!7

sclass FullScreen extends DynModule {
  transient JButton btn;
  
  JComponent visualize() {
    ret btn = jbutton("Full-screen on", f switch);
  }
  
  void switch {
    JDesktopPane desktop = cast get(creator(), 'desktop);
    if (desktop == null) ret;
    Window w = getWindow(desktop);
    if (!isFullScreen(desktop)) {
      showFullScreen(desktop);
    } else
      showMaximizedFrame(desktop);
    disposeWindow(w);
  }
}