Added WinUI project.

Harmonia.WinUI/Converters/ArtistsToStringConverter.cs

@@ -0,0 +1,26 @@
+using Microsoft.UI.Xaml.Data;
+using System;
+using System.Collections.Generic;
+
+namespace Harmonia.WinUI.Converters;
+
+public partial class ArtistsToStringConverter : IValueConverter
+{
+    public ArtistsToStringConverter()
+    {
+
+    }
+
+    public object Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is not string[] artists)
+            return string.Empty;
+
+        return string.Join(" / ", artists);
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}

Harmonia.WinUI/Converters/NullVisibilityConverter.cs

@@ -0,0 +1,27 @@
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml;
+using System;
+using System.Collections;
+
+namespace Harmonia.WinUI.Converters;
+
+public sealed partial class NullVisibilityConverter : IValueConverter
+{
+    public NullVisibilityConverter()
+    {
+
+    }
+
+    public object Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is not IList list)
+            return Visibility.Collapsed;
+        
+        return list.Count == 0 ? Visibility.Collapsed : Visibility.Visible;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}

Harmonia.WinUI/Converters/RepeatStateConverter.cs

@@ -0,0 +1,26 @@
+using Harmonia.Core.Player;
+using Microsoft.UI.Xaml.Data;
+using System;
+
+namespace Harmonia.WinUI.Converters;
+
+public sealed partial class RepeatStateConverter : IValueConverter
+{
+    public RepeatStateConverter()
+    {
+
+    }
+
+    public object? Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is not RepeatState repeatState)
+            return null;
+
+        return repeatState.ToString();
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}

Harmonia.WinUI/Converters/SecondsToStringConverter.cs

@@ -0,0 +1,30 @@
+using Microsoft.UI.Xaml.Data;
+using System;
+
+namespace Harmonia.WinUI.Converters;
+
+public sealed partial class SecondsToStringConverter : IValueConverter
+{
+    public SecondsToStringConverter()
+    {
+
+    }
+
+    public object? Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is not double doubleValue)
+            return null;
+
+        TimeSpan timeSpan = TimeSpan.FromSeconds(doubleValue);
+
+        if (timeSpan.Hours >= 1)
+            return timeSpan.ToString(@"%h\:mm\:ss");
+
+        return timeSpan.ToString(@"%m\:ss");
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        return TimeSpan.Parse((string)value);
+    }
+}

Harmonia.WinUI/Converters/SongTitleConverter.cs

@@ -0,0 +1,26 @@
+using Harmonia.Core.Models;
+using Microsoft.UI.Xaml.Data;
+using System;
+
+namespace Harmonia.WinUI.Converters;
+
+public sealed partial class SongTitleConverter : IValueConverter
+{
+    public SongTitleConverter()
+    {
+
+    }
+
+    public object? Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is not Song song)
+            return null;
+
+        return string.IsNullOrWhiteSpace(song.Title) ? song.ShortFileName : song.Title;
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}

Harmonia.WinUI/Converters/VolumeStateToIconConverter.cs

@@ -0,0 +1,26 @@
+using System;
+using Microsoft.UI.Xaml.Data;
+using Harmonia.WinUI.Models;
+
+namespace Harmonia.WinUI.Converters;
+
+public sealed partial class VolumeStateConverter : IValueConverter
+{
+    public VolumeStateConverter()
+    {
+
+    }
+
+    public object? Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is not VolumeState volumeState)
+            return null;
+
+        return volumeState.ToString();
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}