Runnable SWT / JOGL class demonstrating ability to create SWT Menu over SWT GLCanvas

SwtPopupExample.java

import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLProfile;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;

import com.jogamp.opengl.swt.GLCanvas;

public class SwtPopupExample
{
    public static void main( String[] args )
    {
        GLProfile glProfile = GLProfile.getMaxFixedFunc( true );
        GLCapabilities glCapabilities = new GLCapabilities( glProfile );

        final Display display = new Display( );
        final Shell shell = new Shell( display );
        shell.setLayout( new FillLayout( ) );

        final GLCanvas canvas = new GLCanvas( shell, SWT.NO_BACKGROUND, glCapabilities, null );

        shell.setSize( 800, 800 );
        shell.setLocation( 0, 0 );
        shell.open( );
        shell.moveAbove( null );

        final Menu menu = new Menu( shell, SWT.NONE );

        MenuItem m1 = new MenuItem( menu, SWT.PUSH );
        MenuItem m2 = new MenuItem( menu, SWT.PUSH );
        MenuItem m3 = new MenuItem( menu, SWT.PUSH );

        m1.setText( "Option 1" );
        m2.setText( "Option 2" );
        m3.setText( "Option 3" );

        canvas.addMouseListener( new MouseAdapter( )
        {
            @Override
            public void mouseDown( MouseEvent e )
            {
                System.out.println( "pre mousePressed " + e.x + " " + e.y + " Menu Visible " + menu.isVisible( ) );
                
                // map canvas coordinate system to Display coordinate system to place menu in proper location
                Point point = display.map( canvas, null, new Point( e.x, e.y ) );
                
                menu.setLocation( point );
                menu.setVisible( true );
                
                System.out.println( "post mousePressed " + point.x + " " + point.y + " Menu Visible " + menu.isVisible( ) );
            }
        } );

        while ( !shell.isDisposed( ) )
            if ( !display.readAndDispatch( ) ) display.sleep( );

        return;
    }
}