home *** CD-ROM | disk | FTP | other *** search
Java Source | 2000-05-25 | 4.6 KB | 121 lines |
- //: Trees.java
- //////////////////////////////////////////////////
- // Copyright (c) Bruce Eckel, 1998
- // Source code file from the book "Thinking in Java"
- // All rights reserved EXCEPT as allowed by the
- // following statements: You can freely use this file
- // for your own work (personal or commercial),
- // including modifications and distribution in
- // executable form only. Permission is granted to use
- // this file in classroom situations, including its
- // use in presentation materials, as long as the book
- // "Thinking in Java" is cited as the source.
- // Except in classroom situations, you cannot copy
- // and distribute this code; instead, the sole
- // distribution point is http://www.BruceEckel.com
- // (and official mirror sites) where it is
- // freely available. You cannot remove this
- // copyright and notice. You cannot distribute
- // modified versions of the source code in this
- // package. You cannot use this file in printed
- // media without the express permission of the
- // author. Bruce Eckel makes no representation about
- // the suitability of this software for any purpose.
- // It is provided "as is" without express or implied
- // warranty of any kind, including any implied
- // warranty of merchantability, fitness for a
- // particular purpose or non-infringement. The entire
- // risk as to the quality and performance of the
- // software is with you. Bruce Eckel and the
- // publisher shall not be liable for any damages
- // suffered by you or any third party as a result of
- // using or distributing software. In no event will
- // Bruce Eckel or the publisher be liable for any
- // lost revenue, profit, or data, or for direct,
- // indirect, special, consequential, incidental, or
- // punitive damages, however caused and regardless of
- // the theory of liability, arising out of the use of
- // or inability to use software, even if Bruce Eckel
- // and the publisher have been advised of the
- // possibility of such damages. Should the software
- // prove defective, you assume the cost of all
- // necessary servicing, repair, or correction. If you
- // think you've found an error, please email all
- // modified files with clearly commented changes to:
- // Bruce@EckelObjects.com. (Please use the same
- // address for non-code errors found in the book.)
- /////////////////////////////////////////////////
-
- // Simple Swing tree example. Trees can be made
- // vastly more complex than this.
- package c13.swing;
- import java.awt.*;
- import java.awt.event.*;
- import java.awt.swing.*;
- import java.awt.swing.tree.*;
-
- // Takes an array of Strings and makes the first
- // element a node and the rest leaves:
- class Branch {
- DefaultMutableTreeNode r;
- public Branch(String[] data) {
- r = new DefaultMutableTreeNode(data[0]);
- for(int i = 1; i < data.length; i++)
- r.add(new DefaultMutableTreeNode(data[i]));
- }
- public DefaultMutableTreeNode node() {
- return r;
- }
- }
-
- public class Trees extends JPanel {
- String[][] data = {
- { "Colors", "Red", "Blue", "Green" },
- { "Flavors", "Tart", "Sweet", "Bland" },
- { "Length", "Short", "Medium", "Long" },
- { "Volume", "High", "Medium", "Low" },
- { "Temperature", "High", "Medium", "Low" },
- { "Intensity", "High", "Medium", "Low" },
- };
- static int i = 0;
- DefaultMutableTreeNode root, child, chosen;
- JTree tree;
- DefaultTreeModel model;
- public Trees() {
- setLayout(new BorderLayout());
- root = new DefaultMutableTreeNode("root");
- tree = new JTree(root);
- // Add it and make it take care of scrolling:
- add(new JScrollPane(tree),
- BorderLayout.CENTER);
- // Capture the tree's model:
- model =(DefaultTreeModel)tree.getModel();
- JButton test = new JButton("Press me");
- test.addActionListener(new ActionListener() {
- public void actionPerformed(ActionEvent e){
- if(i < data.length) {
- child = new Branch(data[i++]).node();
- // What's the last one you clicked?
- chosen = (DefaultMutableTreeNode)
- tree.getLastSelectedPathComponent();
- if(chosen == null) chosen = root;
- // The model will create the
- // appropriate event. In response, the
- // tree will update itself:
- model.insertNodeInto(child, chosen, 0);
- // This puts the new node on the
- // currently chosen node.
- }
- }
- });
- // Change the button's colors:
- test.setBackground(Color.blue);
- test.setForeground(Color.white);
- JPanel p = new JPanel();
- p.add(test);
- add(p, BorderLayout.SOUTH);
- }
- public static void main(String args[]) {
- Show.inFrame(new Trees(),200,500);
- }
- } ///:~