格式化 - minipage 恢复缩进

Question

您可以在以下位置找到 LaTeX 的源代码来源2e。在 TeX Live 中，该命令texdoc source2e将打开相应的 PDF 文档；然后您可以使用 PDF 查看器的搜索功能或索引来查找您要查找的内容（例如，的注释源代码minipage）。

另一种方法是查看latex.ltx应该是 TeX 发行版的一部分的文件，但它没有注释。latex.ltx是许多文件的汇编，注释被删除。的源文件minipage称为ltboxes.dtx，如果您有 TeX 发行版的源代码，您可能会找到它。

如果你查看其中一个文件，你会看到，在 minipage 中，\parindent和\parskip都设置为零（\@parboxrestore从调用\@iiiminipage，它本身直接和间接地从调用\minipage）。因此，如果你在 minipage 中看到文本缩进，则它要么出去小页面（一个框）或已在内部明确打开（当然，这两种可能性在视觉上是不同的）。

我相信以下示例的扩展版本应该可以帮助您理解这一点，并或多或少地做您想做的事情。请注意在的定义中使用\xdef而不是。这样，您可以执行以下操作：\edef\saveparinfo

{%
  \parindent=4em\relax
  \saveparinfo{four em}%
  Foo bar.\par}

\useparinfo{four em}%
Etc.

否则会导致错误，因为使用\edef，用于存储已保存参数的宏只会在组内定义。\xdef使这些宏\global就像使用定义的宏一样\newcommand。现在，我承诺的完整示例。:-)

\documentclass[11pt,a4paper]{article}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{lipsum}
\usepackage{calc}

\makeatletter

% Command to save \parindent and \parskip under a specific key. The argument
% is the key and can even contain non-letters (e.g., hyphens or spaces).
\newcommand*{\saveparinfo}[1]{%
  \expandafter\xdef\csname my@#1@parindent\endcsname{\the\parindent}%
  \expandafter\xdef\csname my@#1@parskip\endcsname{\the\parskip}%
}

% Restore parameters that were saved under the specified key.
\newcommand*{\useparinfo}[1]{%
  \parindent=\csname my@#1@parindent\endcsname \relax
  \parskip=\csname my@#1@parskip\endcsname \relax
}

\makeatother

% Like minipage, but suppresses indentation if used in vertical mode (i.e.,
% before a paragraph has been started).
\newenvironment{myMinipage}{%
  % If we are about to start a paragraph, the indentation box will be *out*
  % of the minipage -> empty it first.
  \noindent
  \minipage    % like \begin{minipage} but gives nicer error handling here
}{%
  \endminipage % ditto for \end{minipage}
}

\newcommand*{\nextSample}{\bigskip\filbreak}


\begin{document}
\section{My section}
\subsection{Example of indented text and non-indented in minipage}

\lipsum[1-2]
\bigskip

\parindent=0pt\relax % Suppress paragraph indentation and save parameters
\saveparinfo{zero}%
No indentation. We saved the \verb|\parindent| and \verb|\parskip| parameters
under key \texttt{zero}.
\nextSample

\begin{myMinipage}{\linewidth}
  This is a long text to fill the line until a linebreak appears. Bla bla
  bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla.

  And there is no indentation for any paragraph.
\end{myMinipage}
\nextSample

\parindent=1em\relax
\saveparinfo{oneem}%
Now, paragraphs are indented. We saved the \verb|\parindent| and
\verb|\parskip| parameters under key \texttt{oneem}. Bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla bla.

Another paragraph with the same parameters. Bla bla bla bla bla bla bla
bla bla bla bla bla bla bla bla bla bla bla.
\nextSample

\begin{myMinipage}{\linewidth}
  Here, paragraphs are not indented. \lipsum[1]

  Other paragraph inside the minipage. No indentation.
\end{myMinipage}
\nextSample

\begin{minipage}{\linewidth-\parindent} % real minipage environment
  Here, the whole minipage is preceded by an indentation box, but there is
  no indentation for paragraphs \emph{inside} the minipage.

  \lipsum[1]
\end{minipage}
\nextSample

\begin{myMinipage}{\linewidth}\useparinfo{zero}%
  This minipage starts at the left margin and has no indentation for its
  paragraphs (this was restored using key \texttt{zero}).

  \lipsum[1]
\end{myMinipage}
\nextSample

\begin{myMinipage}{\linewidth}\useparinfo{oneem}%
  This minipage starts at the left margin and has one em indentation for
  each paragraph (this was restored using key \texttt{oneem}).

  \lipsum[1]
\end{myMinipage}
\end{document}

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Answer 1