JTree + JList in JScrollPane - Out of Sync

[Kelly Dolan]

I'm building a UI that looks somewhat like a gantt chart.

How I achieved this look was to have a JScrollPane in my main window frame. I set the viewport view to be a JList and the row header view to be a JTree. I have successfully managed to coordinate the expanding/collapsing of JTree nodes with the showing/hiding of JList items.

I have two problems. Assume both the JTree and JList require more display space than the scroll pane provides and therefore there is a scroll bar.

(1) When I scroll using the scroll bar, my JList repaints itself correctly but my JTree does not. For example, if I scroll down the list, each item moves up but the last item displayed mimics one before it. Obviously, the default scroll pane support is not enough.

- Can my JTree be a listener to something? What might that be?

(2) When I expand/collapse a tree node, sometimes it repositions the JTree in the row header panel. This is a problem because now my rows are out of sync.

- Is there a way I can disable the JTree from doing this?
- If not, is there a way I can figure out how much it scrolled and then scroll it back? I'm afraid if I were to notify the scroll pane and ask it to scroll that much, it would only scroll the JTree again.

Any and all help is greatly appreciated!

[Kelly Dolan]

Answer to (2):

setScrollsOnExpand(false);