CODEWITHSUNDEEP
javaswing
Christian Schulte
Christian Schulte

Reputation: 71

How to find the currently displaying dialog?

See the example code below. After clicking the example button a few times, how to find the last dialog opened ? This is a real use-case. A user has opened one or two modal dialogs and has clicked a button starting a long running background task in the last dialog and has then switched to another application during that background task is running. On completion, the task should display a notification window with the correct dialog as the parent so that when switching back to the application, that notification window is shown on top of the correct dialog.

import java.awt.FlowLayout;
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.SwingUtilities;
import javax.swing.WindowConstants;

public class Example
{

    private JDialog createDialog( final Window parent, final int count )
    {
        final JDialog dialog = new JDialog( parent, "Dialog " + count );
        dialog.setModal( true );
        dialog.getContentPane().setLayout( new FlowLayout() );

        final JButton button = new JButton( "Open Dialog " + ( count + 1 ) );
        button.addActionListener( new ActionListener()
        {

            @Override
            public void actionPerformed( final ActionEvent e )
            {
                final JDialog nextDialog = createDialog( dialog, count + 1 );
                nextDialog.pack();
                nextDialog.setLocationRelativeTo( dialog );
                nextDialog.setVisible( true );
            }

        } );

        dialog.getContentPane().add( button );
        return dialog;
    }

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

            @Override
            public void run()
            {
                final Example example = new Example();
                final JDialog dialog = example.createDialog( null, 1 );
                dialog.setDefaultCloseOperation( WindowConstants.DISPOSE_ON_CLOSE );
                dialog.pack();
                dialog.setLocationRelativeTo( null );
                dialog.setVisible( true );
            }

        } );
    }

}

Upvotes: 1

Views: 710

Answers (1)

MadProgrammer
MadProgrammer

Reputation: 347334

You could use KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusedWindow() which will, obviously, return the window which current contains the component with the current keyboard focus...

Upvotes: 2

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