Lleta Tree Utilities - Example Applet

This simple example uses the JazzTreePresenter class to display a hand-built tree. Unfortunately, I can't demonstrate the reflective tree creation features, as this requires a java security permission (accessDeclaredMethod) that webbrowsers deny. To use this applet, click inside the applet frame and use the following keys to navigate the tree:

up - select the previous sibling
down - select the next sibling
left - go back
right - go forward
z - toggle the zoom mode (zoom selected or zoom siblings)
mouse -- try dragging with the left and right mouse buttons

Source Code

package org.lleta.tests;
import org.lleta.utilities.*;
import org.lleta.utilities.trees.*;
import org.lleta.utilities.trees.reflective.*;
import edu.umd.cs.jazz.*;
import edu.umd.cs.jazz.util.*;
import edu.umd.cs.jazz.event.*;
import edu.umd.cs.jazz.component.*;
import javax.swing.*;

public class TreeTestApplet2 extends JApplet {

     public void init() {

          // initialize the applet and create a Jazz canvas
          setBackground(null);
          setVisible(true);
          ZCanvas canvas = new ZCanvas();
          getContentPane().add(canvas);

          // create a dummy tree structure
          Node root = new Node("root");

               Node childa = new Node("this is child a");
               root.addChild(childa);

                    Node childa1 = new Node("a1");
                    childa.addChild(childa1);

                    Node childa2 = new Node("a2");
                    childa.addChild(childa2);

               Node childb = new Node("this is child b");
               root.addChild(childb);

               Node childc = new Node("this is child c");
               root.addChild(childc);

                    Node childc1 = new Node("c1");
                    childc.addChild(childc1);

                    Node childc2 = new Node("c2");
                    childc.addChild(childc2);

                    Node childc3 = new Node(new Integer(4));
                    childc.addChild(childc3);

          // create a new jazz tree presenter on the provided canvas
          // and make it respond to key events
          JazzTreePresenter jtp = new JazzTreePresenter(root, canvas);
          this.addKeyListener(jtp.new KeyListener());
          this.validate();
     }
}