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Trees.java
No Java 2 support for APPLET!!
//: c13:Trees.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Simple Swing tree example. Trees can
// be made vastly more complex than this.
// <applet code=Trees
// width=250 height=250></applet>
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.tree.*;
import com.bruceeckel.swing.*;
// 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 JApplet {
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 void init() {
Container cp = getContentPane();
root = new DefaultMutableTreeNode("root");
tree = new JTree(root);
// Add it and make it take care of scrolling:
cp.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);
cp.add(p, BorderLayout.SOUTH);
}
public static void main(String[] args) {
Console.run(new Trees(), 250, 250);
}
} ///:~