尝试缩进插入小节时出错

Question

由于某种原因，我无法使用\subsubsection{}该选项缩进由包格式化的段落。run-in 选项用于使段落紧跟在标题之后，在本例中，我将其留空并仅使用数字。titlesec[runin]\subsubsection{}

文件：

\documentclass{article}
\usepackage{titlesec}

\setcounter{secnumdepth}{3}
\titleformat{\subsection}[runin]{}{\thesubsection.}{3pt}{}
\titleformat{\subsubsection}[runin]{}{\thesubsubsection.}{3pt}{}

\begin{document}

\section{This is a section}

\subsection{} This is a paragraph:

\begin{quote}
\subsubsection{} This is a sub-paragraph I want to indent.
\end{quote}

{\addtolength{\leftskip}{5mm}
\subsubsection{} This is a sub-paragraph I want to indent.
}

\end{document}

这将生成以下输出：

请注意，第一种方法有效，但是会产生错误：

出现问题 — — 可能缺少某个 \item。

第二种方法什么也不做。

现在，如果我删除该[runin]选项，这两种方法都会按预期工作。似乎该[runin]选项会干扰缩进。但是，尽管存在错误，但第一种方法似乎可以生成所需的文档。有什么想法可以消除错误吗？

Answer 1

最好使用\titlespacing。最后两个参数取自中的值article.cls。

\documentclass{article}
\usepackage{titlesec}
\usepackage{lipsum}

\setcounter{secnumdepth}{3}
\titleformat{\subsection}[runin]{}{\thesubsection.}{3pt}{}
\titleformat{\subsubsection}[runin]{}{\thesubsubsection.}{3pt}{}
\titlespacing{\subsubsection}{\parindent}{3.25ex plus 1ex minus .2ex}{1.5ex plus .2ex}

\begin{document}

\section{This is a section}
\lipsum[2]

\subsection{} This is a paragraph:
\lipsum[2]

\subsubsection{} This is a sub-paragraph I want to indent.
\lipsum[2-3]

\end{document}

如果你想缩进整个块，那么adjustwidth可以这样做，但出于实现原因，你需要发出\mbox{}\vspace{-\baselineskip}。问题是adjustwidth作为列表实现的，这与运行标题冲突。

\documentclass{article}
\usepackage{titlesec}
\usepackage{changepage}
\usepackage{lipsum}

\setcounter{secnumdepth}{3}
\titleformat{\subsection}[runin]{}{\thesubsection.}{3pt}{}
\titleformat{\subsubsection}[runin]{}{\thesubsubsection.}{3pt}{}

\begin{document}

\section{This is a section}
\lipsum[2]

\subsection{} This is a paragraph:
\lipsum[2]

\begin{adjustwidth}{\parindent}{0pt}\mbox{}\vspace{-\baselineskip}
\subsubsection{} This is a sub-paragraph I want to indent.
\lipsum[2-3]
\end{adjustwidth}

\end{document}

在适当的环境下可能更好的实现：

\documentclass{article}
\usepackage{titlesec}
\usepackage{changepage}
\usepackage{xpatch}
\usepackage{lipsum}

\setcounter{secnumdepth}{3}

\let\subsubaw\adjustwidth
\xpatchcmd{\subsubaw}
  {\topsep}
  {\labelwidth=0pt \labelsep=0pt \topsep}
  {}{}
\xpatchcmd{\subsubaw}
  {\item[]}
  {\refstepcounter{subsubsection}\item[\thesubsubsection.\hspace{3pt} ]}
  {}{}
\newenvironment{subsub}
 {\par\addvspace{3.25ex plus 1ex minus .2ex}%
  \subsubaw{\parindent}{0pt}}
 {\endadjustwidth}

\titleformat{\subsection}[runin]{}{\thesubsection.}{3pt}{}

\begin{document}

\section{This is a section}
\lipsum[2]

\subsection{} This is a paragraph:
\lipsum[2]

\begin{subsub}
This is a sub-paragraph I want to indent.
\lipsum[2-3]
\end{subsub}

\end{document}