mainframe.java

一个用java写的mail.里面的代码值得我们去研究！学习。

/*
** $Id: MainFrame.java,v 1.11 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.Component;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FileDialog;
import java.awt.Rectangle;

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

import java.io.File;

import java.net.URL;

import java.util.Hashtable;

import javax.help.CSH;
import javax.help.HelpBroker;
import javax.help.HelpSet;

import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

import org.icemail.Package;

import org.icemail.smime.SMIMELibrary;

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


/**
 * Class MainFrame
 */
public class MainFrame
  extends JFrame
{
  private static final int Debug_ = Package.DEBUG ? Package.getLevel( "MainFrame" ) : 0;

  private static final String NEWMAIL_PREFIX = "@";

  private static MainFrame  Instance_;

  private MainPanel         mainPanel_;
  
  private Cursor            saveCursor = null;
  private Hashtable         saveCursors = new Hashtable();


  /**
   * Default constructor, private to disable multiple instantiations.
   */
  private
  MainFrame() {
    super();

    setTitle( ICEMail.getBundle().getString( "MainFrame.Title" ) );

    mainPanel_ = new MainPanel();
    
    getContentPane().add( mainPanel_ );

    establishMenuBar();

    addWindowListener( new IWindowAdapter() );

    pack();

    loadLayoutProperties();
  }

  /**
   * Get the SINGLE instance of the frame, creating it if necessary.
   *
   * @return the SINGLE instance of the frame
   */
  public static synchronized MainFrame
  getInstance() {
    if ( MainFrame.Instance_ == null ) {
      MainFrame.Instance_ = new MainFrame();
    }
    return MainFrame.Instance_;
  }

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

  public void
  loadLayoutProperties() {
    Dimension sz = getSize();
    Rectangle bounds = Configuration.getBounds( Configuration.P_MAIN_WINDOW,
                                                new Rectangle( 20, 20, sz.width, sz.height ) );
    setBounds( bounds );

    mainPanel_.loadLayoutProperties();
  }

  public void
  saveLayoutProperties() {
    Configuration.saveBounds( Configuration.P_MAIN_WINDOW, getBounds() );

    mainPanel_.saveLayoutProperties();
  }

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

  private void
  changeLookAndFeel( String classname ) {
    if ( Package.DEBUG && Package.isTraceable( "MainFrame" ) ) {
      System.out.println( "MainFrame.changeLookAndFeel(s): " + classname );
    }

    String plafName;
    int index = classname.lastIndexOf( classname );
    if ( index < 0 ) {
      plafName = classname;
    } else {
      plafName = classname.substring( index + 1 );
    }

    try {
      UIManager.setLookAndFeel( classname );
      SwingUtilities.updateComponentTreeUI( getRootPane() );
    } catch ( IllegalAccessException ex ) {
      lookAndFeelExMessage( plafName, classname, ex.getMessage(),
                                 "could not be accessed" );
    } catch ( InstantiationException ex ) {
      lookAndFeelExMessage( plafName, classname, ex.getMessage(),
                                 "could not be instantiated" );
    } catch ( ClassNotFoundException ex ) {
      lookAndFeelExMessage( plafName, classname, ex.getMessage(),
                                 "could not be located" );
    } catch ( UnsupportedLookAndFeelException ex ) {
      lookAndFeelExMessage( plafName, classname, ex.getMessage(),
                                 "is not supported on this platform" );
    }
  }

  private void
  lookAndFeelExMessage( String name, String className, String exMsg, String msg ) {
    System.err.println( "Look and feel '" + name + "' " + msg + "." );
    
    if ( exMsg.length() > 0 )
      System.err.println( "\t" + exMsg );
  }

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

  public void
  toggleTitleHilite( boolean on ) {
    String title = getTitle();
    if ( on ) {
      if ( ! title.startsWith( NEWMAIL_PREFIX ) ) {
        setTitle( NEWMAIL_PREFIX + title );
      }
    } else {
      if ( title.startsWith( NEWMAIL_PREFIX ) ) {
        setTitle( title.substring( 1 ) );
      }
    }
  }

  private void
  establishMenuBar() {
    if ( Package.DEBUG && Package.isTraceable( "MainFrame" ) ) {
      System.out.println( "MainFrame.establishMenuBar()" );
    }

