functional card/row edit and drag

row.cs

@@ -98,7 +98,7 @@ public partial class row : Control
 	{
 
 	}
-    public void DropOn(Vector2 atPosition, Variant data)
+    public void DropCardOn(Vector2 atPosition, Variant data)
     {
 		GD.Print($"Dropping at {atPosition}");
 		card c = data.As<card>()
@@ -128,6 +128,23 @@ public partial class row : Control
 		{
 			throw new Exception($"Can't find card {c.CardId}");
 		}
+    }
+	public override bool _CanDropData(Vector2 atPosition, Variant data)
+    {
+        return data.As<row>() is not null;
+    }
+    public override void _DropData(Vector2 atPosition, Variant data)
+    {
+        var r = data.As<row>()
+			?? throw new Exception("Invalid drop row");
+		if (ReferenceEquals(this, r))
+				return;
+		var toIndex = GetIndex();
+		if (atPosition.Y > Size.Y / 2)
+			toIndex++;
+		if (r.GetIndex() < GetIndex())
+			toIndex--;
+		GetParent().MoveChild(r, toIndex);
     }
     public void AddCard(card card, int? toIndex = null)
 	{