76 lines
2.3 KiB
C#
76 lines
2.3 KiB
C#
using System.Windows;
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using System.Windows.Media.Imaging;
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using SHH.CameraDashboard.Services; // 引用服务命名空间
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namespace SHH.CameraDashboard;
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public class VideoTileViewModel : ViewModelBase
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{
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private readonly string _boundCameraId;
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// --- 属性定义 ---
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private string _cameraName;
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public string CameraName
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{
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get => _cameraName;
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set { _cameraName = value; OnPropertyChanged(); }
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}
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private string _statusInfo;
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public string StatusInfo
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{
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get => _statusInfo;
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set { _statusInfo = value; OnPropertyChanged(); }
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}
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private BitmapImage _videoSource;
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public BitmapImage VideoSource
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{
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get => _videoSource;
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set { _videoSource = value; OnPropertyChanged(); }
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}
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// --- 构造函数 ---
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public VideoTileViewModel(string cameraId, string name)
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{
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_boundCameraId = cameraId;
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CameraName = name;
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StatusInfo = "等待信号...";
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// 【修正 1】直接订阅单例服务
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// 不需要判断 null，因为 Instance 是静态初始化的，永远存在
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StreamReceiverService.Instance.OnFrameReceived += OnGlobalFrameReceived;
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}
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// --- 事件回调 (后台线程) ---
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private void OnGlobalFrameReceived(string cameraId, byte[] jpgData)
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{
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// 1. 过滤：不是我的画面，直接忽略
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if (cameraId != _boundCameraId) return;
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// 2. 解码：耗时操作在后台完成
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var bitmap = BitmapHelper.ToBitmapImage(jpgData);
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if (bitmap == null) return;
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// 3. 【修正 2】恢复 UI 更新逻辑
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// 必须使用 Dispatcher，因为 VideoSource 绑定在界面上，只能在主线程修改
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Application.Current.Dispatcher.InvokeAsync(() =>
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{
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VideoSource = bitmap;
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// 更新状态信息 (例如显示当前时间和数据大小)
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StatusInfo = $"{DateTime.Now:HH:mm:ss} | {jpgData.Length / 1024} KB";
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});
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}
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// --- 资源清理 ---
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public void Unload()
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{
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// 【修正 3】从单例服务取消订阅
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// 这一步至关重要，否则切换页面时会内存泄漏
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StreamReceiverService.Instance.OnFrameReceived -= OnGlobalFrameReceived;
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// 清空图片引用，帮助 GC 回收内存
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VideoSource = null;
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}
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} |