Various updates.

Harmonia.WinUI/ViewModels/PlayerViewModel.cs

@@ -12,6 +12,8 @@ using System.ComponentModel;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Input;
+using Windows.System;
+using DispatcherQueue = Microsoft.UI.Dispatching.DispatcherQueue;
 
 namespace Harmonia.WinUI.ViewModels;
 
@@ -20,6 +22,7 @@ public partial class PlayerViewModel : ViewModelBase
     private readonly IAudioPlayer _audioPlayer;
     private readonly IAudioBitmapImageCache _audioBitmapImageCache;
     private readonly DispatcherTimer _timer;
+    private readonly DispatcherQueue _dispatcherQueue;
 
     private CancellationTokenSource? _songImageCancellationTokenSource;
 
@@ -185,6 +188,18 @@ public partial class PlayerViewModel : ViewModelBase
         }
     }
 
+    public bool CanUpdatePosition
+    {
+        get
+        {
+            return _audioPlayer.State != AudioPlaybackState.Stopped;
+        }
+        private set
+        {
+            OnPropertyChanged();
+        }
+    }
+
     public ICommand PlaySongCommand => new RelayCommand(Play);
     public ICommand PauseSongCommand => new RelayCommand(Pause);
     public ICommand StopSongCommand => new RelayCommand(Stop);
@@ -208,6 +223,8 @@ public partial class PlayerViewModel : ViewModelBase
         };
 
         _timer.Tick += TickTock;
+
+        _dispatcherQueue = DispatcherQueue.GetForCurrentThread();
     }
 
     #region Event Handlers
@@ -230,9 +247,13 @@ public partial class PlayerViewModel : ViewModelBase
         _songImageCancellationTokenSource = new();
         CancellationToken cancellationToken = _songImageCancellationTokenSource.Token;
 
-        BitmapImage? bitmapImage = await _audioBitmapImageCache.GetAsync(Song, cancellationToken);
+        //BitmapImage? bitmapImage = await _audioBitmapImageCache.GetAsync(Song, cancellationToken);
 
-        DispatcherQueue.GetForCurrentThread().TryEnqueue(() => SongImageSource = bitmapImage);
+        _dispatcherQueue.TryEnqueue(async () =>
+        {
+            BitmapImage? bitmapImage = await _audioBitmapImageCache.GetAsync(Song, cancellationToken);
+            SongImageSource = bitmapImage;
+        });
     }
 
     private void OnAudioPlayerPropertyChanged(object? sender, PropertyChangedEventArgs e)
@@ -241,6 +262,7 @@ public partial class PlayerViewModel : ViewModelBase
         {
             case nameof(_audioPlayer.State):
                 UpdateTimer();
+                OnPropertyChanged(nameof(CanUpdatePosition));
                 break;
         }
     }