A fancy example of JComboBox with a custom renderer and editor : ComboBox « Swing JFC « Java

A fancy example of JComboBox with a custom renderer and editor

A fancy example of JComboBox with a custom renderer and editor
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
// EditableComboBox.java
//A fancy example of JComboBox with a custom renderer and editor used to
//display a list of JLabel objects that include both text and icons.

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;

import javax.swing.ComboBoxEditor;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.BevelBorder;

public class EditableComboBox extends JPanel {

  private BookEntry books[] = {
      new BookEntry("Ant: The Definitive Guide", "covers/ant.gif"),
      new BookEntry("Database Programming with JDBC and Java",
      new BookEntry("Developing Java Beans", "covers/beans.gif"),
      new BookEntry("Developing JSP Custom Tag Libraries",
      new BookEntry("Java 2D Graphics", "covers/java2d.gif"),
      new BookEntry("Java and XML", "covers/jxml.gif"),
      new BookEntry("Java and XSLT", "covers/jxslt.gif"),
      new BookEntry("Java and SOAP", "covers/jsoap.gif"),
      new BookEntry("Java and XML Data Binding", "covers/jxmldb.gif"),
      new BookEntry("Java Cookbook", "covers/jcook.gif"),
      new BookEntry("Java Cryptography", "covers/jcrypto.gif"),
      new BookEntry("Java Distributed Computing", "covers/jdist.gif"),
      new BookEntry("Java I/O", "covers/javaio.gif"),
      new BookEntry("Java in a Nutshell", "covers/javanut.gif"),
      new BookEntry("Java Management Extensions", "covers/jmx.gif"),
      new BookEntry("Java Message Service", "covers/jms.gif"),
      new BookEntry("Java Network Programming", "covers/jnetp.gif"),
      new BookEntry("Java Performance Tuning", "covers/jperf.gif"),
      new BookEntry("Java RMI", "covers/jrmi.gif"),
      new BookEntry("Java Security", "covers/jsec.gif"),
      new BookEntry("JavaServer Pages", "covers/jsp.gif"),
      new BookEntry("Java Servlet Programming", "covers/servlet.gif"),
      new BookEntry("Java Swing", "covers/swing.gif"),
      new BookEntry("Java Threads", "covers/jthread.gif"),
      new BookEntry("Java Web Services", "covers/jws.gif"),
      new BookEntry("Learning Java", "covers/learnj.gif") };

  Map bookMap = new HashMap();

  public EditableComboBox() {
    // Build a mapping from book titles to their entries
    for (int i = 0; i < books.length; i++) {
      bookMap.put(books[i].getTitle(), books[i]);

    setLayout(new BorderLayout());

    JComboBox bookCombo = new JComboBox(books);
    bookCombo.setEditor(new ComboBoxEditorExample(bookMap, books[0]));
    bookCombo.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        System.out.println("You chose "
            + ((JComboBox) e.getSource()).getSelectedItem() + "!");
    add(bookCombo, BorderLayout.CENTER);

  public static void main(String s[]) {
    JFrame frame = new JFrame("Combo Box Example");
    frame.setContentPane(new EditableComboBox());

class BookEntry {
  private final String title;

  private final String imagePath;

  private ImageIcon image;

  public BookEntry(String title, String imagePath) {
    this.title = title;
    this.imagePath = imagePath;

  public String getTitle() {
    return title;

  public ImageIcon getImage() {
    if (image == null) {
      image = new ImageIcon(imagePath);
    return image;

  // Override standard toString method to give a useful result
  public String toString() {
    return title;

class ComboBoxEditorExample implements ComboBoxEditor {
  Map map;

  ImagePanel panel;

  ImageIcon questionIcon;

  public ComboBoxEditorExample(Map m, BookEntry defaultChoice) {
    map = m;
    panel = new ImagePanel(defaultChoice);
    questionIcon = new ImageIcon("question.gif");

  public void setItem(Object anObject) {
    if (anObject != null) {
      BookEntry entry = (BookEntry) map.get(anObject.toString());
      if (entry != null)

  public Component getEditorComponent() {
    return panel;

  public Object getItem() {
    return panel.getText();

  public void selectAll() {

  public void addActionListener(ActionListener l) {

  public void removeActionListener(ActionListener l) {

  //  We create our own inner class to handle setting and
  //  repainting the image and the text.
  class ImagePanel extends JPanel {

    JLabel imageIconLabel;

    JTextField textField;

    public ImagePanel(BookEntry initialEntry) {
      setLayout(new BorderLayout());

      imageIconLabel = new JLabel(initialEntry.getImage());
      imageIconLabel.setBorder(new BevelBorder(BevelBorder.RAISED));

      textField = new JTextField(initialEntry.getTitle());
      textField.setBorder(new BevelBorder(BevelBorder.LOWERED));

      add(imageIconLabel, BorderLayout.WEST);
      add(textField, BorderLayout.EAST);

    public void setText(String s) {

    public String getText() {
      return (textField.getText());

    public void setIcon(Icon i) {

    public void selectAll() {

    public void addActionListener(ActionListener l) {

    public void removeActionListener(ActionListener l) {


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