Alsing.Windows.Forms.SyntaxBox.EditViewControl.OnDragOver C# (CSharp) Method

        protected override void OnDragOver(DragEventArgs
                                               drgevent)
        {
            if (!ReadOnly)
            {
                if (Document != null)
                {
                    View.Action = EditAction.DragText;

                    Point pt = PointToClient(new Point(drgevent.X, drgevent.Y));

                    int x = pt.X;
                    int y = pt.Y;

                    //	drgevent.Effect = DragDropEffects.All  ;
                    //Caret.Position = Painter.CharFromPixel(x,y);

                    drgevent.Effect = (drgevent.KeyState & 8) == 8 ? DragDropEffects.Copy : DragDropEffects.Move;
                    Caret.SetPos(Painter.CharFromPixel(x, y));
                    Redraw();
                }
            }
            else
            {
                drgevent.Effect = DragDropEffects.None;
            }
        }