JTree collapse problem

hi all
i have a jtree contains where users can edit text in nodes....
when user finshes editing i want to display the new text keeping the edited node expanded...
all things i have done either make the whole tree collapse or makes the text appear as '.....' instead of what the user has entered..
thnx in advance

Sandra,
I fetch data from a database and show it in a JTree.
Because I have to refresh the tree everytime a node is
expanded I had to overwrite the default expand()
method.why do you have to refresh the tree? can you pls explain...
Now in expand() I fetch the data, build a new
tree and fire treeStructureChanged(rootNode) and make
then a call to super.expand(path). This works fine,
but now the tree doesn't know which node is expanded
and which is not and it always trys to expand a node
even if it is already expanded. this sounds horrendous and way to much. why do you need to build a new tree every time?
Maybe somebody had the same problem and/or can help
me?i have written many trees (so to speak ;) which dynamically load data from DBs. so there are my 2 cents:
1) don't overwrite methods of JTree, it is not necessary (in most cases) and way to complex, interfering with the tree model et al
2) if you use the appr. classes (DefaultTreeModel, DefaultMutableTreeNode, etc) most things are achieved by firing the appr. events (if not done already by those classes).
3) in most cases you only will need a custom cell renderer to show the data in a way you like/need.
send some more details of your problems, maybe there are other/more efficient ways of achieving your goals.
thomas

