JFileChooser in front of fullscreen Swing application

Question

I know there are some topics relative to this question (mainly this unanswered one and this one which is not handling full screen app).

I basically tried every combination of first topic sample and available methods (requestFocus, requestFocusInWindow, ...) but JFileChooser is always displaying behind the fullscreen app. I tried to change filechooser's parent too (setting it to null, itself or the parent frame) with no more success.

Have anyone a working example of this not-that-much-particular use case? Or is there a workaround to let user select files in a fullscreen app?

Answer 1

Unfortunately I can't say how you realised the implementation of the fullscreen app. But I tried a few things and came up with this:

import java.awt.Color;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class Gui extends JFrame {

    public Gui() {

        this.setDefaultCloseOperation(EXIT_ON_CLOSE);

        //this.setSize(java.awt.Toolkit.getDefaultToolkit().getScreenSize());
        // Set some charateristics of the frame
        this.setExtendedState(Frame.MAXIMIZED_BOTH);
        this.setBackground(Color.black);
        this.setUndecorated(true);

        JButton a = new JButton("PRESS ME!");

        a.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                JFileChooser fc = new JFileChooser();
                fc.showOpenDialog(getParent());
            }
        });

        this.add(a);

        this.setVisible(true);

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new Gui();
            }
        });
    }
}

Pay attention to the fact, that I created a new JFileChooser with the parent of the current JFrame as parameter.

EDIT: I now even tried to set

java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().setFullScreenWindow(new Gui());

and without the

this.setUndecorated(true);

it worked for me (got a nice fullscreen view and the JFileChooser was in the front). I believe the problem with the window decoration is linked to my window manager (I'm using linux with gnome).

Hopefully this solution works for you, if not: Could you explain a little bit more, how you create the fullscreen app?