When rows in a grid with row groupings are rearranged by drag and drop, the rows become part of the destination parent or children get rearranged in case of same parent..
This is done by:
dropModel.diHelper specifies the displayed columns in the draggable helper.
dragModel.isDraggable is implemented to exclude summary rows and group titles having more than one level of children.
dropModel.isDroppable is implemented to exclude summary rows, group titles having more than one level of children, ancestor rows of dropped rows and if dragged and dropped over rows are same.
dropModel.drop moves the rows from old parent to new parent. You can override it to do custom action upon drop of rows.
First of all mutiple row selection is turned on or checkbox selection is turned on.
dragModel.dragNodes method is implemented as in this example to return array of selected or checked rows.