防止外部列表分离影响嵌套的内部列表

Question

\itemsep我在d 环境中增加了列表项之间的间隔itemize。如何以最小的努力保持内部列表的项目间隔不受影响？一个临时解决方案可能是手动减少\itemsep内部列表的值。有没有一种优雅的方法来实现同样的效果？

\documentclass{llncs}

\begin{document}

\begin{itemize} \itemsep2em

    \item \textbf{L11}: This is level 1 item

        \begin{itemize}
            \item \textbf{L21}: This is level 2 item
            \item \textbf{L22}: This is level 2 item
            \item \textbf{L23}: This is level 2 item
            \item \textbf{L24}: This is level 2 item
        \end{itemize}

    \item \textbf{L12}: This is level 1 item
    \item \textbf{L13}: This is level 1 item
    \item \textbf{L14}: This is level 1 item

\end{itemize}

\end{document}

Answer 1

您不会在 article 等标准类中看到这种效果，因为它定义了内部列表的命令，以便它们重置 \itemsep。但您可以在使用 llncs 时添加类似的功能：

\documentclass{llncs}

\usepackage{etoolbox}
\makeatletter
 \appto\@listii{\itemsep=0pt}
\makeatother
\begin{document}

\begin{itemize} \itemsep2em

    \item \textbf{L11}: This is level 1 item

        \begin{itemize}
            \item \textbf{L21}: This is level 2 item
            \item \textbf{L22}: This is level 2 item
            \item \textbf{L23}: This is level 2 item
            \item \textbf{L24}: This is level 2 item
        \end{itemize}

    \item \textbf{L12}: This is level 1 item
    \item \textbf{L13}: This is level 1 item
    \item \textbf{L14}: This is level 1 item

\end{itemize}

\end{document}

您还可以使用 enumitem 来设置类似的效果：

\usepackage{enumitem}
\setlist[1]{itemsep=2cm}
\setlist[2]{itemsep=0pt}

Answer 2

您可以将其保存\itemsep为\myitemsep，然后将其用于内部列表。

\documentclass{llncs}
\usepackage{enumitem}
\newlength{\myitemsep}
\setlength{\myitemsep}{\itemsep}
\begin{document}

\begin{itemize}[itemsep=2em]
    \item \textbf{L11}: This is level 1 item
        \begin{itemize}[itemsep=\myitemsep]
            \item \textbf{L21}: This is level 2 item
            \item \textbf{L22}: This is level 2 item
            \item \textbf{L23}: This is level 2 item
            \item \textbf{L24}: This is level 2 item
        \end{itemize}

    \item \textbf{L12}: This is level 1 item
    \item \textbf{L13}: This is level 1 item
    \item \textbf{L14}: This is level 1 item

\end{itemize}

\end{document}