Similar Messages

JTree with XML content expand/collapse problem

Hello all,
I'm having this very weird problem with a JTree I use to display the contents of an XML file. I use the DOM parser (and not JDOM since I want the application to run as an applet as well, and don't want to have any external libraries for the user to download) and have a custom TreeModel and TreeNode implementations to wrap the DOM nodes so that they are displayed by the JTree.
I have also added a popup menu in the tree, for the user to be able to expand/collapse all nodes under the selected one (i.e. a recursive method).
When expandAll is run, everything works fine and the children of the selected node are expanded (and their children and so on).
However, after the expansion when I run the collapseAll function, even though the selected node collapses, when I re-expand it (manually not by expandAll) all of it's children are still fully open! Even if I collapse sub-elements of the node manually and then collapse this node and re-expand it, it "forgets" the state of it's children and shows them fully expanded.
In other words once I use expandAll no matter what I do, the children of this node will be expanded (once I close it and re-open it).
Also after running expandAll the behaviour(!) of the expanded nodes change: i have tree.setToggleClickCount(1); but on the expanded nodes I need to double-click to collapse them.
I believe the problem is related to my implementations of TreeModel and TreeNode but after many-many hours of trying to figure out what's happening I'm desperate... Please help!
Here's my code:
public class XMLTreeNode implements TreeNode
     //This class wraps a DOM node
    org.w3c.dom.Node domNode;
    protected boolean allowChildren;
    protected Vector children;
    //compressed view (#text).
     private static boolean compress = true;
    // An array of names for DOM node-types
    // (Array indexes = nodeType() values.)
    static final String[] typeName = {
        "none",
        "Element",
        "Attr",
        "Text",
        "CDATA",
        "EntityRef",
        "Entity",
        "ProcInstr",
        "Comment",
        "Document",
        "DocType",
        "DocFragment",
        "Notation",
    static final int ELEMENT_TYPE =   1;
    static final int ATTR_TYPE =      2;
    static final int TEXT_TYPE =      3;
    static final int CDATA_TYPE =     4;
    static final int ENTITYREF_TYPE = 5;
    static final int ENTITY_TYPE =    6;
    static final int PROCINSTR_TYPE = 7;
    static final int COMMENT_TYPE =   8;
    static final int DOCUMENT_TYPE = 9;
    static final int DOCTYPE_TYPE = 10;
    static final int DOCFRAG_TYPE = 11;
    static final int NOTATION_TYPE = 12;
    // The list of elements to display in the tree
   static String[] treeElementNames = {
        "node",
// Construct an Adapter node from a DOM node
public XMLTreeNode(org.w3c.dom.Node node) {
    domNode = node;
public String toString(){
       if (domNode.hasAttributes()){
            return domNode.getAttributes().getNamedItem("label").getNodeValue();
       }else return domNode.getNodeName();
public boolean isLeaf(){
       return (this.getChildCount()==0);
boolean treeElement(String elementName) {
      for (int i=0; i<treeElementNames.length; i++) {
        if ( elementName.equals(treeElementNames)) return true;
return false;
public int getChildCount() {
     if (!compress) {
return domNode.getChildNodes().getLength();
int count = 0;
for (int i=0; i<domNode.getChildNodes().getLength(); i++) {
org.w3c.dom.Node node = domNode.getChildNodes().item(i);
if (node.getNodeType() == ELEMENT_TYPE
&& treeElement( node.getNodeName() ))
// Note:
// Have to check for proper type.
// The DOCTYPE element also has the right name
++count;
return count;
public boolean getAllowsChildren() {
     // TODO Auto-generated method stub
     return true;
public Enumeration children() {
     // TODO Auto-generated method stub
     return null;
public TreeNode getParent() {
     // TODO Auto-generated method stub
     return null;
public TreeNode getChildAt(int searchIndex) {
org.w3c.dom.Node node =
domNode.getChildNodes().item(searchIndex);
if (compress) {
// Return Nth displayable node
int elementNodeIndex = 0;
for (int i=0; i<domNode.getChildNodes().getLength(); i++) {
node = domNode.getChildNodes().item(i);
if (node.getNodeType() == ELEMENT_TYPE
&& treeElement( node.getNodeName() )
&& elementNodeIndex++ == searchIndex) {
break;
return new XMLTreeNode(node);
public int getIndex(TreeNode tnode) {
     if (tnode== null) {
          throw new IllegalArgumentException("argument is null");
     XMLTreeNode child=(XMLTreeNode)tnode;
     int count = getChildCount();
     for (int i=0; i<count; i++) {
          XMLTreeNode n = (XMLTreeNode)this.getChildAt(i);
          if (child.domNode == n.domNode) return i;
     return -1; // Should never get here.
public class XMLTreeModel2 extends DefaultTreeModel
     private Vector listenerList = new Vector();
     * This adapter converts the current Document (a DOM) into
     * a JTree model.
     private Document document;
     public XMLTreeModel2 (Document doc){
          super(new XMLTreeNode(doc));
          this.document=doc;
     public Object getRoot() {
          //System.err.println("Returning root: " +document);
          return new XMLTreeNode(document);
     public boolean isLeaf(Object aNode) {
          return ((XMLTreeNode)aNode).isLeaf();
     public int getChildCount(Object parent) {
          XMLTreeNode node = (XMLTreeNode) parent;
return node.getChildCount();
     public Object getChild(Object parent, int index) {
XMLTreeNode node = (XMLTreeNode) parent;
return node.getChildAt(index);
     public int getIndexOfChild(Object parent, Object child) {
if (parent==null || child==null )
     return -1;
          XMLTreeNode node = (XMLTreeNode) parent;
return node.getIndex((XMLTreeNode) child);
     public void valueForPathChanged(TreePath path, Object newValue) {
// Null. no changes
     public void addTreeModelListener(TreeModelListener listener) {
          if ( listener != null
&& ! listenerList.contains( listener ) ) {
listenerList.addElement( listener );
     public void removeTreeModelListener(TreeModelListener listener) {
          if ( listener != null ) {
listenerList.removeElement( listener );
     public void fireTreeNodesChanged( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesChanged( e );
     public void fireTreeNodesInserted( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesInserted( e );
     public void fireTreeNodesRemoved( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesRemoved( e );
     public void fireTreeStructureChanged( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeStructureChanged( e );
The collapseAll, expandAll code (even though I m pretty sure that's not the problem since they work fine on a normal JTree):
    private void collapseAll(TreePath tp){
         if (tp==null) return;
         Object node=tp.getLastPathComponent();
         TreeModel model=tree.getModel();
         if (!model.isLeaf(node)){
              tree.collapsePath(tp);
              for (int i=0;i<model.getChildCount(node);i++){
              //for (int i = node.childCount()-4;i>=0;i--){
                   collapseAll(tp.pathByAddingChild(model.getChild(node,i)));
              tree.collapsePath(tp);
    private void expandAll(TreePath tp){
         if (tp==null) return;
         Object node=tp.getLastPathComponent();
         TreeModel model=tree.getModel();
         if (!model.isLeaf(node)){
              tree.expandPath(tp);
              for (int i=0;i<model.getChildCount(node);i++){
              //for (int i = node.childCount()-4;i>=0;i--){
                   expandAll(tp.pathByAddingChild(model.getChild(node,i)));

Hi,
Iam not facing this problem. To CollapseAll, I do a tree.getModel().reload() which causes all nodes to get collapsed and remain so even if I reopen them manually.
Hope this helps.
cheers,
vidyut

