![tabularx 环境中自己的计数器从 3 开始](https://linux22.com/image/309838/tabularx%20%E7%8E%AF%E5%A2%83%E4%B8%AD%E8%87%AA%E5%B7%B1%E7%9A%84%E8%AE%A1%E6%95%B0%E5%99%A8%E4%BB%8E%203%20%E5%BC%80%E5%A7%8B.png)
以下示例显示环境中的自定义计数器tabularx
不以“1”开头。无法弄清楚如何定义命令以始终以“1”开头。有什么想法吗?
\documentclass{article}
\usepackage{enumitem}
\usepackage{cleveref}
\usepackage{etoolbox}
\usepackage{booktabs}
\usepackage{ltxtable}
\usepackage{ltablex}
\makeatletter\newcommand*{%
\CreateCounterIfNotExists}[1]{\begingroup%
\@ifundefined{c@#1}{\newcounter{#1}}{}%
\endgroup}\makeatother
\def\sdef#1{\expandafter\def\csname#1\endcsname}
\newcommand\requirement[3]{%
\CreateCounterIfNotExists{my#1}%
\sdef{themy#1}{#1\arabic{my#1}}%
\refstepcounter{my#1}%
\label{#2} #1\arabic{my#1}: #3%
}
\begin{document}
\requirement{A}{req:foo:a}{Starts with 1}
\requirement{A}{req:foo:b}{continues with 2}
\requirement{B}{req:hop:a}{Starts with 1}
\requirement{B}{req:hop:b}{continues with 2}
\begin{tabularx}{\textwidth}{lX}
\caption{Requirements}\\
\label{tbl:reqs}\\
\toprule
\textbf{Area}& \textbf{Description} \\\midrule
\requirement{C}{req:bar:A}{Starts with 3}
\requirement{C}{req:bar:B}{Continues with 4}
&
This should start with C1 \\\midrule
\end{tabularx}
\end{document}
答案1
您不能在计数器tabularx
执行其工作时定义它。
解决方案可能是预先定义您需要的那个tabularx
,或者使用文件以延迟方式执行.aux
。
\documentclass{article}
\usepackage{enumitem}
\usepackage{etoolbox}
\usepackage{booktabs}
\usepackage{ltxtable}
\usepackage{ltablex}
\usepackage{cleveref}
\makeatletter
\newcommand\requirement[3]{%
\protected@write\@auxout{}{\string\CreateCounter{#1}}%
\@ifundefined{c@my#1}
{#1??: #3}
{\refstepcounter{my#1}\label{#2}#1\arabic{my#1}: #3}%
}
\newcommand{\CreateCounter}[1]{%
\@ifundefined{c@my#1}
{\newcounter{my#1}\global\@namedef{themy#1}{#1\arabic{my#1}}}
{}%
}
\AtEndDocument{\let\CreateCounter\@gobble}
\makeatother
\begin{document}
{\requirement{A}{req:foo:a}{Starts with 1}}
\requirement{A}{req:foo:b}{continues with 2}
\requirement{B}{req:hop:a}{Starts with 1}
\requirement{B}{req:hop:b}{continues with 2}
\noindent
\begin{tabularx}{\textwidth}{lX}
\caption{Requirements}\label{tbl:reqs}\\
\toprule
\textbf{Area}& \textbf{Description} \\
\midrule
\requirement{C}{req:bar:A}{Starts with 1}
\requirement{C}{req:bar:B}{Continues with 2} & This should start with C1 \\
\midrule
\end{tabularx}
\end{document}
第一次\requirement{X}
使用时不会生成数字,但下次运行 LaTeX 时会生成数字。
答案2
您几乎永远不应该在宏中声明计数器,它应该在序言中声明一次并仅使用。然后tabularx
在进行试验宽度设置时了解它并保留其值。
\documentclass{article}
\usepackage{enumitem}
\usepackage{cleveref}
\usepackage{etoolbox}
\usepackage{booktabs}
\usepackage{ltxtable}
\usepackage{ltablex}
\newcounter{myA}\renewcommand\themyA{A\arabic{myA}}
\newcounter{myB}\renewcommand\themyB{B\arabic{myB}}
\newcounter{myC}\renewcommand\themyC{C\arabic{myC}}
\newcommand\requirement[3]{%
\refstepcounter{my#1}%
\label{#2}#1\arabic{my#1}: #3%
}
\begin{document}
\requirement{A}{req:foo:a}{Starts with 1}
\requirement{A}{req:foo:b}{continues with 2}
\requirement{B}{req:hop:a}{Starts with 1}
\requirement{B}{req:hop:b}{continues with 2}
\begin{tabularx}{\textwidth}{lX}
\caption{Requirements}\\
\label{tbl:reqs}\\
\toprule
\textbf{Area}& \textbf{Description} \\\midrule
\requirement{C}{req:bar:A}{Starts with 3}
\requirement{C}{req:bar:B}{Continues with 4}
&
This should start with C1 \\\midrule
\end{tabularx}
\end{document}
答案3
正如 David Carlisle 和 egreg 的解决方案中提到的那样:不应定义计数器on-the-fly
。
我使用了与 David Carlisle 类似的方法,提供了仅可在序言中使用的\NewDocumentCounter
、、\DeclareRequirement
命令,以防止意外使用。DeclareRequirements
\documentclass{article}
\usepackage{enumitem}
\usepackage{etoolbox}
\usepackage{booktabs}
\usepackage{ltxtable}
\usepackage{ltablex}
\usepackage{cleveref}
\usepackage{xparse}
\NewDocumentCommand{\NewDocumentCounter}{m}{%
\ifltxcounter{#1}{%
}{%
\typeout{Creating counter #1}
\newcounter{#1}%
}
}
\NewDocumentCommand{\DeclareRequirement}{m}{%
\NewDocumentCounter{my#1}%
\expandafter\renewcommand\csname themy#1\endcsname{#1\arabic{my#1}}
}%
\listgadd\reqlist{}
\NewDocumentCommand{\DeclareRequirements}{+m}{%
\forcsvlist{\listgadd\reqlist}{#1}
\forlistloop{\DeclareRequirement}{\reqlist}
}%
\makeatletter
\@onlypreamble{\NewDocumentCounter}
\@onlypreamble{\DeclareRequirement}
\@onlypreamble{\DeclareRequirements}
\makeatother
\DeclareRequirements{A,B,C} % Declare all requirement counters in a row ...
\newcommand\requirement[3]{%
\refstepcounter{my#1}%
\label{#2} #1\arabic{my#1}: #3%
}
\begin{document}
\requirement{A}{req:foo:a}{Starts with 1}
\requirement{A}{req:foo:b}{continues with 2}
\requirement{B}{req:hop:a}{Starts with 1}
\requirement{B}{req:hop:b}{continues with 2}
\begin{tabularx}{\textwidth}{lX}
\caption{Requirements}\\
\label{tbl:reqs}\\
\toprule
\textbf{Area}& \textbf{Description} \\\midrule
\requirement{C}{req:bar:A}{Starts with 3 no longer} %\themyC
\requirement{C}{req:bar:B}{Continues with 4 no longer} %\themyC
&
This should start with C1 \\\midrule
\end{tabularx}
\end{document}