如何在 Beamer LaTeX 中为禁忌行背景着色

Question

我正在尝试将此环境的第三行的背景涂成tabu红色：

\documentclass{beamer}

\usepackage{tabu}
\usepackage{colortbl}

\begin{document}

\begin{frame}
\begin{tabu}{XX}
\everyrow{\hline} \hline 
Row 1 & Row 1 \\
Row 2 & Row 2 \\
\rowcolor{red}
Row 3 & Row 3 \\
Row 4 & Row 4 \\
\end{tabu}
\end{frame}

\end{document}

该rowcolor命令无效，输出中没有一行具有彩色背景。我很确定这在某个时候（可能是很久以前）曾经起作用，但我知道可能colortbl（现在）与不兼容tabu。我也尝试过使用该\taburowcolors命令，但没有成功。

tabu在文档内部的环境中为单行着色的推荐方法是什么beamer？

笔记：我正在使用 XeLaTeX 进行编译，以防出现差异。

Answer 1

在评论中，您指出您正在使用 tabu 在每一行后插入 \hline。这也可以这样做（如果需要 \ 的可选参数，则必须添加一些调整）：

\documentclass{beamer}

\usepackage{colortbl}
\newcommand\tabnewlinewithhline{\tabularnewline\hline}
\newcommand\tabaddhline{\let\\\tabnewlinewithhline}
\newcolumntype\ccwithhline{c>{\tabaddhline}c}
\begin{document}

\begin{frame}

\begin{tabular}{\ccwithhline}
\hline
Row 1 & Row 1 \\
Row 2 & Row 2 \\
\rowcolor{red}
Row 3 & Row 3 \\
Row 4 & Row 4 \\
\end{tabular}
\end{frame}

\end{document}

Answer 2

下面定义了两个环境，一个mytabular（类似于tabular）和一个mytabularx（类似于tabularx）环境，它们\hline在每行之间放置一个，并\hline在环境的顶部和底部放置两个。它通过本地修补array包的一些内部来实现这一点。任何嵌套的tabular或array环境都不应包含这些\hline，这对于创建一些特殊的对齐是可取的（例如使用\makecell需要这个）。在这两个环境中，最后一行不需要以\\（负责大部分所需代码）结尾。

该机制应该可以工作，但如果有人发现错误，请报告。此外，如果有人认为该机制太笨拙，请随时发表评论并建议更好的方法（我知道，\everycr但出于我不知道的原因，我没有使用它，所以这可能是修补的可行替代方案array）\\。

\documentclass[]{article}

\usepackage[table]{xcolor}
\usepackage{array}
\usepackage{tabularx}
\usepackage{etoolbox}
\usepackage{environ}