JTree Refesh problem

Hello --
I've searched this subject ad nauseum on these forums and the rest of the web, and I'm still coming up blank.
Basically, I have a file structure JTree. To do a "refresh" view, I basically kill the original object, and rebuild it again -- while first storing the last TreePath the user was on.
Since this tree is built dynamically, placeholders are used to tell if the parent node has any children. From there, it looks up its children.
During the refresh, I fire the tree.expandPath(path), and in my expansion listener, it should take care of the rest.
Well, it seems like all the steps are going correctly, due to the debug output I'm getting, but I can't get the tree to scroll to the path. Here's the reload part:
public void refreshTree(TreePath path){
   TP tp = null;
   Object [] obj = path.getPath();
     for (int i = 2; i <= obj.length; i++){
          tp = new TP(obj, i);
       tree.expandPath(tp.getTP());
//I've tried these in the for loop to no avail
//               tree.setSelectionPath(tp.getTP());
//              tree.scrollPathToVisible(tp.getTP());
       //this should be the last and final TreePath object
     tree.expandPath(tp.getTP());
     //tree.getSelectionModel().setSelectionPath(tp.getTP());
          tree.setSelectionPath(tp.getTP());
     tree.scrollPathToVisible(tp.getTP());
     //this class exists so I can build the treepath one
        //leaf at a time
     class TP extends TreePath{
          public TP(Object[] obj, int length){
               super(obj, length);
          public TreePath getTP(){
               return this;
     }I've tried rebuild and all, and it seems like everything is doing what it's supposed to except drawing it right. Here's the code for the expansion:
class selectionListener implements TreeExpansionListener{
   public void treeExpanded(TreeExpansionEvent evt){
     DefaultMutableTreeNode node = getTreeNode(evt.getPath());
     TreeNode firstBorn = node.getFirstChild();
     if (firstBorn.toString().equals(PLACEHOLDER)){
          System.out.println("made it"); //debug
          populateTree(evt.getPath()); //this gets the new stuff
public void treeCollapsed(TreeExpansionEvent evt){}
}So, again, it seems like everything is firing the way it should, it's just not redrawing the tree to the current path.
I'm on Java 1.4[02], Windows 2K, and JTree is set to SINGLE selection mode. If you need any additional information, please let me know.
Thank you very much for your time.
-Steve

It seems that the tree is firing a node change itself, because I have code executing in the
public void treeExpanded(TreeExpansionEvent evt)
function.
I also put a bit of debug code in... I have
System.out.println("Is collapsed? " + tree.isCollapsed(tp.getTP()));
Inside my for loop... the output is false everytime.
So it seems that everything exists, it's just not repainting the gui for some reason or other. I'm not spinning off seperate threads to do anything, so I'd assume it's not a thread problem.
Any ideas? This is really getting frustrating, for something I thought would be so simple.

JTree corruption problem when expanding paths (sometimes)

Sometimes when adding nodes or expanding paths in my JTree I get a really weird corruption. Here's screenshots of the problem:
http://linuxhelp.homeunix.com/screen1.png
http://linuxhelp.homeunix.com/screen2.png
How can I stop this from happening?
Adam

Hi!
I also had this problem but it works fine using SwingUtilities.invokeLater
/Malin
private class ExpandListener implements TreeWillExpandListener {
TreePath path = null;
public void treeWillCollapse(TreeExpansionEvent e) {
public void treeWillExpand(TreeExpansionEvent e) {
path = e.getPath();
collapseAll();
if (path != null) {
// If we don't scroll later it doesn't work correctly in some cases
SwingUtilities.invokeLater(new Runnable() {
public void run() {
scrollPathToVisible(path);
* Collapses the tree.
public void collapseAll() {
for (int i = root.getChildCount(); i > 0; i--) {
collapseRow(i);

JTree handles problems

Hi everyone!
I have a problem with handles in my JTree. The JTree is populated dynamically via RMI and and acts on expand. When I collapse a node I erase all childs so that I wont get double entries the next time I expand that node. The problem is that the + symbol disappears when i collapse since there is no children until you expand. Is there a way to force the + symbol to be visible all the time? I've tried to override the isLeaf() method to always return false but it doesn't change the behavior. The thing is that I have to erase all childs every time you collapse since the structure migth have been changed by other users.
Any ideas?
Thanx in advance!!!

When I collapse a node I erase all childs so that I wont get double >entries the next time I expand that node
Why make a dummy node ...You stated that on collapse was when the erase was done.

