Merge pull request #393 from irihitech/selectable

Introduce IsSelectable for TreeComboBoxItem.

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

@@ -217,6 +217,7 @@
         <Setter Property="Background" Value="{DynamicResource TreeViewItemDefaultBackground}" />
         <Setter Property="Foreground" Value="{DynamicResource TreeViewItemDefaultForeground}" />
         <Setter Property="CornerRadius" Value="3" />
+        <Setter Property="MinHeight" Value="32"></Setter>
         <Setter Property="VerticalAlignment" Value="Center" />
         <Setter Property="Template">
             <ControlTemplate TargetType="u:TreeComboBoxItem">

src/Ursa/Controls/ComboBox/TreeComboBox.cs

@@ -198,7 +198,7 @@ public class TreeComboBox: ItemsControl, IClearControl, IInnerContentControl, IP
             if (_popup is not null && _popup.IsOpen && _popup.IsInsidePopup(source))
             {
                 var container = GetContainerFromEventSource(source);
-                if (container is null) return;
+                if (container is null || !container.IsSelectable) return;
                 var item = TreeItemFromContainer(container);
                 if (item is null) return;
                 if (SelectedItem is not null)

src/Ursa/Controls/ComboBox/TreeComboBoxItem.cs

@@ -33,6 +33,15 @@ public class TreeComboBoxItem: HeaderedItemsControl, ISelectable
         set => SetValue(IsExpandedProperty, value);
     }
 
+    public static readonly StyledProperty<bool> IsSelectableProperty = AvaloniaProperty.Register<TreeComboBoxItem, bool>(
+        nameof(IsSelectable), true);
+
+    public bool IsSelectable
+    {
+        get => GetValue(IsSelectableProperty);
+        set => SetValue(IsSelectableProperty, value);
+    }
+
     
 
     public static readonly DirectProperty<TreeComboBoxItem, int> LevelProperty = AvaloniaProperty.RegisterDirect<TreeComboBoxItem, int>(