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拆分列中的文本

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拆分列中的文本

当某一列的内容太长而无法放在一行中时，如果该列的宽度可变（例如下面示例中的第 2 列），我该如何让 TeX 将内容分成多行？

\offinterlineskip\tabskip=0pt
\halign to.5\hsize{
   \vrule#\strut&
   \hfil\enskip#\enskip&
   \vrule#&
   \enskip#\enskip\hfil\tabskip0pt plus1fil&
   \vrule#\tabskip0pt
\cr\noalign{\hrule}
   &\omit\hfil\enskip\bf ID\enskip\hfil&
   &\omit\span\omit\hfil\enskip\bf Description\enskip\hfil\vrule
\cr\noalign{\hrule}
   &1&
   &A description that should be broken up across several lines&
\cr\noalign{\hrule}
   &1~000&
   &A description that fits a single line&
\cr\noalign{\hrule}
   &1~000~000&
   &Another short description&
\cr\noalign{\hrule}}
\end

在此处输入图片描述

答案1

在 a 中排版表格\vbox，获取最后一行并将其拆分以获取第一列的宽度。然后以适当的方式设置第二列的大小。

\def\myhalign#1{%
  \setbox0=\vbox{
    \tabskip=0pt
    \halign{&##\cr#1}
    \setbox0=\lastbox
    \setbox0=\hbox{\unhbox0
      \unskip % tabskip glue
      \setbox0=\lastbox % third rule
      \unskip % tabskip glue
      \setbox0=\lastbox % second column
      \unskip % tabskip glue
      \setbox0=\lastbox % second rule
      \unskip % tabskip glue
      \setbox0=\lastbox % first column
      \global\dimen1=\wd0
    }%
  }%
  \dimen0=.5\hsize
  \advance\dimen0 by -1.2pt % the rules
  \advance\dimen0 by -2em % the padding
  \advance\dimen0 by -\dimen1 % the first column
  \vbox{
    \offinterlineskip\tabskip=0pt
    \everycr{\noalign{\hrule}}
    \halign{%
      \vrule##\strut&
      \hfil\enskip##\enskip&
      \vrule##&
      \enskip\vtop{
        \normalbaselines
        \hsize=\dimen0
        \parindent=0pt
        \strut##\strut
      }\enskip\hfil&
      \vrule##\cr
      #1\crcr
    }%
  }%
}

\noindent\vrule height 0.4pt width .5\hsize

\medskip

\myhalign{
   &\omit\hfil\enskip\bf ID\enskip\hfil&
   &\omit\span\omit\hfil\enskip\bf Description\enskip\hfil\vrule
\cr
   &1&
   &A description that should be broken up across several lines&
\cr
   &1~000&
   &A description that fits a single line&
\cr
   &1~000~000&
   &Another short description&
\cr
}


\bye

在此处输入图片描述

答案2

在此处输入图片描述

\offinterlineskip\tabskip=0pt
\setbox0\hbox{\enskip1~000~000\enskip}
\newdimen\foo
\foo=.5\hsize
\advance\foo-\wd0
\advance\foo-1.2pt% 3 rules
\halign to.5\hsize{
   \vrule#\strut&
   \hfil\enskip#\enskip&
   \vrule#&
   \vtop\bgroup\hsize\foo\normalbaselines
\parindent0pt
\leftskip.5em\rightskip.5em plus 3cm#\ifhmode\unskip\strut\fi\egroup&
   \vrule#
\cr\noalign{\hrule}
   &\omit\hfil\enskip\bf ID\enskip\hfil&
   &\omit\span\omit\hfil\enskip\bf Description\enskip\hfil\vrule
\cr\noalign{\hrule}
   &1&
   &A description that should be broken up across several lines&
\cr\noalign{\hrule}
   &1~000&
   &A description that fits a single line&
\cr\noalign{\hrule}
   &1~000~000&
   &Another short description&
\cr\noalign{\hrule}}
\end

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