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使用“m”对长表中的单元格内容进行垂直对齐（居中）

tag-icon • tag-icon tables longtable
使用“m”对长表中的单元格内容进行垂直对齐（居中）

我有一张表格，其中单元格可以包含一行或多行文本。我想让所有单元格内容垂直居中，同时水平使文本左对齐。到目前为止，我已经想出了以下代码：

\documentclass[final,10pt]{book}
\usepackage{longtable,booktabs}
\usepackage{array} % needed for "m" in longtable
\usepackage[paperwidth=9in,paperheight=3in,right=0.5in,bottom=0in,left=0.2in]{geometry}
\begin{document}
\thispagestyle{empty}
\noindent\begin{longtable}{@{} m{.30\paperwidth} m{.30\paperwidth} m{.30\paperwidth}@{}}
\toprule\addlinespace
\textbf{Header 1} & \textbf{Header 2} & \textbf{Header 3}
\\\addlinespace
\toprule\endhead
1. Lorem ipsum dolor sit amet (c1, r1) & This is second column (c2, r1), line one\newline This is second column (c2, r1), line two & This is third column (c3, r1), line one\newline This is third column (c3, r1), line two
\\\addlinespace\hline
2. Lorem ipsum dolor sit amet (c1, r2) & This is second column (c2, r2), line one\newline This is second column (c2, r2), line two & This is third column (c3, r2), line one\newline This is third column (c3, r2), line two
\\\addlinespace\hline
3. Lorem ipsum dolor sit amet (c1, r3) & c2, r3 & c3, r3
\\\addlinespace\hline
4. Lorem ipsum dolor sit amet (c1, r4) & c2, r4, line one \newline c2, r4, line two & c3, r4, line one\newline c3, r4, line two
\\\addlinespace
\bottomrule
\end{longtable}
All text in the cells should be centered vertically and left aligned horizontally.
\end{document}

结果是：

在此处输入图片描述

只有标题行的内容垂直居中。所有其他单元格均未垂直居中，并且它们在单元格顶部的填充量方面有所不同。

为什么这些单元格没有按预期居中？这难道不是longtable 定义中m（来自array包）应该做的事情吗？如何确保每个单元格中的文本垂直居中，无论其中有多少行文本？

答案1

您可能不想\addlinespace在很多地方手动插入指令，而是希望通过指令增加\aboverulesep和的值。另外，请考虑使用而不是。\belowrulesep\addtolength\midrule\hline

在此处输入图片描述

\documentclass[final,10pt]{book}
\usepackage{booktabs}
\addtolength\aboverulesep{0.15ex}  % extra spacing above and below rules
\addtolength\belowrulesep{0.35ex}

\usepackage{longtable, array} % "array" is needed for "m" in longtable

\usepackage[paperwidth=9in,paperheight=3in,right=0.5in,bottom=0in,left=0.2in]{geometry}

\begin{document}
\thispagestyle{empty}

\begin{longtable}{@{} *{3}{m{.30\paperwidth}} @{}}

\toprule
\textbf{Header 1} & \textbf{Header 2} & \textbf{Header 3} \\
\midrule[\heavyrulewidth] % make this rule as thick as \toprule
\endhead

\bottomrule
\endfoot

1. Lorem ipsum dolor sit amet (c1, r1) & This is second column (c2, r1), line one\newline This is second column (c2, r1), line two & This is third column (c3, r1), line one\newline This is third column (c3, r1), line two \\
\midrule
2. Lorem ipsum dolor sit amet (c1, r2) & This is second column (c2, r2), line one\newline This is second column (c2, r2), line two & This is third column (c3, r2), line one\newline This is third column (c3, r2), line two \\
\midrule
3. Lorem ipsum dolor sit amet (c1, r3) & c2, r3 & c3, r3 \\
\midrule
4. Lorem ipsum dolor sit amet (c1, r4) & c2, r4, line one \newline c2, r4, line two & c3, r4, line one\newline c3, r4, line two \\

\end{longtable}
\end{document}

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