How do I display processing message in the middle of visible table area?

dimkanewtown

I think the question is self-describing, but here's a bit more detail as to what I mean.

Let's say there's a datatable containing 100 records per page, but only 20 rows are visible on the screen currently. The processing indicator should display in the middle of the visible area of the table ((headers+20rows)/2) and needs to stay visible if the user scrolls down.

Is this something that's supported out of the box?

Thanks.