我的书里有几封信，有些很短，用 scrbook、reledmac 排版\raggedbottom。\chapter用于年并\section用于个别字母。
我需要这个leavevmode命令，因为当字母数量过多时，它会重置某些内容。但这会在字母标题后引入不必要的分页符。为什么会这样？我该如何调整部分命令以达到所需的效果？
梅威瑟：
\documentclass{scrbook}
\usepackage{reledmac}
\usepackage[english]{babel}
\usepackage{blindtext}
\raggedbottom
\begin{document}
\chapter{Letters from 1900}
\leavevmode\pagebreak[3]\section{Letter 1}\nopagebreak[3]
\beginnumbering
\pstart
\blindtext
\pend
\pstart
\blindtext
\pend
\endnumbering
\leavevmode\pagebreak[3]\section{Letter 2}\nopagebreak[3]
\beginnumbering
\pstart
\blindtext
\pend
\endnumbering
\leavevmode\pagebreak[3]\section{Letter 3}\nopagebreak[3]
\beginnumbering
\pstart
\blindtext
\pend
\endnumbering
\end{document}
这是不想要的结果：
答案1
据我所知，\leavevmode由于节标题前有一个额外的空白段落，因此会产生额外的垂直空间。这不是问题，因为它不允许在以下内容后分页\section。
问题出\pagenumbering在 之后\section。您应该\nopagebreak在 之后添加/移动\pagenumbering：
\documentclass{scrbook}
\usepackage{reledmac}
\usepackage[english]{babel}
\usepackage{blindtext}
\raggedbottom
\begin{document}
\chapter{Letters from 1900}
\leavevmode\pagebreak[3]\section{Letter 1}
\beginnumbering\nopagebreak
\pstart
\blindtext
\pend
\pstart
\blindtext
\pend
\endnumbering
\leavevmode\pagebreak[3]\section{Letter 2}
\beginnumbering\nopagebreak
\pstart
\blindtext
\pend
\endnumbering
\leavevmode\pagebreak[3]\section{Letter 3}
\beginnumbering\nopagebreak
\pstart
\blindtext
\pend
\endnumbering
\end{document}
但是，如果您确实想要在部分之前有额外的垂直空间，为什么要使用\leavevmode它来获取它而不是使用它\RedeclareSectionCommand来增加beforeskip值：
\documentclass{scrbook}
\usepackage{reledmac}
\usepackage[english]{babel}
\usepackage{blindtext}
\raggedbottom
\RedeclareSectionCommand[beforeskip=-10ex plus -1ex minus -.2ex]{section}
\begin{document}
\chapter{Letters from 1900}
\section{Letter 1}
\beginnumbering\nopagebreak
\pstart
\blindtext
\pend
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 2}
\beginnumbering\nopagebreak
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 3}
\beginnumbering\nopagebreak
\pstart
\blindtext
\pend
\endnumbering
\end{document}
如果\beginnumbering都要避免分页符，则可以修补命令：
\documentclass{scrbook}
\usepackage{reledmac}
\usepackage[english]{babel}
\usepackage{blindtext}
\raggedbottom
\RedeclareSectionCommand[beforeskip=-10ex plus -1ex minus -.2ex]{section}
\usepackage{xpatch}
\xapptocmd{\beginnumbering}{\nopagebreak}{}{}
\begin{document}
\chapter{Letters from 1900}
\section{Letter 1}
\beginnumbering
\pstart
\blindtext
\pend
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 2}
\beginnumbering
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 3}
\beginnumbering
\pstart
\blindtext
\pend
\endnumbering
\end{document}
或者你可以定义一个新命令：
\documentclass{scrbook}
\usepackage{reledmac}
\usepackage[english]{babel}
\usepackage{blindtext}
\raggedbottom
\RedeclareSectionCommand[beforeskip=-10ex plus -1ex minus -.2ex]{section}
\newcommand\beginnumberingnobreak{\beginnumbering\nopagebreak}
\begin{document}
\chapter{Letters from 1900}
\section{Letter 1}
\beginnumberingnobreak
\pstart
\blindtext
\pend
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 2}
\beginnumberingnobreak
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 3}
\beginnumberingnobreak
\pstart
\blindtext
\pend
\endnumbering
\end{document}
您还可以尝试检测是否\beginnumbering遵循\section另一个命令来防止分页：
\documentclass{scrbook}
\usepackage{reledmac}
\usepackage[english]{babel}
\usepackage{blindtext}
\raggedbottom
\RedeclareSectionCommand[beforeskip=-10ex plus -1ex minus -.2ex]{section}
\usepackage{xpatch}
\makeatletter
\xpretocmd{\beginnumbering}{\if@nobreak\let\afterbeginnumbering\nopagebreak\else\let\afterbeginnumbering\relax\fi}{}{}
\xapptocmd{\beginnumbering}{\afterbeginnumbering}{}{}
\makeatother
\begin{document}
\chapter{Letters from 1900}
\section{Letter 1}
\beginnumbering
\pstart
\blindtext
\pend
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 2}
\beginnumbering
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 3}
\beginnumbering
\pstart
\blindtext
\pend
\endnumbering
\end{document}
答案2
如果您从示例文档中删除\leavevmode和\nopagebreak，则标题不在页面末尾，因为虚假的白色段落已经\leavevmode消失，但如果您添加更多行（如下所示），则页面会在标题后中断。这是由于和，\beginnumbering如果您取消注释重新定义，则可防止在该点处出现分页，并且标题中会保留一行额外的行。
\documentclass{scrbook}
\usepackage{reledmac}
\usepackage[english]{babel}
\usepackage{blindtext}
\raggedbottom
\let\oldbeginnumbering\beginnumbering
%\def\beginnumbering{\oldbeginnumbering\par\nopagebreak}
\begin{document}
\chapter{Letters from 1900}
\section{Letter 1}
\beginnumbering
\pstart
\blindtext
\pend
\pstart
\blindtext
\pend
\endnumbering
\section{Letter 2}
\beginnumbering
\pstart
\blindtext
a\\ba\\c
\pend
\endnumbering
\section{Letter 3}
\beginnumbering
\pstart
\blindtext
\pend
\endnumbering
\end{document}