From e829d5f1092a9c5a870eafea2a01cf603c058330 Mon Sep 17 00:00:00 2001
From: Nikita Tsukanov <keks9n@gmail.com>
Date: Mon, 20 Sep 2021 17:17:34 +0300
Subject: [PATCH] Merge pull request #6617 from SilentCoyote/DesignStyle

Add DesignStyle property
---
 src/Avalonia.Controls/Design.cs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/Avalonia.Controls/Design.cs b/src/Avalonia.Controls/Design.cs
index 0d05e19e53..07d2918a88 100644
--- a/src/Avalonia.Controls/Design.cs
+++ b/src/Avalonia.Controls/Design.cs
@@ -60,6 +60,19 @@ namespace Avalonia.Controls
             return target.GetValue(PreviewWithProperty);
         }
 
+        public static readonly AttachedProperty<IStyle> DesignStyleProperty = AvaloniaProperty
+            .RegisterAttached<Control, IStyle>("DesignStyle", typeof(Design));
+
+        public static void SetDesignStyle(Control control, IStyle value)
+        {
+            control.SetValue(DesignStyleProperty, value);
+        }
+
+        public static IStyle GetDesignStyle(Control control)
+        {
+            return control.GetValue(DesignStyleProperty);
+        }
+
         public static void ApplyDesignModeProperties(Control target, Control source)
         {
             if (source.IsSet(WidthProperty))
@@ -68,6 +81,8 @@ namespace Avalonia.Controls
                 target.Height = source.GetValue(HeightProperty);
             if (source.IsSet(DataContextProperty))
                 target.DataContext = source.GetValue(DataContextProperty);
+            if (source.IsSet(DesignStyleProperty))
+                target.Styles.Add(source.GetValue(DesignStyleProperty));
         }
     }
 }