Add visual extensions

src/AtomUI.Controls.DataGrid/Utils/IndexToValueTable.cs

@@ -1,3 +1,8 @@
+// (c) Copyright Microsoft Corporation.
+// This source is subject to the Microsoft Public License (Ms-PL).
+// Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details.
+// All other rights reserved.
+
 using System.Diagnostics;
 
 namespace AtomUI.Controls.Utils;

src/AtomUI.Controls.DataGrid/Utils/VisualExtensions.cs

@@ -0,0 +1,22 @@
+using Avalonia;
+
+namespace AtomUI.Controls.Utils;
+
+public static class VisualExtensions
+{
+    internal static Point Translate(this Visual fromElement, Visual toElement, Point fromPoint)
+    {
+        if (fromElement == toElement)
+        {
+            return fromPoint;
+        }
+
+        var transform = fromElement.TransformToVisual(toElement);
+        if (transform.HasValue)
+        {
+            return fromPoint.Transform(transform.Value);
+        }
+
+        return fromPoint;
+    }
+}