!7

static S id;
static ImageSurface is;
static JButton btnNext;

p-subst { next(); }

svoid next {
  disableButton(btnNext);
  id = randomImageServerID();
  thread {
    try {
      BufferedImage img = loadImage2_progressBar(id);
      bool first = is == null;
      is = showImage_pack(is, img, getSnippetTitle(id) + " - " + id);
      if (first)
        addToWindow_pack(is, withTopMargin(jcenteredline(btnNext = jbutton("Next image", f next))));
      centerFrame(is);
    } finally {
      enableButton(btnNext);
    }
  }
}