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NullPointerException when asking for InternalFrameUI

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Old 07-30-07, 12:42 PM
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UnrealEd UnrealEd is offline
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NullPointerException when asking for InternalFrameUI
Hi,

As you might remember I was writing a modal JInternalFrame, about 2-3 months ago (check out this thread). Today I wanted to extend this class by a class who removes the titlebar from the JInternalFrame. I found a code snippet (see below) which does the trick, but now i'm facing some problems when I implement it into my extending class.

The code snippet to remove the titlebar:
Java Code:
  2.  
  3. setRootPaneCheckingEnabled(false);
  4. ((javax.swing.plaf.basic.BasicInternalFrameUI)frame.getUI()).setNorthPane(null);
My JInternalModalFrame class: (i removed the comments as they were in dutch
Java Code:
  1. package gui;
  2.  
  3. import java.awt.AWTEvent;
  4. import java.awt.ActiveEvent;
  5. import java.awt.Component;
  6. import java.awt.EventQueue;
  7. import java.awt.MenuComponent;
  8. import java.beans.PropertyVetoException;
  9.  
  10. import javax.swing.JFrame;
  11. import javax.swing.JInternalFrame;
  12. import javax.swing.JLayeredPane;
  13. import javax.swing.JPanel;
  14. import javax.swing.SwingUtilities;
  15. import javax.swing.event.MouseInputAdapter;
  16.  
  17. /**
  18.  * @author UnrealEd
  19.  * @version 25-apr-07 14:03:25
  20.  * @see JInternalFrame
  21.  */
  22. public class JInternalModalFrame extends JInternalFrame {
  23.  
  24.     private static final long serialVersionUID = 1L;
  25.  
  26.     private JLayeredPane modalLayeredPane;
  27.  
  28.     private JPanel modalGlass;
  29.  
  30.     public JInternalModalFrame(Component parent) {
  31.         this(parent, "");
  32.     }
  33.  
  34.     public JInternalModalFrame(Component parent, String title) {
  35.         this(parent, title, false);
  36.     }
  37.  
  38.     public JInternalModalFrame(Component parent, String title,
  39.             boolean resizeable) {
  40.         this(parent, title, resizeable, true);
  41.     }
  42.  
  43.     public JInternalModalFrame(Component parent, String title,
  44.             boolean resizeable, boolean closeable) {
  45.         this(parent, title, resizeable, closeable, false);
  46.     }
  47.  
  48.     public JInternalModalFrame(Component parent, String title,
  49.             boolean resizeable, boolean closeable, boolean maximizeable) {
  50.         this(parent, title, resizeable, closeable, maximizeable, false);
  51.     }
  52.  
  53.     public JInternalModalFrame(Component parent, String title,
  54.             boolean resizeable, boolean closeable, boolean maximizeable,
  55.             boolean iconifiable) {
  56.         super(title, resizeable, closeable, maximizeable, iconifiable);
  57.  
  58.         if (parent instanceof JFrame) {
  59.             setModalLayeredPane(((JFrame) parent).getLayeredPane());
  60.         } else {
  61.             setModalLayeredPane(JLayeredPane.getLayeredPaneAbove(parent));
  62.         }
  63.         createGlass();
  64.  
  65.         // putClientProperty("JInternalFrame.frameType", "optionDialog");
  66.         try {
  67.             setSelected(true);
  68.         } catch (PropertyVetoException ignored) {
  69.         }
  70.  
  71.         updateUI();
  72.     }
  73.  
  74.     private void createGlass() {
  75.         JPanel modalGlass = new JPanel();
  76.         modalGlass.setOpaque(false);
  77.         MouseInputAdapter adap = new MouseInputAdapter() {
  78.         };
  79.         modalGlass.addMouseListener(adap);
  80.         modalGlass.addMouseMotionListener(adap);
  81.         modalGlass.add(this);
  82.         modalGlass.setBounds(0, 0, getModalLayeredPane().getWidth(),
  83.                 getModalLayeredPane().getHeight());
  84.         modalGlass.setVisible(true);
  85.         setModalGlass(modalGlass);
  86.         getModalLayeredPane().setLayer(getModalGlass(),
  87.                 JLayeredPane.MODAL_LAYER);
  88.         getModalLayeredPane().add(getModalGlass());
  89.         toFront();
  90.     }
  91.  
