signaturedialog.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: SignatureDialog.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.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Frame;

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

import java.util.Vector;

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

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

import javax.swing.border.EmptyBorder;

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


/**
 * A dialog which allows signitures to be created, modified and deleted.
 * The options are stored as part of the configuration properties.
 *
 * @see Configuration
 */
public class SignatureDialog
  extends JDialog
{
  private JList      sigList;
  private JTextField nameField;
  private JTextArea  signText;
  private JTextField namespaceField;


  /**
   * Construct a dialog for maintaining signitures.
   *
   * @param parent parent frame to return to after disposed
   */
  public
  SignatureDialog( Frame parent ) {
    super( parent, true );

    establishContents();
    pack();

    Dimension sz = getSize();
    int w = UserProperties.getProperty( "signatureDialog.width", sz.width );
    int h = UserProperties.getProperty( "signatureDialog.height", sz.height );
    setSize( w, h );

    setLocation( AWTUtilities.computeDialogLocation( this ) );

    validate();
  }

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

  private void
  saveField() {
    String sigName = this.nameField.getText();
    String signature = this.signText.getText();

    Vector list = UserProperties.getStringVector( Configuration.P_SIG_LIST, new Vector() );

    if ( ! list.contains( sigName ) ) {
      list.addElement( sigName );
      this.sigList.setListData( list );

      Configuration.getInstance().setStringArray( Configuration.P_SIG_LIST, list );
    }
    Configuration.getInstance().setProperty( Configuration.PP_SIGNATURE + sigName, signature );
    Configuration.getInstance().saveProperties();

    this.sigList.setSelectedValue( sigName, true );
    this.sigList.repaint( 100 );
  }

  private void
  deleteField() {
    String sigName = this.nameField.getText();
    String signature = this.signText.getText();

    Vector list = UserProperties.getStringVector( Configuration.P_SIG_LIST, new Vector() );
    if ( list.contains( sigName ) ) {
      list.removeElement( sigName );

      this.sigList.setListData( list );
      this.sigList.repaint( 100 );
      clearFields();

      Configuration.getInstance().setStringArray( Configuration.P_SIG_LIST, list );
      Configuration.getInstance().removeProperty( Configuration.PP_SIGNATURE + sigName );
      Configuration.getInstance().saveProperties();
    }
  }

  private void
  clearFields() {
    this.nameField.setText( "" );
    this.signText.setText( "" );
    this.sigList.getSelectionModel().clearSelection();
    this.nameField.requestFocus();
  }

  private void
  establishContents() {
    setTitle( ICEMail.getBundle().getString( "Signature.Title" ) );

    Container cont = getContentPane();
    cont.setLayout( new GridBagLayout() );

    ActionListener xlistener = new IActionListener();

    int row = 0;

    String[] nameList = UserProperties.getStringArray( Configuration.P_SIG_LIST, null );

    if ( nameList == null )
      this.sigList = new JList();
    else
      this.sigList = new JList( nameList );

    this.sigList.addListSelectionListener( new SelectionListener() );

    JScrollPane scroller = new JScrollPane();
    scroller.getViewport().add( this.sigList );

    JPanel fieldPan = new JPanel();
    fieldPan.setLayout( new GridBagLayout() );
    fieldPan.setBorder( new EmptyBorder( 4, 4, 4, 4 ) );

    int subRow = 0;

    JLabel  lbl;
    lbl = ComponentFactory.getLabel( ICEMail.getBundle(), "Signature.Name" );
    lbl.setHorizontalAlignment( JLabel.RIGHT );
    AWTUtilities.constrain( fieldPan, lbl, GridBagConstraints.NONE,
                            GridBagConstraints.WEST, 0, subRow, 1, 1, 0.0, 0.0 );

    this.nameField = ComponentFactory.getTextField ( ICEMail.getBundle(),
                                                     "Signature.Name", null );
    AWTUtilities.constrain( fieldPan, this.nameField, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.WEST, 1, subRow++, 1, 1, 1.0, 0.0 );

    lbl = ComponentFactory.getLabel( ICEMail.getBundle(), "Signature.Signature" );
    lbl.setHorizontalAlignment( JLabel.LEFT );
    AWTUtilities.constrain( fieldPan, lbl, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.WEST, 0, subRow++, 2, 1, 1.0, 0.0 );

    this.signText = new JTextArea();
    JScrollPane signScroll = new JScrollPane();
    signScroll.getViewport().add( this.signText );
    signScroll.setPreferredSize( new Dimension( 450, 150 ) );
    AWTUtilities.constrain( fieldPan, signScroll, GridBagConstraints.BOTH,
                            GridBagConstraints.NORTHWEST, 0, subRow++, 2, 1, 1.0, 1.0 );

    JPanel btnPan = new JPanel();
    btnPan.setLayout( new GridLayout( 2, 2, 10, 10) );
    btnPan.setBorder( new EmptyBorder( 6, 6, 6, 6 ) );

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

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

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

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

    JPanel listPan = new JPanel();
    listPan.setLayout( new BorderLayout() );
    listPan.setBorder( JFCUtilities.StandardBorder );

    listPan.add( scroller, BorderLayout.CENTER );
    scroller.setPreferredSize( new Dimension( 100, 70 ) );

    AWTUtilities.constrain( cont, listPan, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.NORTHWEST, 0, 0, 1, 1, 0.3, 0.0 );

    AWTUtilities.constrain( cont, btnPan, GridBagConstraints.HORIZONTAL,
                            GridBagConstraints.NORTHWEST, 1, 0, 1, 1, 0.7, 0.0 );

    AWTUtilities.constrain( cont, fieldPan, GridBagConstraints.BOTH,
                            GridBagConstraints.NORTH, 0, 1, 2, 1, 1.0, 1.0 );
  }

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

  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( "SAVE" ) ) {
        saveField();
      } else if ( command.equals( "DELETE" ) ) {
        deleteField();
      } else if ( command.equals( "CLEAR" ) ) {
        clearFields();
      } else if ( command.equals( "CLOSE" ) ) {
        dispose();
      }
    }
  }

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

  private class SelectionListener
    implements ListSelectionListener
  {
    public void
    valueChanged( ListSelectionEvent event ) {
      if ( ! event.getValueIsAdjusting() ) {
        String sigName = (String) sigList.getSelectedValue();

        if ( sigName != null ) {
          nameField.setText( sigName );

          String sigStr =
            UserProperties.getProperty( Configuration.PP_SIGNATURE + sigName, "" );

          nameField.setText( sigName );
          signText.setText( sigStr );
        }
      }
    }
  }

}