// Fig. 22.11: DesktopFrame.java
// Demonstrating JDesktopPane.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JDesktopPane;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.ImageIcon;
public class DesktopFrame extends JFrame
{
private JDesktopPane theDesktop;
// set up GUI
public DesktopFrame()
{
super( "Using a JDesktopPane" );
JMenuBar bar = new JMenuBar(); // create menu bar
JMenu addMenu = new JMenu( "Add" ); // create Add menu
JMenuItem newFrame = new JMenuItem( "Internal Frame" );
addMenu.add( newFrame ); // add new frame item to Add menu
bar.add( addMenu ); // add Add menu to menu bar
setJMenuBar( bar ); // set menu bar for this application
theDesktop = new JDesktopPane(); // create desktop pane
add( theDesktop ); // add desktop pane to frame
// 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 );
MyJPanel panel = new MyJPanel(); // create new panel
frame.add( panel, BorderLayout.CENTER ); // add panel
frame.pack(); // set internal frame to size of contents
theDesktop.add( frame ); // attach internal frame
frame.setVisible( true ); // show internal frame
} // end method actionPerformed
} // end anonymous inner class
); // end call to addActionListener
} // end constructor DesktopFrame
} // end class DesktopFrame
// class to display an ImageIcon on a panel
class MyJPanel extends JPanel
{
private static Random generator = new Random();
private ImageIcon picture; // image to be displayed
private String[] images = { "yellowflowers.png", "purpleflowers.png",
"redflowers.png", "redflowers2.png", "lavenderflowers.png" };
// load image
public MyJPanel()
{
int randomNumber = generator.nextInt( 5 );
picture = new ImageIcon( images[ randomNumber ] ); // set icon
} // end MyJPanel constructor
// display imageIcon on panel
public void paintComponent( Graphics g )
{
super.paintComponent( g );
picture.paintIcon( this, g, 0, 0 ); // display icon
} // end method paintComponent
// return image dimensions
public Dimension getPreferredSize()
{
return new Dimension( picture.getIconWidth(),
picture.getIconHeight() );
} // end method getPreferredSize
} // end class MyJPanel
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* (C) Copyright 1992-2005 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
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