如何修剪 \toprule 的长度

Question

我希望能够修剪 a 和 的左侧和右侧，\toprule就像\bottomrule使用 一样\cmidrule(lr){<column range>}。我尝试使用 的解决方案非常接近，但不幸的是，它与 a /产生的\cmidrule[\heavyrulewidth]{<column range>}垂直结果并不完全一致。\toprule\bottomrule

因此，所需的输出是左侧的表格（使用\MyToprule和\MyBottomrule），但右侧的表格具有垂直对齐方式（使用\toprule和\bottomrule）。

笔记：

• 这个问题之前被问过如何修剪 \toprule 的长度？，但该帖子被关闭，被视为重复，因为标题并不完全符合要求，或者解决方法已经足够。
• 如果有更简单的方法来获得所需的输出，那将会很有用。

代码：

\documentclass{article}
\usepackage{booktabs}

\newcounter{MyCounter}

\newcommand*{\NumberRow}{\stepcounter{MyCounter}\arabic{MyCounter}.}%
\newcommand*{\MyToprule}[1]{% #1 = 2-<last column>
    \cmidrule[\heavyrulewidth]{#1}%
}%
\newcommand*{\MyBottomrule}[1]{% #1 = 2-<last column>
    \cmidrule[\heavyrulewidth]{#1}%
}%
\newenvironment{MyTabular}[2][]{%
    \setcounter{MyCounter}{0}%
    \tabular[#1]{#2}%
}{%
    \endtabular
}%

\newcommand*{\TabularContent}{%
               & Item Heading & Text Heading \\
               \cmidrule(lr){2-2}
               \cmidrule(lr){3-3}
    \NumberRow & Item 1  & Some Text \\
               & Item 1a & Some other Text \\
    \NumberRow & Item 2  & Some Text \\
}%


\begin{document}
\begin{MyTabular}{cll}
    \MyToprule{2-3}
       &\multicolumn{2}{c}{Using MyToprule and MyBottomrule} \\
       \TabularContent
    \MyBottomrule{2-3}
\end{MyTabular}%
\begin{MyTabular}{cll}
    \toprule
       &\multicolumn{2}{c}{Using toprule and bottomrule} \\
       \TabularContent
    \bottomrule
\end{MyTabular}%
\end{document}

Answer 1

我不确定你为什么要这样布局：顶部和底部规则旨在将表格与上下文区分开来，因此它们也应该涵盖行号。如果数字的作用从标题或其他列上方的标题中清晰可见，则带有行号的列可以没有标题。

如果您想继续这样做，就不要定义\MyToprule并\MyBottomrule提出论点，而是留下\cmidrule对论点的扫描。

MyTabular请注意，我修复了可选参数处理的定义。

\documentclass{article}
\usepackage{booktabs}

\newcounter{MyCounter}

\newcommand*{\NumberRow}{\stepcounter{MyCounter}\arabic{MyCounter}.}

\newcommand*{\MyToprule}{%
  \cmidrule[\heavyrulewidth]%
}

\newcommand*{\MyBottomrule}{%
  \cmidrule[\heavyrulewidth]%
}
\newenvironment{MyTabular}[2][c]{% Default is centering
    \setcounter{MyCounter}{0}%
    \tabular[#1]{#2}%
}{%
    \endtabular
}

\newcommand*{\TabularContent}{%
               & Item Heading & Text Heading \\
               \cmidrule(lr){2-2}
               \cmidrule(lr){3-3}
    \NumberRow & Item 1  & Some Text \\
               & Item 1a & Some other Text \\
    \NumberRow & Item 2  & Some Text \\
}


\begin{document}
\begin{MyTabular}{rll}
\MyToprule(lr){2-3} & \multicolumn{2}{c}{Using MyToprule} \\
\TabularContent
\MyBottomrule(lr){2-3}
\end{MyTabular}
\end{document}

（我改变了双列标题以避免它给第二列添加空间。）

---

更精美的版本，其中自定义环境和正常环境的垂直对齐方式相同（假设的参数为默认值booktabs）。

\documentclass{article}
\usepackage{booktabs,xparse}

\newcounter{MyCounter}

\newcommand*{\NumberRow}{\stepcounter{MyCounter}\arabic{MyCounter}.}

\newcommand*{\MyToprule}{%
  \addlinespace[-\aboverulesep]%
  \addlinespace[\heavyrulewidth]
  \addlinespace[-2\cmidrulewidth]
  \cmidrule[\heavyrulewidth]%
}

\DeclareExpandableDocumentCommand{\MyBottomrule}{d()m}{%
  \IfNoValueTF{#1}
   {\cmidrule[\heavyrulewidth]{#2}}
   {\cmidrule[\heavyrulewidth](#1){#2}}%
  \addlinespace[-\belowrulesep]
}
\newenvironment{MyTabular}[2][c]{%
    \setcounter{MyCounter}{0}%
    \tabular[#1]{#2}%
}{%
    \endtabular
}

\newcommand*{\TabularContent}{%
               & Item Heading & Text Heading \\
               \cmidrule(lr){2-2}
               \cmidrule(lr){3-3}
    \NumberRow & Item 1  & Some Text \\
               & Item 1a & Some other Text \\
    \NumberRow & Item 2  & Some Text \\
}


\begin{document}
\setlength{\parindent}{0pt} % just for the example

Top alignment:

\begin{MyTabular}[t]{rll}
\MyToprule(lr){2-3} & \multicolumn{2}{c}{Using MyToprule} \\
\TabularContent
\MyBottomrule(lr){2-3}
\end{MyTabular}\quad
\begin{tabular}[t]{rll}
\toprule & \multicolumn{2}{c}{Using MyToprule} \\
\TabularContent
\bottomrule
\end{tabular}

\bigskip

Center alignment:\medskip

\begin{MyTabular}{rll}
\MyToprule(lr){2-3} & \multicolumn{2}{c}{Using MyToprule} \\
\TabularContent
\MyBottomrule(lr){2-3}
\end{MyTabular}\quad
\begin{tabular}{rll}
\toprule & \multicolumn{2}{c}{Using MyToprule} \\
\TabularContent
\bottomrule
\end{tabular}

\bigskip

Bottom alignment:\medskip

\begin{MyTabular}[b]{rll}
\MyToprule(lr){2-3} & \multicolumn{2}{c}{Using MyToprule} \\
\TabularContent
\MyBottomrule(lr){2-3}
\end{MyTabular}\quad
\begin{tabular}[b]{rll}
\toprule & \multicolumn{2}{c}{Using MyToprule} \\
\TabularContent
\bottomrule
\end{tabular}

\end{document}