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How to create a virtual desktop in your application E-mail
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JDesktopPane

This Java Swing tip illustrates a method of using the background of your application as a virtual desktop. This code uses JDesktopPane which is a container (usually for JInternalFrames) that simulates a desktop. Typically, the user will create JInternalFrames and place them in a JDesktopPane. The user can then interact with JInternalFrames like they usually would with JFrames. The actions (minimize, maximize, close, etc) are done by using a DesktopManager that is associated with the JDesktopPane.

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class DesktopTest extends JFrame {
   public DesktopTest()
   {
      super"Using a JDesktopPane" );

      JMenuBar bar = new JMenuBar();
      JMenu addMenu = new JMenu"Add" );
      JMenuItem newFrame = new JMenuItem"Internal Frame" );
      addMenu.addnewFrame );      
      bar.addaddMenu );
      setJMenuBarbar );      

      final JDesktopPane theDesktop = new JDesktopPane();
      getContentPane().addtheDesktop );
    
      newFrame.addActionListener(
         new ActionListener() {
            public void actionPerformedActionEvent e ) {
               JInternalFrame frame =
                  new JInternalFrame(
                     "Internal Frame",
                     true, true, true, true );

               Container c = frame.getContentPane();
               MyJPanel panel = new MyJPanel();

               c.addpanel, BorderLayout.CENTER );
               frame.setSize(
                  panel.getImageWidthHeight().width,
                  panel.getImageWidthHeight().height );
               frame.setOpaquetrue );
               theDesktop.addframe );
            }
         }
      );

      setSize500400 );
      show();
   }

   public static void mainString args[] )
   {     
      DesktopTest app = new DesktopTest();

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosingWindowEvent e )
            {
               System.exit);
            }
         }
      );
   }
}

class MyJPanel extends JPanel {
    private ImageIcon imgIcon;

    public MyJPanel()
    {
       imgIcon = new ImageIcon"java-tip.gif" );
    }

    public void paintComponentGraphics g )
    {
       imgIcon.paintIconthis, g, 0);
    }

    public Dimension getImageWidthHeight()
    {
       return new DimensionimgIcon.getIconWidth(),
                             imgIcon.getIconHeight() );  
    }
}


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