initial commit

Avalonia.PropertyGrid/Converters/NegateBoolConverter.cs

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+using System;
+using System.Globalization;
+using Avalonia.Data.Converters;
+
+namespace Avalonia.PropertyGrid.Controls;
+
+/// <summary>
+/// Converts boolean value to its negation for two-way binding
+/// </summary>
+public class NegateBoolConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is bool boolValue)
+        {
+            return !boolValue;
+        }
+        return false;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is bool boolValue)
+        {
+            return !boolValue;
+        }
+        return false;
+    }
+}