componentframe.java

来自「一个用java写的mail.里面的代码值得我们去研究！学习。」· Java 代码 · 共 153 行

/*
** $Id: ComponentFrame.java,v 1.4 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.Component;
import java.awt.Dimension;
import java.awt.Rectangle;

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

import javax.activation.DataSource;
import javax.activation.MimeType;
import javax.activation.MimeTypeParseException;

import javax.swing.JFrame;


/**
 * This class provides a frame for all viewers.
 * <p>
 * Viewers for data sources (attachements) are instantiated via Java activation
 * based on the mimetypes in "icemailcap". The instantiated viewer (component)
 * is then placed placed within a frame and displayed.
 *
 * @see QuickViewer
 */
public class ComponentFrame
  extends JFrame
{
  private String    contentType_;

  /**
   * Construct a frame to display the given component, setting the title to the given name.
   * The source is used to save the layout of the window by type, i.e. type of source.
   * @param component the component to display
   * @param name the name of the Frame
   * @param source the data source of the component
   */
  public
  ComponentFrame( Component component, String name, DataSource source ) {
    super( name );

    try {
      MimeType mime = new MimeType( source.getContentType() );
      contentType_ = mime.getBaseType();
    } catch ( MimeTypeParseException ex ) {
      contentType_ = source.getContentType();
    }

    addWindowListener( new IWindowAdapter() );

    getContentPane().setLayout( new BorderLayout( 1, 1 ) );

    if ( component != null ) {
      getContentPane().add( component, BorderLayout.CENTER );
    }

    pack();

    loadLayoutProperties();
  }

  /**
   * Load the layout properties for this frame using the content type of the viewer.
   */
  private void
  loadLayoutProperties() {
    Rectangle defBounds = Configuration.getBounds( Configuration.P_ATTACH_WINDOW,
                                                   computeDefaultPosition() );
    Rectangle bounds = Configuration.getBounds( Configuration.PP_ATTACH_WINDOW +
                                                  contentType_.replace( '/', '.'),
                                                defBounds );
    setBounds( bounds );
  }

  /**
   * Save the layout properties for this frame using the content type of the viewer.
   */
  private void
  saveLayoutProperties() {
    Configuration.saveBounds( Configuration.PP_ATTACH_WINDOW + contentType_.replace( '/', '.'),
                              getBounds() );
  }

  /**
   * Compute a default position for the frame.
   *
   * @return the computed retangle of the frame
   */
  private Rectangle
  computeDefaultPosition() {
    Dimension sz = getSize();
    Dimension scrnSz = getToolkit().getScreenSize();

    if ( sz.width > (scrnSz.width - 10) ) sz.width = scrnSz.width - 10;
    if ( sz.height > (scrnSz.height - 10) ) sz.height = scrnSz.height - 10;

    int x = (scrnSz.width - sz.width) / 2;
    int y = (scrnSz.height - sz.height) / 3;

  // Make sure we are not off the screen.
    if ( x < 0 ) x = 0;
    if ( y < 0 ) y = 0;

  // Make sure we are not bigger than the screen.
    if ( x + sz.width > scrnSz.width ) sz.width = scrnSz.width - x;
    if ( y + sz.height > scrnSz.height ) sz.height = scrnSz.height - y;

    return new Rectangle( x, y, sz.width, sz.height );
  }

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

  /**
   * A internal class to handle the closing of window by the window manager,
   * disposing of the window properly.
   */
  private class IWindowAdapter
    extends WindowAdapter
  {
    public void
    windowClosing( WindowEvent event ) {
      saveLayoutProperties();
      event.getWindow().dispose();
    }
  }
}