ActionExampleSwing.java Source code

Introduction

Here is the source code for ActionExampleSwing.java

Source

/*
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);
    }
}