JTree - Trying to make selection a parent select all children
I have a jtree with checkboxes and titles. This is my first semester working with java, I started out in cpp so I'm pretty new to GUIs. I found an example of a Jtree with checkboxes on the leaf nodes online and was able to modify it to have checkboxes on all nodes.
I have been reading through example code of JTrees but have not been able to figure out how to modify children when a parent is modified. If I clicked on an expandable node with sub nodes, I'd want all checkboxes under it to become checked. I've been trying to figure this out for a few days now.
I tried adding a System.out to the getTreeCellEditorComponent class of the cell editor, to see if that's where I'm supposed to put the code (when i figure out what it is) but it gave unexpected output. Clicking a checkbox the first time called the println once, but after that, each click called println multiple times per click. I'm worried that having the extra calls to the code could mess things up. Where would I want to put code for it to be called only once per time the checkbox is clicked?
Oh, I also tried adding a listener to the checkbox in the renderer but it gave really weird results too.
How does the TreePath class work? I tried some stuff with getClosestPathForLocation but couldn't get anything to work.
Thank you very much for your time and help.
Thanks for pointing that out. I had tried a few others but yes his was very close to what I want. I just removed the node icons.
Thanks
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Dear friends:
I have Two Panels, PA and PB,
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package com.atest;
import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Enumeration;
import java.awt.Dimension;
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import javax.swing.JPanel;
import javax.swing.JScrollPane;
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import javax.swing.JTree;
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import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
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protected DefaultMutableTreeNode selectedNode = null;
protected final JTree tree;
protected final JTextField jtf;
protected Enumeration vEnum = null;
private TreeModel m;
protected DefaultMutableTreeNode getDefaultMutableTreeNode() {
//textArea.getText();
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protected DefaultMutableTreeNode setDefaultMutableTreeNode(DefaultMutableTreeNode tt) {
//textArea.getText();
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protected TreeModel getJTModel() {
//textArea.getText();
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protected TreeModel setJTModel(TreeModel ta) {
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b.add(b2);
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c.add(c3);
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c.add(c4);
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c.add(c5);
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frame.getContentPane().add(new DefaultMutableTreeMain());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 400);
frame.setVisible(true);
}[2]. PB Panel code
package com.atest;
import java.awt.BorderLayout;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.JPanel;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.*;
import javax.swing.JButton;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
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private JButton removeButton;
private JButton addButton;
JTree tree;
private TreeModel m;
protected TreeDragSource ds;
protected TreeDropTarget dt;
protected TreeModel getJTModel() {
//textArea.getText();
return m;
protected TreeModel setJTModel(TreeModel ta) {
m = ta;
return m;
protected DefaultTreeModel model;
protected DefaultMutableTreeNode rootNode;
DefaultMutableTreeMain dmm = null;
JPanel inputPanel = new JPanel();
public JPanel SLTreeDNDEditableDynamic(DefaultMutableTreeMain tdnd ) {
//super("Rearrangeable Tree");
setSize(400,450);
dmm = tdnd;
setLayout(new BorderLayout());
inputPanel.setLayout(new BorderLayout());
JPanel outputPanel = new JPanel();
System.out.println("Sub selectedNode tdnd= " + tdnd);
tdnd.tree.addTreeSelectionListener(new TreeSelectionListener(){
public void valueChanged(TreeSelectionEvent evt){
TreePath[] paths = evt.getPaths();
TreePath path = dmm.tree.getSelectionPath();
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)path.getLastPathComponent();
DefaultMutableTreeNode itemNode = dmm.getDefaultMutableTreeNode();
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model = new DefaultTreeModel(itemNode);
tree = new JTree(model);
System.out.println("Sub selectedNode paths= " + paths);
System.out.println("Sub selectedNode path= " + path);
System.out.println("Sub selectedNode = " + selectedNode);
System.out.println("Sub itemNode = " + itemNode);
tree.putClientProperty("JTree.lineStyle", "Angled");
tree.setRootVisible(true);
inputPanel.add(new JScrollPane(tree),BorderLayout.CENTER);
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public DefaultMutableTreeSub() {
super();
}thanks
sunnyThanks so much, I use your code and import followig:
import java.util.ArrayList;
import java.awt.List;
but
private static List<Object> getChildNodes(JTree j) {
Object parent = j.getLastSelectedPathComponent();
int childNodeCount = j.getModel().getChildCount(parent);
List<Object> results = new ArrayList()<Object>;
for (i = 0; i < childNodeCount; i++) {
results.add(parent, i);
return results;
here List<Object> and ArrayList()<Object> show red,
Is my JDK version problem??
my one is JKD
C:\temp\swing>java -version
java version "1.4.2_08"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_08-b03)
Java HotSpot(TM) Client VM (build 1.4.2_08-b03, mixed mode)
Error as follows:
C:\temp\swing>javac DefaultMutableTreeSub.java
DefaultMutableTreeSub.java:38: <identifier> expected
private static List<Object> getChildNodes(JTree j) {
^
1 error
any idea??
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