updateColumnRequirements(); SizeRequirements r = calculateMinorAxisRequirements(X_AXIS, null); SizeRequirements.calculateTiledPositions(targetSpan, r, columnRequirements, offsets, spans);
  protected void layoutColumns(int targetSpan, int[] offsets, int spans[],                               SizeRequirements[] reqs)  {    // TODO: Figure out what exactly to do here.   }