacher/room/viewmodel/tch_room_vm.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:app/request/dto/room/room_info_dto.dart';
+import 'package:app/request/dto/room/room_type_dto.dart';
 import 'package:app/request/dto/room/room_user_dto.dart';
 import 'package:app/request/dto/room/rtc_token_dto.dart';
 import 'package:app/request/websocket/room_protocol.dart';
@@ -11,7 +12,10 @@ import 'package:flutter/cupertino.dart';
 import 'type.dart';
 
 class TchRoomVM extends ChangeNotifier {
-  TchRoomVM({required this.roomInfo, String? start}) {
+  TchRoomVM({
+    required this.roomInfo,
+    String? start,
+  }) {
     _startRoom();
   }
 
@@ -20,6 +24,7 @@ class TchRoomVM extends ChangeNotifier {
 
   ///房间的基础信息
   final RoomInfoDto roomInfo;
+  int roomStatus = -1; // //-1加载中，0没开始，1进行中，2关闭
 
   ///老师选中的学生id
   int activeSId = 0;
@@ -37,7 +42,8 @@ class TchRoomVM extends ChangeNotifier {
 
   ///websocket管理
   final RoomWebSocket _ws = RoomWebSocket();
-  bool wsConnected = false; // socket连接状态
+
+  // bool wsConnected = false; // socket连接状态
   StreamSubscription<RoomMessage>? _sub;
 
   RtcTokenDto? get rtcToken => _ws.rtcToken;
@@ -50,12 +56,13 @@ class TchRoomVM extends ChangeNotifier {
     }
     //启动连接
     await _ws.connect();
-    wsConnected = true;
     //监听各种ws事件
     _sub = _ws.stream.listen((msg) {
       // 自习室人员变化
       if (msg.event == RoomEvent.changeUser) {
         final list = RoomUserDto.listFromJson(msg.data['user_list']);
+        final room = RoomTypeDto.fromJson(msg.data['room_info']);
+        roomStatus = room.roomStatus;
         onStudentChange(list);
       } else if ([
         RoomEvent.openSpeaker,