feat: add new autocomplete box.

src/Ursa/Controls/AutoCompleteBox/AutoCompleteBox.cs

@@ -0,0 +1,33 @@
+using Avalonia.Input;
+using Avalonia.Interactivity;
+
+namespace Ursa.Controls;
+
+public class AutoCompleteBox: Avalonia.Controls.AutoCompleteBox
+{
+    protected override Type StyleKeyOverride { get; } = typeof(Avalonia.Controls.AutoCompleteBox);
+
+    static AutoCompleteBox()
+    {
+        MinimumPrefixLengthProperty.OverrideDefaultValue<AutoCompleteBox>(0);
+    }
+
+    public AutoCompleteBox()
+    {
+        this.AddHandler(PointerPressedEvent, OnBoxPointerPressed, RoutingStrategies.Tunnel);
+    }
+
+    private void OnBoxPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (Equals(sender, this) && e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
+        {
+            SetCurrentValue(IsDropDownOpenProperty, true);
+        }
+    }
+
+    protected override void OnGotFocus(GotFocusEventArgs e)
+    {
+        base.OnGotFocus(e);
+        SetCurrentValue(IsDropDownOpenProperty, true);
+    }
+}