如何在 tcolorbox 中通过另一个选项的值设置一个选项的值

Question

在以下示例中，我想leftright skip自动计算/设置的值。该怎么做？

\documentclass{article}
    \usepackage{tcolorbox}
    \begin{document}
    
    \begin{tcolorbox}[width=0.6\textwidth]
      when the value of "left skip" is not given explictly, I want to set the value of "leftright skip" to (\textwidth - width)/2 automatically(implictly). What shall I do?
    \end{tcolorbox}
    
    \end{document}

Answer 1

您可以为 定义一个宏width，并将\dimexpr该宏用于leftrightskip。如下所示：

\documentclass{article}
\usepackage{showframe}
\usepackage{tcolorbox}
\newlength{\tcbwd}
\setlength{\tcbwd}{0.6\linewidth}
\begin{document}
\begin{tcolorbox}[leftright skip=\dimexpr(\linewidth-\tcbwd)/2,width=\tcbwd]
      when the value of "left skip" is not given explictly, I want to set the value of "leftright skip" to ($\backslash$textwidth - width)/2 automatically(implictly). What shall I do?
\end{tcolorbox}
\end{document}