Added playlist view and initial playlist view logic.

Harmonia.UI/Caching/AudioBitmapCache.cs

@@ -0,0 +1,55 @@
+using Avalonia.Media.Imaging;
+using Harmonia.Core.Caching;
+using Harmonia.Core.Imaging;
+using Harmonia.Core.Models;
+using Microsoft.Extensions.Caching.Memory;
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Harmonia.UI.Caching;
+
+public class AudioBitmapCache(IAudioImageExtractor audioImageExtractor) : MemoryCache<Song, Bitmap>, IAudioBitmapCache
+{
+    protected override MemoryCacheOptions Options => new()
+    {
+        SizeLimit = 40,
+        CompactionPercentage = 0.2,
+    };
+
+    protected override TimeSpan SlidingExpiration => TimeSpan.FromSeconds(600);
+
+    protected override int MaxConcurrentRequests => 8;
+
+    protected override object? GetKey(Song key)
+    {
+        if (string.IsNullOrWhiteSpace(key.ImageHash) == false)
+        {
+            return key.ImageHash;
+        }
+        else if (string.IsNullOrWhiteSpace(key.ImageName) == false)
+        {
+            return key.ImageName;
+        }
+
+        return null;
+    }
+
+    protected override async ValueTask<Bitmap?> FetchAsync(Song key, CancellationToken cancellationToken)
+    {
+        SongPictureInfo? songPictureInfo = await audioImageExtractor.ExtractImageAsync(key.FileName, cancellationToken);
+
+        if (songPictureInfo == null)
+            return null;
+
+        using MemoryStream stream = new(songPictureInfo.Data);
+
+        return new Bitmap(stream);
+    }
+
+    protected override long GetEntrySize(Bitmap entry)
+    {
+        return 1;
+    }
+}