  92.     public void dispose() {
  93.         super.dispose();
  94.         modalGlass.remove(this);
  95.         getLayeredPane().remove(modalGlass);
  96.         getLayeredPane().repaint();
  97.     }
  98.  
  99.     public void show() {
  100.         super.show();
  101.         startModal();
  102.     }
  103.  
  104.     public void setVisible(boolean isVisible) {
  105.         super.setVisible(isVisible);
  106.         if (isVisible) {
  107.             startModal();
  108.         } else {
  109.             stopModal();
  110.         }
  111.     }
  112.  
  113.     private synchronized void startModal() {
  114.         try {
  115.             if (SwingUtilities.isEventDispatchThread()) {
  116.                 EventQueue theQueue = getToolkit().getSystemEventQueue();
  117.                 while (isVisible()) {
  118.                     modalGlass.setBounds(0, 0, modalLayeredPane.getWidth(),
  119.                             modalLayeredPane.getHeight());
  120.                     AWTEvent event = theQueue.getNextEvent();
  121.                     Object source = event.getSource();
  122.                     if (event instanceof ActiveEvent) {
  123.                         ((ActiveEvent) event).dispatch();
  124.                     } else if (source instanceof Component) {
  125.                         ((Component) source).dispatchEvent(event);
  126.                     } else if (source instanceof MenuComponent) {
  127.                         ((MenuComponent) source).dispatchEvent(event);
  128.                     } else {
  129.                         System.err.println("Unable to dispatch: " + event);
  130.  
  131.                     }
  132.                 }
  133.             } else {
  134.                 Thread.yield();
  135.             }
  136.         } catch (InterruptedException ignored) {
  137.         } finally {
  138.             dispose();
  139.         }
  140.     }
  141.  
  142.     private synchronized void stopModal() {
  143.         notifyAll();
  144.     }
  145.  
  146.     public JPanel getModalGlass() {
  147.         return modalGlass;
  148.     }
  149.  
  150.     private void setModalGlass(JPanel modalGlass) {
  151.         this.modalGlass = modalGlass;
  152.     }
  153.  
  154.     public JLayeredPane getModalLayeredPane() {
  155.         return modalLayeredPane;
  156.     }
  157.  
  158.     private void setModalLayeredPane(JLayeredPane modalLayeredPane) {
  159.         this.modalLayeredPane = modalLayeredPane;
  160.     }
  161. }
And eventually, the JInternalTitlelessFrame:
Java Code:
  1. package gui;
  2.  
  3. import java.awt.BorderLayout;
  4. import java.awt.Component;
  5. import java.awt.Container;
  6. import java.awt.event.ActionEvent;
  7. import java.awt.event.ActionListener;
  8.  
  9. import javax.swing.JButton;
  10. import javax.swing.JComponent;
  11. import javax.swing.JDesktopPane;
  12. import javax.swing.JFrame;
  13. import javax.swing.JInternalFrame;
  14. import javax.swing.JLabel;
  15. import javax.swing.JPanel;
  16. import javax.swing.plaf.basic.BasicInternalFrameUI;
  17.  
  18. public class JInternalTitlelessFrame extends JInternalModalFrame {
  19.  
  20.     private static final long serialVersionUID = 1L;
  21.  
  22.     private static final String emptyTitle = "";
  23.  
  24.     private JComponent northPane;
  25.  
  26.     public JInternalTitlelessFrame(Component parent) {
  27.         this(parent, false);
  28.     }
  29.  
  30.     public JInternalTitlelessFrame(Component parent, boolean resizeable) {
  31.         super(parent, emptyTitle, resizeable);
  32.     }
  33.  