JTree Inserting Problem

Please help me ..
i have write a code ..which is when the user clicks the button...
a jtree table will come and the values inside the jtree will be filled by the contents of the selected items in the form...
but my problem is jtree only is comming
i created the object class ... but ...
the initialisation is not happening...
plz check the code below .. this is my class
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
public class Reservation extends JFrame implements ItemListener,ActionListener{
     JComboBox fromCity = null;
     JComboBox toCity = null;
     JComboBox dDay = null;
     JComboBox dMonth = null;
     JComboBox dYear = null;
     JComboBox rDay = null;
     JComboBox rMonth = null;
     JComboBox rYear = null;
     JComboBox adult = null;
     JComboBox Cabin = null;
     JFrame table;
     public Reservation()
          setSize(600,400);
          JPanel p = new JPanel();
          //getContentPane().setLayout(new BorderLayout());
          GridBagLayout gbl = new GridBagLayout();
          GridBagConstraints gbc = new GridBagConstraints();
          p.setLayout(gbl);
          String []cities = {"New York","Chicago","Miami","Pittsburgh","Memphis","New Orleans"};
          String [] days={"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","27","28","29","30","31"};
          String [] months = {"January","Feburary","March","April","May","June","July","August","September","October","November","December"};
          String [] year = {"2006","2007"};
          String [] adt = {"1","2","3","4"};
          String [] cab = {"Buisness","Economy"};
          fromCity = new JComboBox(cities);
          fromCity.setSelectedIndex(0);
          toCity = new JComboBox(cities);
          toCity.setSelectedIndex(0);
          dDay = new JComboBox(days);
          dMonth = new JComboBox(months);
          dYear = new JComboBox(year);
          rDay = new JComboBox(days);
          rMonth = new JComboBox(months);
          rYear = new JComboBox(year);
          adult = new JComboBox(adt);
          Cabin = new JComboBox(cab);
          JLabel frmCity = new JLabel("From");
          frmCity.setLabelFor(fromCity);
          JLabel tCity = new JLabel("To");
          tCity.setLabelFor(tCity);
          JLabel dDate = new JLabel("Departure Date");
          dDate.setLabelFor(dDate);
          JLabel rDate = new JLabel("Return Date");
          rDate.setLabelFor(rDate);
          JLabel Psg = new JLabel("Pasengers");
          Psg.setLabelFor(Psg);
          JLabel Adults = new JLabel("Adults");
          Adults.setLabelFor(Adults);
          JLabel cabin = new JLabel("Cabin");
          cabin.setLabelFor(cabin);
          JLabel search = new JLabel("Search By");
          search.setLabelFor(search);
          JRadioButton ROneWay = new JRadioButton("One Way");
          JRadioButton RRoundTrip = new JRadioButton("Round Trip");
          JButton searchbutton = new JButton("Date");
          ButtonGroup group = new ButtonGroup();
          group.add(ROneWay);
          group.add(RRoundTrip);
          gbc.gridx = 0;
          gbc.gridy = 0;
          gbc.insets = new Insets(0,30,0,0);
          p.add(frmCity,gbc);
          gbc.gridx =1;
          gbc.gridy = 0;
          gbc.insets = new Insets(0,30,0,0);
          p.add(fromCity,gbc);
          gbc.gridx =0;
          gbc.gridy = 1;
          gbc.insets = new Insets(0,30,0,0);
          p.add(tCity,gbc);
          gbc.gridx =1;
          gbc.gridy = 1;
          gbc.insets = new Insets(10,30,0,0);
          p.add(toCity,gbc);
          gbc.gridx = 0;
          gbc.gridy = 2;
          gbc.insets = new Insets(10,50,0,0);
          p.add(ROneWay,gbc);
          gbc.gridx = 1;
          gbc.gridy = 2;
          gbc.insets = new Insets(10,30,0,0);
          p.add(RRoundTrip,gbc);
          gbc.gridx = 1;
          gbc.gridy = 3;
          gbc.insets = new Insets(0,0,0,0);
          p.add(dDate,gbc);
          gbc.gridx = 0;
          gbc.gridy = 4;
          p.add(dDay,gbc);
          gbc.gridx = 1;
          gbc.gridy = 4;
          p.add(dMonth,gbc);
          gbc.gridx = 2;
          gbc.gridy = 4;
          p.add(dYear,gbc);
          gbc.gridx = 1;
          gbc.gridy = 5;
          gbc.insets = new Insets(0,0,0,0);
          p.add(rDate,gbc);
          gbc.gridx = 0;
          gbc.gridy = 6;
          p.add(rDay,gbc);
          gbc.gridx = 1;
          gbc.gridy = 6;
          p.add(rMonth,gbc);
          gbc.gridx = 2;
          gbc.gridy = 6;
          p.add(rYear,gbc);
          gbc.gridx = 1;
          gbc.gridy = 7;
          p.add(Psg,gbc);
          gbc.gridx = 0;
          gbc.gridy = 8;
          p.add(Adults,gbc);
          gbc.gridx = 1;
          gbc.gridy = 8;
          p.add(adult,gbc);
          gbc.gridx = 0;
          gbc.gridy = 9;
          p.add(cabin,gbc);
          gbc.gridx = 1;
          gbc.gridy = 9;
          gbc.insets = new Insets(10,0,0,0);
          p.add(Cabin,gbc);
          gbc.gridx = 0;
          gbc.gridy = 10;
          p.add(search,gbc);
          gbc.gridx = 1;
          gbc.gridy = 10;
          gbc.insets = new Insets(10,0,0,0);
          p.add(searchbutton,gbc);
          getContentPane().add(p);
          fromCity.addItemListener(this);
          toCity.addItemListener(this);
          dDay.addItemListener( this);
          dMonth.addItemListener( this);
          dYear.addItemListener(this);
          adult.addItemListener(this);
          Cabin.addItemListener(this);
          searchbutton.addActionListener(this);
          //Jtable form
          table = new JFrame();
          Container container;
          container = table.getContentPane();
          JPanel jpanel = new JPanel(new GridLayout(2,1));
          container.setLayout(new GridLayout(2,1));
          JLabel l1 = new JLabel("Departure Journey");
          l1.setLabelFor(l1);
          container.add(l1);
          final String[] colHeads = {"","Flightno","Date","Departure Time","Arrival Time","Flight","Duration","Fare"};
          final Object[ ][ ] data = new Object[10][10];
          JTable table = new JTable(data,colHeads);
          int v=ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
          int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
          JScrollPane jsp = new JScrollPane(table,v,h);
          container.add(jsp,BorderLayout.CENTER);
     String ffcity,ttcity,dday,dmon,dyear,adt,cab;
     public void itemStateChanged(ItemEvent e)
          ffcity = (String)fromCity.getSelectedItem();
          ttcity = (String)toCity.getSelectedItem();
          dday = (String)dDay.getSelectedItem();
          dmon = (String)dMonth.getSelectedItem();
          dyear = (String)dYear.getSelectedItem();
          adt = (String)adult.getSelectedItem();
          cab = (String)Cabin.getSelectedItem();
     public void actionPerformed(ActionEvent ae)
     if(ae.getActionCommand() == "Date")
          try
          Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          Connection con = DriverManager.getConnection("jdbc:odbc:ds","sa", "");
          PreparedStatement stmt = con.prepareStatement("select ifno,vdtime,vatime,vdate1,vdate2,vdate3,efare from airways where fcity = ? and tcity = ? and vdate1 = ? and vdate2 = ? and vdate3 = ?");
          stmt.setString(1,ffcity);
          stmt.setString(2,ttcity);
          stmt.setString(3,dday);
          stmt.setString(4,dmon);
          stmt.setString(5,dyear);
          ResultSet d = stmt.executeQuery();
          /* int count=0;
          while(d.next())
          {count++;
          int i = 0;*/
          while(d.next())
          /*for(int j =1;j<=7;j++)
          data[i][j] = rs.getString(j);
          System.out.println(" " + data[i][j]);
          }i++;*/
          System.out.println(d.getInt(1));
          System.out.println(d.getDouble(2));
          catch(Exception ex)
               System.out.println("Error occurred");
               System.out.println("Error:"+ex);
          table.setVisible(true);
          table.setSize(300,200);
     private static void createAndShowGUI()
          JFrame.setDefaultLookAndFeelDecorated(true);
          Reservation r=new Reservation();
          JFrame frame = new JFrame("Reservation Form");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          //r.pack();
          r.setVisible(true);
     public static void main(String[] args)
          SwingUtilities.invokeLater(new Runnable(){
               public void run()
                    createAndShowGUI();
in this object creation is not happening
when i run this code ...
only jtree is comming..
how can i make it the values of seceted items to come in table
i commented the parts that having error..
when u uncomment it u will get the problem of this code

