JList and JTree

Hello,
I have a list of servers in a JList( is a seperate class) and when i am selecting a server name from the JList i am calling this value in my main class and I am trying to use this selected value from the Jlist to create a new JTree node but the value is not being displayed as a node.
Any body having ideas as to why?
Reg,
suri

Hello,
Thanks for ur replies. I have tried the following way but still no results the node is not appearing in the JTree.
Here logon(this is a listBox class and contains a JList with a list of server names)
and root1 is the parent .
DefaultMutableTreeNode new1 = new DefaultMutableTreeNode(logon.getValue(), true);
int childCnt = root1.getChildCount();
treeModel.insertNodeInto(new1, root1, childCnt);
treeModel.reload(new1);
treeModel.nodeStructureChanged(new1);
JTree1.revalidate();
JPanel1.revalidate();
Any body any ideas .
Thanks,
reg,
suri

Similar Messages

Consume MouseEvent to prevent JList and JTree from receiving?!

I have a JTree and a JList where I have made the CellRenderer so that it has a "button" area. When this button is clicked, I want something to happen. This I have achieved just nicely with a MouseListener, as per suggestion from JavaDocs.
However, the problem is that when a click is deemed to be within the "button", I do not want the tree or list to process it anymore. But doing e.consume(), both on mousePressed or mouseClicked (though it obviously is pressed the JList and JTree themselves listen to) doesn't do jack.
How can I achieve this functionality?

da.futt wrote:
stolsvik wrote:
Okay, I managed with a hack: It is the order of listeners that's the problem: The ListUI's MouseListener is installed before mine, and hence will get the MouseEvent before me, so it has already processed it when I get it, and hence consuming it makes no difference. No. Normally, listeners are notified latest-registered to earliest-registered. I don't remember seeing an exception to that rule in the core API. well, you are both right (or wrong ;-) - the rule is: the order of listener notification is undefined, it's an implementation detail which listeners must not rely on. "Anecdotical" experience is that AWTListeners are notified first-registered-first-served, while listeners to swing specific events are notified last-registered-first-served. Below is a snippet (formulated in context of SwingX convenience classes, too lazy ...) showing that difference.
The latter probably stems from hefty c&p of notification by walking the EventListenerList: the earliest code was implemented very near the beginning of Swing when every little drop of assumed performance optimization was squeezed, such as walking from back to front. Using EventListenerList involves lots of code duplication ... so lazy devs as we all are, simply c&p'ed that loop and just changed the concrete event type and method name. More recently, as in the we-use-all-those-nifty-cool-language-features ;-) I've seen more usage of forEach loops (f.i. in beansbinding) so notification is back to first-in-first-served :-)
Bottom line: don't rely on any sequence - if needed, use an eventBus (or proxy or however it's called) and define the order there. Darryl's suggestion is as close as we can get in Swing (as it's not supported) but not entirely safe: there's no way to get notified when listeners are added/removed and no hook where to plug-in such a bus into the ui-delegate where it would belong.
Cheers
Jeanette
// output
02.10.2009 14:21:57 org.jdesktop.swingx.event.EventOrderCheck$1 mousePressed
INFO: first added mouseListener
02.10.2009 14:21:57 org.jdesktop.swingx.event.EventOrderCheck$2 mousePressed
INFO: second added mouseListener
02.10.2009 14:21:58 org.jdesktop.swingx.event.EventOrderCheck$4 valueChanged
INFO: second added listSelectionListener
02.10.2009 14:21:58 org.jdesktop.swingx.event.EventOrderCheck$3 valueChanged
INFO: first added listSelectionListener
// produced by
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.logging.Logger;
import javax.swing.JList;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import org.jdesktop.swingx.InteractiveTestCase;
import org.jdesktop.test.AncientSwingTeam;
public class EventOrderCheck extends InteractiveTestCase {
    public void interactiveOrderAWTEvent() {
        JList list = new JList(AncientSwingTeam.createNamedColorListModel());
        MouseListener first = new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                LOG.info("first added mouseListener");
        MouseListener second = new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                LOG.info("second added mouseListener");
        list.addMouseListener(first);
        list.addMouseListener(second);
        ListSelectionListener firstSelection = new ListSelectionListener() {
            @Override
            public void valueChanged(ListSelectionEvent e) {
                if (e.getValueIsAdjusting()) return;
                LOG.info("first added listSelectionListener");
        ListSelectionListener secondSelection = new ListSelectionListener() {
            @Override
            public void valueChanged(ListSelectionEvent e) {
                if (e.getValueIsAdjusting()) return;
                LOG.info("second added listSelectionListener");
        list.addListSelectionListener(firstSelection);
        list.addListSelectionListener(secondSelection);
        showWithScrollingInFrame(list, "event order");
    @SuppressWarnings("unused")
    private static final Logger LOG = Logger.getLogger(EventOrderCheck.class
            .getName());
    public static void main(String[] args) {
        EventOrderCheck test = new EventOrderCheck();
        try {
            test.runInteractiveTests();
        } catch (Exception e) {
            e.printStackTrace();
}

