feat: initialize icon button.

src/Ursa/Controls/IconButton.cs

@@ -0,0 +1,35 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+
+namespace Ursa.Controls;
+
+public class IconButton: Button
+{
+    public static readonly StyledProperty<object?> IconProperty = AvaloniaProperty.Register<IconButton, object?>(
+        nameof(Icon));
+
+    public object? Icon
+    {
+        get => GetValue(IconProperty);
+        set => SetValue(IconProperty, value);
+    }
+
+    public static readonly StyledProperty<IDataTemplate?> IconTemplateProperty = AvaloniaProperty.Register<IconButton, IDataTemplate?>(
+        nameof(IconTemplate));
+
+    public IDataTemplate? IconTemplate
+    {
+        get => GetValue(IconTemplateProperty);
+        set => SetValue(IconTemplateProperty, value);
+    }
+
+    public static readonly StyledProperty<bool> IsLoadingProperty = AvaloniaProperty.Register<IconButton, bool>(
+        nameof(IsLoading));
+
+    public bool IsLoading
+    {
+        get => GetValue(IsLoadingProperty);
+        set => SetValue(IsLoadingProperty, value);
+    }
+}