MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

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 MainClass extends JFrame {

    public static final int MIN_NUMBER = 2;

    public static final int MAX_NUMBER = 13;

    private int currentNumber = MIN_NUMBER;

    private int favoriteNumber = 9;

    private JLabel numberLabel = 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, "Number Add");
            putValue(SMALL_ICON, new ImageIcon("images/up.gif"));
            putValue(SHORT_DESCRIPTION, "Increment the number");
            putValue(MNEMONIC_KEY, new Integer(KeyEvent.VK_A));
        }

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

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

        public void actionPerformed(ActionEvent ae) {
            setChannel(currentNumber - 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 number " + favoriteNumber);
            putValue(SHORT_DESCRIPTION, "Change the number to " + favoriteNumber);
        }

        public void actionPerformed(ActionEvent ae) {
            setChannel(favoriteNumber);
        }
    }

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

        public void actionPerformed(ActionEvent ae) {
            favoriteNumber = currentNumber;
            gotoFavoriteAction.updateProperties();
            setEnabled(false);
            gotoFavoriteAction.setEnabled(false);
        }
    }

    public MainClass() {
        super();

        setChannel(currentNumber);

        numberLabel.setHorizontalAlignment(JLabel.CENTER);
        numberLabel.setFont(new Font("Serif", Font.PLAIN, 32));

        getContentPane().add(numberLabel, 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("Number");
        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) {
        currentNumber = chan;
        numberLabel.setText("Now tuned to number: " + currentNumber);
        downAction.setEnabled(currentNumber > MIN_NUMBER);
        upAction.setEnabled(currentNumber < MAX_NUMBER);
        gotoFavoriteAction.setEnabled(currentNumber != favoriteNumber);
        setFavoriteAction.setEnabled(currentNumber != favoriteNumber);
    }

    public static void main(String argv[]) {
        JFrame f = new MainClass();
        f.setSize(400, 180);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }
}