JTree, JList and file selection

I have a file selection JPanel that I'm creating that has a JTree on the left representing folders and a JList on the right that should have the files and folders listed to be able to select. I have two problems at this point. First, and more important, when a folder is selected, the JList doesn't update to the files in the new folder and I don't see what's keeping it from working. Second, when clicking on a folder in the JTree, it drops the folder to the end of the list and then lets you expand it to the other folders, also it shows the whole folder path instead of just the folder name.
This is still my first venture into JTrees and JLists and I'm still really new at JPanel and anything GUI, so my code may not make the most sense, but right now I'm just trying to get it to work.
Thank you.
public class FileSelection extends JFrame{
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Wow! I changed the FolderListPanel's mouseListener to:
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Interesting Focus II: JComboBox, 2 JLists and 1 Button

Hi All,
Another Interesting Keyboard Focus Question:
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Let's say we want to build a JComboBox whose popup contains 2 JLists and a button.
What we would probably want to do is:
comboBox.setUI(new MyComboBoxUI());
MyComboBoxUI will extend BasicComboBoxUI and
ovveride createPopup to return a BasicComboPopup subclass
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(One can argue that this is not a JComboBox anymore, but bare with me)
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This will work great with the Mouse, but with the Keyboard we face a problem:
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Possible solutions:
1.
Don't subclass BasicComboPopup and write a ComboPopup which uses a Focusable JWindow.
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2.
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of who is the current focused component
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If you haven't fell asleep by now, you are welcomed to share you ideas, Thanks
Eyal Katz

Sorry, I don't understand what you are trying to accomplish. However one line did catch my eye.
This is happening because the popup is not keyboard-focusable The code in the popupPopup() method in the following post might help:
http://forum.java.sun.com/thread.jspa?threadID=636842

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// Mattias

Yse I have read the tutorial. But I don't understand it.
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</pre>

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ENTER BACKLOG ENTRY
[Ljava.lang.String;@b1c260
PRINT
[Ljava.lang.String;@1dd46f7
ADD SCHOOL DATA
[Ljava.lang.String;@1b26af3
UPDATE SCHOOL DATA
[Ljava.lang.String;@eb017e
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hi all
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Edited by: Kavita_S on Apr 23, 2009 11:49 PM

Hi,
Do you know this link?
[How to Use Trees|http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html]
Please help me as soon as possible.Sorry that I'm not good at English, I don't understand what you mean.
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import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
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    //return selectedPath.contains(p);
    Object o =
          ((DefaultMutableTreeNode)p.getLastPathComponent()).getUserObject();
    return (o instanceof MyData)?((MyData)o).flag:false;
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
        createAndShowGUI();
public static void createAndShowGUI() {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    f.getContentPane().add(new TreePopupMenuTest3().makeUI());
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
}

JSplitPane, JScrollPane and JTree resizing

Hi,
In a JSplitPane, I have, in the left part, a JScrollPane, containing a JTree and, in the right part, I have an other panel.
When I click on different nodes in the JTree, the width of the left part changes, so the JSplitPane separator moves. How to avoid that ? I would prefer a scrolling move inside the JScrollPane !
I am using JDK 1.3
Thanks
Olivier Scalbert

Try to define the JScrollPane as
public JScrollPane(Component view, int vsbPolicy, int hsbPolicy)
Use vsbPolicy and hsbPolicy like the VERTICAL_SCROLLBAR_AS_NEEDED
HORIZONTAL_SCROLLBAR_AS_NEEDED respectively.
Then define the setPreferredSize to your JScrollPane. This preferredSize must be smaller than the size of the Component view if you want to see the ScrollBar.
By the way, when you define your JSplitPane have to define the setOneTouchExpandable(true);?

