Make a JScrollBar only update its JScrollPane when the user releases it?

Question

Hi
I have a JTable inside a JScrollpane. The JTable gets its data from my TableModel using the getValueAt method in the normal way. It is almost working fine. The one thing left to improve is that I don�t want the JTable to keep trying to get its data while the scrollbar is still being dragged. This is primarily because the latency in fetching the data makes the UI unresponsive - the table model does not keep all rows in memory at one time, but keeps a page of data in memory.
So, just to clarify, I want the behaviour to be that when the user is still adjusting the value of the scroll bar, the thumb position of the scroll bar moves, but the rows displayed in the JTable do not update. When the user releases the scrollbar, the rows should then update.
I have almost acheived this by having a second, independent scroll bar on the frame, and an adjustment listener listening for events, like this
public void adjustmentValueChanged(AdjustmentEvent e){
if (e.getSource() == scrManual){
if (!scrManual.getValueIsAdjusting()){
  JScrollBar scrTable = scrPaneResults.getVerticalScrollBar();
int iManValue = scrManual.getValue();
int iManMax = scrManual.getMaximum();
float fManWhere = (float)iManValue / (float)iManMax;
int iTblMax = scrTable.getMaximum();
int iTblNewValue = (int)(iTblMax * fManWhere);
  scrTable.setValue(iTblNewValue);
else
throw new IllegalArgumentException("I don't know how to handle the adjustment event for " + e.getSource());
}This is actually working fine, except that I don't want there to be two scrollbars - one in the scroll pane and one extra one. But when I try to make the scrollpane's scrollbar invisible, it remains visible.
Can anyone tell me either
(a) how to just have a normal JScrollPane scrollbar, but have it only update its viewport when the value is no longer adjusting (ie scrollbar has been released)
(b) how to make the JScrollPane's scrollbar still effective, but invisible.
(c) if the JScrollPane has a no scrollbars policy, how to instead in the code I posted above, set the ScrollPane's position directly.
Whichever is easiest.
Thanks for your help
Mark

Answer 1

Oh how embarassing! I already asked this question before, and answered it myself! Sorry - I think I am losing the plot
I�ve hacked it. Turns out that the jScrollPane has a getXXXScrollBar method, which even when you�ve hidden the scrollbars, still works. You just use another scroll bar, register a listener for the mouse released event, and update the jScrollPane�s scroll bar to match the value.