please anyone

JTree selection problem when using custom renderer and editor

Hello:
I created a JTree with custom renderer and editor.
The customization makes JCheckBox to be the component
responsible for editing and rendering.
The problem is that when I click on the node with the checkbox
the JTree selection model does not get updated.
Without customizations of the editor and renderer the MouseEvent would be fired and BasicTreeUI$MouseHandler.mousePressed() method would call
the selectPathForEvent() method which would be responsible for updating
the selection model. At the same time if I attach a mouse listener to the JTree (customized) I see the events when clicking on the nodes. It seems like the MouseEvent gets lost and somehow as a result of which the selection model does not get updated.
Am I missing something?
Thanks
Alexander

You probably forgot to call super.getTreeCellRendererComponent(...) at the beginning of your getTreeCellRendererComponent(...) method in your custom renderer.
Or maybe in the getTreeCellEditorComponent(...) of the TreeCellEditor...

JTree Repaint Problem .

I'm creating a dynamic JTree by querying th DB. The JTree has to reflect the changes if any.
But the problem is that although I'm getting all the correct nodes in the JTree, the tree display is not repainted if the window is maximized or focussed and the tree area is displayed grey. Other components like buttons etc are correctly visible.
If I click in the greyed area of the JTree then that particular node is visible and the rest nodes are hidden.
same problem comes when I have a JPopup for the nodes.. It leaves a greyed rectangle in place of the JPopup.
Any suggestions will be a great help.
- Praveen

I tried the reload , revalidate and the repaint method of the Treemodel, but nothing changed... its all the same.I'd like to explain in full what am I doing.
I have some items in the DB which are shown in the JTree. When any Item is added to the DB I poll the DB
after an interval to check new entries or deleted entries, and this is to be updated to the JTree.
The additions and deletions are going on properly a/c to the DB the only problem being that , that if the window(JFrame) containing the JTree (JTree is contained in JScrollPane) is minimized or hidden, then only the JTree is greyed and not the other components such as the buttons.
Interestingly if I double click in the JTree area then the Jtree becomes visible properly. This happens after each update of the JTree.
Hope this description will give a better view.
Thanks for all your previous helpful hints.