Vector and Jtree 4Duke

hi
i am having poblem with my jtree as i am not able to show the object in my vector as a different node
{each object is node of my tree}
unfortunately they all appear flat in the root, and in sequence{as one node} ??
i have done everything but still no answer??
thanks in advance for any solution
public class Gui extends JFrame
{ Vector root = new Vector();
public JTree theTree ;
public SERGui( )
System.out.println(root.size());//root vector is empty
roott = new DefaultMutableTreeNode (root);
model = new DefaultTreeModel (roott) ;
theTree = new JTree (model);
public Vector addOne(String newString)
if (!root.contains(getQuery))
           root.add(newString);
model.reload();
// //updateTree(); i also try this method whiich does not work
return root;
public void updateTree(){
DefaultMutableTreeNode v = (DefaultMutableTreeNode)theTree.getModel().getRoot();
for(int i=0;i<root.size();i++)
               DefaultMutableTreeNode node = (DefaultMutableTreeNode)root.elementAt(i);
               roott.add(node);
((DefaultTreeModel)theTree.getModel()).reload(v);
//DefaultMutableTreeNode node = null;
print_vector(root);
//root.clear();
     }and my other class
where i call this methos is as follow
Class Search()
public void countWord(String newString)
{Gui.addOne(newString);
}}

You are passing a Vector into the constructor of the DefaultMutableTreeNode to create the root of your tree. The DefaultMutableTreeNode will use this object's string representation (by calling toString on whatever object you pass in its constructor) as the name of the tree node. So basically you will see the entire contents of the vector as the name of your root node.
You need to traverse your vector, and use each element to create a DefaultMutableTreeNode and add it to your root node.
here is the modified code
public class Gui extends JFrame {
private Vector rootVector = new Vector();
private JTree theTree;
private DefaultMutableTreeNode rootNode;
private DefaultTreeModel model;
public Gui() {
System.out.println(rootVector.size());
//root vector is empty
rootNode = new DefaultMutableTreeNode("Root");
model = new DefaultTreeModel(rootNode);
theTree = new JTree(model);
public Vector addOne(String newString) {
if (!rootVector.contains(newString)) {
rootVector.add(newString);
updateTree();
return rootVector;
public void updateTree() {
rootNode.removeAllChildren();
for (int i = 0; i < rootVector.size(); i++) {
DefaultMutableTreeNode node = new DefaultMutableTreeNode(
rootVector.elementAt(i));
rootNode.add(node);
((DefaultTreeModel) theTree.getModel()).reload(rootNode);
Hemant Mahidhara

JSplitPane and Jtree

Hi all,
in my window I've got a JSplitPane with the left component that is a JScrollPane with a Jtree (used as a menu), while in the right side a customized JPanel that changes depending on the selection in the tree on the left.
My panels are initially created as follows:
     this.splitter = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
     this.splitter.setOneTouchExpandable(true);
JScrollPane leftPanel = new JScrollPane( this.menuTree );
          leftPanel.setMinimumSize( new Dimension(300,300) );
          leftPanel.setMaximumSize(leftPanel.getMinimumSize());
          // add the leftt and right panels
          this.splitter.setLeftComponent( leftPanel );
          this.imagePanel = new ImagePanel(ComponentBuilder.getLogoPath());
          this.rightPanel = this.imagePanel;
          this.splitter.setRightComponent(this.rightPanel);
          // add the splitter to myself
          this.add(new JScrollPane(this.splitter));where the imagepanel is a working panel that shows the project logo. Now what happens is that:
1) the logo is cutted to a size I don't know how is calculated, since the image panel is working fine (if I place on a separate window I can see the image right)
2) most important when a user selects something in the tree on the left panel, so the right panel changes, the left panel is moved around the window depending on the size of the right panel.
Is it possible to fix the left panel not only as size, but also in the position of the window, thus the remaining part of the window will be occupied by the right panel without moving the left one? In my frame I'm using a BorderLayout, and the panel containing the splitpane is set at the center (no components on the right and on the left).
Thanks,
Luca

