viewasdialog.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: ViewAsDialog.java,v 1.4 2001/05/07 12:37:22 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.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Point;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import java.util.Enumeration;
import java.util.Vector;

import javax.activation.CommandInfo;
import javax.activation.CommandMap;

import javax.mail.Part;
import javax.mail.MessagingException;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import javax.swing.border.EmptyBorder;

import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

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


/**
 * A dialog which allows the user to select an alternative MIME type for
 * viewing attachments.
 *
 * @see QuickViewer
 */
public class ViewAsDialog
  extends JDialog
{
  private JTextField typeField_;
  private String     contentType_ = null;


  /**
   * Construct a dialog for selecting an alternative MIME type for the given part.
   *
   * @param parent parent frame to return to after disposed
   * @param part   the part to be viewed
   */
  public
  ViewAsDialog( Frame parent, Part part ) {
    super( parent, true );

    establishDialogContents( part );
    pack();

    Dimension sz = getPreferredSize();

    sz.width = UserProperties.getProperty( "viewAsDialog.width", sz.width );
    sz.height = UserProperties.getProperty( "viewAsDialog.height", sz.height );

    setSize( sz );

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

    invalidate();
    validate();
  }

  public String
  getViewAsType() {
    return contentType_;
  }

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

  private Vector
  getContentTypes() {
    Vector result = UserProperties.getStringVector( "viewAsTypeList", new Vector() );

    Enumeration xenum = Configuration.getInstance().getMailcapTypes();
    while ( xenum.hasMoreElements() ) {
      String xtype = (String)xenum.nextElement();
      if ( ! result.contains( xtype ) ) {
        result.addElement( xtype );
      }
    }
    return result;
  }

  private boolean
  validateType() {
    contentType_ = typeField_.getText();
    CommandInfo ci =
      CommandMap.getDefaultCommandMap().getCommand( contentType_, "view" );

    if ( ci == null ) {
      Object[] xargs = new Object[1];
      xargs[0] = contentType_;
      ComponentFactory.showDialog( ICEMail.getBundle(), "ViewAs.NoViewer",
                                   0, JOptionPane.ERROR_MESSAGE, xargs );
      return false;
    }
    return true;
  }

  private void
  establishDialogContents( Part part ) {
    setTitle( ICEMail.getBundle().getString( "ViewAs.Title" ) );

    Container content = getContentPane();

    ActionListener xlistener = new IActionListener();

    JTextArea  propsText = new JTextArea();
    propsText.setEditable( false );
    propsText.setBorder( JFCUtilities.StandardBorder );
    propsText.setFont( UserProperties.getFont( "viewAsDialog.properties.font",
                                               new Font( "Dialog", Font.BOLD, 12 ) ) );

    StringBuffer propBuf = new StringBuffer( 1024 );

    propBuf.append( ICEMail.getBundle().getString( "ViewAs.PartProperties" ) );

    try {
      propBuf.append( "\n  Filename: " );
      propBuf.append( MessageUtilities.getFileName( part ) );

      propBuf.append( "\n  Content-Type: " );
      propBuf.append( MessageUtilities.getContentType( part ).toString() );

      propBuf.append( "\n  Size: " );
      propBuf.append( part.getSize() );

      propBuf.append( "\n  Description: " );
      propBuf.append( part.getDescription() );

      propBuf.append( "\n  Disposition: " );
      propBuf.append( part.getDisposition() );
    } catch ( MessagingException ex ) {
      propBuf.append( "\n  *** Exception: " );
      propBuf.append( ex.getMessage() );
    }

    propsText.setText( propBuf.toString() );

    JScrollPane scroller = new JScrollPane();
    scroller.getViewport().add( propsText );
    scroller.setMinimumSize( new Dimension( 75, 50 ) );

    JPanel namePanel = new JPanel();
    namePanel.setLayout( new GridBagLayout() );
    namePanel.setBorder( JFCUtilities.StandardBorder );

    JLabel lbl;
    lbl = ComponentFactory.getLabel( ICEMail.getBundle(), "ViewAs" );

    lbl.setBorder( new EmptyBorder( 2, 2, 2, 4 ) );
    lbl.setHorizontalAlignment( JLabel.RIGHT );
    AWTUtilities.constrain( namePanel, lbl, GridBagConstraints.NONE,
                            GridBagConstraints.CENTER, 0, 0, 1, 1, 0.0, 0.0 );

    typeField_ =
      ComponentFactory.getTextField( ICEMail.getBundle(), "ViewAs", null );
    AWTUtilities.constrain( namePanel, typeField_, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 1, 0, 1, 1, 1.0, 0.0 );

    Vector contentTypes = getContentTypes();
    JList  typeList = new JList( contentTypes );
    typeList.addListSelectionListener( new IListSelectionListener() );
    typeList.addMouseListener( new IMouseAdapter() );

    JScrollPane listScroller = new JScrollPane();
    listScroller.getViewport().add( typeList );
    listScroller.setMinimumSize( new Dimension( 75, 50 ) );

    JPanel btnPan = new JPanel();
    btnPan.setBorder( JFCUtilities.StandardBorder );
    btnPan.setLayout( new GridLayout( 1, 1, 20, 20 ) );

    JButton     btn;
    btn = ComponentFactory.getButton( ICEMail.getBundle(), "ViewAs.View",
                                      xlistener, null );
    btnPan.add( btn );

    btn = ComponentFactory.getButton( ICEMail.getBundle(), "ViewAs.Cancel",
                                      xlistener, null );
    btnPan.add( btn );

    content.setLayout( new GridBagLayout() );

    int row = 0;

    AWTUtilities.constrain( content, scroller, GridBagConstraints.BOTH,
                            GridBagConstraints.CENTER, 0, row++, 1, 1, 1.0, 0.4 );

    AWTUtilities.constrain( content, listScroller, GridBagConstraints.BOTH,
                            GridBagConstraints.CENTER, 0, row++, 1, 1, 1.0, 0.6 );

    AWTUtilities.constrain( content, namePanel, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 0, row++, 1, 1, 1.0, 0.0 );

    AWTUtilities.constrain( content, btnPan, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.CENTER, 0, row++, 1, 1, 1.0, 0.0 );
  }

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

  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.equals( "VIEW" ) ) {
        if ( validateType() ) {
          dispose();
        }
      } else if ( command.equals( "CANCEL" ) ) {
        contentType_ = null;
        dispose();
      }
    }
  }

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

  private class IListSelectionListener
    implements ListSelectionListener
  {
    public void
    valueChanged( ListSelectionEvent event ) {
      if ( ! event.getValueIsAdjusting() ) {
        JList xlist = (JList)event.getSource();
        typeField_.setText( (String) xlist.getSelectedValue() );
      }
    }
  }

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

  private class IMouseAdapter
    extends MouseAdapter
  {
    public void
    mouseClicked( MouseEvent event ) {
      if( event.getClickCount() == 2 && validateType() ) {
        dispose();
      }
    }
  }

}