[java3d] Canvas3D not coming back after Closing JFrame

[John Sutter]

I guess this is really another Swing vs J3D sort of thing, but..  
I have a nice JFrame used as a control panel with a bunch of stuff 
(Jthis, Jthat, Jetc...) and a Canvas3D that I draw into.  When I 
close the JFrame using the clicking on Windows close buttons and
later set the JFrame to visible again later, the Canvas3D isn't
redrawn.  If I resize the JFrame it gets repainted just fine.

So, as a hack, I do a:
  Dimension dim = this.getSize ()
  canvas.setSize (dim.width+1, dim.height+1);
  this.setVisible (true);
  canvas.setSize (dim.width, dim.height);

and it works for my situation.  It's a hack, it works, but
it's just not right.  Is there a better way?  I've tried
canvas.repaint (), canvas.validate (), canvas.invalidate (),
canvas.doTheRightThing (), etc... with no luck. 

Anyone know the answers?

--  John

VisTest.java:



import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.media.j3d.*;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.ColorCube;


public class VisTest extends JFrame implements ActionListener {

  VisTest slave;
  Canvas3D canvas;
  JButton button;

  public static void main (String[] argv) {
    VisTest st = new VisTest ();
  }

  public VisTest () {
    button = new JButton (OPEN);
    button.setActionCommand (OPEN_CMD);
    button.addActionListener (this);
     
    // set up components
    JPanel pane = new JPanel ();
    getContentPane ().add (pane);
    pane.setLayout (new BorderLayout ());
    pane.add (button, BorderLayout.CENTER);

    // display window
    setTitle ("Master");
    setSize (100, 100);
    setVisible (true);
  
    slave = new VisTest (1);

    addWindowListener ((WindowListener) new WindowAdapter () {
      public void windowClosing (WindowEvent e) {
        System.exit (0);
      }
    });
  }

  public VisTest (int foo) {
   
    canvas = new Canvas3D (null);
    canvas.setSize (256, 256);
    BranchGroup theBG = new BranchGroup ();
    theBG.addChild (new ColorCube (0.4));
    theBG.compile ();

    SimpleUniverse u = new SimpleUniverse (canvas);
    u.getViewingPlatform ().setNominalViewingTransform ();
    u.addBranchGraph (theBG);

    button = new JButton (CLOSE);
    button.setActionCommand (CLOSE_CMD);
    button.addActionListener (this);
     
    addWindowListener ((WindowListener) new WindowAdapter () {
      public void windowClosing (WindowEvent e) {
        setVisible (false);
      }
    });


    JPanel pane = new JPanel ();
    getContentPane ().add (pane);
    pane.setLayout (new BorderLayout ());
    pane.add (canvas, BorderLayout.CENTER);
    pane.add (button, BorderLayout.SOUTH);

    // display window
    setTitle ("Canvas");
    setSize (400, 370);
    setVisible (true);
  }

  private void  makeMeVisible () {
    if (canvas != null) {
      Dimension dim = getSize ();
      canvas.setSize (dim.width+1, dim.height+1);
      setVisible (true);
      canvas.setSize (dim.width, dim.height);
    }
  }


  public void actionPerformed  (ActionEvent evt) {
    String cmd = evt.getActionCommand ();
    if (cmd.equals (CLOSE_CMD)) {
      this.setVisible (false);
    } else if (cmd.equals (OPEN_CMD)) {
      if (slave != null) {
        slave.makeMeVisible ();
      }
    }
  }

  public static final String CLOSE = "Close";
  public static final String CLOSE_CMD = CLOSE;
  public static final String OPEN = "Open";
  public static final String OPEN_CMD = OPEN;

}
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