feat: initialize and setup demo.

src/Ursa.Themes.Semi/Controls/EnumSelector.axaml

@@ -0,0 +1,13 @@
+<ResourceDictionary
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:u="https://irihi.tech/ursa">
+    <!--  Add Resources Here  -->
+    <ControlTheme x:Key="{x:Type u:EnumSelector}" TargetType="u:EnumSelector">
+        <Setter Property="Template">
+            <ControlTemplate TargetType="u:EnumSelector">
+                <ComboBox ItemsSource="{TemplateBinding Values}" SelectedItem="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Value, Mode=TwoWay}" />
+            </ControlTemplate>
+        </Setter>
+    </ControlTheme>
+</ResourceDictionary>

src/Ursa.Themes.Semi/Controls/_index.axaml

@@ -6,6 +6,7 @@
         <ResourceInclude Source="ButtonGroup.axaml" />
         <ResourceInclude Source="Divider.axaml" />
         <ResourceInclude Source="DualBadge.axaml" />
+        <ResourceInclude Source="EnumSelector.axaml" />
         <ResourceInclude Source="IconButton.axaml" />
         <ResourceInclude Source="ImageViewer.axaml" />
         <ResourceInclude Source="IPv4Box.axaml" />

src/Ursa/Controls/EnumSelector/EnumSelector.cs

@@ -0,0 +1,67 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Data;
+
+namespace Ursa.Controls;
+
+public class EnumSelector: TemplatedControl
+{
+    public static readonly StyledProperty<Type?> EnumTypeProperty = AvaloniaProperty.Register<EnumSelector, Type?>(
+        nameof(EnumType), validate: OnTypeValidate);
+    
+    public Type? EnumType
+    {
+        get => GetValue(EnumTypeProperty);
+        set => SetValue(EnumTypeProperty, value);
+    }
+    
+    private static bool OnTypeValidate(Type? arg)
+    {
+        if (arg is null) return true;
+        return arg.IsEnum;
+    }
+
+    public static readonly StyledProperty<object?> ValueProperty = AvaloniaProperty.Register<EnumSelector, object?>(
+        nameof(Value), defaultBindingMode: BindingMode.TwoWay);
+
+    public object? Value
+    {
+        get => GetValue(ValueProperty);
+        set => SetValue(ValueProperty, value);
+    }
+    
+    public static readonly DirectProperty<EnumSelector, IList<object?>?> ValuesProperty = AvaloniaProperty.RegisterDirect<EnumSelector, IList<object?>?>(
+        nameof(Values), o => o.Values);
+    
+    private IList<object?>? _values;
+    internal IList<object?>? Values
+    {
+        get => _values;
+        private set => SetAndRaise(ValuesProperty, ref _values, value);
+    }
+    
+    
+    static EnumSelector()
+    {
+        EnumTypeProperty.Changed.AddClassHandler<EnumSelector, Type?>((o, e) => o.OnTypeChanged(e));
+    }
+
+    private void OnTypeChanged(AvaloniaPropertyChangedEventArgs<Type?> args)
+    {
+        var newType = args.GetNewValue<Type?>();
+        if (newType is null || !newType.IsEnum)
+        {
+            return;
+        }
+
+        var values = Enum.GetValues(newType);
+        List<object?> list = new();
+        foreach (var value in values)
+        {
+            if (value.GetType() == newType)
+                list.Add(value);
+        }
+        Values = list;
+    }
+}