how to implement `cvtripleitem` in moderncv

Question

You may know that there exists cvdoubleitem in moderncv with which you can put double items in one line. Is there a way to self-define a cvtripleitem so as to put triple items in one line?

\documentclass[10pt,a4paper,sans]{moderncv}
\moderncvtheme[blue]{classic}
\usepackage[T1]{fontenc}
\usepackage[utf8x]{inputenc}
\usepackage[english]{babel}
\usepackage{helvet}
\usepackage[scale=0.9]{geometry}
\name{John}{Doe}

\begin{document}
\maketitle

\section{aaa}
\cvdoubleitem{xxxx}{aaaaa}{yyyyy}{bbbbb}
% what I want is: \cvtripleitem{xxx}{aaa}{yyy}{bbb}{zzz}{ccc}
\end{document} 

Answer 1

Here's one possibility:

\documentclass{moderncv}
\moderncvtheme{classic}
\usepackage[scale=0.9]{geometry}

\newlength\Tripleitemmaincolumnwidth
\newlength\tripleitemmaincolumnwidth

\AtBeginDocument{%
\setlength\tripleitemmaincolumnwidth{% 
  \maincolumnwidth-2\hintscolumnwidth-2\separatorcolumnwidth}%
\setlength\tripleitemmaincolumnwidth{.333333\tripleitemmaincolumnwidth}%   
  }

\newcommand*{\cvtripleitem}[7][.25em]{%
 \cvitem[#1]{#2}{%
   \begin{minipage}[t]{\tripleitemmaincolumnwidth}#3\end{minipage}%
   \hfill
   \begin{minipage}[t]{\hintscolumnwidth}\raggedleft\hintstyle{#4}\end{minipage}%
   \hspace*{\separatorcolumnwidth}%
   \begin{minipage}[t]{\tripleitemmaincolumnwidth}#5\end{minipage}%
   \hfill
   \begin{minipage}[t]{\hintscolumnwidth}\raggedleft\hintstyle{#6}\end{minipage}%
   \hspace*{\separatorcolumnwidth}%
   \begin{minipage}[t]{\tripleitemmaincolumnwidth}#7\end{minipage}%
   }%
}

\name{John Doe}{}

\begin{document}

\section{Computer skills}
\cvdoubleitem{category 1}{XXX, YYY, ZZZ}{category 4}{XXX, YYY, ZZZ}
\section{Computer skills}
\cvtripleitem{category 1}{XXX, YYY, ZZZ}{category 2}{XXX, YYY, ZZZ}{category 3}{XXX, YYY, ZZZ}

\end{document}

You can use \cvtripleitem in a similar fashion to \cvdoubleitem, but with two additional mandatory arguments (for the third item in the row).

Take into account that, depending on the document page layout, the space reserved for the items might be too narrow.