001    /*
002     * Copyright (c) 2005 Einar Pehrson <einar@pehrson.nu>.
003     *
004     * This file is part of
005     * CleanSheets - a spreadsheet application for the Java platform.
006     *
007     * CleanSheets is free software; you can redistribute it and/or modify
008     * it under the terms of the GNU General Public License as published by
009     * the Free Software Foundation; either version 2 of the License, or
010     * (at your option) any later version.
011     *
012     * CleanSheets is distributed in the hope that it will be useful,
013     * but WITHOUT ANY WARRANTY; without even the implied warranty of
014     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015     * GNU General Public License for more details.
016     *
017     * You should have received a copy of the GNU General Public License
018     * along with CleanSheets; if not, write to the Free Software
019     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020     */
021    package csheets.ui.ctrl;
022    
023    import java.awt.event.ActionEvent;
024    import java.awt.event.KeyEvent;
025    import java.io.BufferedReader;
026    import java.io.IOException;
027    import java.io.InputStream;
028    import java.io.InputStreamReader;
029    
030    import javax.swing.ImageIcon;
031    import javax.swing.JOptionPane;
032    
033    import csheets.CleanSheets;
034    
035    /**
036     * An action for displaying the about window.
037     * @author Einar Pehrson
038     */
039    @SuppressWarnings("serial")
040    public class AboutAction extends BaseAction {
041    
042            /** The text to display in the about dialog */
043            private String text;
044    
045            /**
046             * Creates a new about action.
047             */
048            public AboutAction() {
049                    InputStream stream = CleanSheets.class.getResourceAsStream(
050                            "res/doc/about.txt");
051                    if (stream != null) {
052                            // Loads text from file
053                            try {
054                                    BufferedReader br = new BufferedReader(new InputStreamReader(stream));
055                                    int availableBytes = stream.available();
056                                    char[] chars = new char[availableBytes];
057                                    br.read(chars, 0, availableBytes);
058                                    text = new String(chars);
059                            } catch (Exception ex) {
060                                    text = "An error occurred when loading the text.";
061                            } finally {
062                                    try {
063                                            stream.close();
064                                    } catch (IOException e) {}
065                            }
066                    } else
067                            setEnabled(false);
068            }
069    
070            protected String getName() {
071                    return "About...";
072            }
073    
074            protected void defineProperties() {
075                    putValue(MNEMONIC_KEY, KeyEvent.VK_A);
076                    putValue(SMALL_ICON, new ImageIcon(CleanSheets.class.getResource("res/img/about.gif")));
077            }
078    
079            public void actionPerformed(ActionEvent e) {
080                    JOptionPane.showMessageDialog(null,
081                            text,
082                            "About CleanSheets",
083                            JOptionPane.INFORMATION_MESSAGE,
084                            new ImageIcon(CleanSheets.class.getResource("res/img/sheet.gif")));
085            }
086    }