  34.     public void dispose() {
  35.         super.dispose();
  36.     }
  37.  
  38.     public void show() {
  39.         super.show();
  40.         setNorthPane(((BasicInternalFrameUI) getUI()).getNorthPane());
  41.         setRootPaneCheckingEnabled(false);
  42.         ((BasicInternalFrameUI) getUI()).setNorthPane(null);
  43.     }
  44.  
  45.     public void setVisible(boolean isVisible) {
  46.         super.setVisible(isVisible);
  47.         setNorthPane(((BasicInternalFrameUI) getUI()).getNorthPane());
  48.         if (isVisible) {
  49.             setRootPaneCheckingEnabled(false);
  50.             ((BasicInternalFrameUI) getUI()).setNorthPane(null);
  51.         } else {
  52.             ((BasicInternalFrameUI) getUI()).setNorthPane(getNorthPane());
  53.         }
  54.     }
  55.  
  56.     private JComponent getNorthPane() {
  57.         return northPane;
  58.     }
  59.  
  60.     private void setNorthPane(JComponent northPane) {
  61.         this.northPane = northPane;
  62.     }
  63.  
  64.     public static void main(String[] args) {
  65.         final JFrame frame = new JFrame("Modal Internal Frame");
  66.         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  67.  
  68.         final JDesktopPane desktop = new JDesktopPane();
  69.  
  70.         final JInternalFrame internal = new JInternalFrame("Opener");
  71.  
  72.         ActionListener showModal = new ActionListener() {
  73.             public void actionPerformed(ActionEvent e) {
  74.                 final JInternalTitlelessFrame modal = new JInternalTitlelessFrame(
  75.                         frame, true);
  76.  
  77.                 modal.setContentPane(new JPanel());
  78.                 JLabel lb = new JLabel("This is just a test");
  79.                 modal.add("message", lb);
  80.  
  81.                 JButton b = new JButton("click me ;)");
  82.                 ActionListener s = new ActionListener() {
  83.                     public void actionPerformed(ActionEvent arg0) {
  84.                         System.out.println("Goopa! Goopa!");
  85.                         modal.dispose();
  86.                     }
  87.  
  88.                 };
  89.                 b.addActionListener(s);
  90.                 modal.add("button", b);
  91.                 b = new JButton("Close");
  92.                 b.addActionListener(s);
  93.                 modal.add("button", b);
  94.                 lb = new JLabel("body test");
  95.                 b = new JButton("body btn");
  96.                 modal.add("body", lb);
  97.                 modal.add("body", b);
  98.                 modal.add("body", lb);
  99.                 modal.add("body", b);
  100.                 modal.setSize(300, 300);
  101.                 modal.setVisible(true);
  102.                 desktop.add(modal);
  103.                 System.out.println("output__");
  104.             }
  105.         };
  106.         desktop.add(internal);
  107.         JButton button = new JButton("Open");
  108.         button.addActionListener(showModal);
  109.  
  110.         Container iContent = internal.getContentPane();
  111.         iContent.add(button, BorderLayout.CENTER);
  112.         internal.setBounds(25, 25, 200, 100);
  113.         internal.setVisible(true);
  114.  
  115.         Container content = frame.getContentPane();
  116.         content.add(desktop, BorderLayout.CENTER);
  117.         frame.setSize(500, 300);
  118.         frame.setVisible(true);
  119.     }
  120. }
Now the problem : Whenever i try to run the above code (the main method), it throws a NullPointerException at this line:
Java Code:
  1. setNorthPane(((BasicInternalFrameUI) getUI()).getNorthPane());
in the JInternalTitlessFrame::setVisible method. For some reason no UI is set when I try to create a modal frame. Can anyone see why this happens? I've been staring at it for hours, but I can't find it (I have very little knowledge when it comes to UIs, and how Swing works).

A second problem i'm facing is the fact that whenever i resize the JInternalTitlelessFrame or the JInternalModalFrame, the frame automatically jumps back to the default entered size. As far as i can see i didn't set anything specific to get this efect, but can anyone see what i'm doing wrong?

