aboutdialog.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: AboutDialog.java,v 1.5 2001/05/07 12:37:21 kunugi Exp $
**
** Copyright (c) 2000-2001 Jeff Gay
** on behalf of ICEMail.org <http://www.icemail.org>
** Copyright (c) 1998-2000 by Timothy Gerard Endres
** 
** This program is free software.
** 
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE. 
** 
*/

package org.icemail.mail;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ImageIcon;

import javax.swing.border.EmptyBorder;

import org.icemail.util.AWTUtilities;
import org.icemail.util.JFCUtilities;


/**
 * Create a dialog containing information about the application.
 */
public class AboutDialog
  extends JDialog
{
  private JTextArea messageText_ = null;

  /**
   * Construct an dialog, associating it with the given parent frame.
   */
  public
  AboutDialog( Frame parent ) {

    super( parent, "About ICEMail", true );

    establishDialogContents();
    pack();

    Dimension sz = getSize();
    Point location = AWTUtilities.computeDialogLocation( this, sz.width, sz.height );

    setLocation( location.x, location.y );
  }

  /**
   * Dispose of the dialog and any allocated resources.
   * <p>
   * Implementation of java.awt.Window.dispose()
   */
  public void
  dispose() {
    messageText_ = null;

    super.dispose();
  }

  /**
   * Establish the contents of the dialog.
   */
  private void
  establishDialogContents() {

    JLabel logoLabel = null;
    try {
      Image img =
        AWTUtilities.getImageResource( "/org/icemail/mail/images/splash.gif" );
      ImageIcon icon = new ImageIcon( img );
      logoLabel = new JLabel( icon );
    } catch ( IOException ex ) {
      logoLabel = new JLabel( "ICEMail" );
    }
    logoLabel.setOpaque( true );
    logoLabel.setBackground( Color.white );
    logoLabel.setBorder( JFCUtilities.StandardBorder );

    messageText_ = new JTextArea();
    messageText_.setEditable( false );
    messageText_.setOpaque( true );
    messageText_.setMargin( new Insets( 5, 5, 5, 5 ) );
    messageText_.setBorder( JFCUtilities.StandardBorder );
    messageText_.setFont( Font.getFont( "aboutDialog.font",
                                        new Font( "Serif", Font.PLAIN, 12 ) ) );
    messageText_.setText(
      "ICEMail  Release " + ICEMail.getVersionString() + ", Java EMail Client\n" +
      "\n" +
      "Copyright (c) 2000-2001 Jeff Gay, Lucy Zhao\n" +
      "on behalf of ICEMail.org <http://www.icemail.org>\n" +
      "Copyright (c) 1998-2000 by Timothy Gerard Endres\n" +
      "\n" +
      "POP3 SPI by Y. Miyadate, [e-mail]\n" +
      "Copyright (c) 1999 by Y. Miyadate\n" +
      "\n" +
      "ICEMail is free software, which is licensed to you under the\n" +
      "GNU General Public License, version 2. Please see the file\n" +
      "GettingStarted.htm for more details on licenses.\n" +
      "\n" +
      "This software is provided AS-IS, with ABSOLUTELY NO WARRANTY.\n" +
      "YOU ASSUME ALL RESPONSIBILITY FOR ANY AND ALL CONSEQUENCES\n" +
      "THAT MAY RESULT FROM THE USE OF THIS SOFTWARE!"
      ); 

    JScrollPane scroller = new JScrollPane();
    scroller.getViewport().add( messageText_ );

    JPanel ctlPan = new JPanel();
    ctlPan.setBorder( new EmptyBorder( 5, 7, 3, 3 ) );
    ctlPan.setLayout( new BorderLayout() );

    JButton button = new JButton( "Dismiss" );
    button.addActionListener( new IActionListener() );
    button.setActionCommand( "OK" );
    ctlPan.add( BorderLayout.EAST, button );

    JPanel content = new JPanel();
    content.setLayout( new BorderLayout( 0, 8 ) );
    content.setBorder( new EmptyBorder( 6, 6, 6, 6 ) );

    content.add( BorderLayout.NORTH, logoLabel );
    content.add( BorderLayout.CENTER, scroller );
    content.add( BorderLayout.SOUTH, ctlPan );

    getContentPane().add( content );
  }

//............................................................

  private class IActionListener
    implements ActionListener
  {
    /**
     * Invoked when an action occurs.
     * <p>
     * Implementation of java.awt.event.ActionListener.actionPerformed()
     *
     * @param event the action event that occured
     */
    public void
    actionPerformed( ActionEvent event ) {
      String command = event.getActionCommand();

      if ( command.compareTo( "OK" ) == 0 ) {
        dispose();
      }
    }
  }

}