JTree difficulties

Hi,
I wish to generate a popup for multiple nodes selected on a JTree. I need to query the nodes user objects to decide on the contents of the popup. How can I get the user objects of the selected nodes when the selection methods simply return TreePaths??
Also, I have installed a custom editor for my nodes. It is a Box container that contains a JLabel and a JTextField. Here is the code:
public Component getTreeCellEditorComponent(JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row) {
ce.setText(getUserObject().toString());
if (isSelected) {
ce.setOpaque(true);
treeLabel.setOpaque(true);
} else {
ce.setOpaque(false);
treeLabel.setOpaque(false);
treeLabel.setText(makePresetName(preset, ""));
treeLabel.setIcon(getIcon());
treeLabel.setToolTipText(getToolTipText());
Box box = Box.createHorizontalBox();
box.add(treeLabel);
box.add(ce);
return box;
Problem is the JLabel(with its icon) never gets shown, just the JTextField component.
What could be happening here??
-Paul.

((DefaultMutableTreeNode)selectedTreePath.getLastPathComponent()).getUserObject()Sven

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JTree editing difficulties

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import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
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import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.WindowEvent;
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import javax.swing.border.BevelBorder;
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import javax.swing.event.*;
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gBC.gridy = 0;
add(jPanelFulContainerTop, gBC);
jPanelFulContainerBottom = new PanelFulContainerBottom();
gBC.gridx = 0;
gBC.gridy = 2;
add(jPanelFulContainerBottom, gBC);
class PanelFulContainerTop extends JPanel {
PanelToShowTrees panelToShowTrees;
public PanelFulContainerTop() { // costruttore
this.setMinimumSize(dimMinArcPanels);
this.setPreferredSize(dimPrefArcPanels);
setLayout(new FlowLayout());
panelToShowTrees = new PanelToShowTrees();
add(panelToShowTrees);
}// costruttore
class PanelFulContainerBottom extends JPanel {
JButton but1 = new JButton("load string1");
JButton but2 = new JButton("load string2");
String[] str1 = {"0-AAA", "0-BBBBBB", "2-CCCCC", "2-DDDDDD", "2-EEEEEEE", "5-FFFFFF", "5-GGGGGG", "5-HHHHHH", "7-IIIIII", "7-KKKKKKK", "7-LLLLLL", "7-MMMMMM"};
String[] str2 = {"0-aaaaa", "0-bbbbb", "0-cccc", "2-ddddd", "2-eeee", "3-ffffff", "3-gggggg", "3-hhhhh", "4-iiiiii", "4-kkkkk", "7-lllllll", "7-mmmmm", "7-nnnnn"};
public PanelFulContainerBottom() {// costruttore
this.setMinimumSize(dimMinArcPanels);
this.setPreferredSize(dimPrefArcPanels);
add(but1);
but1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
fillTrees(str1);
add(but2);
but2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
fillTrees(str2);
class PanelToShowTrees extends JPanel {
JScrollPane jScrollPane[];
JTree jTree[];
DefaultMutableTreeNode[] root_Node;
public PanelToShowTrees() {
this.setMinimumSize(dimMinSemiArcPanels);
this.setPreferredSize(dimPrefSemiArcPanels);
setLayout(new FlowLayout());
jScrollPane = new JScrollPane[8];
jTree = new JTree[8];
root_Node = new DefaultMutableTreeNode[8];
for (int i = 0; i < 8; i++) {
root_Node[i] = new DefaultMutableTreeNode(" " + (8 - i));
jTree[i] = new JTree(root_Node[i]);
jScrollPane[i] = new JScrollPane();
jScrollPane[i].setViewportView(jTree[i]);
add(jScrollPane[i]);
jScrollPane[i].setPreferredSize(treePrefDim);
jScrollPane[i].setMinimumSize(treeMinDim);
jTree[i].addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent e) {
showContentOfTheTree(e);
private void showContentOfTheTree(TreeSelectionEvent e) {
String stringaGotFromEvent = e.getPath().toString();
JOptionPane.showMessageDialog(rootPane, "found =---> " + stringaGotFromEvent);