    JMenuBar xmenubar = new JMenuBar();
    JMenu    xmenu;

    // file menu
    xmenu = ComponentFactory.getMenuAndItems( ICEMail.getBundle(), "MainFrame.File",
                                              new FileMenuActionListener() );
    xmenubar.add( xmenu );

    // edit menu
    xmenu = ComponentFactory.getMenuAndItems( ICEMail.getBundle(), "MainFrame.Edit",
                                              new EditMenuActionListener() );
    xmenubar.add( xmenu );

    // mail menu
    addMailMenu( xmenubar );

    // configuration menu
    addConfigureMenu( xmenubar );

    // help menu
    addHelpMenu( xmenubar );

    // look and feel menu
    boolean showUI = UserProperties.getProperty( "displayUIMenu", false );
    
    if ( showUI ) {
      addLookAndFeelMenu( xmenubar );
    }

    setJMenuBar( xmenubar );
  }

  private void
  addMailMenu( JMenuBar mbar ) {
    JMenu menu = ComponentFactory.getMenuAndItems( ICEMail.getBundle(), "MainFrame.Mail",
                                                   new MailMenuActionListener() );

    if ( ICEMail.getSMIMELibrary() == null ) {
      int xitems = menu.getItemCount();
      JMenuItem xitem;
      for ( int xindex = 0; xindex < xitems; xindex++ ) {
        xitem = menu.getItem( xindex );
        if ( xitem != null && xitem.getActionCommand().equals( "TOGGLESMIME" ) ) {
          xitem.setEnabled( false );
        }
      }
    }

    mbar.add( menu );
  }

  private void
  addConfigureMenu( JMenuBar mbar ) {
    JMenu menu = ComponentFactory.getMenuAndItems( ICEMail.getBundle(), "MainFrame.Config",
                                                   new ConfigureMenuActionListener() );

    if ( ICEMail.getSMIMELibrary() == null ) {
      int xitems = menu.getItemCount();
      JMenuItem xitem;
      for ( int xindex = 0; xindex < xitems; xindex++ ) {
        xitem = menu.getItem( xindex );
        if ( xitem != null && xitem.getActionCommand().equals( "SECURITY" ) ) {
          xitem.setEnabled( false );
        }
      }
    }

    mbar.add( menu );
  }

  private void
  addHelpMenu( JMenuBar menubar ) {
    HelpMenuActionListener xlistener = new HelpMenuActionListener();
    JMenu xmenu = ComponentFactory.getMenuAndItems( ICEMail.getBundle(), "MainFrame.Help",
                                                    xlistener );

  // setup online help
    String     xurlstring = "org/icemail/mail/doc/help/help.hs";
    HelpBroker xhelpbroker = null;
    try {
      Class xclass = Class.forName( "javax.help.HelpSet" );
      ClassLoader xloader = MainFrame.class.getClassLoader();

      URL xurl = HelpSet.findHelpSet( xloader, xurlstring );
      if ( xurl == null ) {
        String xstring = ICEMail.getBundle().getString( "Exception.missingHelpURL" );
        throw new Exception( xstring );
      }

      HelpSet xhelpset = new HelpSet( xloader, xurl );

      xhelpbroker = xhelpset.createHelpBroker();
    } catch ( Exception ex ) {
      Object[] xargs = new Object[2];
      xargs[0] = xurlstring;
      xargs[1] = ex.toString();
      ComponentFactory.showDialog( ICEMail.getBundle(), "MainFrame.HelpError",
                                   0, JOptionPane.WARNING_MESSAGE, xargs );
    }
  
    int xitems = xmenu.getItemCount();
    JMenuItem xitem;
    for ( int xindex = 0; xindex < xitems; xindex++ ) {
      xitem = xmenu.getItem( xindex );
      if ( xitem != null && xitem.getActionCommand().equals( "JAVAHELP" ) ) {
        if ( xhelpbroker == null )
          xitem.setEnabled( false );
        else
          xitem.addActionListener( new CSH.DisplayHelpFromSource( xhelpbroker ) );
      }
    }

    menubar.add( xmenu );
  }

  private void
  addLookAndFeelMenu( JMenuBar mbar ) {
    if ( Package.DEBUG && Package.isTraceable( "MainFrame" ) ) {