description, enumitem, beamer

Question

I am looking for a similar solution as here Description list with aligned descriptions except that I want to use it with beamer. If I use enumitem with beamer, inner theme is replaced by enumitem. I do not want to use enumitem because of this problem. Is there any alternative package or solution which works only with description? Kindly suggest.

Answer 1

Here's one possibility adaption the answer linked in the question to the beamer settings:

\documentclass{beamer} 
\usetheme{Warsaw}

\makeatletter
\def\Mdescription#1{%
  \advance\beamer@descdefault by \labelsep%
  \list
  {}
  {\labelwidth\beamer@descdefault%
  \leftmargin\beamer@descdefault%
  \let\makelabel\beamer@descriptionitem
  \settowidth\labelwidth{\beamer@descriptionitem{#1}}%
  \setlength\leftmargin{\labelwidth}% 
  \addtolength\leftmargin{\labelsep}%
  }%
  \beamer@cramped%
  \raggedright
  \beamer@firstlineitemizeunskip%
}
\def\endMdescription{\ifhmode\unskip\fi\endlist}
\long\def\beamer@descriptionitem#1{%
  \def\insertdescriptionitem{#1}%
  {\usebeamertemplate**{description item}}\hfil}
\makeatother  

\begin{document} 

\begin{frame} 
\begin{Mdescription}{The longest label}
\item[The longest label] some text 
\item[Short] some additional text so we can see line wrapping in the example 
\end{Mdescription} 

\begin{Mdescription}{ABC} 
\item[A] some text 
\item[ABC] some additional text so we can see line wrapping in the example  
\end{Mdescription} 
\end{frame} 

\end{document}

The result:

There's only one caveat: the Mdescription environment doesn't use now an optional argument of the form <+->, so overlay specifications will have to be made in \item.