onDragDrop method
Implementation
Future<bool> onDragDrop(int dragIndex, int dropIndex) async {
var draggable = getRowModel(dragIndex);
var droppable = getRowModel(dropIndex);
if (draggable != null && droppable != null) {
// fire onDrop event
await DragDrop.onDrop(droppable, draggable);
// move the row
moveRow(dragIndex, dropIndex);
}
return true;
}