Using Internal Frame Dialogs with JDesktopPane

Here’s a simple example that shows how this works. It also shows how you can make sure your container fills the desktop, even if the desktop changes size (since there’s no layout manager, this won’t happen automatically).

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

// A frame that can easily support internal frame dialogs
public class DialogDesktop extends JFrame {

public DialogDesktop(String title) {
super(title);
setDefaultCloseOperation(EXIT_ON_CLOSE);

final JDesktopPane desk = new JDesktopPane( );
setContentPane(desk);

// Create our “real” application container; use any layout manager we want.
final JPanel p = new JPanel(new GridBagLayout( ));

// Listen for desktop resize events so we can resize p. This will ensure that
// our container always fills the entire desktop.
desk.addComponentListener(new ComponentAdapter( ) {
public void componentResized(ComponentEvent ev) {
Dimension deskSize = desk.getSize( );
p.setBounds(0, 0, deskSize.width, deskSize.height);
p.validate( );
}
});

// Add our application panel to the desktop. Any layer below the MODAL_LAYER
// (where the dialogs will appear) is fine. We’ll just use the default in
// this example.
desk.add(p);

// Fill out our app with a few buttons that create dialogs.
JButton input = new JButton(”Input”);
JButton confirm = new JButton(”Confirm”);
JButton message = new JButton(”Message”);
p.add(input);
p.add(confirm);
p.add(message);

input.addActionListener(new ActionListener( ) {
public void actionPerformed(ActionEvent ev) {
JOptionPane.showInternalInputDialog(desk, “Enter Name”);
}
});

confirm.addActionListener(new ActionListener( ) {
public void actionPerformed(ActionEvent ev) {
JOptionPane.showInternalConfirmDialog(desk, “Is this OK?”);
}
});

message.addActionListener(new ActionListener( ) {
public void actionPerformed(ActionEvent ev) {
JOptionPane.showInternalMessageDialog(desk, “The End”);
}
});
}

// A simple test program
public static void main(String[] args) {
DialogDesktop td = new DialogDesktop(”Desktop”);
td.setSize(350, 250);
td.setVisible(true);
}

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