Many thanx in advance
cheers
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Old 07-30-07, 06:33 PM
King Coder King Coder is offline
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It looks like there is no InternalFrameUI returned by getUI(), which is why you are getting the null pointer exception. Maybe it's not initialized in the InternalFrames or it's possibly a platform issue... I don't know exactly. You can fix this by calling updateUI() or setUI(InternalFrameUI). The first method is the easiest, but both work.
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Old 08-04-07, 12:35 PM
UnrealEd's Avatar
UnrealEd UnrealEd is offline
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sorry for the delay, but i was kinda busy lately

I tried what you suggested, and it fixed the NullPointerException. However, the northpane wasn't removed when the JInternalFrame was displayed. After some experimenting i finally found a solution: i now make a call for the setVisible method of the parent after i removed the northpane. I don't know why this solves the problem, i don't even know why if it's the proper way of coding, but it works

I also fixed the second problem i had (the one where i can't move/resize the JInternalFrame). I simply had to change the modalGlass to a JDesktopPane instead of a JPanel (JPanel always uses the minimumLayoutSize ? ).

While these problems are all solved, i'm facing a new one . This time i can't create a JInternalTitlelessFrame on a JFrame immediately. The reason i specify the immediately is because it does work when i create the JInternalTitlelessFrame in an ActionEvent (actionPerformed) of a JButton which i place in the JFrame. Here's a sample of the code that does work:
Java Code:
  1. package gui.components;
  2.  
  3. import java.awt.BorderLayout;
  4. import java.awt.Container;
  5. import java.awt.event.ActionEvent;
  6. import java.awt.event.ActionListener;
  7.  
  8. import gui.components.JInternalTitlelessFrame;
  9.  
  10. import javax.swing.JButton;
  11. import javax.swing.JDesktopPane;
  12. import javax.swing.JFrame;
  13. import javax.swing.JInternalFrame;
  14. import javax.swing.JLabel;
  15. import javax.swing.JPanel;
  16.  
  17. public class TitlelessFrameTest {
  18.  
  19.     public static void main(String[] args) {
  20.         final JFrame frame = new JFrame("Modal Internal Frame");
  21.         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  22.         frame.setVisible(true);
  23.  
  24.         final JDesktopPane desktop = new JDesktopPane();
  25.  
  26.         final JInternalFrame internal = new JInternalFrame("Opener");
  27.  
  28.         ActionListener showModal = new ActionListener() {
  29.             public void actionPerformed(ActionEvent e) {
  30.                 final JInternalTitlelessFrame modal = new JInternalTitlelessFrame(frame, JInternalTitlelessFrame.CENTER_BOTH);
  31.  
  32.                 modal.setContentPane(new JPanel());
  33.                 JLabel lb = new JLabel("This is just a test");
  34.                 modal.add("message", lb);
  35.  
  36.                 JButton b = new JButton("click me ;)");
  37.                 ActionListener s = new ActionListener() {
  38.                     public void actionPerformed(ActionEvent arg0) {
  39.                         System.out.println("Goopa! Goopa!");
  40.                         modal.dispose();
  41.                     }
  42.  
  43.                 };
  44.                 b.addActionListener(s);
  45.                 modal.add("button", b);
  46.                 b = new JButton("Close");
  47.                 b.addActionListener(s);
  48.                 modal.add("button", b);
  49.                 lb = new JLabel("body test");
  50.                 b = new JButton("body btn");
  51.                 modal.add("body", lb);
  52.                 modal.add("body", b);
  53.                 modal.add("body", lb);
  54.                 modal.add("body", b);
  55.                 modal.setSize(200, 100);
  56.                 modal.setVisible(true);
  57.                 System.out.println("hello");
  58.             }
  59.         };
  60.         desktop.add(internal);
  61.         JButton button = new JButton("Open");
  62.         button.addActionListener(showModal);
  63.  