Thanks for your reply, but the only thing I noticed is that the code you're showing works a little more with sizes, that is something I've already tried. By the way, the following is a running example that loads a tree/menu and the logo.png image.
Any idea about its behaviour?
Thanks,
Luca
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.util.*;
import java.awt.image.*;
class ImagePanel extends JPanel implements ImageObserver
     * The image to display
    protected Image image=null;
     * This flag indicates if the image is complete or not.
    protected boolean isComplete=false;
     * The dimension of the panel.
    protected int width=0,height=0;
     * This is the message to display during loading.
    protected String message="Loading...";
     * Default constructor.
     * @param image the image object.
    public ImagePanel(Image image)
          super();
          this.image=image;
     * Overloaded constructor. It try to load the image itself. You should use
     * this to avoid image flicking problems. This method use all the
     * capabilities of the ImageObserver.
     * @param image the image file name
    public ImagePanel(String image) {
          super();
          /* now load the image */
          Toolkit tk=Toolkit.getDefaultToolkit();
          this.image=tk.getImage(image);
          /* use the media tracker to wait untill the image is not loaded */
          try{
              MediaTracker tracker=new MediaTracker(this);
              tracker.addImage(this.image,0);
              tracker.waitForID(0);
              this.isComplete=true;
              /* now that the image is fully loaded I need to resize the panel to
              the size of the image */
              this.width=this.image.getWidth(this);
              this.height=this.image.getHeight(this);
              this.setSize(width,height);
              this.setMinimumSize(getSize());
              this.setMaximumSize(getSize());
              this.setVisible(true);
          catch(InterruptedException e){
              this.message="Exception during loading process!";
              this.isComplete=false;
     * Draw the image.
    public void paint(Graphics device)   {
          super.paint(device);
          if(this.isComplete==true)     {
              device.drawImage(this.image,0,0,this.width,this.height,this);
          else     {
              device.setColor(Color.RED);
              device.drawString(this.message,20,20);
     * The update image method. This method is called for every update and or
     * error.
    public boolean imageUpdate(Image image,int infoFlags, int x, int y,
                    int width, int height)
          if((infoFlags & ALLBITS)==0)
              /* the image is complete */
              this.isComplete=true;
              repaint();
              this.setVisible(true);
              return false;
          else
          if((infoFlags & ERROR)==0 || (infoFlags & ABORT)==0 )
              /* error or abort */
              this.isComplete=false;
              this.message="Error during load process (or abort)";
              this.repaint();
              return true;
          else
          if((infoFlags & SOMEBITS)==0)
              /* some other data loaded, show the loading process percent */
              int originalWidth=this.image.getWidth(this);
              int originalHeight=this.image.getHeight(this);
              int currentWidth=image.getWidth(this);
              int currentHeight=image.getHeight(this);
              /* now calculate the total of pixels */
              long originalTotal=originalWidth*originalHeight;
              long currentTotal=currentWidth*currentHeight;
              /* now calculate the percent */
              float percent=(float)currentTotal/(float)originalTotal *100;
              /* set the string */
              this.message="Loading progress: "+(int)percent+" % done";
              this.repaint();
              return true;
          return true;
public class MainPanel extends JPanel {
      * The split pane used for this panel.
     protected JSplitPane splitter = null;
      * The menu tree of this panel.
     protected JTree menuTree = null;
      * The parentFrame frame of this panel
     protected JFrame parentFrame = null;
      * The panel on the right of the window.
     protected JComponent rightPanel = null;
      * The menuTreeRoot node of the menu.
     protected DefaultMutableTreeNode menuTreeRoot = null;
      * The action menu of the JFrame that contains this panel. Such menu is changed depending on the panel
      * shown on the right panel.
     protected JMenu actionMenu = null;
      * The image panel with the image of the logo.
