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
*/
// ActionExampleSwing.java
//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));
updateProperties();
}
public void updateProperties() {
putValue(NAME, "Go to channel " + favoriteChannel);
putValue(SHORT_DESCRIPTION, "Change the channel to "
+ favoriteChannel);
}
public void actionPerformed(ActionEvent ae) {
setChannel(favoriteChannel);
}
}
public class SetFavoriteAction extends AbstractAction {
public SetFavoriteAction() {
putValue(NAME, "Set 'Go to' channel");
putValue(SMALL_ICON, new ImageIcon("images/set.gif"));
putValue(SHORT_DESCRIPTION,
"Make current channel the Favorite channel");
putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_S));
}
public void actionPerformed(ActionEvent ae) {
favoriteChannel = currentChannel;
gotoFavoriteAction.updateProperties();
setEnabled(false);
gotoFavoriteAction.setEnabled(false);
}
}
public ActionExampleSwing() {
super("ActionExample Swing");
setChannel(currentChannel); // enable/disable the Actions as appropriate
channelLabel.setHorizontalAlignment(JLabel.CENTER);
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.addSeparator();
menu.add(new JMenuItem(gotoFavoriteAction));
menu.add(new JMenuItem(setFavoriteAction));
mb.add(menu);
setJMenuBar(mb);
}
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);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
}
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