JTree selection problem

I have a problem trying to select a node of a JTree using JDK 1.3.1 and JDK 1.4 beta 3. I use a JTree with a DefaultTreeModel and DefaultMutableTreeNodes.
Before the tree became visible it has all the nodes loaded but not visible. Then I want to select a path of the tree using a node (DefaultMutableTreeNode) but I not able to do it.
The path isn't selected and isn't visible.
I use the following code:
jTree.setExpandsSelectedPaths(true)
jTree.setSelectionPath(new TreePath(node.getPath()));
//I've also tried with
jTree.expandPath(new TreePath(dmtn.getPath()));Thanks.

Fair enough. I guess I need to do a bit more reading.
You have to create a new TreePath object because the
getPath() method of DefaultMutableTreeNode returns an
array of TreeNodes where as the setSelected method of
JTree requires a TreePath object.
Why are you creating a new path with the contents ofa
call to getPath?
wouldn't node.getPath() be what you want toexpend/set
visible/scroll to etc
try it without creating a new TreePath

JTree scrollbar problem - can't scroll back to top when some nodes hidden

I have a problem which I cannot resolve: I have a JTree which has had 88 rows added to it, and which then has 15 or so rows set to be not visible; when I then scroll to the bottom of the pane I am unable to scroll all the way back to the top using either the scroll button at the top of the bar or the mouse scroll wheel although I can drag the knob to get to the top; using the button or wheel, the scrolling stops somewhat short of the top; via testing I've found that the AdjustmentEvent is not fired when it reaches that point. Anyone seen this before and/or know a way around it?
Thanks in advance,
Mike

MikeAuerbach267 wrote:
It turns out that my problem was due to the fact that I am using my own TreeCellRenderer which makes invisible some nodes via user option but doesn't reload the tree; hence the confusion as to the scrollbar size. I now correctly reload after user option has changed rather than render nodes invisible and all is fine. Which reinforces Andrew's view in reply #1 that a 'vague waving about of hands' does not allow the forum members to help.

DW CS3 Tag Collapse Problem

I am working with a trial version of Dreamweaver CS3. In code
view, when highlighting a collapsed tag and using the Properties
Panel to change the class, the entire tag expands. A comment on the
same line as the closing tag is moved to the next line. When the
comment is moved back up to the closing tag line, you have to hit
'Refresh' to view the properties. Also, the names of available
classes are truncated until you click the drop down list. None of
this happens in Dreamweaver 8. This is a real pain and definately a
downgrade from DW 8. If anyone can offer a solution to this it will
be appreciated.

Here is a pared down version of my code which demonstrates
the problem. The CSS code is contained in an external file. Both
the CSS and HTML files can be duplicated easily.
HTML Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8" />
<title>DW CS3 Collapse Problbem</title>
<link href="dwcs3.css" rel="stylesheet" type="text/css"
/>
</head>
<body>
<table width="500" border="0" cellpadding="0"
cellspacing="0" class="feature1">
<tr>
<td width="370" height="250" valign="middle"><img
src="" width="370" height="223" alt=""></td>
</tr>
</table> 
</body>
</html>
CSS Code:
.feature1 {background-color: #F5ECE0;}
.feature2 {background-color: #FFFFFF;}
To duplicate the problem:
1. Create an HTML and CSS file by cutting and pasting the
above code being careful to match the CSS file name to the link
href in the HTML file.
2. Place the cursor in the table tag and collaps the tag.
Make sure the collapsed tag is selected.
3. If not already opened, dpen the Properteries Panel and
click Refresh, if needed.
4. Click the arrow next to the Class list to expand the list.
Select an item to change from 'feature1' to 'feature2' or visea
versa.
When you change the class the table tag expands and the
comment "<--end table-->" is moved to the line below the
closing table tag. Moving the comment back to the correct line
causes you to have to refresh to again view the Properties Panel.
I trust this example is clearer than my initial post. Do not
hesitate to contact ma again should you need further clarification.

JTree, strange problem

I created a JTree on top of a DefaultMutatableTreeNode by using the constructor JTree(TreeNode root)
I tried removing all leaf nodes of the model, using node.removeFromParent(). And unsurprisingly the UI is automatically updated.
After that, i reinsert new leaf nodes(they are new instances having new physical address) into the model, using parent.add(node). And unsurprisingly, the UI is automatically updated. The JTree looks powerful at the moment, i am quite satisfied with it.
However the nightmare comes, when i click on the leaf nodes on the UI and the getLastSelectedPathCompoent() mystically returned the already-removed leaf nodes but not the newly-inserted leaf nodes.
I tried debugging for a couple of hours, but failed! I think i am doing something really wrong :( Anyone help me out? Thanks a lot!

problem solved:)
solved by calling the updateUI() for the removal operation.....

