JTree Expanded Icon

Question

How can I change the icon in the JTree of JavaHelps TOC when I expand or close the node. I understand that I need to give the tree a different cell renderer but can't find out where to do that. Does anyone have an example of this?
Thanks,
Rich
Developer

Answer 1

Thankyou for your help. I am getting a lot closer. There is something I am still missing though. I am sure I am setting the cell renderer to the tree now. The problem is that it is not effecting the images at all. Here is my code for this. Can you see what I am doing wrong?
private void jButtonHelp_ActionPerformed()
          try
               ClassLoader loader = this.getClass().getClassLoader();
               URL helpURL = HelpSet.findHelpSet(loader, "helpset.hs");
               m_hs = new HelpSet(loader, helpURL);
               HelpBroker hb = m_hs.createHelpBroker();
               JHelp jhelp = new JHelp(m_hs);
               JHelpTOCNavigator jhtoc = null;
               hb.setDisplayed(true);
               new CSH.DisplayHelpFromSource(hb);
               for(Enumeration enum = jhelp.getHelpNavigators();enum.hasMoreElements();)
                    try
                         jhtoc = (JHelpTOCNavigator)enum.nextElement();
                         break;
                    catch(Exception ee){}
               if(jhtoc != null)
                    JTree aTree = getNavTree(jhtoc);
                    aTree.setCellRenderer(new HelpTreeRenderer());
                    aTree.updateUI();
                    jhelp.updateUI();
          catch (Exception e)
               System.out.println("Help Exception " + e.getMessage());
class HelpTreeRenderer extends DefaultTreeCellRenderer{
     public Component getTreeCellRendererComponent(JTree tree, Object value,
          boolean selected, boolean expanded, boolean leaf, int row,
          boolean hasFocus) {
          try
               DefaultTreeCellRenderer treeCellRender = (DefaultTreeCellRenderer)
               super.getTreeCellRendererComponent(tree, value, selected, expanded,
          leaf, row, hasFocus);
               DefaultMutableTreeNode node =(DefaultMutableTreeNode)value;
               if(node.getLevel() == 1) treeCellRender.setIcon(getImageDepartment());
          catch (Exception e)
               System.out.println("HelpTreeRenderer Inner Class WIP Viewer Exception " + e.getMessage());
          return this;
}