3

I'd like to uncover a table row-by-row in a NiceTabular environment (provided by the nicematrix package). My table has alternating row colors, and I'd like overlay to cover/uncover the row color and its content at the same time. I'd also like to stick to the nicematrix package instead of using the conventional tabular/array environments.

I tried several ways that work in tabular and similar environments, but not in NiceTabular. These include:

MWE

\documentclass{beamer}
\usepackage{nicematrix,booktabs}

\begin{document}
\begin{frame}
\centering
\begin{NiceTabular}{m{.4\textwidth}m{.4\textwidth}}
  \CodeBefore
    \rowcolor{gray!50}{1} % heading
    \rowcolors{2}{gray!25}{} % body
  \Body
  \toprule
  \onslide<2->{Head 1 & Head 2} \
  \midrule
  Row 1 Col 1 & Row 1 Col 2 \pause\
  Row 2 Col 1 & Row 2 Col 2 Row 2 Col 2 Row 2 Col 2 Row 2 Col 2 \
  \bottomrule 
\end{NiceTabular}


Overlay in conventional \texttt{tabular} for comparison:
\begin{tabular}{m{.4\textwidth}m{.4\textwidth}}
  \toprule
  \onslide<2->{Head 1 & Head 2} \
  \midrule
  Row 1 Col 1 & Row 1 Col 2 \pause\
  Row 2 Col 1 & Row 2 Col 2 Row 2 Col 2 Row 2 Col 2 Row 2 Col 2 \
  \bottomrule 
\end{tabular}
\end{frame}
\end{document}
Herr K.
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  • Your MWE is not very clear (at least for me): there is two cells with the content Row 1 Col 1. Is it by design? – F. Pantigny Nov 12 '21 at 15:50
  • @F.Pantigny: Sorry they are just typos from copy-pasting. I'll fix that. BTW, thank you for the excellent package! – Herr K. Nov 12 '21 at 15:53

2 Answers2

3

Here is what I would do.

\documentclass{beamer}
\usepackage{nicematrix,booktabs}

\begin{document}
\begin{frame}[t]
\centering
\begin{NiceTabular}{m{.4\textwidth}m{.4\textwidth}}
\CodeBefore
  \rowcolor{gray!50}{1}
  \rowcolors{2}{gray!25}{}
\Body
\toprule
  Head 1 & Head 2 \
\midrule
\only<2->
  { Row 1 Col 1 & text text text text text text text text text text }
\only<3->
  { \ Row 2 Col 1 & text text text text text }
\only<4->
  { \ Row 3 Col 1 & text text text text text text text text text }
\only<5->
  {
    \ Row 4 Col 1 & text text \
    \bottomrule
  }
\end{NiceTabular}
\end{frame}
\end{document}

As usual with nicematrix, you need several compilations.

If you accept to write in white the text that must be hidden, you have also the following solution (with a centered vertical position of the tabular).

\documentclass{beamer}
\usepackage{nicematrix,booktabs}

\begin{document}
\begin{frame}
\centering
\color{white}
\begin{NiceTabular}{m{.4\textwidth}m{.4\textwidth}}[rules/color=black]
\CodeBefore
  \rowcolor{gray!50}{1}
\Body
\toprule
  \RowStyle[color=black]{}
  Head 1 & Head 2 \
\midrule
\only<2->{\RowStyle[color=black,rowcolor=gray!25]{}}
  Row 1 Col 1 & text text text text text text text text text text \ 
\only<3->{\RowStyle[color=black]{}}
  Row 2 Col 1 & text text text text text \ 
\only<4->{\RowStyle[color=black,rowcolor=gray!25]{}}
  Row 3 Col 1 & text text text text text text text text text \ 
\only<5->{\RowStyle[color=black]{}}
  Row 4 Col 1 & text text \
\bottomrule
\end{NiceTabular}
\end{frame}
\end{document}
F. Pantigny
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  • Thanks. This is almost what I want. It'd be nice if the table does not need to be top-aligned. Is it possible for nicematrix environments to process TikZ styling options such as visible on? – Herr K. Nov 12 '21 at 18:18
  • Is there a reason why you nest the \only's? They seem to work also when issued separately on each row (before the \\). – Herr K. Nov 12 '21 at 18:20
  • @HerrK. You are right: there is no point nesting the \only. I have changed my answer. – F. Pantigny Nov 12 '21 at 19:07
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    @HerrK. At this time, I don't see any way to have visible on working for rows in nicematrix. I will investigate. – F. Pantigny Nov 12 '21 at 19:22
  • Thank you very much. I'll go with your second solution. – Herr K. Nov 13 '21 at 01:22
2

It seems to be possible if you use \onslide inside of each cell. This might be a lot of code depending on the complexity of your table, though.

I tried the following:

\documentclass{beamer}
\usepackage{nicematrix,booktabs}

\begin{document}


\begin{frame}
\centering
\begin{NiceTabular}{m{.4\textwidth}m{.4\textwidth}}
  \CodeBefore
    \rowcolor{gray!50}{1} % heading
    \onslide<3->{\rowcolors{2}{gray!25}{}} % body
  \Body
  \toprule
  Head 1 & Head 2 \
  \midrule
  \onslide<2->{Row 1 Col 1} & \onslide<2->{Row 1 Col 2} \
  \onslide<3->{Row 2 Col 1} & \onslide<3->{Row 2 Col 2} \
  \bottomrule
\end{NiceTabular}
\end{frame}


\end{document}

... and got the following output:

enter image description here

Jasper Habicht
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