Increase Mousewheel Scroll Speed of my jScrollPane?

Question

Hi,
Im having some trouble increasing the mousewheel speed in my application... im using Ubuntu as operating system. Currently im doing the following:
jScrollPane.getVerticalScrollBar().setUnitIncrement(90000);I tried with 16, 30, 100, 300, and 90000 and the speed is not increasing. I also read on Ubuntu forums that mousewheel scroll speed seems to be a problem but in all other applications on my computer the speed is ok...
anyone knows how to solve this?
thanks

Answer 1

You need to override getScrollableUnitIncrement to return a larger value. SSCCE: the table on the right will scroll 5 times more than the table on the right.import java.awt.Rectangle;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
public class TwoScrollSpeeds {
   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         @Override
         public void run() {
            new TwoScrollSpeeds().makeUI();
   public void makeUI() {
      JTable tableLeft = new JTable(100, 5);
      JScrollPane scrollLeft = new JScrollPane(tableLeft);
      JTable tableRight = new JTable(100, 5) {
         @Override
         public int getScrollableUnitIncrement(Rectangle visibleRect,
               int orientation, int direction) {
            return super.getScrollableUnitIncrement(visibleRect, orientation,
                  direction) * 5;
      JScrollPane scrollRight = new JScrollPane(tableRight);
      JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
            scrollLeft, scrollRight);
      JFrame frame = new JFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(700, 500);
      frame.add(splitPane);
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
      splitPane.setDividerLocation(0.5);
}db
edit In future (not this time), Swing related questions should be posted in the [Swing forum|http://forums.sun.com/forum.jspa?forumID=57]
Edited by: Darryl.Burke