     protected ImagePanel imagePanel = null;
     public final String ROOT_STRING = "Gestione delle risorse umane";
     public final String LEVEL1A_STRING = "Parametrizzazione";
     public final String LEVEL2AA_STRING = "Competenze & Famiglie di competenze";
     public final String LEVEL2AB_STRING = "Gestione dei ruoli";
     public final String LEVEL2AC_STRING = "Associazione ruolo-competenza";
     public final String LEVEL1B_STRING   = "Varie";
     public final String LEVEL2BB_STRING = "Province";
     public final String LEVEL2BC_STRING = "Citta'";
     public final String LEVEL2BD_STRING = "Livelli di istruzione";
     public final String LEVEL2BE_STRING = "Livelli di competenza";
     public final String LEVEL3A_STRING   = "Personale";
     public final String LEVEL3AA_STRING = "Anagrafica di base";
     public final String LEVEL3AB_STRING = "Ruoli, Competenze e Gradi di Istruzione";
     public final String LEVEL3AC_STRING = "Storia delle valutazioni delle competenze";
     public final String LEVEL3AD_STRING = "Valutazione";
      * Default constructor.
      * @param parentFrame the jframe that contains this panel
     public MainPanel(JFrame parent, JMenu actionMenu){
          super();
          this.parentFrame = parent;
          this.initGUI();
          this.actionMenu = actionMenu;
      * Shows the components on the main panel.
     public synchronized void initGUI(){
          // create the split pane
          this.splitter = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
          this.splitter.setOneTouchExpandable(true);
          //this.splitter.setResizeWeight(0);                    // the right panel gets all the extra space
          // create the left panel with the tree
          DefaultMutableTreeNode root = new DefaultMutableTreeNode(ROOT_STRING);
               DefaultMutableTreeNode level1a = new DefaultMutableTreeNode(LEVEL1A_STRING);
                    ContainerTreeNode level2aa = new ContainerTreeNode(LEVEL2AA_STRING);     // skills and families
               DefaultMutableTreeNode level2ab = new DefaultMutableTreeNode(LEVEL2AB_STRING);
                    DefaultMutableTreeNode level2ac = new DefaultMutableTreeNode(LEVEL2AC_STRING);
               DefaultMutableTreeNode level1b = new DefaultMutableTreeNode(LEVEL1B_STRING);
                    DefaultMutableTreeNode level2bb = new DefaultMutableTreeNode(LEVEL2BB_STRING);
                    DefaultMutableTreeNode level2bc = new DefaultMutableTreeNode(LEVEL2BC_STRING);
                    DefaultMutableTreeNode level2bd = new DefaultMutableTreeNode(LEVEL2BD_STRING);
                    DefaultMutableTreeNode level2be = new DefaultMutableTreeNode(LEVEL2BE_STRING);
               DefaultMutableTreeNode level3a = new DefaultMutableTreeNode(LEVEL3A_STRING);
                    DefaultMutableTreeNode level3aa = new DefaultMutableTreeNode(LEVEL3AA_STRING);
                    DefaultMutableTreeNode level3ab = new DefaultMutableTreeNode(LEVEL3AB_STRING);
                    DefaultMutableTreeNode level3ac = new DefaultMutableTreeNode(LEVEL3AC_STRING);
                    DefaultMutableTreeNode level3ad = new DefaultMutableTreeNode(LEVEL3AD_STRING);
          // create the tree
          this.menuTreeRoot = root;
          level2ab.add(level2ac);
          level1a.add(level2aa);
          level1b.add(level2bc);
          level1b.add(level2bb);
          level1b.add(level2bd);
          level1b.add(level2be);
          level3a.add(level3aa);
          level3a.add(level3ab);
          level3a.add(level3ac);
          level3a.add(level3ad);
          root.add(level3a);
          root.add(level2ab);
          root.add(level1a);
          root.add(level1b);
          this.menuTree = new JTree(root);
          this.menuTree.setSize(200,200);
          JScrollPane leftPanel = new JScrollPane( this.menuTree );
          leftPanel.setMinimumSize( new Dimension(300,300) );     // it does not affects the dimension, but avoid to resize the left panel
          leftPanel.setMaximumSize(leftPanel.getMinimumSize());
          // add the leftt and right panels
          this.splitter.setLeftComponent( leftPanel );
          this.imagePanel = new ImagePanel("logo.png");
          this.rightPanel = this.imagePanel;
          this.rightPanel.setSize(400,400);
          this.splitter.setRightComponent(this.rightPanel);
          // add the splitter to myself
          this.add(new JScrollPane(this.splitter));
     public static void main(String argv[]){
         JFrame f = new JFrame();
         f.setSize(400,400);
         f.add(new MainPanel(f,null));
         f.setVisible(true);
}

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