hi Andre,
thank you for answering me.
I have not much practice with JTrees so I find some difficulty to use it...
After I got your advice, I made changed a little the design of my program..
This it is a program for management of a dentist office, and I would show in 8 JTrees (every jTree root represents the teeth in a dental arch) the treatments that each tooth got.
How I said, the 8 JTree roots are representing the teeth, and in this architecture the problem is:
- to add a node to a tree root to indicate a treatment for that tooth;
- to delete all the children from a jTree root before beginning to add new child, before writing again treatments, when the informations are changed.
Following your help, I made this two functions to reach this purpose:
private void assingTreatmentToTooth(int toothNmbr, String strTreatment) {
        DefaultMutableTreeNode newChild = new DefaultMutableTreeNode(strTreatment); // new treatment to add
        DefaultTreeModel model = (DefaultTreeModel) panel_trees.jTreeXdentalRoots[toothNmbr].getModel(); // get model for the root Tree
        DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) model.getRoot();
        model.insertNodeInto(newChild, parentNode, 0); // always assign 0 as first node
    } // assingTreatmentToTooth()
private void removeTreatmentFromAtooth(int toothNmbr, int childNmbr) {
        DefaultTreeModel model = (DefaultTreeModel) panel_trees.jTreeXdentalRoots[toothNmbr].getModel(); // get model for the root Tree
        DefaultMutableTreeNode child = (DefaultMutableTreeNode) model.getChild(model, childNmbr);
        model.removeNodeFromParent(child);
    } // removeTreatmentToTooth()when the second function is executed, I get this error:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.tree.DefaultTreeModel cannot be cast to javax.swing.tree.TreeNode
at the line : DefaultMutableTreeNode child = (DefaultMutableTreeNode) model.getChild(model, childNmbr);
DefaultMutableTreeNode child = (DefaultMutableTreeNode) model.getChild(model, childNmbr);
could you tell me what is wrong ?
regards
TonyMrsangelo

Does setSelectionPath() method of JTree calls the treeValueChanged() method

Hello,
Just wanted to know whether setSelectionPath() method of JTree calls the treeValueChanged() method after selecting the path?
Thanks.

Hi SaucyMexican,
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Regards,
Jeff D.

DnD from JTree to JTable

Hi guys,
It seems JTree DnD support is a quit difficult feature to implement of all swing components.
I'm writing an application in which I have a JTree structure representing the file system of user machine and another JTable component at the right.
I want to be able to drag files nodes from left JTree to right JTable.
I would appreciate a lot if someone share with me some source code examples for this functionality.
can someone post some basic java code to get me started or point me to some web resource discussing this feature?
thanks much.

http://forum.java.sun.com/thread.jspa?threadID=296255Thank you. I already looked at this thread but it's not what i'm looking for: it shows dnd from a JTree to another JTree..however i need to implement dnd from JTree to JTable.
Is there some basic example on how to do that ?
thanks.

Drag n Drop in JTree - missing the visual effect

Hi,
I already implemented the D&D on Jtree (from a JList)
I've implemented DropTargetListener and it works
I've the visual effect of the Dragged object on the mouse
I have an extended DefaultTreeCellRenderer witch I use for other things.
My problem is how do I get the visual effect of the active tree nodes when I drag it over them ?
thanks,
Allen

Drag and drop is not something you can just turn on and off im afraid. You have 2 choices:
1. if the dragging and dropping only occurs over a single component such as your tree, you could probably make a simplified on with mouse [motion?] listeners. On a mouse drag it could check which node was under the drag point and keep that in a variable. On a mouse release it could look to see if theres a node there and if so make it a child of that node.
2. Implement full drag and drop, subclassing the JTree and having both a DragSource and DropTarget assigned to it. Theres a load of interfaces to implement but its not too difficult. Youll also need to make a DataFlavor class to contain the node values. Its the more involved solution but would probably be better in the long run.
DS

Updating JTree from Vector

Hello,
i'm using a JTree and buildings its Tree from a Vector.
Vector root = new Vector();
Vector child1 = new Vector();
Vector child2 = new Vector();
child1.add(new String("Test1"));
child1.add(new String("Test12"));
child2.add(new String("Child2"));
root.add(child1);
root.add(child2);
JTree myTree = new JTree(root);
Now i have the problem that Item Test1 from child1 is changig to child2. Doing this at the vector level is not difficult, but how can i get the JTree taking this changes?

JTree will lie dormant until it receives a nodesWereChanged, nodesWereDeleted or whatever event. This comes from the tree model. You will need to alert the tree's model that you have changed a node or two. Read the documentation.

Strange Jtree behaviour

I have a very strange behavior using a jtree.
This tree has a structure like this:
A
|.\
B.C
|....\
E...E
|......\
F.....F
|........\
G.......G
Notice that equals letters are referred to the same viewobject row,
I begin opening the tree from the root, when I open both 'E' nodes, some strange things happens,
for example when I open 'G' all the right branch collapses, then if I open 'G' on the left, all the Jtree
is automatically closed, even more when I re-open node 'E' (on the right) , also the left branch is
automatically opened.
I don't know what's the problem.
Can anyone help me ?
Thanks
Massimo Marolda

You're not the only one. I'm having difficulties with my JTree's as well (the ones with a JClient binding anyway). I'm keeping my fingers crossed that the new JDev/BC4J 9.0.4 will address these issues.

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