feat: initial DualBadge.

src/Ursa/Controls/DualBadge.cs

@@ -0,0 +1,53 @@
+using Avalonia;
+using Avalonia.Controls.Metadata;
+using Avalonia.Controls.Presenters;
+using Avalonia.Controls.Primitives;
+using Avalonia.Controls.Templates;
+using Avalonia.Media;
+
+namespace Ursa.Controls;
+
+[TemplatePart(PART_Icon, typeof(ContentPresenter))]
+public class DualBadge : HeaderedContentControl
+{
+    public const string PART_HeaderPresenter = "PART_HeaderPresenter";
+    public const string PART_ContentPresenter = "PART_ContentPresenter";
+    public const string PART_Icon = "PART_Icon";
+
+    public static readonly StyledProperty<object?> IconProperty =
+        AvaloniaProperty.Register<DualBadge, object?>(nameof(Icon));
+
+    public object? Icon
+    {
+        get => GetValue(IconProperty);
+        set => SetValue(IconProperty, value);
+    }
+
+    public static readonly StyledProperty<IDataTemplate?> IconTemplateProperty =
+        AvaloniaProperty.Register<DualBadge, IDataTemplate?>(nameof(IconTemplate));
+
+    public IDataTemplate? IconTemplate
+    {
+        get => GetValue(IconTemplateProperty);
+        set => SetValue(IconTemplateProperty, value);
+    }
+
+
+    public static readonly StyledProperty<IBrush?> HeaderForegroundProperty =
+        AvaloniaProperty.Register<DualBadge, IBrush?>(nameof(HeaderForeground));
+
+    public IBrush? HeaderForeground
+    {
+        get => GetValue(HeaderForegroundProperty);
+        set => SetValue(HeaderForegroundProperty, value);
+    }
+
+    public static readonly StyledProperty<IBrush?> HeaderBackgroundProperty =
+        AvaloniaProperty.Register<DualBadge, IBrush?>(nameof(HeaderBackground));
+
+    public IBrush? HeaderBackground
+    {
+        get => GetValue(HeaderBackgroundProperty);
+        set => SetValue(HeaderBackgroundProperty, value);
+    }
+}