如何设置 mdframed 的宽度？

Question

我是乳胶新手，我想设置宽度和高度mdframed。有人可以帮我完成这个任务吗？

\documentclass{article}
\usepackage{xcolor}
\usepackage{mdframed}
\newtheorem{mdtheorem}{Theorem}
 \newenvironment{theorem}%
 {\begin{mdframed}[backgroundcolor=lightgray]\begin{mdtheorem}}%
 {\end{mdtheorem}\end{mdframed}}
\begin{document}
\begin{theorem}
Sample
\end{theorem}
\end{document} 

1. 我当前的输出是，

2. 我的预期输出是

Answer 1

这是一个使用的解决方案varwidth和environ 包。首先\BODY将环境的保存在\usebox使用varwidth环境中，然后测量其宽度以指定环境\userdefinewidth的mdframed：

笔记：

• 包裹showframe​ 仅用于显示页边距。实际使用中不需要它。
• 这是解决方案的一个稍微修改的版本mdframed：根据内容调整框架大小。

代码：

\documentclass{article}
\usepackage{xcolor}
\usepackage{mdframed}
\usepackage{environ}
\usepackage{varwidth}
\usepackage{showframe}

\newlength{\TheoremWidthTweak}%

\NewEnviron{theorem}[1][]{%
    \setlength{\TheoremWidthTweak}{\dimexpr%
        +\mdflength{innerleftmargin}
        +\mdflength{innerrightmargin}
        +\mdflength{leftmargin}
        +\mdflength{rightmargin}
        }%
    \savebox0{%
        \begin{varwidth}{\dimexpr\linewidth-\TheoremWidthTweak\relax}%
            \BODY
        \end{varwidth}%
    }%
    \begin{mdframed}[backgroundcolor=lightgray,userdefinedwidth=\dimexpr\wd0+\TheoremWidthTweak\relax, #1]
        \usebox0
    \end{mdframed}
}

\begin{document}
\begin{theorem}[backgroundcolor=yellow!20]
    Sample
\end{theorem}
\begin{theorem}[backgroundcolor=green!20]
    Somewhat longer text.
\end{theorem}
\begin{theorem}[backgroundcolor=orange!20]
    Much longer text that takes up more than one line. 
    This should span across the entire width of the page and continue on to the next line.
\end{theorem}
\end{document}