How to refresh my tree when the model changes.

[Richard Johnson]

Hi,
I have written my own custom tree model. I create the JTree and pass the model as parameter then show the JTree in a scrollpane.
There is a button to repopulate the tree model. My question is when I hit this the model is repopulated, but the UI does not reflect the changes even after calling revalidate.
What is the best way to detect the changes and update the JTree/UI properly when the whole tree model (except the root node) is regenerated? Should I be firing some sort of event from the tree model after it's regenerated or something?
Thanks for the assistance.
Rich.

[Andy Nimmo]

Richard,
At what point in your code are you calling the validate( ) method? Also, which components validate( ) method are you calling?
Maybe post a little code in a reply so we can see what you're doing easier.
Cheers,
Andy.
"I Code, Therefore I Am"

[Richard Johnson]

okay sure, this will be very trimmed down from the actual code. The abstract view is just a fancy JPanel that does various other interesting things I use in my application framework, I just call revalidate on it:

public class FrameworkTreeModel extends AbstractModel implements TreeModel
{
   RootNode m_rootNode; // Root Node
   
   Hashtable m_contentList;
   Hashtable m_siteAreaList;
   Hashtable m_siteList;
   LinkedList listeners;
   /**
    *  Constructs a default instance of a tree framework model.
    */
   public FrameworkTreeModel()
   {
      super();
      m_rootNode = new RootNode(-1, "root");
      m_contentList = new Hashtable();
      m_siteAreaList = new Hashtable();
      m_siteList = new Hashtable();
      listeners = new LinkedList();
      regenerateFramework();
   }
   /**
    * Regenerates the model from xml in the temp dir.
    */
   public void regenerateFramework() <------ called from UI button also
   {
      // clear the existing content and site areas.
      m_contentList.clear();
      m_siteAreaList.clear();
      m_siteList.clear();
      m_rootNode.clear();
      
      ....
      // Generate the content, site areas then sites.
      addContent(dirMgr, fMgr, tempDir);     
      addSiteAreas(dirMgr, fMgr, tempDir);
      addSites(dirMgr, fMgr, tempDir);      
      addLinkage();
      
      setChanged();
      notifyObservers();  <<-------  Should notify view that model has changed.
   }
....
}
public class FrameworkController extends AbstractController
{
   private static FrameworkController m_instance;
   private Logger m_log = LoggerController.getLogger(FrameworkController.class);
   /**
    *
    */
   private FrameworkController()
   {      
      // set the tree model
      JTree tree = new JTree((FrameworkTreeModel)m_model);
      FrameworkTreeCellRenderer renderer = new FrameworkTreeCellRenderer();
  tree.setCellRenderer(renderer);
      tree.setRootVisible(false);
      tree.setShowsRootHandles(false);
   
  // register the component with tooltip manager.
  ToolTipManager.sharedInstance().registerComponent(tree);
      ((FrameworkView)m_view).setTree(tree);
   }
....
}
public class FrameworkView extends AbstractView
{
...
      public void setTree(JTree tree)
      {
    m_JTree = tree;
         m_centerScroll = new JScrollPane(m_JTree);
         add(m_centerScroll, BorderLayout.CENTER);
         revalidate();
      }
...
public void update(Observable o, Object arg)
{
m_log.info("Updating the framework view.");
revalidate();
}
...
}