Jpopupmenu Bug/Glitch When Showing Submenu

jpopupmenuglitch

package org.dpsoftware;

import java.awt.AWTException;
import java.awt.Desktop;
import java.awt.Image;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URI;
import java.net.URISyntaxException;

import javax.swing.*;

/**
 * Main class of the Tray icon executable jar
 *
 * @author Sylvain Bugat
 *
 */
public class TrayIconMainClass {


   /** Load the tray icon image to display in the tray bar*/
   private static final Image TRAY_ICON_IMAGE = Toolkit.getDefaultToolkit().getImage( TrayIconMainClass.class.getClassLoader().getResource( "tray_play.png" ) ); //$NON-NLS-1$

   /**
    * Main program launched in the jar file
    *
    * @param args
    * @throws IOException
    */
   public static void main( final String args[] ) throws IOException{

      //Test if the system support the system tray
      if( SystemTray.isSupported() ) {

         //Try to use the system Look&Feel
         try {
            UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );
         }
         catch( final ClassNotFoundException exception ) {
            //If System Look&Feel is not supported, stay with the default one
         }
         catch( final InstantiationException exception ) {
            //If System Look&Feel is not supported, stay with the default one
         }
         catch( final IllegalAccessException exception ) {
            //If System Look&Feel is not supported, stay with the default one
         }
         catch( final UnsupportedLookAndFeelException exception ) {
            //If System Look&Feel is not supported, stay with the default one
         }

         //Add the icon  to the system tray
         final TrayIcon trayIcon = new TrayIcon( TRAY_ICON_IMAGE, "Tray icon skeleton" );
         trayIcon.setImageAutoSize( true );

         // Get the system default browser to open execution details
         final Desktop desktop = Desktop.getDesktop();

         //Action listener to get click on top menu items
         final ActionListener menuListener = new ActionListener() {
            @SuppressWarnings("synthetic-access")
            public void actionPerformed( final ActionEvent e) {

               if( JMenuItem.class.isInstance( e.getSource() ) ){

                  JMenuItem jMenuItem = (JMenuItem) e.getSource();
                  JOptionPane.showMessageDialog( null, "It works, you clicked on:" + System.lineSeparator() + jMenuItem.getText(), "Your skill is great!!", JOptionPane.INFORMATION_MESSAGE ); //$NON-NLS-1$
               }
            }
         };

         //About menu listener
         final ActionListener aboutListener = new ActionListener() {
            @SuppressWarnings("synthetic-access")
            public void actionPerformed( final ActionEvent e) {

               //Open an URL using the system default browser
               try {
                  final URI executionURI = new URI( "http://google.com" );
                  desktop.browse( executionURI );
               }
               catch( final URISyntaxException exception ) {

                  final StringWriter stringWriter = new StringWriter();
                  exception.printStackTrace( new PrintWriter( stringWriter ) );
                  JOptionPane.showMessageDialog( null, exception.getMessage() + System.lineSeparator() + stringWriter.toString(), "Tray icon skeleton redirection error", JOptionPane.ERROR_MESSAGE ); //$NON-NLS-1$
               }
               catch( final IOException exception ) {

                  final StringWriter stringWriter = new StringWriter();

                  exception.printStackTrace( new PrintWriter( stringWriter ) );
                  JOptionPane.showMessageDialog( null, exception.getMessage() + System.lineSeparator() + stringWriter.toString(), "Tray icon skeleton redirection error", JOptionPane.ERROR_MESSAGE ); //$NON-NLS-1$
               }
            }
         };

         //Get the system tray
         final SystemTray tray = SystemTray.getSystemTray();

         //Tray icon skeleton exit listener
         final ActionListener exitListener = new ActionListener() {
            @SuppressWarnings("synthetic-access")
            public void actionPerformed( final ActionEvent e) {
               //Important: remove the icon from the tray to dispose it
               tray.remove( trayIcon );
               System.exit( 0 );
            }
         };

         //Popup menu
         JPopupMenu.setDefaultLightWeightPopupEnabled( true );
         final JPopupMenu popupMenu = new JPopupMenu();

         JMenu aspectRatioSubMenu = new JMenu("Submenu");
         JMenuItem menuItem = new JMenuItem("Submenu item");
         aspectRatioSubMenu.add(menuItem);
         popupMenu.add(aspectRatioSubMenu);

         //Add 10 menu items
         for( int i = 0 ; i < 10 ; i++ ){
            final JMenuItem jMenuItem = new JMenuItem( "menu item " + i );
            popupMenu.add( jMenuItem );
            jMenuItem.addActionListener( menuListener );
         }

         //Adding some menu separator
         popupMenu.addSeparator();

         final JMenuItem aboutItem = new JMenuItem( "About Tray icon skeleton" ); //$NON-NLS-1$
         popupMenu.add( aboutItem );
         aboutItem.addActionListener( aboutListener );

         //Adding some menu separator
         popupMenu.addSeparator();

         //Quit menu to terminate the tray icon by disposing the tray icon
         final JMenuItem exitItem = new JMenuItem( "Quit" ); //$NON-NLS-1$
         popupMenu.add( exitItem );
         exitItem.addActionListener( exitListener );


         //Hidden dialog displayed behing the system tray to auto hide the popup menu when clicking somewhere else on the screen
         final JDialog hiddenDialog = new JDialog ();
         hiddenDialog.setSize( 10, 10 );

         //Listener based on the focus to auto hide the hidden dialog and the popup menu when the hidden dialog box lost focus
         hiddenDialog.addWindowFocusListener(new WindowFocusListener () {

            public void windowLostFocus ( final WindowEvent e ) {
               hiddenDialog.setVisible( false );
            }

            public void windowGainedFocus ( final WindowEvent e ) {
               //Nothing to do
            }
         });


         //Add a listener to display the popupmenu and the hidden dialog box when the tray icon is clicked
         trayIcon.addMouseListener( new MouseAdapter() {

            public void mouseReleased( final MouseEvent e) {

               if( e.isPopupTrigger() ) {
                  //Display the menu at the position of the mouse
                  //The dialog is also displayed at this position but it is behind the system tray
                  popupMenu.setLocation( e.getX(), e.getY() );
                  hiddenDialog.setLocation( e.getX(), e.getY() );

                  //Important: set the hidden dialog as the invoker to hide the menu with this dialog lost focus
                  popupMenu.setInvoker( hiddenDialog );
                  hiddenDialog.setVisible( true );
                  popupMenu.setVisible( true );
               }
            }
         });

         //Add the icon to the system tray
         try {
            tray.add( trayIcon );
         }
         catch ( final AWTException e ) {

            final StringWriter stringWriter = new StringWriter();
            e.printStackTrace( new PrintWriter( stringWriter ) );
            JOptionPane.showMessageDialog( null, "tray icon cannot be added to the system tray" + System.lineSeparator() + e.getMessage() + System.lineSeparator() + stringWriter.toString(), "Tray icon skeleton initialization error", JOptionPane.ERROR_MESSAGE ); //$NON-NLS-1$

            System.exit( 2 );
         }
      }
      else {
         //if the System is not compatible with SystemTray
         JOptionPane.showMessageDialog( null, "SystemTray cannot be initialized" + System.lineSeparator() + "this system is not compatible!", "Tray icon skeleton initialization error", JOptionPane.ERROR_MESSAGE ); //$NON-NLS-1$ //$NON-NLS-2$

         System.exit( 1 );
      }
   }
}