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JAVA JTree Icon node

The following code adds icons on JTree node. Each node could have different icon. This example has four files: IconNodeTreeExample.java,IconNodeRenderer.java,IconNode.java and TextIcons.java

/*Example modified from http://www.crionics.com/products/opensource/faq/swing_ex/JTableExamples2.html
*/

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

public class IconNodeTreeExample extends JFrame {
public IconNodeTreeExample() {
super("IconNode TreeExample");

String[] strs = {"swing home", // 0
"platf", // 1
"basic.txt", // 2
"metal.c", // 3
"metal.java", // 4
"metal.html", // 5
"Computer", // 6
"A:", // 7
"C:", // 8
"D:"}; // 9

IconNode[] nodes = new IconNode[strs.length];
for (int i=0;i<strs.length;i++)
nodes[i] = new IconNode(strs[i]);
nodes[0].add(nodes[1]);
for (int i=2;i<=5;i++) nodes[1].add(nodes[i]);
nodes[0].add(nodes[6]);
for (int i=7;i<=9;i++) nodes[6].add(nodes[i]);

//
// set Icon directly
//
nodes[0].setIcon(MetalIconFactory.getFileChooserHomeFolderIcon());

//
// use JTree default Icon
//
// nodes[1]
// nodes[2]

//
// set Icon by user Object
//
// nodes[3]
// nodes[4]
// nodes[5]

//
// set Icon by name
//
nodes[6].setIconName("computer");
nodes[7].setIconName("floppyDrive");
nodes[8].setIconName("hardDrive");
nodes[9].setIconName("hardDrive");

JTree tree = new JTree( nodes[0] );
tree.putClientProperty("JTree.icons", makeIcons());
tree.setCellRenderer(new IconNodeRenderer());
JScrollPane sp = new JScrollPane(tree);
getContentPane().add(sp, BorderLayout.CENTER);
}

private Hashtable makeIcons() {
Hashtable icons = new Hashtable();
icons.put("floppyDrive",MetalIconFactory.getTreeFloppyDriveIcon());
icons.put("hardDrive" ,MetalIconFactory.getTreeHardDriveIcon());
icons.put("computer" ,MetalIconFactory.getTreeComputerIcon());
icons.put("c" ,TextIcons.getIcon("c"));
icons.put("java" ,TextIcons.getIcon("java"));
icons.put("html" ,TextIcons.getIcon("html"));
return icons;
}

public static void main(String args[]) {
IconNodeTreeExample frame = new IconNodeTreeExample();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
frame.setSize(300, 150);
frame.setVisible(true);
}
}

 


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Best books about JAVA programming from Amazon
Professional Java, JDK 5 Edition (Paperback Simply Java Programming: An Application-Driven Tutorial Approach (Paperback) Effective Java Programming Language Guide (Paperback) Head First Java, 2nd Edition (Paperback) Java : An Introduction to Problem Solving and Programming (4th Edition)

 

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