JFileChooser class in action with an accessory : File Chooser « Swing JFC « Java

JFileChooser class in action with an accessory

JFileChooser class in action with an accessory
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
// AccessoryFileChooser.java
//An example of the JFileChooser class in action with an accessory. This
//accessory (see AudioAccessory.java) will play simple audio files within
//the file chooser.

import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.net.URL;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class AccessoryFileChooser extends JFrame {
  JFileChooser chooser = null;

  JLabel statusbar;

  public AccessoryFileChooser() {
    super("Accessory Test Frame");
    setSize(350, 200);
    Container c = getContentPane();
    c.setLayout(new FlowLayout());

    JButton accButton = new JButton("Accessory");
    statusbar = new JLabel("Output of your selection will go here");
    chooser = new JFileChooser();
    AudioAccessory aa = new AudioAccessory();
    chooser.addPropertyChangeListener(aa); // to receive selection changes
    chooser.addActionListener(aa); // to receive approve/cancel button
                     // events

    accButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        int option = chooser.showOpenDialog(AccessoryFileChooser.this);
        if (option == JFileChooser.APPROVE_OPTION) {
          statusbar.setText("You chose "
              + ((chooser.getSelectedFile() != null) ? chooser
                  .getSelectedFile().getName() : "nothing"));
        } else {
          statusbar.setText("You canceled.");

  public static void main(String args[]) {
    AccessoryFileChooser afc = new AccessoryFileChooser();

//An accessory for JFileChooser that lets you play music clips. Only the
//simple .au, .aiff and .wav formats available through the Applet sound
//classes can be played.

class AudioAccessory extends JPanel implements PropertyChangeListener,
    ActionListener {

  AudioClip currentClip;

  String currentName = "";

  JLabel fileLabel;

  JButton playButton, stopButton;

  public AudioAccessory() {
    // Set up the accessory. The file chooser will give us a reasonable
    // size.
    setLayout(new BorderLayout());
    add(fileLabel = new JLabel("Clip Name"), BorderLayout.NORTH);
    JPanel p = new JPanel();
    playButton = new JButton("Play");
    stopButton = new JButton("Stop");
    add(p, BorderLayout.CENTER);

    playButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        if (currentClip != null) {
    stopButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        if (currentClip != null) {

  public void propertyChange(PropertyChangeEvent e) {
    String pname = e.getPropertyName();
    if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(pname)) {
      // Ok, the user selected a file in the chooser
      File f = (File) e.getNewValue();

      // Make reasonably sure it's an audio file
      if ((f != null)
          && (f.getName().toLowerCase().endsWith(".au")
              || f.getName().toLowerCase().endsWith(".wav")
              || f.getName().toLowerCase().endsWith(".aif") || f
              .getName().toLowerCase().endsWith(".aiff"))) {
      } else {

  public void setCurrentClip(File f) {
    if (currentClip != null) {
    // Make sure we have a real file, otherwise, disable the buttons
    if ((f == null) || (f.getName() == null)) {
      fileLabel.setText("no audio selected");

    // Ok, seems the audio file is real, so load it and enable the buttons
    String name = f.getName();
    if (name.equals(currentName)) {
      // Same clip they just loaded...make sure the player is enabled
    currentName = name;
    try {
      URL u = new URL("file:///" + f.getAbsolutePath());
      currentClip = Applet.newAudioClip(u);
    } catch (Exception e) {
      currentClip = null;
      fileLabel.setText("Error loading clip.");

  public void actionPerformed(ActionEvent ae) {
    // Be a little cavalier here...we're assuming the dialog was just
    // approved or cancelled so we should stop any playing clip
    if (currentClip != null) {


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