class ThreadedLayoutAction extends AbstractAction {
  boolean layoutMorphingEnabled = true;

  public ThreadedLayoutAction() {
    super("Threaded Layout");
  }

  public void actionPerformed(ActionEvent ev) {
    final OrganicLayouter layouter = new OrganicLayouter();
    // Copy graph in AWT thread.
    final CopiedLayoutGraph cGraph = new CopiedLayoutGraph(view.getGraph2D());

    // Calculate a layout on the copy of the original graph within a separate 
    // thread.
    final Thread thread = new Thread() {
      public void run() {
        layouter.doLayout(cGraph);

        // Assign the calculated layout to the original graph within the AWT 
        // thread.
        SwingUtilities.invokeLater(new Runnable() {
          public void run() {
            if (layoutMorphingEnabled) {
              // Perform an animated morphing on layout result.
              GraphLayout gl = cGraph.getLayoutForOriginalGraph();
              new LayoutMorpher(view, gl).execute();
            }
            else {
              // Assign the layout directly without morphing and display the 
              // result.
              cGraph.commitLayoutToOriginalGraph();
              view.fitContent();
              view.updateView();
            }
          }
        });
      }
    };
    // Assign minimum priority to the layout thread so that the GUI remains 
    // responsive.
    thread.setPriority(Thread.MIN_PRIORITY);
    // Start the layout thread.
    thread.start();
  }
}