From 218ec6bfdbc782a1841590deddc8cb49fdf15fb5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Wies=C5=82aw=20S=CC=8Colte=CC=81s?=
 <wieslaw.soltes@gmail.com>
Date: Wed, 24 Apr 2024 12:43:47 +0200
Subject: [PATCH] Add ExecuteCommandOnLostFocusBehavior

---
 .../ExecuteCommandOnLostFocusBehavior.cs      | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/Avalonia.Xaml.Interactions.Custom/ExecuteCommandOnLostFocusBehavior.cs

diff --git a/src/Avalonia.Xaml.Interactions.Custom/ExecuteCommandOnLostFocusBehavior.cs b/src/Avalonia.Xaml.Interactions.Custom/ExecuteCommandOnLostFocusBehavior.cs
new file mode 100644
index 00000000..439d21de
--- /dev/null
+++ b/src/Avalonia.Xaml.Interactions.Custom/ExecuteCommandOnLostFocusBehavior.cs
@@ -0,0 +1,42 @@
+using System.Reactive.Disposables;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+
+namespace Avalonia.Xaml.Interactions.Custom;
+
+/// <summary>
+/// 
+/// </summary>
+public class ExecuteCommandOnLostFocusBehavior : ExecuteCommandBehaviorBase
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="disposable"></param>
+    protected override void OnAttachedToVisualTree(CompositeDisposable disposable)
+    {
+        var dispose = AssociatedObject?
+            .AddDisposableHandler(
+                InputElement.LostFocusEvent,
+                AssociatedObject_LostFocus,
+                RoutingStrategies.Tunnel | RoutingStrategies.Bubble);
+
+        if (dispose is not null)
+        {
+            disposable.Add(dispose);
+        }
+    }
+
+    private void AssociatedObject_LostFocus(object? sender, RoutedEventArgs e)
+    {
+        if (e.Handled)
+        {
+            return;
+        }
+
+        if (ExecuteCommand())
+        {
+            e.Handled = true;
+        }
+    }
+}