SpooledFileViewer Bug

["Frank Lustig" <flustig@xxxxxxxxx>]

  There seems to be a bug with the AS400 Toolbox's SpooledFileViewer. While the 
scrollbars display, they are not functional. I looked at the open-source code 
(version 4.4) and have come up with the following solution.

  The problem seems to occur at line 1377 of the code of SpooledFileViewer.java 
in the load() method:

            // create the page view for the viewer
            pageView_ = new SpooledFilePageView_();
            scrollView_.setViewportView(pageView_);

     SpooledFilePageView_ is an inner class that extends JLabel. I'm not too 
familiar with JScrollPanes, but examples demonstrating JScrollPanes 
(http://java.sun.com/docs/books/tutorial/uiswing/components/scrollpane.html)  
typically involve an ImageIcon within the JLabel constructor. The 
SpooledFileViewer code paints directly to the SpooledFilePageView_ itself, 
instead of its ImageIcon's Image. I decided to modify the code accordingly by 
providing an ImageIcon.

   I added the following code to the  SpooledFilePageView_ class (around line 
2000 of SpooledFileViewer.java):
 
  private ImageIcon icon = new ImageIcon();
  private BufferedImage image = new 
BufferedImage(50,50,BufferedImage.TYPE_INT_RGB);
  private Graphics g2 = image.getGraphics();
  private JLabel label=new JLabel(icon);

  public void refesh() {
   image = new BufferedImage(viewSize_.width, 
viewSize_.height,BufferedImage.TYPE_INT_RGB);
   g2 = image.getGraphics();
   g2.drawImage( currentPageImage_ ,0,0,viewSize_.width, viewSize_.height 
,null);
 
   icon.setImage(image);
   scrollView_.setViewportView(label);
  }


  Finally, I added the call to this new refresh() method in the updateViewer() 
method, at line 1876.

  This all seems to work- the scrollbars now work properly. I haven't tested 
thoroughy so I can't guarantee this fixes the problem completely and 
efficiently, but I hope this information is nevertheless useful. Note that I've 
been working under Sun's JDK 1.4.2.