我為報價環境編寫了一些程式碼。我希望報價僅在足夠短以適合一行時才居中,否則不應居中。這是程式碼
\documentclass{article}
\usepackage{changepage, xparse}
\ExplSyntaxOn
\NewDocumentEnvironment{ myquote }{ o }{
\begin{center}
\begin{adjustwidth}{50pt}{50pt}
\begin{itshape}
}{
\end{itshape}
\end{adjustwidth}
\end{center}
\IfValueT{ #1 }{
\vspace{-0.15cm}
\begin{adjustwidth}{0pt}{20pt}
\flushright { \small -\hspace{2pt}#1\hspace{2pt}- }
\end{adjustwidth}
\vspace{0.3cm}
}
}
\ExplSyntaxOff
\begin{document}
\begin{myquote}[Someone]
This should be centered.
\end{myquote}
\begin{myquote}[Someone else]
This is a longer quote and therefore shouldn't be centered. This is some more text.
\end{myquote}
\end{document}
我怎麼能這樣做呢?
答案1
這使用, 並檢查內部\NewEnviron
斜體的寬度。如果小於,則在前面新增一個。\BODY
\hbox
\linewidth
\hfil
\BODY
\documentclass{article}
\usepackage{changepage, environ}
\usepackage[pass,showframe]{geometry}
\NewEnviron{myquote}[1][\relax]{
\begin{center}
\begin{adjustwidth}{50pt}{50pt}
\setbox0=\hbox{\itshape\BODY}%
\begin{itshape}
\ifdim\wd0>\linewidth\relax\BODY\else\hfil\BODY\fi
\end{itshape}
\end{adjustwidth}
\end{center}
\ifx\relax#1\relax\else
\vspace{-0.15cm}
\begin{adjustwidth}{0pt}{20pt}
\flushright { \small -\hspace{2pt}#1\hspace{2pt}- }
\end{adjustwidth}
\vspace{0.3cm}
\fi
}
\begin{document}
\begin{myquote}[Someone]
This should be centered.
\end{myquote}
\begin{myquote}[Someone else]
This is a bit longer, but should still be centered.
\end{myquote}
\begin{myquote}[Someone else]
This is a longer quote and therefore shouldn't be centered. This is some more text.
\end{myquote}
\end{document}