Add Windows desktop version

windows/StreamPlayer.Desktop/Converters/InverseBooleanConverter.cs

@@ -0,0 +1,27 @@
+using System;
+using Avalonia.Data.Converters;
+
+namespace StreamPlayer.Desktop.Converters;
+
+public sealed class InverseBooleanConverter : IValueConverter
+{
+    public static readonly InverseBooleanConverter Instance = new();
+
+    public object? Convert(object? value, Type targetType, object? parameter, System.Globalization.CultureInfo culture)
+    {
+        if (value is bool boolean)
+        {
+            return !boolean;
+        }
+        return Avalonia.AvaloniaProperty.UnsetValue;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, System.Globalization.CultureInfo culture)
+    {
+        if (value is bool boolean)
+        {
+            return !boolean;
+        }
+        return Avalonia.AvaloniaProperty.UnsetValue;
+    }
+}