我想要获得特定的布局，如下所示：在一行中的某个点，我想“切换到段落模式”（就像 aparbox所做的那样），然后在其他某个点，我想恢复到正常的全宽排版。就我而言，我的想法是使用 获得类似目录的外观dotfill，但我想这个问题也代表常规文本。
使用该xcoffins包我得到了这个部分解决方案（下面的 MNWE），它在代码方面既不是很优雅，在结果方面也不正确：
我的问题（上图箭头所示）：
- 这是正确的™方法吗？
- 我希望“点填充”一直到右边距。使用两个
\dotfill命令似乎可行，但结果看起来不太正确（参见图片，两个点填充之间有多余的空间）。有办法解决这个问题吗？ - 如何修复棺材下方错误的行间距？在“中心列”，我希望所有行均等分布。
- 有没有更优雅的方式来水平连接两个带有相邻文本的棺材？ 在这里，我将其连接起来
bol并para留有明确的.5ex间距，但感觉不对（尽管看起来还可以）。
。
\documentclass{minimal}
\setlength{\parindent}{0pt}
\usepackage{xcoffins}
\begin{document}
\NewCoffin\cont% full-width container
\NewCoffin\para% multiline paragraph
\NewCoffin\bol % beginning of line
\NewCoffin\eol % end of line
\SetVerticalCoffin\cont{\linewidth}{~}
\SetHorizontalCoffin\bol{In-coffin beginning of line.}
\SetVerticalCoffin\para{15 em}{Dummy text but long enough to span several lines at the specified width\dotfill}
\JoinCoffins \bol[B,r] \para[T,l](.5ex, 0pt)
\JoinCoffins \cont[B,l] \bol
\SetVerticalCoffin \eol {\CoffinWidth\cont - \CoffinWidth\bol}{\dotfill\rule{1ex}{1ex}}
\JoinCoffins \cont[\para-B,\para-r] \eol
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
\TypesetCoffin\cont
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
\end{document}
答案1
以下是对您的 MWE 进行的两项小调整，可产生所需的结果。
第一个调整是\eol在将棺材连接到棺材上时将其稍微向左移动\cont。.22em是用于包含单个点的框的空间的一半\dotfill。根据需要调整它。虽然现在间隙不太明显，但您可能需要稍微大一点的调整才能完美匹配。
\JoinCoffins \cont[\para-B,\para-r] \eol (-.22em,0pt)
第二个调整涉及\strut在最后一行添加\para。我不知道为什么这是必要的，因为我不知道为什么使用棺材（底层expl3函数或xcoffins）会在这里失去垂直间距。
\SetVerticalCoffin\para{15 em}{Dummy text but long enough to span several lines at the specified width \strut\dotfill}
结果如下：
完整代码：
\documentclass{article}
\setlength{\parindent}{0pt}
\usepackage{xcoffins}
\begin{document}
\NewCoffin\cont% full-width container
\NewCoffin\para% multiline paragraph
\NewCoffin\bol % beginning of line
\NewCoffin\eol % end of line
\SetVerticalCoffin\cont{\linewidth}{~}
\SetHorizontalCoffin\bol{In-coffin beginning of line.}
\SetVerticalCoffin\para{15 em}{Dummy text but long enough to span several lines at the specified width \strut\dotfill}
\JoinCoffins \bol[B,r] \para[T,l](.5ex, 0pt)
\JoinCoffins \cont[B,l] \bol
\SetVerticalCoffin \eol {\CoffinWidth\cont - \CoffinWidth\bol}{\dotfill\rule{1ex}{1ex}}
\JoinCoffins \cont[\para-B,\para-r] \eol (-.22em,0pt)
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
\TypesetCoffin\cont
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
\end{document}
答案2
不用棺材你也可以做到：
\documentclass{article}
\newenvironment{almostcenter}
{\par\nobreak
\leftskip=\dimexpr(\textwidth-15em)/2\relax
\rightskip=\leftskip
\parfillskip=-\rightskip
\noindent\ignorespaces}
{\unskip\dotfill\par\noindent\ignorespacesafterend}
\begin{document}
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
\begin{almostcenter}
Dummy text but long enough to span several lines at the specified width
\end{almostcenter}
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
A long chunk of text to show how the thing flows with surrounding lines.
\end{document}
