BoxDiagrams.TextBox.DragMoveAction C# (CSharp) Метод

		public override DoOrUndo DragMoveAction(Util.WinForms.HitTestResult htr_, VectorT amount) 
		{
			var htr = htr_ as HitTestResult;
			var rf = htr == null ? RF.Move : htr.ResizeFlags;
			BoundingBox<float> old = null;
			return @do =>
			{
				if (@do) {
					old = _bbox.Clone();
					Coord x1 = _bbox.X1 + ((rf & RF.Left) != 0 ? amount.X : 0);
					Coord x2 = _bbox.X2 + ((rf & RF.Right) != 0 ? amount.X : 0);
					Coord y1 = _bbox.Y1 + ((rf & RF.Top) != 0 ? amount.Y : 0);
					Coord y2 = _bbox.Y2 + ((rf & RF.Bottom) != 0 ? amount.Y : 0);
					_bbox = new BoundingBox<float>(x1, y1, x2, y2);
					_bbox.Normalize();
				} else
					_bbox = old;
			};
		}