!7

static DynamicVStack buttons;

p-subst-autoupdate {
  buttons = showNiceVerticalButtons();
  refresh();
  addButtonsToWindow(buttons, "Refresh", f-thread refresh);
}

svoid refresh {
  if (replaceNiceButtons(buttons, filesForNiceButtons(sortFilesByDate(listPNGFiles(userDesktopDir()))))) {
    centerPackFrame(buttons);
    final JScrollPane sp = getParentOfType(buttons, JScrollPane.class);
    scrollPaneOnScroll(sp, r {
      //print("Scroll. " + mapMethod('getBounds, buttons.components()));
      JViewport vp = sp.getViewport();
      Rect vpRect = toRect(vp.getBounds());
      new L<S> l;
      for (Component c : buttons.components()) {
        Rect r = boundsInParent(c, vp);
        if (rectsIntersect(vpRect, r))
          l.add(getText((JButton) c));
      }
      print("Showing: " + l);
    });
  }
}