Problems with 'background' JFrame focus when adding a modal JDialog

Hi all
I am trying to add a modal JDialog to my JFrame (to use for the data entry), even if I have problems with the JFrame "focus". Basically, at the moment my program starts the JFrame and JDialog (loading program) very well. But then - if I move to another program (say, my browser) and then I try to go back to my program, it only shows the JDialog and the main JFrame is nowhere to be seen.

In many ways the functionality I'm looking for is that of notebook: when you open the Find/Replace box (even though it is not modal), you can switch to another program, and then when you switch again Notepad the two main frame and "JDialog" - esque box is always on display.

I tried to make it work for a couple of hours, but can't seem to. The closest I got is to add a WindowFocusListener for my JDialog and I hide it via setVisible once triggered windowLostFocus() (then my plan was to implement a feature similar in my class JFrame--though with windowGainedFocus - to redisplay the JDialog, i.e. once the user switches to the program). Unfortunately, this doesn't seem to work; I can't seem to get any window or window focus listeners actually pull all methods, in fact?

I hope that this kind of sense lol. In short, I'm looking for the Notepad CTRL + R-esque functionality, but with a modal box. With regard to a 'short ': code list

Main.Java

// Not all of these required for the code excerpt of course.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
import java.awt.event.WindowListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import javax.swing.UIManager;
import javax.swing.plaf.basic.BasicSplitPaneDivider;
import javax.swing.plaf.basic.BasicSplitPaneUI;

public class Main extends JFrame implements ActionListener, WindowFocusListener, WindowListener, FocusListener {

     static JFrame frame;
     private static int programWidth;
     private static int programHeight;
     private static int minimumProgramWidth = 700;
     private static int minimumProgramHeight = 550;
     public static SetupProject setupProjectDialog;


     public Main() {

          // Setup the overall GUI of the program
          // ...
          
     }

     private static void createSetupProjectDialog() {
          // Now open the 'Setup Your Project' dialog box
          // !!! Naturally this wouldn't auto-open on load if the user has already created a project
          setupProjectDialog = new SetupProject( frame, "Create Your Website Project", true );

          // Okay, for this we want it to be (say) 70% of the progamWidth/height, OR *slightly* (-25px) smaller than the minimum size of 700/550
          // Change (base on programWidth/Height) then setLocation
          int currProgramWidth = getProgramWidth();
          int currProgramHeight = getProgramHeight();
          int possibleWidth = (int) (currProgramWidth * 0.7);
          int possibleHeight = (int) (currProgramHeight * 0.7);

          // Set the size and location of the JDialog as needed
          if( (possibleWidth > (minimumProgramWidth-25)) && (possibleHeight > (minimumProgramHeight-25)) ) {
               setupProjectDialog.setPreferredSize( new Dimension(possibleWidth,possibleHeight) );
               setupProjectDialog.setLocation( ((currProgramWidth/2)-(possibleWidth/2)), ((currProgramHeight/2)-(possibleHeight/2)) );
          }

           else {
               setupProjectDialog.setPreferredSize( new Dimension( (minimumProgramWidth-25), (minimumProgramHeight-25)) );
               setupProjectDialog.setLocation( ((currProgramWidth/2)-((minimumProgramWidth-25)/2)), ((currProgramHeight/2)-((minimumProgramHeight-25)/2)) );
           }          
          
          setupProjectDialog.setResizable(false);
          setupProjectDialog.toFront();
          
          setupProjectDialog.pack();
          setupProjectDialog.setVisible(true);

     }


     public static void main ( String[] args ) {
          Main frame = new Main();
          frame.pack();
          frame.setVisible(true);
          
          createSetupProjectDialog();
     }

        // None of these get fired when the Jframe is switched to. I also tried a ComponentListener, but had no joy there either.
     public void windowGainedFocus(WindowEvent e) {
          System.out.println("Gained");
          setupProjectDialog.setVisible(true);
     }

     public void windowLostFocus(WindowEvent e) {
          System.out.println("GainedLost");
     }

     public void windowOpened(WindowEvent e) {
          System.out.println("YAY1!");
     }

     public void windowClosing(WindowEvent e) {
          System.out.println("YAY2!");
     }

     public void windowClosed(WindowEvent e) {
          System.out.println("YAY3!");
     }

     public void windowIconified(WindowEvent e) {
          System.out.println("YAY4!");
     }

     public void windowDeiconified(WindowEvent e) {
          System.out.println("YAY5!");
     }

     public void windowActivated(WindowEvent e) {
          System.out.println("YAY6!");
     }

     public void windowDeactivated(WindowEvent e) {
          System.out.println("YAY7!");
     }

     public void focusGained(FocusEvent e) {
          System.out.println("YAY8!");
     }

     public void focusLost(FocusEvent e) {
          System.out.println("YAY9!");
     }
}

SetupProject.java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
import java.awt.event.WindowListener;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class SetupProject extends JDialog implements ActionListener {

     public SetupProject( final JFrame frame, String title, boolean modal ) {
          // Setup the JDialog
          super( frame, title, modal );
          setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE );

          // Bad code. Is only temporary
          add( new JLabel("This is a test.") );

          // !!! TESTING
          addWindowFocusListener( new WindowFocusListener() {

               public void windowGainedFocus(WindowEvent e) {
                    // Naturally this now doesn't get called after the setVisible(false) call below
               }

               public void windowLostFocus(WindowEvent e) {
                    System.out.println("Lost");
                    setVisible(false); // Doing this sort of thing since frame.someMethod() always fires a null pointer exception?!
               }               
          });

     }

}

Any help would be very greatly appreciated.

Thank you!
Tristan

Set the image as the owner of the dialog box when you create the dialog box:

JFrame frame = new JFrame();
...
frame.setVisible( true );

JDialog dialog = new JDialog(frame);
...
dialog.setVisible( true );

Tags: Java

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