Octgn.Play.Gui.CardControl.DragCollapseSelection C# (CSharp) Method

        private void DragCollapseSelection(IInputElement previous, IInputElement current)
        {
            if (current == previous) return;
            if (DraggedCards.Count <= 1) return;

            bool isFirst = true;
            // Collapse if we leave the table
            if (previous is TableControl)
            {
                foreach (CardDragAdorner overlay in OverlayElements)
                {
                    if (overlay.SourceCard == this && isFirst)
                    {
                        isFirst = false;
                        continue;
                    }
                    CardControl cardCtrl = overlay.SourceCard;
                    double dx = Card.X - cardCtrl.Card.X, dy = Card.Y - cardCtrl.Card.Y;
                    overlay.CollapseTo(dx * ScaleFactor.Width, dy * ScaleFactor.Height);
                }
            }
            // Expand if we enter the table 			
            else if (current is TableControl)
            {
                foreach (CardDragAdorner overlay in OverlayElements)
                {
                    if (overlay.SourceCard == this && isFirst)
                    {
                        isFirst = false;
                        continue;
                    }
                    overlay.Expand();
                }
            }
        }