\makeatletter
\newcommand\mypatchcmd[3]%>>>
  {%
    \patchcmd#1{#2}{#3}{}{\GenericError{}{Patching \string#1\space failed}{}{}}%
  }%<<<
\newcommand\mypretocmd[2]%>>>
  {%
    \pretocmd#1{#2}{}{\GenericError{}{Patching \string#1\space failed}{}{}}%
  }%<<<
\newcommand\myapptocmd[2]%>>>
  {%
    \apptocmd#1{#2}{}{\GenericError{}{Patching \string#1\space failed}{}{}}%
  }%<<<
\newcommand*\unpatch@array%>>>
  {%
    \let \@@array      \@@array@original
    \let \@arraycr     \@arraycr@original
    \let \@xarraycr    \@xarraycr@original
    \let \@xargarraycr \@xargarraycr@original
    \let \@yargarraycr \@yargarraycr@original
    \let \tabular      \tabular@original
    \let \endtabular   \endtabular@original
    \let \array        \array@original
    \let \endarray     \endarray@original
  }%<<<
\newcommand*\patch@array%>>>
  {%
    \mypretocmd\tabular{\unpatch@array}%
    \mypretocmd\array{\unpatch@array}%
    \myapptocmd\@yargarraycr{\my@hline}%
    \mypatchcmd\@xarraycr{\cr}{\cr\my@hline}%
    \mypatchcmd\@xargarraycr{\cr}{\cr\my@hline}%
    \myapptocmd\@@array{\hline\hline}%
  }%<<<
\newcommand*\backup@array%>>>
  {%
    \let \@@array@original      \@@array
    \let \@arraycr@original     \@arraycr
    \let \@xarraycr@original    \@xarraycr
    \let \@xargarraycr@original \@xargarraycr
    \let \@yargarraycr@original \@yargarraycr
    \let \tabular@original      \tabular
    \let \endtabular@original   \endtabular
    \let \array@original        \array
    \let \endarray@original     \endarray
  }%<<<
\newenvironment{mytabular}[2][c]%>>>
  {%>>>
    \backup@array
    \patch@array
    \begin{tabular@original}[#1]{#2}%
  }%<<<
  {%>>>
    \crcr
    \hline
    \hline
    \end{tabular@original}%
  }%<<<
%<<<
\newcommand\my@hline%>>>
  {%
    \noalign{\ifnum0=`}\fi
    \futurelet\reserved@a\my@xhline
  }%<<<
\newcommand\my@xhline%>>>
  {%
    \ifx\reserved@a\end
      \expandafter\my@yhline
    \else
      \hrule\@height\arrayrulewidth
      \ifx\reserved@a\hline
        \vskip\doublerulesep
      \fi
      \expandafter\my@xhline@fin
    \fi
  }%<<<
\newcommand*\my@xhline@fin%>>>
  {%
    \ifnum0=`{\fi}%
  }%<<<
\newcommand\my@yhline[2]%>>>
  {%
    \begingroup
    \def\tmpa{#2}%
    \def\tmpb{mytabular}%
    \expandafter
    \endgroup
    \ifx\tmpa\tmpb
    \else
      \hrule\@height\arrayrulewidth
    \fi
    \ifnum0=`{\fi}%
    \end{#2}%
  }%<<<
\newcommand\mytabularx@expandhelper[2]%>>>
  {%
    #2#1%
  }%<<<
\NewEnviron{mytabularx}%>>>
  {%
    \backup@array
    \patch@array
    \edef\BODY{\expandafter\mytabularx@striplast\expandafter{\BODY}}%
    \expandafter\mytabularx@expandhelper\expandafter{\BODY}{\begin{tabularx}}%
    \crcr
    \hline
    \hline
    \end{tabularx}%
  }%<<<
\newcommand\myifempty[1]%>>>
  {%
    \if\relax\detokenize{#1}\relax
      \expandafter\@firstoftwo
    \else
      \expandafter\@secondoftwo
    \fi
  }%<<<
\newcommand\myifnobbackslash[1]%>>>
  {%
    \myifbbackslash@#1\\\endmyifbbackslash@
  }%<<<
\def\myifbbackslash@#1\\#2\endmyifbbackslash@%>>>
  {%
    \myifempty{#2}%
  }%<<<
\newcommand\mytabularx@striplast[1]%>>>
  {%
    \myifnobbackslash{#1}
      {%
        \unexpanded{#1}%
      }
      {%
        \mytabularx@striplast@#1\endmytabularx@striplast
      }%
  }%<<<
\def\mytabularx@striplast@#1\\#2\endmytabularx@striplast%>>>
  {%
    \myifempty{#2}
      {%
        \unexpanded{#1}%
      }%
      {%
        \unexpanded{#1\\}%
        \mytabularx@striplast{#2}%
      }%
  }%<<<
\makeatother

\begin{document}
\noindent
\begin{mytabularx}{\linewidth}{XX}
  Row 1 & Row 1 \\
  Row 2 & Row 2 \\
  \rowcolor{red}
  Row 3 & Row 3 \\
  Row 4 & Row 4 \\
\end{mytabularx}

\bigskip
\begin{mytabular}{ll}
  a & b\\
  c & d\\
  \multicolumn{2}{c}{ab}\\
  e & f\\
  \begin{tabular}{@{}l@{}}a\\b\end{tabular} & cd \\
\end{mytabular}
\end{document}