LayoutStyle style = LayoutStyle.getInstance();
int north = style.getContainerGap(todrop, SwingConstants.NORTH, container);
int w = container.getWidth();
if (Math.abs(ty - insets.top) < THRESHOLD_DISTANCE) {
List<Quartet> list = new ArrayList<Quartet>();
Quartet trio = new Quartet(insets.top, insets.top, insets.left, w - insets.right, new HorizontalLeadingContainerAnchor(container));
list.add(trio);
return list;
} else if (Math.abs(ty - north - insets.top) < THRESHOLD_DISTANCE) {
List<Quartet> list = new ArrayList<Quartet>();
Quartet trio = new Quartet(north + insets.top, north + insets.top, insets.left, w - insets.right,