TagInput 增加 CleanLostFocus 用于失去焦点后清空TextBox数据

demo/Ursa.Demo/Pages/TagInputDemo.axaml

@@ -21,6 +21,7 @@
         <u:TagInput
             Margin="20"
             AllowDuplicates="False"
+            CleanLostFocus="true"
             Separator="-"
             Tags="{Binding DistinctTags}" />
         <ListBox ItemsSource="{Binding DistinctTags}" />

src/Ursa/Controls/TagInput/TagInput.cs

@@ -50,6 +50,7 @@ public class TagInput : TemplatedControl
     {
         _textBox = new TextBox();
         _textBox.AddHandler(KeyDownEvent, OnTextBoxKeyDown, RoutingStrategies.Tunnel);
+        _textBox.AddHandler(LostFocusEvent, OnTextBox_LostFocus, RoutingStrategies.Bubble);
         Items = new AvaloniaList<object>
         {
             _textBox
@@ -57,6 +58,14 @@ public class TagInput : TemplatedControl
         Tags = new ObservableCollection<string>();
     }
 
+    private void OnTextBox_LostFocus(object? sender, RoutedEventArgs e)
+    {
+        if(CleanLostFocus)
+        {
+            _textBox.Text = "";
+        }
+    }
+
     public static readonly StyledProperty<ControlTheme> InputThemeProperty =
         AvaloniaProperty.Register<TagInput, ControlTheme>(
             nameof(InputTheme));
@@ -86,6 +95,16 @@ public class TagInput : TemplatedControl
         set => SetValue(SeparatorProperty, value);
     }
 
+    public static readonly StyledProperty<bool> CleanLostFocusProperty = AvaloniaProperty.Register<TagInput, bool>(
+        nameof(CleanLostFocus), defaultValue: false);
+
+    public bool CleanLostFocus
+    {
+        get => GetValue(CleanLostFocusProperty);
+        set => SetValue(CleanLostFocusProperty, value);
+    }
+
+
     public static readonly StyledProperty<bool> AllowDuplicatesProperty = AvaloniaProperty.Register<TagInput, bool>(
         nameof(AllowDuplicates), defaultValue: true);