Question

I have developed Swing application in which I have used JDialog to show popup.

But the problem is when I press alt+tab it shows only the dialog not the application. I also tried the modal for dialog.

My requirement is when the dialog opened on application and I press the alt+tab key it switch to another X application and again when I press alt+tab key it display dialog opened on my application. Currently it shows dialog opened but alone not with application.

How I can meet this requirement using JDialog?

Here is sample code

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

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
*$Id$
*/
public class Main
{
    public static void main(final String[] args)
    {
        final JFrame jFrame = new JFrame();
        jFrame.setSize(300, 200);
        final JPanel panel = new JPanel();
        final JButton button = new JButton("click here to open dialog");
        final ProductDialog dialog = new ProductDialog();
        button.addActionListener(new ActionListener()
        {

            @Override
            public void actionPerformed(final ActionEvent e)
            {
                dialog.setVisible(true);
            }
        });
        panel.add(button);
        jFrame.add(panel);
        jFrame.setVisible(true);
    }
}

And The dialog is as under

import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class ProductDialog extends JDialog
{
    private static final long serialVersionUID = 1L;

    public ProductDialog()
    {
        this.add(new JPanel().add(new JLabel("Test")));
        this.setSize(150, 100);
        this.setModal(true);
        this.setLocationRelativeTo(null);
    }
}

Here is an image of the visual effect of a small app. that is currently displaying a security dialog in alt+tab on Windows 7. The app. itself is already visible on-screen, though the security dialog (upper left) is all that is shown in the smaller icons.

Answer 1

You need to set the parent window of the dialog to the Frame of your application.

Small example:

import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

public class TestDialog {

    protected void initUI() {
        JFrame frame = new JFrame(TestDialog.class.getSimpleName());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final JButton button = new JButton("Click me to open dialog");
        button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                Window parentWindow = SwingUtilities.windowForComponent(button);
                JDialog dialog = new JDialog(parentWindow);
                dialog.setLocationRelativeTo(button);
                dialog.setModal(true);
                dialog.add(new JLabel("A dialog"));
                dialog.pack();
                dialog.setVisible(true);
            }
        });
        frame.add(button);
        frame.pack();
        frame.setVisible(true);
    }

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

            @Override
            public void run() {
                new TestDialog().initUI();
            }
        });
    }
}