JTree renderer problem

I have listed below a shor example.
What I need is a method to do each cell to be as wide as the tree is (see the red border line), even if I resize the window. And ofcourse, the tree should keep a minimum width so every cell is fully shown.
I'll be waiting for your answers. Thanks.
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
public class TreeExample extends JFrame {
    public TreeExample() {
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        getContentPane().add(new JScrollPane(new SomeTree()));
        pack();
    public static void main(String[] args) {
       SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TreeExample().setVisible(true);
class SomeTree extends JTree {
    public SomeTree() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
        String str = "***";
        for (int i = 0; i < 10; i++) {
            root.add(new DefaultMutableTreeNode(str));
            str += "***";
        setModel(new DefaultTreeModel(root));
        setCellRenderer(new SomeCellRenderer());
        setBorder(BorderFactory.createLineBorder(Color.RED));
class SomeCellRenderer extends JLabel implements TreeCellRenderer {
    public Component getTreeCellRendererComponent(JTree tree, Object value,
                                                      boolean selected, boolean expanded,
                                                      boolean leaf, int row,
                                                      boolean hasFocus) {
        setOpaque(true);
        setText(value.toString());
        setBackground(Color.LIGHT_GRAY);
        return this;
}

The only problem i can figure is maybe the layout. Flowlayout is squeezing the size of the buttons so that they can appear in the little area that they do get. If you use borderlayout instead of the flowlayout, it may solve your problem. If that also doesn't work then set the minimum sizes of the labels.

Spry Accordion collapsing problem

I am using an accordion on my site, and also took the advice to update to the latest spry, which didn't seem to make a lot of difference to be honest (I am using DW CS3)
But the problem I am having is when you first come to the page the menu isn't completely collapsed and I wonder if there is a way of doing this...
This is not happening in latest firefox, IE8 or safari on a windows pc
here is a link to the page http://www.antworks.co.uk/mobymemory/menu.html
see the code below. Any help would be greatly appreciated. Thanks
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script src="SpryAssets/SpryAccordion.js" type="text/javascript"></script>
<link href="SpryAssets/SpryAccordion.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="Accordion1" class="Accordion" tabindex="0">
<div class="AccordionPanel">
<div class="AccordionPanelTop" onclick="Accordion1.openPanel(0); return false;">memory cards (make)</div>
<div class="AccordionPanelContent">
<img src="images/new/trans.gif" width="7" height="7" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="12" /><br />micro SD / Transflash<br />
<img src="images/new/trans.gif" width="7" height="3" />
</div>
</div>
<div class="AccordionPanel">
<div class="AccordionPanelTab" onclick="Accordion1.openPanel(1); return false;">memory cards (brand)</div>
<div class="AccordionPanelContent2">Content 2</div>
</div>
<div class="AccordionPanel">
<div class="AccordionPanelTab" onclick="Accordion1.openPanel(2); return false;">mobile accessories</div>
<div class="AccordionPanelContent">Content 2</div>
</div>
<div class="AccordionPanel">
<div class="AccordionPanelTab" onclick="Accordion1.openPanel(3); return false;">gaming</div>
<div class="AccordionPanelContent">Content 2</div>
</div>
<div class="AccordionPanel">
<div class="AccordionPanelTab" onclick="Accordion1.openPanel(4); return false;">computing</div>
<div class="AccordionPanelContent">Content 2</div>
</div>
<div class="AccordionPanel">
<div class="AccordionPanelBot" onclick="Accordion1.openPanel(5); return false;">customer login</div>
<div class="AccordionPanelContent">Content 2</div>
</div>
</div>
<script type="text/javascript">

