如何将预定义的抽象环境垂直居中于文本主体的中间？

Question

我从下面获取了低级 TeX 代码在书中定义抽象环境定义了摘要的环境。但是，当我将它放入我的作品中时，我使用的notitlepage选项会导致摘要垂直对齐到顶部。如下所示，摘要文本与可用宽度不对齐；左右两侧都有空白。

现在，我希望整个摘要（标题和文本）垂直对齐到文本主体的中心，并完全对齐文本以尽可能节省空间。

以下是代码：

\documentclass[notitlepage]{book}
\usepackage[no-math]{fontspec}
\usepackage[inline]{enumitem}
\usepackage{blindtext}
\usepackage[showframe]{geometry}
\usepackage{tocloft}
\usepackage{etoolbox}
\patchcmd{\frontmatter}{\pagenumbering{roman}}{\pagenumbering{Roman}}{}{}

% ===== Define abstract environment =====
\makeatletter
\if@titlepage
\newenvironment{abstract}{%
    \titlepage
    \null\vfil
    \@beginparpenalty\@lowpenalty
    \begin{center}%
        \bfseries \abstractname
        \@endparpenalty\@M
\end{center}}%
{\par\vfil\null\endtitlepage}
\else
\newenvironment{abstract}{%
    \if@twocolumn
    \section*{\abstractname}%
    \else
    \small
    \begin{center}%
        {\bfseries \abstractname\vspace{-.5em}\vspace{\z@}}%
    \end{center}%
    \quotation
    \fi}
{\if@twocolumn\else\endquotation\fi}
\fi
\makeatother


\begin{document}




\frontmatter

\pagestyle{plain}

\tableofcontents


\pagestyle{headings}

\cleardoublepage
\begin{abstract}
    \thispagestyle{plain}
    \blindtext
\end{abstract}
\phantomsection \addcontentsline{toc}{chapter}{\abstractname}


\cleardoublepage
\phantomsection \addcontentsline{toc}{chapter}{\listfigurename}
\listoffigures

\cleardoublepage
\phantomsection  \addcontentsline{toc}{chapter}{\listtablename}
\listoftables


\mainmatter

\Blinddocument
\Blinddocument
\Blinddocument


\end{document}

Answer 1

永远不要只是复制/粘贴代码。你需要先理解它。

\documentclass[notitlepage]{book}
%\usepackage[no-math]{fontspec}
\usepackage[inline]{enumitem}
\usepackage{blindtext}
\usepackage[showframe]{geometry}
\usepackage{tocloft}
\usepackage{etoolbox}

\patchcmd{\frontmatter}{\pagenumbering{roman}}{\pagenumbering{Roman}}{}{}

% ===== Define abstract environment =====
\newenvironment{abstract}{%
    \clearpage
\vspace*{\fill}
    \small
    \begin{center}%
    {\bfseries Abstract}
    \phantomsection \addcontentsline{toc}{chapter}{Abstract}
    \thispagestyle{plain}
\end{center}%
}
{\vspace*{\fill}
}


\begin{document}




\frontmatter

\pagestyle{plain}

\tableofcontents


\pagestyle{headings}

\cleardoublepage
\begin{abstract}
\blindtext
\end{abstract}


\cleardoublepage
\phantomsection \addcontentsline{toc}{chapter}{\listfigurename}
\listoffigures

\cleardoublepage
\phantomsection  \addcontentsline{toc}{chapter}{\listtablename}
\listoftables


\mainmatter

\Blinddocument
\Blinddocument
\Blinddocument


\end{document}