An application that shows the Action class in, well, action : Various Event Listener « Event « Java

An application that shows the Action class in, well, action

An application that shows the Action class in, well, action
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
//An application that shows the Action class in, well, action.

import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;

public class ActionExampleSwing extends JFrame {

  public static final int MIN_CHANNEL = 2;

  public static final int MAX_CHANNEL = 13;

  private int currentChannel = MIN_CHANNEL;

  private int favoriteChannel = 9;

  private JLabel channelLabel = new JLabel();

  private Action upAction = new UpAction();

  private Action downAction = new DownAction();

  private GotoFavoriteAction gotoFavoriteAction = new GotoFavoriteAction();

  private Action setFavoriteAction = new SetFavoriteAction();

  public class UpAction extends AbstractAction {
    public UpAction() {
      putValue(NAME, "Channel Up");
      putValue(SMALL_ICON, new ImageIcon("images/up.gif"));
      putValue(SHORT_DESCRIPTION, "Increment the channel number");
      putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_U));

    public void actionPerformed(ActionEvent ae) {
      setChannel(currentChannel + 1);

  public class DownAction extends AbstractAction {
    public DownAction() {
      putValue(NAME, "Channel Down");
      putValue(SMALL_ICON, new ImageIcon("images/down.gif"));
      putValue(SHORT_DESCRIPTION, "Decrement the channel number");
      putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_D));

    public void actionPerformed(ActionEvent ae) {
      setChannel(currentChannel - 1);

  public class GotoFavoriteAction extends AbstractAction {
    public GotoFavoriteAction() {
      putValue(SMALL_ICON, new ImageIcon("images/fav.gif"));
      putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_G));

    public void updateProperties() {
      putValue(NAME, "Go to channel " + favoriteChannel);
      putValue(SHORT_DESCRIPTION, "Change the channel to "
          + favoriteChannel);

    public void actionPerformed(ActionEvent ae) {

  public class SetFavoriteAction extends AbstractAction {
    public SetFavoriteAction() {
      putValue(NAME, "Set 'Go to' channel");
      putValue(SMALL_ICON, new ImageIcon("images/set.gif"));
          "Make current channel the Favorite channel");
      putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_S));

    public void actionPerformed(ActionEvent ae) {
      favoriteChannel = currentChannel;

  public ActionExampleSwing() {
    super("ActionExample Swing");

    setChannel(currentChannel); // enable/disable the Actions as appropriate

    channelLabel.setFont(new Font("Serif", Font.PLAIN, 32));

    getContentPane().add(channelLabel, BorderLayout.NORTH);

    JPanel buttonPanel = new JPanel(new GridLayout(2, 2, 16, 6));
    buttonPanel.setBorder(BorderFactory.createEmptyBorder(6, 16, 16, 16));
    getContentPane().add(buttonPanel, BorderLayout.CENTER);
    buttonPanel.add(new JButton(upAction));
    buttonPanel.add(new JButton(gotoFavoriteAction));
    buttonPanel.add(new JButton(downAction));
    buttonPanel.add(new JButton(setFavoriteAction));

    JMenuBar mb = new JMenuBar();
    JMenu menu = new JMenu("Channel");
    menu.add(new JMenuItem(upAction));
    menu.add(new JMenuItem(downAction));
    menu.add(new JMenuItem(gotoFavoriteAction));
    menu.add(new JMenuItem(setFavoriteAction));

  public void setChannel(int chan) {
    currentChannel = chan;
    channelLabel.setText("Now tuned to channel: " + currentChannel);
    // enable/disable the Actions as appropriate
    downAction.setEnabled(currentChannel > MIN_CHANNEL);
    upAction.setEnabled(currentChannel < MAX_CHANNEL);
    gotoFavoriteAction.setEnabled(currentChannel != favoriteChannel);
    setFavoriteAction.setEnabled(currentChannel != favoriteChannel);

  public static void main(String argv[]) {
    JFrame f = new ActionExampleSwing();
    f.setSize(400, 180);


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