READ_TOP_TO_BOTTOM
return READ_TOP_TO_BOTTOM;
case READ_TOP_TO_BOTTOM:
case READ_TOP_TO_BOTTOM:
case READ_TOP_TO_BOTTOM:
case READ_TOP_TO_BOTTOM:
case READ_TOP_TO_BOTTOM:
} else if (direction == READ_TOP_TO_BOTTOM || direction == READ_BOTTOM_TO_TOP) {