Display Problem with RowHeader of a Scroll Pane

Question

Hi,
I am trying to display row headers for a table using another table
Here is the code
import javax.swing.*;
import javax.swing.table.*;
public class RowNumberHeader extends JTable {
  protected JTable mainTable;
  public RowNumberHeader(JTable table) {
    super();
    mainTable = table;
    setModel(new RowNumberTableModel());
    setRowSelectionAllowed(false);
    JComponent renderer = (JComponent)getDefaultRenderer(Object.class);
  public int getRowHeight(int row) {
    return mainTable.getRowHeight();
  class RowNumberTableModel extends AbstractTableModel {
    public int getRowCount() {
      return mainTable.getModel().getRowCount();
    public int getColumnCount() {
      return 1;
    public Object getValueAt(int row, int column) {
      return new Integer(row + 1);
}and then
        JTable displayTable = new JTable(...);
        scrollPane = new JScrollPane(displayTable);
        JViewport jvp = new JViewport();
        jvp.setView(new RowNumberHeader(displayTable));
        scrollPane.setRowHeader(jvp);the problem I have is that when a row is selected inside the row header, some rows go blank and you can see the selection is all screwed up. I tried setting the selection mode to ListSelectionModel.SINGLE_SELECTION but that didn't help.
A refresh of the entire screen (minimize/maximize) seems to resolve the problem. I am using jdk1.4.1 in Windows 2000.
Any ideas?
Sylvain

Answer 1

Again the problem is that when you click on the row headers, some row header rows go blank (completely white) so you can't see what they show.
ie say I have table
Row 1 - 1  2  3
Row 2 - 2  4  5
Row 3 - 5  7  7
Row 4 - 5  6  7where Row X is the row header. So for example, if you click on Row 2, you will get something like
Row 1 - 1  2  3
Row 2 - 2  4  5
      - 5  7  7
Row 4 - 5  6  7until the screen is refreshed or you click some other row header.
hmm ok, I added calling repaint on the table whenever a row is selected and at least the display problem goes away; however, the selected indexes from the event don't always match the index of the row selected. I think actually that may be the source of the display problem.
Here is the code I added in the constructor:
        getSelectionModel().addListSelectionListener(new ListSelectionListener()
            public void valueChanged(ListSelectionEvent e)
                System.out.println("Header table selection is: First = " + e.getFirstIndex() +
                                   " Last = " + e.getLastIndex());
                RowNumberHeader.this.repaint();
        });