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框式列表对象中的中心标题

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框式列表对象中的中心标题

我在 listings 对象中放了一些伪代码，并在其周围加上标题和方框。我已使用此处建议的 fancybox 解决方案来处理 listings 对象：如何将列表居中

一切都很好，除了标题没有居中。

输出如下：

输出带有非中心标题的列表对象

代码如下：

\documentclass[paper=a4, fontsize=11pt]{article} % A4 paper and 11pt font size
\usepackage[top=0.8in, bottom=0.8in, left=0.8in, right=0.8in]{geometry}

\usepackage{fourier} % Use the Adobe Utopia font for the document
\usepackage[english]{babel} % English language/hyphenation

\usepackage{listings}
\lstset{numbers=left, numbersep=10pt, frame = single, framexleftmargin=17pt}

\usepackage{fancybox}
\makeatletter
\newenvironment{CenteredBox}{% 
\begin{Sbox}}{% Save the content in a box
\end{Sbox}\centerline{\parbox{\wd\@Sbox}{\TheSbox}}}% And output it centered
\makeatother

\usepackage{sectsty} % Allows customizing section commands
\allsectionsfont{\centering \normalfont\scshape} % Make all sections centered, the default font and small caps

\begin{document}
\section{Chapter}
\begin{CenteredBox}
\begin{lstlisting}[caption={Cool code},label=cool,linewidth=6in]
validity_type <- 0,1,2
uid <- '00000'
start_date <- '2014-11-20 00:00:00'
end_date <- '2014-11-21 00:00:00'

sql_query <- "SELECT variable_1
         , variable_2
         , variable_3
         FROM prices
         WHERE validity_type = ",validity_type," AND
         uid = '",uid,"'
         GROUP BY variable_1, variable_2, variable_3
         HAVING from_ts >= '",start_date,"' AND from_ts < '",end_date,"'
         ORDER BY variable_1 ASC, variable_2 ASC")
\end{lstlisting}
\end{CenteredBox}

\end{document}

任何帮助深表感谢。

答案1

这里有几件事。首先，法线lstlisting是左对齐的。此外，行号（通常）是左重叠的，因此突出到左边距。最后，OP 的 MWE 任意选择 6in 作为列表行宽，这个数字与 并没有内在联系\textwidth。

如果不使用CenteredBox环境，标签将居中。但是，当lstlisting框居中时，标签会随之向右移动。这需要进行两项更改，既要将标签带回中心，又要将框居中：

  1. 首先，我通过在标题后添加空格将标题居中，如caption={Cool code\hspace{\dimexpr\textwidth-6in+2ex}}。 部分\textwidth-6in表示文本宽度和指定宽度之间的差异lstlisting，而 2ex 是我对列表左边缘两位数标签产生的额外重叠宽度的估计。

  2. \hspace{\dimexpr.5\textwidth-3in+1ex}我做的另一件事是在列表末尾添加空格，以便将列表向左移动。请注意，此距离恰好是添加到标题宽度的 1/2。

\documentclass[paper=a4, fontsize=11pt]{article} % A4 paper and 11pt font size
\usepackage[top=0.8in, bottom=0.8in, left=0.8in, right=0.8in]{geometry}

\usepackage{fourier} % Use the Adobe Utopia font for the document
\usepackage[english]{babel} % English language/hyphenation

\usepackage{listings}
\lstset{numbers=left, numbersep=10pt, frame = single, framexleftmargin=17pt}

\usepackage{fancybox}
\makeatletter
\newenvironment{CenteredBox}{% 
\begin{Sbox}}{% Save the content in a box
\end{Sbox}\centerline{\parbox{\wd\@Sbox}{\TheSbox}}}% And output it centered
\makeatother

\usepackage{sectsty} % Allows customizing section commands
\allsectionsfont{\centering \normalfont\scshape} % Make all sections centered, the default font and small caps

\begin{document}
\section{Chapter}
\noindent\rule{.5\textwidth}{2pt} this line is .5 textwidth

\begin{CenteredBox}
\begin{lstlisting}[caption={Cool code\hspace{\dimexpr\textwidth-6in+2ex}},%
   label=cool,linewidth=6in]
validity_type <- 0,1,2
uid <- '00000'
start_date <- '2014-11-20 00:00:00'
end_date <- '2014-11-21 00:00:00'

sql_query <- "SELECT variable_1
         , variable_2
         , variable_3
         FROM prices
         WHERE validity_type = ",validity_type," AND
         uid = '",uid,"'
         GROUP BY variable_1, variable_2, variable_3
         HAVING from_ts >= '",start_date,"' AND from_ts < '",end_date,"'
         ORDER BY variable_1 ASC, variable_2 ASC")
\end{lstlisting}
\hspace{\dimexpr.5\textwidth-3in+1ex}
\end{CenteredBox}

\medskip
\noindent\hrulefill\\
the above line is textwidth

\end{document}

在此处输入图片描述

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