Controlling JScrollPane from outside

Question

I'm making an application purposed for presenting. I use two JFrames, one for controlling which only i see, and one -the view- that the audience sees.
My wish is that i can control the JScrollPane on the view-frame with a JScrollBar on the control-frame. How do i do this?
I tried:
* creating a JScrollBar on the control-frame and then define it as the scrollbar on the view-frame by a using jScrollPane1.getVerticalScrollBar();
* creating a JScrollBar on the control-frame and then define it as the scrollbar on the view-frame by a using jScrollPane1.setVerticalScrollBar(jsb);
* more...
That all didn't have any of the wished effect.
Could you help me?

Answer 1

It is an interesting problem, so I had to try it myself. It works:
import javax.swing.BoundedRangeModel;
import javax.swing.DefaultListModel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class ShareScrollBarModel
  private static final int MAX = 100;
  private JPanel mainPanel = new JPanel();
  private JScrollPane scrollpane;
  private DefaultListModel listModel;
  public ShareScrollBarModel()
    listModel = new DefaultListModel();
    for (int i = 0; i < MAX; i++)
      listModel.addElement(new Integer(i));
    JList list = new JList(listModel);
    scrollpane = new JScrollPane(list);
    scrollpane.getVerticalScrollBar().setEnabled(false);
    mainPanel.add(scrollpane);
  public JPanel getMainPanel()
    return mainPanel;
  public BoundedRangeModel getVertScrollBarModel()
    return scrollpane.getVerticalScrollBar().getModel();
  public DefaultListModel getListModel()
    return listModel;
import java.awt.Dimension;
import javax.swing.BoundedRangeModel;
import javax.swing.DefaultListModel;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
public class ShareScrollBarModelTest
  private JPanel mainPanel = new JPanel();
  private JScrollPane scrollpane;
  private DefaultListModel listModel;
  public ShareScrollBarModelTest(BoundedRangeModel vertSBarModel, DefaultListModel listMod)
    JList list = new JList(listMod);
    JScrollBar vertBar = new JScrollBar();
    vertBar.setModel(vertSBarModel);
    scrollpane = new JScrollPane(list);
    scrollpane.setVerticalScrollBar(vertBar);
    mainPanel.setPreferredSize(new Dimension(400, 300));
    mainPanel.add(scrollpane);
  public JPanel getMainPanel()
    return mainPanel;
  public JScrollPane getScrollPane()
    return scrollpane;
  public DefaultListModel getListModel()
    return listModel;
  private static void createAndShowUI()
    ShareScrollBarModel ssbModel = new ShareScrollBarModel();
    ShareScrollBarModelTest modelTest = new ShareScrollBarModelTest(ssbModel.getVertScrollBarModel(), ssbModel.getListModel());
    JFrame frame = new JFrame("Frame Display");
    JDialog dialog = new JDialog(frame, "Dialog Display", false);
    dialog.getContentPane().add(ssbModel.getMainPanel());
    dialog.pack();
    dialog.setLocationRelativeTo(null);
    frame.getContentPane().add(modelTest.getMainPanel());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    dialog.setVisible(true);
  public static void main(String[] args)
    java.awt.EventQueue.invokeLater(new Runnable()
      public void run()
        createAndShowUI();
}