为 tcolorbox 定义自定义选项键

Question

我想为自定义tcolorbox环境实现一个选项键，当我将其包含在可选参数中时，它会扩展为类似的内容underlay = {<tikz code>}。

在下面的代码中，我想underlay = {...}用一个简单的键替换quotation。我的目标是像这样重现第二个框：\begin{sigbox}[quotation]

\documentclass[11pt]{scrreprt}
\usepackage{lipsum}
\usepackage[skins]{tcolorbox}
%
%
\newtcolorbox{sigbox}[1][]{%
    enhanced, remember, colback=yellow!25!white, arc=0pt, boxrule=0pt, leftrule=3 ex %
, colframe=yellow!85!red!33!white %
, underlay = {%
    \path[fill=yellow!25!white] (frame.south west) -- ([yshift=3 ex]frame.south west) -- 
    ([xshift = 1.5 ex ,yshift=1.5 ex]frame.south west) -- ([xshift = 3 ex , % 
    yshift = 3 ex]frame.south west) -- ([xshift = 3 ex]frame.south west) -- cycle;
    }%
, overlay = {%
    \path ([xshift=1.5 ex, yshift = -2.25 ex]frame.north west) node %
    {\textcolor{tcbcolback!33!white}{\LARGE\textbf{!}}};%
    }%
     ,#1 %
     }%
     %
\begin{document}
%
\begin{sigbox}
\lipsum[7]
\end{sigbox}
%
\begin{sigbox}[%
underlay = {%
    \path ([xshift=1.5 ex, yshift = -5.5 ex]frame.north west) node %
    {\textcolor{tcbcolback!33!white}{\LARGE\textbf{"}}};%
    }%
]%
\lipsum[8]
\end{sigbox}
%
\end{document}

我是否应该仅创建一个宏 ala \newcommand{\quotation}{underlay = {<tikz code>}}；我可以使用例如一些条件表达式来实现它吗xstring；或者我必须学习如何pgfkeys工作？

Answer 1

我认为您正在寻找的是\tcbset可以帮助您创建自定义样式的东西（我稍微简化了代码）：

\documentclass[11pt]{scrreprt}
\usepackage{lipsum}
\usepackage[skins]{tcolorbox}

\tcbset{
    quotation/.style={
        overlay = {
            \node[text=tcbcolback!33!white, font=\LARGE\bfseries] at 
                ([xshift=1.5ex, yshift=-2.25ex]frame.north west) {"};
        }
    }
}

\newtcolorbox{sigbox}[1][]{
    enhanced, remember, colback=yellow!25!white, arc=0pt, boxrule=0pt, leftrule=3ex, colframe=yellow!85!red!33!white,
    underlay = {
        \path[fill=yellow!25!white] (frame.south west) -- 
            ([yshift=3ex]frame.south west) -- 
            ([xshift=1.5ex, yshift=1.5ex]frame.south west) -- 
            ([xshift=3ex, yshift=3ex]frame.south west) -- 
            ([xshift=3ex]frame.south west) -- cycle;
        },
    overlay = {
        \node[text=tcbcolback!33!white, font=\LARGE\bfseries] at 
            ([xshift=1.5ex, yshift=-2.25ex]frame.north west) {!};
    },
    #1 
}

\begin{document}

\begin{sigbox}
\lipsum[2]
\end{sigbox}

\begin{sigbox}[quotation]
\lipsum[2]
\end{sigbox}

\end{document}

当然，您应该始终小心，不要覆盖现有的样式。