Add EnumAttributeConverters

StabilityMatrix.Avalonia/Converters/EnumAttributeConverter.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Reflection;
+using Avalonia.Data.Converters;
+
+namespace StabilityMatrix.Avalonia.Converters;
+
+/// <summary>
+/// Converts an enum value to an attribute
+/// </summary>
+/// <typeparam name="TAttribute">Type of attribute</typeparam>
+public class EnumAttributeConverter<TAttribute>(Func<TAttribute, object?>? accessor = null) : IValueConverter
+    where TAttribute : Attribute
+{
+    /// <inheritdoc />
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is null)
+            return null;
+
+        if (value is not Enum @enum)
+            throw new ArgumentException("Value must be an enum");
+
+        var field = @enum.GetType().GetField(@enum.ToString());
+        if (field is null)
+            throw new ArgumentException("Value must be an enum");
+
+        if (field.GetCustomAttributes<TAttribute>().FirstOrDefault() is not { } attribute)
+            throw new ArgumentException($"Enum value {@enum} does not have attribute {typeof(TAttribute)}");
+
+        return accessor is not null ? accessor(attribute) : attribute;
+    }
+
+    /// <inheritdoc />
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotSupportedException();
+    }
+}

StabilityMatrix.Avalonia/Converters/EnumAttributeConverters.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace StabilityMatrix.Avalonia.Converters;
+
+internal static class EnumAttributeConverters
+{
+    public static EnumAttributeConverter<DisplayAttribute> Display => new();
+
+    public static EnumAttributeConverter<DisplayAttribute> DisplayName => new(attribute => attribute.Name);
+
+    public static EnumAttributeConverter<DisplayAttribute> DisplayDescription =>
+        new(attribute => attribute.Description);
+}