我创建了一个自定义环境，将语义与用例表的设计和格式分开。一切正常，只是环境tabularx无法跨列分列，当多个（尤其是较长的）用例紧接着一个时，会产生难看的空白区域。有什么方法可以让它们跨列分列吗？
\documentclass[10pt]{scrartcl}
\usepackage[english]{babel}
\usepackage[margin=15mm]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[svgnames,table]{xcolor}
\usepackage{booktabs,tabularx,multicol,enumitem,blindtext}
\setlist{leftmargin=*,nosep}
\newcommand{\tabhead}[2][DarkBlue]{\textbf{\large\sffamily\color{#1} #2}}
\newcounter{usecase}
\newenvironment{usecase}[1]{
\refstepcounter{usecase}
\noindent\tabularx{\linewidth}{lX}
\rowcolor{gray!20}\tabhead{Case~\theusecase} & \tabhead[DarkGreen]{#1}\\
\toprule
}
{\bottomrule\endtabularx\medskip}
\newcommand{\actor}[1]{Actor & #1\\\midrule}
\newcommand{\precondition}[1]{Needs & #1\\\midrule}
\newcommand{\mainpath}[1]{
Path & \begin{minipage}[t]{\linewidth}\blindenumerate[20]
\end{minipage}\\}
\setlength{\footskip}{1cm}
\begin{document}
\title{The Title}
\author{Casimir}
\date{\today}
\maketitle
\begin{abstract}
\blindtext
\end{abstract}
\begin{multicols}{2}
\section{First Section}
\blindtext
\subsection{First Subsection}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\end{multicols}
\end{document}
更新
受大卫卡莱尔启发的新实施方式。
\documentclass[10pt]{scrartcl}
\usepackage[english]{babel}
\usepackage[margin=15mm]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[svgnames,table]{xcolor}
\usepackage{multicol,enumitem,blindtext}
\setlist{leftmargin=*,nosep}
\newcommand{\uchead}[2][DarkBlue]{\textbf{\large\sffamily\color{#1} #2}}
\newcounter{usecase}
\newenvironment{usecase}[1]{
\refstepcounter{usecase}
\noindent\colorbox{gray!20}{%
\makebox[\dimexpr\linewidth-2\fboxsep][l]{%
\uchead{Case~\theusecase}~~\uchead[DarkGreen]{#1}}}\par
\hrule}
{\bigskip}
\newlength\lcol\setlength{\lcol}{1.2cm}
\newcommand{\ucentry}[1]{\noindent\strut\makebox[\lcol][l]{\textbf{#1}}}
\newcommand{\actor}[1]{%
\ucentry{Actor} #1\hrule}
\newcommand{\precondition}[1]{%
\ucentry{Needs} #1\hrule}
\newcommand{\mainpath}[1]{%
\ucentry{Path}
\vspace{-\dimexpr\parskip+\baselineskip}%
\setlist[enumerate]{labelindent=\dimexpr\lcol+\fboxsep} #1\smallskip\hrule}
\setlength{\footskip}{1cm}
\begin{document}
\title{The Title}
\author{Casimir}
\date{\today}
\maketitle
\begin{abstract}
\blindtext
\end{abstract}
\begin{multicols}{2}
\section{First Section}
\blindtext
\subsection{First Subsection}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{\blindenumerate[9]}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{\blindenumerate[9]}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{\blindenumerate[9]}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{\blindenumerate[9]}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{\blindenumerate[9]}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{\blindenumerate[9]}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{\blindenumerate[9]}
\end{usecase}
\end{multicols}
\end{document}
答案1
看起来像列表的东西通常最好设置为列表而不是表格，然后它们会自然断裂。
你可以对间距进行更多的调整，但是：
\documentclass[10pt]{scrartcl}
\usepackage[english]{babel}
\usepackage[margin=15mm]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[svgnames,table]{xcolor}
\usepackage{booktabs,tabularx,multicol,enumitem,blindtext}
\setlist{leftmargin=*,nosep}
\newcommand{\tabhead}[2][DarkBlue]{\textbf{\large\sffamily\color{#1} #2}}
\newcounter{usecase}
\newenvironment{usecase}[1]{
\refstepcounter{usecase}
\colorbox{gray!20}{%
\makebox[2cm][l]{\tabhead{Case~\theusecase}}%
\hspace{6pt}%
\makebox[\dimexpr\linewidth-3cm-6pt-2\fboxsep]{%
\tabhead[DarkGreen]{#1}}}\par
\hrule}
{\hrule\medskip}
\newcommand{\actor}[1]{%
\par
\makebox[2cm][l]{\strut Actor}
\hspace{6pt}%
\mbox{#1}\par\hrule}
\newcommand{\precondition}[1]{%
\par
\makebox[2cm][l]{\strut Needs}
\hspace{6pt}%
\mbox{#1}\par\hrule}
\newcommand{\mainpath}[1]{%
\par
\makebox[2cm][l]{\strut Path}
\par
\nobreak
\vspace{-\dimexpr\parskip+\baselineskip}%
\setlist[enumerate]{leftmargin=2cm}%
\blindenumerate[20]
}
\setlength{\footskip}{1cm}
\begin{document}
\title{The Title}
\author{Casimir}
\date{\today}
\maketitle
\begin{abstract}
\blindtext
\end{abstract}
\begin{multicols}{2}
\section{First Section}
\blindtext
\subsection{First Subsection}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\begin{usecase}{Some use case}
\actor{Some actor}
\precondition{User logged in}
\mainpath{}
\end{usecase}
\end{multicols}
\end{document}