static Rect boundsInParent(Component c) {
  if (c == null) null;
  ret swing(func -> Rectangle {
    Rect r = toRect(c.getBounds());
    while true {
      c = c.getParent();
      if (c == null) null;
      if (isInstance(theClass, c)) ret r;
      r = translateRect(r, c.getX(), c.getY());
    }
  });
}