Main.java Source code

Introduction

Here is the source code for Main.java

Source

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * Demo to show a way of having "More Choices/Less Choices" in a pop-up window.
 * The secret is to call pack() again each time you add/subtract the bottom
 * panel.
 * 
 * @author Ian F. Darwin, http://www.darwinsys.com/
 * @version $Id: MoreChoices.java,v 1.3 2004/02/09 03:33:50 ian Exp $
 */
public class Main extends JFrame {
    Container cp;

    boolean unsavedChanges = false;

    JButton moreOrLessButton;

    JPanel moreOrLessPanel;

    ActionListener more;

    ActionListener less;

    /** "main program" method - construct and show */
    public static void main(String[] av) {
        // create a MoreChoices object, tell it to show up
        JFrame jf = new Main();
        jf.setLocation(100, 100); // get away from screen corner,
        // since on some OSes a main window at 0,0 may be
        // partly obscured (e.g. notebook with PowerPanel
        jf.setVisible(true);
    }

    /** Construct the object including its GUI */
    public Main() {
        super("More Choices");
        // cp = getContentPane();
        cp = this;
        cp.setLayout(new BorderLayout());

        ButtonsPanel bp = new ButtonsPanel();
        cp.add(BorderLayout.NORTH, bp);

        // Construct the more/less switcher
        less = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                cp.remove(moreOrLessPanel);
                pack();
                moreOrLessButton.setText("More Choices");
                moreOrLessButton.removeActionListener(less);
                moreOrLessButton.addActionListener(more);
            }
        };
        more = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                cp.add(BorderLayout.SOUTH, moreOrLessPanel);
                pack();
                moreOrLessButton.setText("Fewer Choices");
                moreOrLessButton.removeActionListener(more);
                moreOrLessButton.addActionListener(less);
            }
        };
        bp.add(moreOrLessButton = new JButton("More Choices"));
        // Initial state is to add more choices
        moreOrLessButton.addActionListener(more);

        moreOrLessPanel = new ChoicesPanel();

        // Finally a frame closer
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                setVisible(false);
                dispose();
                System.exit(0);
            }
        });

        pack();
    }

    /**
     * The panel that appears when you press More Choices. This is a toy; in a
     * real application, this would likely be a separate full "public class".
     */
    class ChoicesPanel extends JPanel {
        ChoicesPanel() {
            setBorder(BorderFactory.createEtchedBorder());
            add(new JCheckBox("Happiness"));
            add(new JCheckBox("Satisfaction"));
            add(new JCheckBox("Contentment"));
        }
    }

    /**
     * The Panel that contains the More/Less button. It is just here to override
     * getPreferredSize so that we can avoid "jitter" (i.e., the width changing);
     * i.e., we must ensure that the main panel and the ChoicePanel have the same
     * width
     */
    class ButtonsPanel extends JPanel {
        public Dimension getPreferredSize() {
            // System.out.println("In ButtonsPanel.getPreferredSize()");
            // For height, use our normal height
            int dHeight = moreOrLessButton.getPreferredSize().height + 5 + 5;
            // For witdh, use the included Panel's width
            int dWidth = moreOrLessPanel.getPreferredSize().width;
            // Combine them; that's the result we need.
            return new Dimension(dWidth, dHeight);
        }
    }
}