Name: pa48320 Date: 12/04/2001


Using the following testcase tab into the JTree and then use the up
and down arrows to navigate to different items. Notice that the JTree
is firing active descendant events that are incorrect. The event
that is currently being sent is always sending the last node as the
new node instead of the correct new node.

import javax.accessibility.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.text.*;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.tree.*;

public class TreeTest extends JPanel implements PropertyChangeListener
{
    public static void main(String[] args)
    {
         TreeTest p = new TreeTest();
         JFrame f = new JFrame("Test JTree Accessibilty");
         f.getContentPane().setLayout(new BorderLayout());
         f.getContentPane().add(BorderLayout.NORTH, p);
         f.pack();
         f.setVisible(true);
    }

    public TreeTest() {
  setLayout(new BorderLayout());

        DefaultMutableTreeNode top = new DefaultMutableTreeNode("Music");
        DefaultMutableTreeNode catagory;
  DefaultMutableTreeNode composer;
  DefaultMutableTreeNode style;
  DefaultMutableTreeNode album;

  // Classical
  catagory = new DefaultMutableTreeNode("Classical");
  top.add(catagory);

  // Beethoven
  catagory.add(composer = new DefaultMutableTreeNode("Beethoven"));
  // Brahms
  catagory.add(composer = new DefaultMutableTreeNode("Brahms"));

  // Mozart
  catagory.add(composer = new DefaultMutableTreeNode("Mozart"));
  catagory.add(composer = new DefaultMutableTreeNode("Schubert"));

  // Jazz
  top.add(catagory = new DefaultMutableTreeNode("Jazz"));

  // Ayler
  catagory.add(composer = new DefaultMutableTreeNode("Albert Ayler"));

  // Chet Baker
  catagory.add(composer = new DefaultMutableTreeNode("Chet Baker"));

  // Coltran
  catagory.add(composer = new DefaultMutableTreeNode("John Coltrane"));

  // Miles
  catagory.add(composer = new DefaultMutableTreeNode("Miles Davis"));

  // Rock
  top.add(catagory = new DefaultMutableTreeNode("Rock"));

  // The Beatles
  catagory.add(composer = new DefaultMutableTreeNode("The Beatles"));
  // Crowded House
  catagory.add(composer = new DefaultMutableTreeNode("Crowded House"));

  // Harvin Garvel
  catagory.add(composer = new DefaultMutableTreeNode("Harvin Garvel"));

  // The Steve Miller Band
  catagory.add(composer = new DefaultMutableTreeNode("Steve Miller Band"));
  JTree tree = new JTree(top);
  add(new JScrollPane(tree), BorderLayout.CENTER);

  tree.getAccessibleContext().addPropertyChangeListener(this);
    }

  public void propertyChange(PropertyChangeEvent e)
  {
    String name = e.getPropertyName();
    if (AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY.equals(name))
    {
        System.out.println("active descendant changed");

     AccessibleContext oldAC = (AccessibleContext)e.getOldValue();
     String old = (oldAC == null) ? null : oldAC.getAccessibleName();
     System.out.println("old descendant is " + old);

     AccessibleContext ac = (AccessibleContext)e.getNewValue();
     System.out.println("new descendant is " + ac.getAccessibleName());
    }
  }
}
(Review ID: 136689)
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