</script>
</body>
</html>
css
@charset "UTF-8";
/* SpryAccordion.css - Revision: Spry Preview Release 1.4 */
/* Copyright (c) 2006. Adobe Systems Incorporated. All rights reserved. */
/* This is the selector for the main Accordion container. For our default style,
* we draw borders on the left, right, and bottom. The top border of the Accordion
* will be rendered by the first AccordionPanelTab which never moves.
* If you want to constrain the width of the Accordion widget, set a width on
* the Accordion container. By default, our accordion expands horizontally to fill
* up available space.
* The name of the class ("Accordion") used in this selector is not necessary
* to make the widget function. You can use any class name you want to style the
* Accordion container.
.Accordion {
width: 174px;
overflow: hidden;
/* This is the selector for the AccordionPanel container which houses the
* panel tab and a panel content area. It doesn't render visually, but we
* make sure that it has zero margin and padding.
* The name of the class ("AccordionPanel") used in this selector is not necessary
* to make the widget function. You can use any class name you want to style an
* accordion panel container.
.AccordionPanel {
margin: 0px;
padding: 0px;
/* This is the selector for the AccordionPanelTab. This container houses
* the title for the panel. This is also the container that the user clicks
* on to open a specific panel.
* The name of the class ("AccordionPanelTab") used in this selector is not necessary
* to make the widget function. You can use any class name you want to style an
* accordion panel tab container.
.AccordionPanelTab {
background-color: #CCCCCC;
letter-spacing: -0.04em;
background-image: url(../images/new/spry/meun_blue.gif);
background-repeat: no-repeat;
padding: 8px 0 0 12px;
height: 21px;
font-family: Arial, Helvetica, sans-serif;
color:#666666;
font-size: 14px;
font-weight: bold;
margin: 0px;
cursor: pointer;
-moz-user-select: none;
-khtml-user-select: none;
.AccordionPanelTop {
background-color: #CCCCCC;
letter-spacing: -0.04em;
background-image: url(../images/new/spry/meun_top.gif);
background-repeat: no-repeat;
padding: 8px 0 0 12px;
height: 22px;
font-family: Arial, Helvetica, sans-serif;
color:#666666;
font-size: 14px;
font-weight: bold;
margin: 0px;
cursor: pointer;
-moz-user-select: none;
-khtml-user-select: none;
.AccordionPanelBot {
background-color: #CCCCCC;
letter-spacing: -0.04em;
background-image: url(../images/new/spry/meun_bot.gif);
background-repeat: no-repeat;
padding: 8px 0 0 12px;
height: 21px;
font-family: Arial, Helvetica, sans-serif;
color:#666666;
font-size: 14px;
font-weight: bold;
margin: 0px;
cursor: pointer;
-moz-user-select: none;
-khtml-user-select: none;
/* This is the selector for a Panel's Content area. It's important to note that
* you should never put any padding on the panel's content area if you plan to
* use the Accordions panel animations. Placing a non-zero padding on the content
* area can cause the accordion to abruptly grow in height while the panels animate.
* Anyone who styles an Accordion *MUST* specify a height on the Accordion Panel
* Content container.
* The name of the class ("AccordionPanelContent") used in this selector is not necessary
* to make the widget function. You can use any class name you want to style an
* accordion panel content container.
.AccordionPanelContent {
letter-spacing: -0.05em;
background-image: url(../images/new/spry/meun_grey.gif);
background-repeat: repeat-y;
padding: 0 0 0 12px;
font-family: Arial, Helvetica, sans-serif;
color:#7f879e;
font-size: 14px;
font-weight: bold;
overflow: hidden;
margin: 0px;
.AccordionPanelContent2 {
letter-spacing: -0.05em;
background-image: url(../images/new/spry/meun_grey.gif);
background-repeat: repeat-y;
padding: 0 0 0 12px;
font-family: Arial, Helvetica, sans-serif;
color:#7f879e;
font-size: 14px;
font-weight: bold;
overflow: auto;
margin: 0px;
height: 200px;
/* This is an example of how to change the appearance of the panel tab that is
* currently open. The class "AccordionPanelOpen" is programatically added and removed
* from panels as the user clicks on the tabs within the Accordion.
.AccordionPanelOpen .AccordionPanelTab {
background-color: #EEEEEE;
/* This is an example of how to change the appearance of the panel tab as the
* mouse hovers over it. The class "AccordionPanelTabHover" is programatically added
* and removed from panel tab containers as the mouse enters and exits the tab container.
.AccordionPanelTabHover {
color: #555555;
.AccordionPanelOpen .AccordionPanelTabHover {
color: #555555;
/* This is an example of how to change the appearance of all the panel tabs when the
* Accordion has focus. The "AccordionFocused" class is programatically added and removed
* whenever the Accordion gains or loses keyboard focus.
.AccordionFocused .AccordionPanelTab {
background-color: #3399FF;
/* This is an example of how to change the appearance of the panel tab that is
* currently open when the Accordion has focus.
.AccordionFocused .AccordionPanelOpen .AccordionPanelTab {
background-color: #33CCFF;

Teisho wrote:
Thanks for your answer, the problem that I still have is that I am trying to close all the Accordions when clicking
on the last panel.
I have looked at the Accordion.closePanel() , but that throws an error
http://labs.adobe.com/technologies/spry/articles/data_api/apis/accordi on.html
thanks Ant
I am not sure what you want to do here. When you click on an open panel, the panel closes; when you click on a closed panel, it opens and closes any panel that is open.
Please explain.
Sorry, did not see your new post which does explain what you want.
Message was edited by: vw2ureg

Jtree casting problem

Hi ,
I am new to java swings, I am having problem with jtree casting.
I have the tree which I created in the similar way as DNDTree
The tree has 4 types such as model/subject/entity/attribues each
of different class. My problem is when I drag and drop .. later I have
to save the tree with all the properties into respective tables. Please
help me how do I accomplish.
Thanks

Hi, This is the error I m getting.
Excpetion is javax.swing.tree.DefaultMutableTreeNode cannot be cast to com.idecisions.cdi.hme_prac.MySubjectNodejava.lang.ClassCastException: javax.swing.tree.DefaultMutableTreeNode cannot be cast to com.idecisions.cdi.hme_prac.MySubjectNode
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Window.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)

JTree collapse problem

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