feat: init

src/Ursa/Controls/ComboBox/MultiComboBox.cs

@@ -0,0 +1,47 @@
+using System.Collections.ObjectModel;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Controls.Templates;
+
+namespace Ursa.Controls;
+
+public class MultiComboBox: SelectingItemsControl
+{
+    private ComboBox _box;
+
+    private static ITemplate<Panel?> _defaultPanel = new FuncTemplate<Panel?>(() => new VirtualizingStackPanel());
+
+    public static readonly StyledProperty<bool> IsDropDownOpenProperty =
+        ComboBox.IsDropDownOpenProperty.AddOwner<MultiComboBox>();
+    
+    public bool IsDropDownOpen
+    {
+        get => GetValue(IsDropDownOpenProperty);
+        set => SetValue(IsDropDownOpenProperty, value);
+    }
+    
+    static MultiComboBox()
+    {
+        FocusableProperty.OverrideDefaultValue<MultiComboBox>(true);
+        ItemsPanelProperty.OverrideDefaultValue<MultiComboBox>(_defaultPanel);
+    }
+
+    protected override bool NeedsContainerOverride(object? item, int index, out object? recycleKey)
+    {
+        return NeedsContainer<MultiComboBoxItem>(item, out recycleKey);
+    }
+
+    protected override Control CreateContainerForItemOverride(object? item, int index, object? recycleKey)
+    {
+        return new MultiComboBoxItem();
+    }
+    
+    internal void ItemFocused(MultiComboBoxItem dropDownItem)
+    {
+        if (IsDropDownOpen && dropDownItem.IsFocused && dropDownItem.IsArrangeValid)
+        {
+            dropDownItem.BringIntoView();
+        }
+    }
+}