JTable only renders cells visible in viewport

Question

I have a JTable which is in a JScrollPane. The JTable has multi-row spanning cells. Consider a cell 0,0 that spans 4 rows. I scroll the table so that rows 0 thru 2 are not visible. I then replace the model with a new model containing new data. The table, with it's new model, is rendered for the Viewport that is visible and the scrollpane remains scrolled where I left it. Which is what I want. But since I have multi-row spaning cells the cells outside the viewport are not considered for rendering. Since cell 0,0 spans 4 rows, cell 0.3 (which is really part of cell 0,0) does not appear rendered correctly.
How do I get all cells of the table to render (albiet I wouldn't see them unless they span into the viewport) instead of just those in the viewport.
I need something like JTable.considerViewportExtentsWhenRendering(true);

Answer 1

You will need to override the paint method of the BasicTableUI to do what you wanted. It's a bit tricky but doable.
;o)
V.V.