  64.         Container iContent = internal.getContentPane();
  65.         iContent.add(button, BorderLayout.CENTER);
  66.         internal.setBounds(25, 25, 200, 100);
  67.         internal.setVisible(true);
  68.  
  69.         Container content = frame.getContentPane();
  70.         content.add(desktop, BorderLayout.CENTER);
  71.         frame.setSize(500, 300);
  72.         frame.setVisible(true);
  73.     }
  74. }
and here's a code snippet that doesn't work:
Java Code:
  1. package gui.components;
  2.  
  3. import gui.components.JInternalTitlelessFrame;
  4.  
  5. import javax.swing.JPanel;
  6. import javax.swing.JDesktopPane;
  7. import javax.swing.JFrame;
  8. import javax.swing.JLabel;
  9. import javax.swing.JTextField;
  10. import javax.swing.JPasswordField;
  11.  
  12. class TitlelessFrameTest2 {
  13.  
  14.     public static void main (String[] args) {
  15.         JFrame jf = new JFrame();
  16.         jf.setSize(400, 300);
  17.         jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  18.         jf.setContentPane(new JDesktopPane());
  19.  
  20.         JInternalTitlelessFrame loginWindow = new JInternalTitlelessFrame(jf,
  21.                 JInternalTitlelessFrame.CENTER_BOTH);
  22.         loginWindow.setBounds(10, 10, 200, 100);
  23.         loginWindow.setContentPane(new JPanel());
  24.  
  25.         // place Components on window
  26.         JLabel loginAttempt = new JLabel();
  27.         GregorianCalendar gc = new GregorianCalendar();
  28.         String date = gc.get(GregorianCalendar.DAY_OF_MONTH) + "/";
  29.         date += gc.get(GregorianCalendar.MONTH) + "/";
  30.         date += gc.get(GregorianCalendar.YEAR);
  31.         loginAttempt.setText("Login attempt at: " + date);
  32.         loginWindow.add(loginAttempt);
  33.  
  34.         loginWindow.add(new JLabel("username:"));
  35.         loginWindow.add(new JTextField(30));
  36.  
  37.         loginWindow.add(new JLabel("password:"));
  38.         loginWindow.add(new JPasswordField(30));
  39.  
  40.         loginWindow.add(new JButton("Login"));
  41.         loginWindow.setVisible(true);
  42.         
  43.         jf.setVisible(true);
  44.     }
  45. }
When i run the second code, the JFrame is not accessible anymore (as expected as the JInternalTitlelessFrame is a modal JInternalFrame), but the JInternalFrame doesn't appear.

Here are the update JInternalModalFrame and JInternalTitlelessFrame in case you want to test it yourself:
Java Code:
  1. package gui.components;
  2.  
  3. import java.awt.Component;
  4. import javax.swing.plaf.basic.BasicInternalFrameUI;
  5.  
  6. /**
  7.  * @author UnrealEd
  8.  * @version 01-aug-07 15:33:56
  9.  */
  10. public class JInternalTitlelessFrame extends JInternalModalFrame {
  11.  
  12.     /** COMMENT ME! */
  13.     private static final long serialVersionUID = 1L;
  14.  
  15.     private static final String emptyTitle = "";
  16.  
  17.     public static final int CENTER_NOTHING = 0;
  18.  
  19.     public static final int CENTER_VERTICAL = 1;
  20.  
  21.     public static final int CENTER_HORIZONTAL = 2;
  22.  
  23.     public static final int CENTER_BOTH = 3;
  24.  
  25.     private int center = CENTER_NOTHING;
  26.  
  27.     public JInternalTitlelessFrame(Component parent) {
  28.         this(parent, CENTER_NOTHING);
  29.     }
  30.  
  31.     public JInternalTitlelessFrame(Component parent, int center) {
  32.         this(parent, center, false);
  33.     }
  34.  
