Secure Desktop Mode effect for java application

We use JXLayer for this exact purpose…

This is really useful as it locks the user out of the given container without locking the out of the application like a GlassPane solution does. It’s like a glass pane for containers 😉

I stole the basic idea for here

 public class JXLayerTest {

      public static void main(String[] args) {
           new JXLayerTest();
      }

      public JXLayerTest() {
           EventQueue.invokeLater(new Runnable() {
                @Override
                public void run() {
                     try {
                          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                     } catch (ClassNotFoundException ex) {
                     } catch (InstantiationException ex) {
                     } catch (IllegalAccessException ex) {
                     } catch (UnsupportedLookAndFeelException ex) {
                     }

                     final LockableUI ui = new LockableUI();
                     JPanel panel = new JPanel(new GridBagLayout());
                     buildUI(panel);

                     // This stolen directly from the JXLayer lockable blog                         
                     JXLayer layer = new JXLayer(panel, ui);

                     // Java2D grayScale BufferedImageOp
                     ColorConvertOp grayScale = new ColorConvertOp(ColorSpace.getInstance(ColorSpace.CS_GRAY), null);
                     // wrap it with the jxlayer's BufferedImageOpEffect 
                     BufferedImageOpEffect effect = new BufferedImageOpEffect(grayScale);
                     // set it as the locked effect        
                     ui.setLockedEffects(effect);
                     ui.setLocked(false);

                     JFrame frame = new JFrame();
                     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                     frame.setLayout(new BorderLayout());
                     frame.add(layer);

                     JPanel panelButtons = new JPanel(new GridBagLayout());

                     final JButton lock = new JButton("Lock");
                     lock.addActionListener(new ActionListener() {
                          @Override
                          public void actionPerformed(ActionEvent e) {
                               boolean locked = !ui.isLocked();
                               ui.setLocked(locked);
                               lock.setText(locked ? "Unlock" : "Lock");

                          }
                     });

                     panelButtons.add(lock);
                     frame.add(panelButtons, BorderLayout.SOUTH);

                     frame.pack();
                     frame.setLocationRelativeTo(null);
                     frame.setVisible(true);
                }

                protected void buildUI(JPanel panel) {
                     GridBagConstraints gbc = new GridBagConstraints();
                     gbc.gridx = 0;
                     gbc.gridy = 0;

                     JLabel label = new JLabel();
                     try {
                          BufferedImage image = ImageIO.read(new File("megatokyo.png"));
                          label.setIcon(new ImageIcon(image));
                     } catch (IOException ex) {
                          label.setText("Nothing to see here");
                     }

                     panel.add(label, gbc);

                     JButton button = new JButton("Clickl me");
                     button.addActionListener(new ActionListener() {
                          @Override
                          public void actionPerformed(ActionEvent e) {
                               JOptionPane.showMessageDialog(null, "Clicked");
                          }
                     });

                     gbc.gridy++;
                     panel.add(button, gbc);

                }
           });
      }
 }