Name: nt126004 Date: 09/25/2001


java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b65)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b65, mixed mode)


Navigating through the JMenu(Bar) causes permanent focusGained, focuslost
events on JComponents, e.g. JTextField, placed in the contentPane of a JFrame.

When focus goes from a JTextField to a JMenu, the FocusListener of the
JTextField gets a temporary focus lost. While navigating through the JMenu
several focusLost and focusGained events ocured; not only when moving the mouse
cursor from one JMenu to another JMenu, but also when moving from a sub JMenu
which contents several JMenuItems to the super JMenu.
What I expect is that the focus always remains at the JMenu as long as I don't
leave the JMenu.

Example:
Execute the program.
Set the focus into the second Prename field.
Select with the mouse cursor the Management menu. The focusListener gets an
temporary focusLost event.
Then select the Management->act menu by moving the mouse cursor on this menu.
After that return the mouse cursor to the Management menu. The focusListener
gets a focusGained event.

event history:
FocusListener_1.focusLost() with Event :java.awt.event.FocusEvent
[FOCUS_LOST,temporary,opposite=javax.swing.JPopupMenu.......
caused by : javax.swing.JTextField[top panel_Feld_2,.......
FocusListener_1.focusGained() with event :java.awt.event.FocusEvent
[FOCUS_GAINED,permanent,opposite=javax.swing.JPopupMenu
caused by : javax.swing.JTextField[top panel_Feld_1,....
FocusListener_1.focusLost() with Event :java.awt.event.FocusEvent
[FOCUS_LOST,permanent,opposite=javax.swing.JPopupMenu
caused by : javax.swing.JTextField[top panel_Feld_1,.............

Example Program :

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


public class Application1 {
  boolean packFrame = false;

  /**Construct the application*/
  public Application1() {
    Frame1 frame = new Frame1();
    //Validate frames that have preset sizes
    //Pack frames that have useful preferred size info, e.g. from their layout
    if (packFrame) {
      frame.pack();
    }
    else {
      frame.validate();
    }
    //Center the window
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    if (frameSize.height > screenSize.height) {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {
      frameSize.width = screenSize.width;
    }
    frame.setLocation((screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }
  /**Main method*/
  public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new Application1();
  }
}


class Frame1 extends JFrame {
  JPanel contentPane;
  JMenuBar jMenuBar1 = new JMenuBar();
  JMenu jMenuFile = new JMenu();
  JMenuItem jMenuFileExit = new JMenuItem();
  JMenu jMenuVerwaltung = new JMenu();
  JMenu jMenuVerwaltungVorgang = new JMenu();
  JMenuItem jMenuItemVerwaltungVorgangDelete = new JMenuItem();

  JMenu jMenuHelp = new JMenu();
  JMenuItem jMenuHelpAbout = new JMenuItem();
  BorderLayout borderLayout1 = new BorderLayout();

  FocusListener fl_1;


  /**Construct the frame*/
  public Frame1() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    //setIconImage(Toolkit.getDefaultToolkit().createImage
(Frame1.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(600, 600));
    this.setTitle("FocusManager test");

    fl_1 = new FocusListener() {
      public void focusGained( FocusEvent e ) {
        System.out.println("FocusListener_1.focusGained() with event :");
        System.out.println( e.toString());
        System.out.println( "caused by : " + e.getSource() );
// Component comp = e.getOppositeComponent();
// if ( comp != null ) {
// System.out.println( "oppositeComponent = " + comp.getName() );
// }
      }

      public void focusLost( FocusEvent e ) {
        System.out.println("FocusListener_1.focusLost() with Event :");
        System.out.println(e);
        System.out.println( "caused by : " + e.getSource() );
// Component comp = e.getOppositeComponent();
// if ( comp != null ) {
// System.out.println( "oppositeComponent = " + comp.getName() );
// }

      }
    };

    JPanel topPanel = new oberesPanel("top panel", fl_1);
    contentPane.add( topPanel );

    jMenuFile.setText("File");
    jMenuFile.setName("File");
    jMenuFileExit.setText("Exit");
    jMenuFileExit.setName("File_Exit");
    jMenuFileExit.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jMenuFileExit_actionPerformed(e);
      }
    });

    jMenuVerwaltung.setText("Management");
    jMenuVerwaltung.setName("Management");
    jMenuVerwaltungVorgang.setText("act");
    jMenuVerwaltungVorgang.setName("Management_act");
    jMenuItemVerwaltungVorgangDelete.setText("delete");
    jMenuItemVerwaltungVorgangDelete.setName("delete");

    jMenuHelp.setText("Help");
    jMenuHelp.setName("Help");
    jMenuHelpAbout.setText("About");

    jMenuFile.add(jMenuFileExit);
    jMenuVerwaltung.add(jMenuVerwaltungVorgang);
    jMenuVerwaltungVorgang.add(jMenuItemVerwaltungVorgangDelete);

    jMenuHelp.add(jMenuHelpAbout);
    jMenuBar1.add(jMenuFile);
    jMenuBar1.add(jMenuVerwaltung);
    jMenuBar1.add(jMenuHelp);
    jMenuBar1.setName("MenuBar");
    this.setJMenuBar(jMenuBar1);
  }

  /**File | Exit action performed*/
  public void jMenuFileExit_actionPerformed(ActionEvent e) {
    System.exit(0);
  }

  /**Overridden so we can exit when window is closed*/
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      jMenuFileExit_actionPerformed(null);
    }
  }
}

class oberesPanel extends JPanel {
  JLabel jLabel1 = new JLabel();
  JLabel jLabel2 = new JLabel();
  JTextField jTextField1 = new JTextField();
  JLabel jLabel3 = new JLabel();
  JTextField jTextField2 = new JTextField();

  public oberesPanel(String text, FocusListener fl) {
    try {
      jbInit(text, fl);
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  private void jbInit(String text, FocusListener fl) throws Exception {

    jLabel1.setFont(new java.awt.Font("Dialog", 1, 16));
    jLabel1.setText(text);
    jLabel1.setBounds(new Rectangle(135, 12, 117, 17));
    this.setLayout(null);
    jLabel2.setText("Surname :");
    jLabel2.setBounds(new Rectangle(27, 48, 61, 17));
    jTextField1.setBounds(new Rectangle(99, 46, 170, 21));
    jTextField1.addFocusListener( fl );
    jTextField1.setName(text + "_Feld_1" );

    jLabel3.setText("Prename :");
    jLabel3.setBounds(new Rectangle(25, 93, 61, 17));
    jTextField2.setBounds(new Rectangle(100, 90, 170, 21));
    jTextField2.addFocusListener( fl );
    jTextField2.setName(text + "_Feld_2" );

    this.add(jLabel1, null);
    this.add(jLabel2, null);
    this.add(jTextField1, null);
    this.add(jLabel3, null);
    this.add(jTextField2, null);
  }


}
(Review ID: 131307)
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