  35.     public JInternalTitlelessFrame(Component parent, int center,
  36.             boolean resizeable) {
  37.         super(parent, emptyTitle, resizeable);
  38.         setCenter(center);
  39.         setAbsoluteLocation();
  40.     }
  41.  
  42.     public void dispose() {
  43.         super.dispose();
  44.     }
  45.  
  46.     private int getCenter() {
  47.         return center;
  48.     }
  49.  
  50.     private void setAbsoluteLocation() {
  51.         Component parent = getModalGlass();
  52.         if ((getCenter() & CENTER_HORIZONTAL) == CENTER_HORIZONTAL) {
  53.             int init_x = Math.round((parent.getWidth() - getWidth()) / 2);
  54.             setLocation(init_x, getY());
  55.         }
  56.         if ((getCenter() & CENTER_VERTICAL) == CENTER_VERTICAL) {
  57.             int init_y = Math.round((parent.getHeight() - getHeight()) / 2);
  58.             setLocation(getX(), init_y);
  59.         }
  60.  
  61.     }
  62.  
  63.     private void setCenter(int center) {
  64.         this.center = center;
  65.     }
  66.  
  67.     public void setVisible(boolean isVisible) {
  68.         setRootPaneCheckingEnabled(false);
  69.         setAbsoluteLocation();
  70.         try {
  71.             if (((BasicInternalFrameUI) getUI()).getNorthPane() != null) {
  72.                 ((BasicInternalFrameUI) getUI()).setNorthPane(null);
  73.             }
  74.         } catch (NullPointerException e) {
  75.         }
  76.         super.setVisible(isVisible);
  77.     }
  78.  
  79.     public void show() {
  80.         super.show();
  81.         setRootPaneCheckingEnabled(false);
  82.         try {
  83.             ((BasicInternalFrameUI) getUI()).setNorthPane(null);
  84.         } catch (NullPointerException e) {
  85.         }
  86.     }
  87. }
Java Code:
  1. package gui.components;
  2.  
  3. import java.awt.AWTEvent;
  4. import java.awt.ActiveEvent;
  5. import java.awt.Component;
  6. import java.awt.EventQueue;
  7. import java.awt.MenuComponent;
  8. import java.beans.PropertyVetoException;
  9.  
  10. import javax.swing.JDesktopPane;
  11. import javax.swing.JFrame;
  12. import javax.swing.JInternalFrame;
  13. import javax.swing.JLayeredPane;
  14. import javax.swing.SwingUtilities;
  15. import javax.swing.event.MouseInputAdapter;
  16.  
  17. /**
  18.  * @author UnrealEd
  19.  * @version 31-jul-07 18:13:57
  20.  * @see JInternalFrame
  21.  */
  22. public class JInternalModalFrame extends JInternalFrame {
  23.  
  24.     /** COMMENT ME! */
  25.     private static final long serialVersionUID = 1L;
  26.  
  27.     private JLayeredPane modalLayeredPane;
  28.  
  29.     private JDesktopPane modalGlass;
  30.  
  31.     public JInternalModalFrame(Component parent) {
  32.         this(parent, "");
  33.     }
  34.  
  35.     public JInternalModalFrame(Component parent, String title) {
  36.         this(parent, title, false);
  37.     }
  38.  
  39.     public JInternalModalFrame(Component parent, String title,
  40.             boolean resizeable) {
  41.         this(parent, title, resizeable, true);
  42.     }
  43.  
  44.     public JInternalModalFrame(Component parent, String title,
  45.             boolean resizeable, boolean closeable) {
  46.         this(parent, title, resizeable, closeable, false);
  47.     }
  48.  
  49.     public JInternalModalFrame(Component parent, String title,
  50.             boolean resizeable, boolean closeable, boolean maximizeable) {
  51.         this(parent, title, resizeable, closeable, maximizeable, false);
  52.     }
  53.  
  54.     public JInternalModalFrame(Component parent, String title,
  55.             boolean resizeable, boolean closeable, boolean maximizeable,
  56.             boolean iconifiable) {
  57.         super(title, resizeable, closeable, maximizeable, iconifiable);
  58.  
