在每个 \item 对象后添加空白而不分页？

Question

我想制作enumerate一个列表，在每个后面添加一定数量的空白行\item，但不允许分页符将\item文本与空白处分开。我的列表是一个问题集，每个问题都有空白处供大家解决，我不希望问题与这个空白处分开。

我目前正在使用以下代码来创建这些空行：

\let\olditem\item
\renewcommand{\item}{\olditem \vspace*{10em}}

这在添加10em垂直空间时非常有效，但实际上每一页的\item最底部都有一个空间，然后\vspace*{10em}在下一页继续。

我怎样才能防止这种情况发生？

Answer 1

没有显示示例，很难确定，但我想这样的事情会做你想要的（用真实代码替换1pt，0pt可见规则仅用于调试）

\documentclass{article}

\usepackage{enumitem}

\begin{document}
\newcommand\myitem{\item\mbox{}\par}
\begin{enumerate}[label={\arabic*)\rule[-10\baselineskip]{1pt}{10\baselineskip}}]
\myitem aaa
\myitem aaa
\myitem aaa
\myitem aaa
\myitem aaa
\myitem aaa
\myitem aaa
\myitem aaa
\myitem aaa
\myitem aaa
\end{enumerate}
\end{document}

Answer 2

根据您的描述，我认为enumerate这不是合适的工具。

你似乎想编写一个包含

• 问题陈述
• 预留工作空间

您希望“粘在一起”。确保这一点的最简单方法是将整个技巧粘在一个小页面内。以下是概念验证。（对于可变高度版本，与 David 的答案相同，将1pt规则中的替换0pt为生产。这1pt只会帮助您直观地了解保留的空间。）

\documentclass[twocolumn]{article}

\newcounter{problemnum}
\newenvironment{problem}{\refstepcounter{problemnum}%
        \par\noindent\begin{minipage}[t]{\linewidth} \noindent \theproblemnum)~}{\rule[-8.5em]{1pt}{8.5em} % This is the amount of vertical space to reserve
\end{minipage}}
\newenvironment{problemfh}{\refstepcounter{problemnum}%
        \par\noindent\begin{minipage}[t][8.5em]{\linewidth}\noindent \theproblemnum)~}{\end{minipage}}

\begin{document}

Variable height version: keeping the same amount of ``work space''. 

\begin{problem}
        This is a math problem
\end{problem}

\begin{problem}
        This is another math problem
\end{problem}

\begin{problem}
        This is a multiline math problem. It is something about chickens and rabbits on a farm, and the counts of how many feet they have altogether and how many mouths they have between them. It has something to do with algebra. 
\end{problem}

\begin{problem}
        This is another short problem
\end{problem}

\begin{problem}
        This problem should straddle the column break and be moved to the second column
\end{problem}

\hrule
The next version has a fixed total height, so the work space shrinks for the longer problem.

\begin{problemfh}
        This is a math problem
\end{problemfh}

\begin{problemfh}
        This is a multiline math problem. It is something about chickens and rabbits on a farm, and the counts of how many feet they have altogether and how many mouths they have between them. It has something to do with algebra. 
\end{problemfh}

\begin{problemfh}
        This is another short problem
\end{problemfh}
\hrule

\end{document}

请注意，在左列中，LaTeX 在问题之间插入了额外的粘连（空格），以使问题分布得更均匀。您可以看到，问题 5 中有足够的空间用于文本，但使用 minipage 会强制将保留的空间放置在与文本相同的“页面”（在本例中为列）上。