How to make a Jtree expandable
Hi have a JTree and when I expand the tree and catch an exption hence not adding any children I would like the node that I have expanded to autamatically be collapsed, and ready for a future expand, as I have a situation were a node in the tree might not yet have any children (the children will be added dynamically).
I would like to handel the 9iexeption in such a way that the tree is ready for use and has the "+ sign available" to the user,
at the moomemt it thincks there are no chldren and has no "+ " or "-" sign so no future expand is posible
please help !!!!
hentchocan wrote:
I want to make a JTree that has a TextArea nodes. So each child when expanded shows a text area containing some information . Can any one provide example of such behaviour .
Best Regards,Here the reply button works.
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import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import javax.swing.table.*;
import java.awt.event.*;
import java.util.EventObject;
* This example shows how to create a simple JTreeTable component,
* by using a JTree as a renderer (and editor) for the cells in a
* particular column in the JTable.
* @version 1.2 10/27/98
* @author Philip Milne
* @author Scott Violet
public class JTreeTable extends JTable {
/** A subclass of JTree. */
protected TreeTableCellRenderer tree;
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super();
// Creates the tree. It will be used as a renderer and editor.
tree = new TreeTableCellRenderer(treeTableModel);
// Installs a tableModel representing the visible rows in the tree.
super.setModel(new TreeTableModelAdapter(treeTableModel, tree));
// Forces the JTable and JTree to share their row selection models.
ListToTreeSelectionModelWrapper selectionWrapper = new
ListToTreeSelectionModelWrapper();
tree.setSelectionModel(selectionWrapper);
setSelectionModel(selectionWrapper.getListSelectionModel());
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setDefaultRenderer(TreeTableModel.class, tree);
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super.updateUI();
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* Workaround for BasicTableUI anomaly. Make sure the UI never tries to
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public int getEditingRow() {
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editingRow;
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super.sizeColumnsToFit(resizingColumn);
if (getEditingColumn() != -1 && getColumnClass(editingColumn) ==
TreeTableModel.class) {
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getEditingColumn(), false);
Component component = getEditorComponent();
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component.validate();
* Overridden to pass the new rowHeight to the tree.
public void setRowHeight(int rowHeight) {
super.setRowHeight(rowHeight);
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* Overridden to invoke repaint for the particular location if
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protected int visibleRow;
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protected void updateSelectedPathsFromSelectedRows() {
if(!updatingListSelectionModel) {
updatingListSelectionModel = true;
try {
// This is way expensive, ListSelectionModel needs an
// enumerator for iterating.
int min = listSelectionModel.getMinSelectionIndex();
int max = listSelectionModel.getMaxSelectionIndex();
clearSelection();
if(min != -1 && max != -1) {
for(int counter = min; counter <= max; counter++) {
if(listSelectionModel.isSelectedIndex(counter)) {
TreePath selPath = tree.getPathForRow
(counter);
if(selPath != null) {
addSelectionPath(selPath);
finally {
updatingListSelectionModel = false;
* Class responsible for calling updateSelectedPathsFromSelectedRows
* when the selection of the list changse.
class ListSelectionHandler implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
updateSelectedPathsFromSelectedRows();
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