Added playlist view and initial playlist view logic.

Harmonia.UI/Views/PlaylistView.axaml.cs

@@ -0,0 +1,91 @@
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Avalonia.Media.Imaging;
+using Avalonia.Threading;
+using Harmonia.Core.Caching;
+using Harmonia.Core.Imaging;
+using Harmonia.Core.Playlists;
+using Harmonia.UI.ViewModels;
+using Microsoft.Extensions.Caching.Memory;
+using System;
+using System.Collections.Concurrent;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Harmonia.UI.Views;
+
+public partial class PlaylistView : UserControl
+{
+    private readonly PlaylistViewModel _viewModel;
+    private readonly ConcurrentDictionary<int, CancellationTokenSource> _imageCancellationTokens = [];
+
+    public PlaylistView()
+    {
+        InitializeComponent();
+        _viewModel = (PlaylistViewModel)DataContext!;
+    }
+
+    private void ListBox_DoubleTapped(object? sender, TappedEventArgs e)
+    {
+        if (sender is ListBox listBox && listBox.SelectedItem is PlaylistSong playlistSong)
+        {
+            _viewModel.PlaySong(playlistSong);
+        }
+    }
+
+    private void Image_Loaded(object? sender, RoutedEventArgs e)
+    {
+        if (sender is not Image image)
+            return;
+
+        if (image.DataContext is not PlaylistSong playlistSong)
+            return;
+
+        Task.Run(() => DoSomethingAsync(image, playlistSong));
+    }
+
+    private async Task DoSomethingAsync(Image image, PlaylistSong playlistSong)
+    {
+        int hashCode = image.GetHashCode();
+
+        _imageCancellationTokens.TryGetValue(hashCode, out CancellationTokenSource? cancellationTokenSource);
+        cancellationTokenSource?.Cancel();
+
+        cancellationTokenSource = new();
+
+        Bitmap? bitmap = await _viewModel.GetBitmapAsync(playlistSong, cancellationTokenSource.Token);
+
+        if (bitmap == null)
+            return;
+
+        await Dispatcher.UIThread.InvokeAsync(() => SetSongImageSource(image, bitmap));
+    }
+
+    private static void SetSongImageSource(Image image, Bitmap bitmap)
+    {
+        image.Source = bitmap;
+    }
+
+    private void Image_Unloaded(object? sender, RoutedEventArgs e)
+    {
+        if (sender is not Image image)
+            return;
+
+        if (image.DataContext is not PlaylistSong playlistSong)
+            return;
+
+        if (image.Source is Bitmap bitmap)
+        {
+            bitmap.Dispose();
+        }
+
+        image.Source = null;
+
+        int hashCode = image.GetHashCode();
+
+        _imageCancellationTokens.TryGetValue(hashCode, out CancellationTokenSource? cancellationTokenSource);
+        cancellationTokenSource?.Cancel();
+    }
+}