/** * Calculate extra space taken by the popup decorations * * @return */ protected Size calculatePopupExtra() { Element pe = popup.getElement(); Element ipe = popup.getContainerElement(); // border + padding int width = Util.getRequiredWidth(pe) - Util.getRequiredWidth(ipe); int height = Util.getRequiredHeight(pe) - Util.getRequiredHeight(ipe); return new Size(width, height); }