  59.         if (parent instanceof JFrame) {
  60.             setModalLayeredPane(((JFrame) parent).getLayeredPane());
  61.         } else {
  62.             setModalLayeredPane(JLayeredPane.getLayeredPaneAbove(parent));
  63.         }
  64.         createGlass();
  65.  
  66.         //putClientProperty("JInternalFrame.frameType", "optionDialog");
  67.         try {
  68.             setSelected(true);
  69.         } catch (PropertyVetoException ignored) {
  70.         }
  71.     }
  72.  
  73.     private void createGlass() {
  74.         JDesktopPane modalGlass = new JDesktopPane();
  75.         modalGlass.setOpaque(false);
  76.         MouseInputAdapter adap = new MouseInputAdapter() {
  77.         };
  78.         modalGlass.addMouseListener(adap);
  79.         modalGlass.addMouseMotionListener(adap);
  80.         modalGlass.add(this);
  81.         modalGlass.setBounds(0, 0, getModalLayeredPane().getWidth(),
  82.                 getModalLayeredPane().getHeight());
  83.         modalGlass.setVisible(true);
  84.         setModalGlass(modalGlass);
  85.         getModalLayeredPane().setLayer(modalGlass, JLayeredPane.MODAL_LAYER);
  86.         getModalLayeredPane().add(modalGlass);
  87.         toFront();
  88.     }
  89.  
  90.     public void dispose() {
  91.         super.dispose();
  92.         getModalGlass().remove(this);
  93.         getModalLayeredPane().remove(getModalGlass());
  94.         getModalLayeredPane().repaint();
  95.     }
  96.  
  97.     public void show() {
  98.         super.show();
  99.         startModal();
  100.     }
  101.  
  102.     public void setVisible(boolean isVisible) {
  103.         super.setVisible(isVisible);
  104.         if (isVisible) {
  105.             startModal();
  106.         } else {
  107.             stopModal();
  108.         }
  109.     }
  110.  
  111.     private synchronized void startModal() {
  112.         try {
  113.             if (SwingUtilities.isEventDispatchThread()) {
  114.                 EventQueue theQueue = getToolkit().getSystemEventQueue();
  115.                 while (isVisible()) {
  116.                     getModalGlass().setBounds(0, 0,
  117.                             getModalLayeredPane().getWidth(),
  118.                             getModalLayeredPane().getHeight());
  119.                     AWTEvent event = theQueue.getNextEvent();
  120.                     Object source = event.getSource();
  121.                     if (event instanceof ActiveEvent) {
  122.                         ((ActiveEvent) event).dispatch();
  123.                     } else if (source instanceof Component) {
  124.                         ((Component) source).dispatchEvent(event);
  125.                     } else if (source instanceof MenuComponent) {
  126.                         ((MenuComponent) source).dispatchEvent(event);
  127.                     } else {
  128.                         System.err.println("Unable to dispatch: " + event);
  129.                     }
  130.                 }
  131.             } else {
  132.                 Thread.yield();
  133.             }
  134.         } catch (InterruptedException ignored) {
  135.         } finally {
  136.             dispose();
  137.         }
  138.     }
  139.  
  140.     private synchronized void stopModal() {
  141.         notifyAll();
  142.     }
  143.  
  144.     protected JLayeredPane getModalLayeredPane() {
  145.         return modalLayeredPane;
  146.     }
  147.  
  148.     private void setModalLayeredPane(JLayeredPane modalLayeredPane) {
  149.         this.modalLayeredPane = modalLayeredPane;
  150.     }
  151.  
  152.     protected JDesktopPane getModalGlass() {
  153.         return modalGlass;
  154.     }
  155.  
  156.     private void setModalGlass(JDesktopPane modalGlass) {
  157.         this.modalGlass = modalGlass;
  158.     }
  159. }

I know this thread is quite long, so thanks again for your time
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"Good judgement comes from experience, and experience comes from bad judgement." - Fred Brooks

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