// Fig. 14.12: DesktopTest.java
// Demonstrating JDesktopPane.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class DesktopTest extends JFrame {
   private JDesktopPane theDesktop;

   // set up GUI
   public DesktopTest()
   {
      super( "Using a JDesktopPane" );

      // create menu bar, menu and menu item
      JMenuBar bar = new JMenuBar();
      JMenu addMenu = new JMenu( "Add" );
      JMenuItem newFrame = new JMenuItem( "Internal Frame" );

      addMenu.add( newFrame );
      bar.add( addMenu );

      setJMenuBar( bar );

      // set up desktop
      theDesktop = new JDesktopPane();
      getContentPane().add( theDesktop );
    
      // set up listener for newFrame menu item
      newFrame.addActionListener(

         new ActionListener() {  // anonymous inner class

            // display new internal window
            public void actionPerformed( ActionEvent event ) {

               // create internal frame
               JInternalFrame frame = new JInternalFrame( 
                  "Internal Frame", true, true, true, true );

               // attach panel to internal frame content pane
               Container container = frame.getContentPane();
               MyJPanel panel = new MyJPanel();
               container.add( panel, BorderLayout.CENTER );

               // set size internal frame to size of its contents
               frame.pack();

               // attach internal frame to desktop and show it
               theDesktop.add( frame );
               frame.setVisible( true );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      setSize( 600, 460 );
      setVisible( true );

   } // end constructor

   public static void main( String args[] )
   {     
      DesktopTest application = new DesktopTest();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

} // end class DesktopTest

// class to display an ImageIcon on a panel
class MyJPanel extends JPanel {
   private ImageIcon imageIcon;
   private String[] images = { "yellowflowers.png", "purpleflowers.png",
      "redflowers.png", "redflowers2.png", "lavenderflowers.png" };

   // load image
   public MyJPanel()
   {
      int randomNumber = ( int ) ( Math.random() * 5 );
      imageIcon = new ImageIcon( images[ randomNumber ] );
   }

   // display imageIcon on panel
   public void paintComponent( Graphics g )
   {
      // call superclass paintComponent method
      super.paintComponent( g );

      // display icon
      imageIcon.paintIcon( this, g, 0, 0 );
   }

   // return image dimensions
   public Dimension getPreferredSize()
   {
      return new Dimension( imageIcon.getIconWidth(), 
         imageIcon.getIconHeight() );  
   }

} // end class MyJPanel

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 * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and               *
 * Prentice Hall. All Rights Reserved.                                    *
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