/*  AboutDialog - A about box for JavaChess with some info on the project.  Copyright (C) 2003 The Java-Chess team <info@java-chess.de>  This program is free software; you can redistribute it and/or  modify it under the terms of the GNU General Public License  as published by the Free Software Foundation; either version 2  of the License, or (at your option) any later version.  This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  GNU General Public License for more details.  You should have received a copy of the GNU General Public License  along with this program; if not, write to the Free Software  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.*/package de.java_chess.javaChess.dialogs;import java.awt.*;import java.awt.event.*;import javax.swing.*;/** * This class implements the about box. */public class AboutDialog extends JDialog implements ActionListener {    // Instance variables    /**     * The only instance of this class (implements the singleton pattern).     */    private static AboutDialog _instance = null;    /**     * A button to hide the dialog.     */    private JButton _okButton;        // Constructors    /**     * Create a new about dialog.     *     * @param parent The parent frame.     * @param modal Flag, if the dialog is modal.     */    private AboutDialog( JFrame parent, boolean modal) {	super( parent, modal);	setTitle( "About JavaChess");  // Set the title of the dialog.	// Set a new layout with bigger gaps.	getContentPane().setLayout( new BorderLayout( 16, 16));	JTextArea aboutText = new JTextArea();	aboutText.setEditable( false);	aboutText.setText( getAboutText());	getContentPane().add( new JScrollPane( aboutText));	// Add a button to hide the dialog.	_okButton = new JButton("Ok");	_okButton.addActionListener( this);	getContentPane().add( _okButton, BorderLayout.SOUTH);	pack();	// Get the screen size and place the dialog in the middle of the screen.	Dimension size = getSize();	Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();        setLocation( screenSize.width / 2 - size.width / 2, screenSize.height / 2 - size.height / 2);         }    // Methods    /**     * Get the only instance of this class.     *     * @return The only instance of this class.     */    public final static AboutDialog getInstance() {	if( _instance == null) {	    _instance = new AboutDialog( null, true);	}	return _instance;    }    /**     * A method to handle action events coming from the dialog.     *     * @param event The event that triggered this action.     */    public void actionPerformed( ActionEvent event) {	setVisible( false);    }    /**     * Get the about text. Might be put in a separate file later, so     * I encapsulated this in a function.     *     * @return The about text.     */    private final String getAboutText() {	return "Welcome to the JavaChess project!\n\n"	    + "You can get the latest version at http://www.java-chess.de\n"	    + "Please contact us at info@java-chess.de , if you want to contribute,\n"	    + "have question or suggestions.\n\n"	    + "We hope you enjoy to use our little toy...\n\n"	    + "Harald Faber <harald.faber@java-chess.de>\n"	    + "Andreas R點kert <andreas.rueckert@java-chess.de>";    }}