初始化

lib/widgets/room/video_surface.dart

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+import 'package:flutter/material.dart';
+
+/// 视频画面显示状态
+enum VideoState {
+  /// 正常显示视频
+  normal,
+
+  /// 摄像头关闭
+  closed,
+
+  /// 掉线 / 未连接
+  offline,
+
+  /// 加载中（进房、拉流等）
+  loading,
+
+  /// 错误状态（拉流失败等）
+  error,
+}
+
+class VideoSurface extends StatelessWidget {
+  final VideoState state;
+
+  const VideoSurface({super.key, this.state = VideoState.normal});
+
+  @override
+  Widget build(BuildContext context) {
+    String stateText = switch (state) {
+      VideoState.closed => "摄像头已关闭",
+      VideoState.offline => "掉线",
+      VideoState.loading => "加载中",
+      VideoState.error => "错误",
+      _ => "未知",
+    };
+    //如果不是正常
+    if (state != VideoState.normal) {
+      return Align(
+        child: Text(stateText, style: TextStyle(color: Colors.white70)),
+      );
+    }
+    return Container();
+  }
+}