//JTreeEvent Swing Demo
//ipds 5/2001

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

public class JTreeEvent extends JApplet {
  JTree tree;
  JTextField jtf;

  public void init() {

    // Get content pane
    Container contentPane = getContentPane();

    // Set layout manager
    contentPane.setLayout(new BorderLayout());

    // Create top node of tree
    DefaultMutableTreeNode top = new DefaultMutableTreeNode("Options");

    // Create subtree of "A"
    DefaultMutableTreeNode a = new DefaultMutableTreeNode("A");
    top.add(a);
    DefaultMutableTreeNode a1 = new DefaultMutableTreeNode("A1");
    a.add(a1);
    DefaultMutableTreeNode a2 = new DefaultMutableTreeNode("A2");
    a.add(a2);

    // Create subtree of "B"
    DefaultMutableTreeNode b = new DefaultMutableTreeNode("B");
    top.add(b);
    DefaultMutableTreeNode b1 = new DefaultMutableTreeNode("B1");
    b.add(b1);
    DefaultMutableTreeNode b2 = new DefaultMutableTreeNode("B2");
    b.add(b2);
    DefaultMutableTreeNode b3 = new DefaultMutableTreeNode("B3");
    b.add(b3);

    // Create tree
    tree = new JTree(top);

    // Add tree to a scroll pane
    int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
    int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
    JScrollPane jsp = new JScrollPane(tree, v, h);

    // Add scroll pane to the content pane
    contentPane.add(jsp, BorderLayout.CENTER);

    // Add text field to applet
    jtf = new JTextField("", 20);
    contentPane.add(jtf, BorderLayout.SOUTH);

    // Anonymous inner class to handle mouse clicks
    tree.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent me) {
        doMouseClicked(me);
      }
    });
  }

  void doMouseClicked(MouseEvent me) {
    TreePath tp = tree.getPathForLocation(me.getX(), me.getY());
    if(tp != null)
      jtf.setText(tp.toString());
    else
      jtf.setText("");
  }
}