Beamer 目录中的数字、阴影和警报

Question

我觉得我陷入了僵局。我想在 Beamer 中制作具有以下特征的目录：

1. 章节应编号。所有编号应为方格或圆圈（任意），如 [方格] 选项中所示。
2. 我希望目录在每个部分更改时显示（即它必须与 AtBeginSection[] 配合使用）。每当出现新部分时，应在相应部分加下划线，其余部分应加阴影，而不是加下划线。

这是 MWE，目前重点关注幻灯片 2：

\documentclass{beamer}

\setbeamertemplate{section in toc}{\Large{\underline{\inserttocsection}}}
\setbeamertemplate{section in toc shaded}{\inserttocsection}

\begin{document}
\begin{frame}
    Slide 1
\end{frame}

\AtBeginSection[]{
\begin{frame}{Both sections should have circles with section numbers!}
    \tableofcontents[currentsection]
\end{frame}
}

\section{This section should be underlined}
\begin{frame}
    Slide 3
\end{frame}

\section{This section should be shaded and NOT underlined}
\begin{frame}
    Slide 5
\end{frame}
\end{document}

但我似乎无法得到正方形或第二部分的标题阴影。如能得到任何帮助我将不胜感激。

Answer 1

\documentclass{beamer}


\setbeamertemplate{section in toc}{%
    \leavevmode\leftskip=2ex%
  \llap{%
    \usebeamerfont*{section number projected}%
    \usebeamercolor{section number projected}%
    \begin{pgfpicture}{-1ex}{0ex}{1ex}{2ex}
      \color{bg}
      \pgfpathcircle{\pgfpoint{0pt}{.75ex}}{1.2ex}
      \pgfusepath{fill}
      \pgftext[base]{\color{fg}\inserttocsectionnumber}
    \end{pgfpicture}\kern1.25ex%
  }%
  \underline{\inserttocsection}\par%
}

\setbeamertemplate{section in toc shaded}{%
\begin{colormixin}{20!parent.bg}
    \leavevmode\leftskip=2ex%
  \llap{%
    \usebeamerfont*{section number projected}%
    \usebeamercolor{section number projected}%
    \begin{pgfpicture}{-1ex}{0ex}{1ex}{2ex}
      \color{bg}
      \pgfpathcircle{\pgfpoint{0pt}{.75ex}}{1.2ex}
      \pgfusepath{fill}
      \pgftext[base]{\color{fg}\inserttocsectionnumber}
    \end{pgfpicture}\kern1.25ex%
  }%
  \inserttocsection\par%
\end{colormixin}\unskip}

\AtBeginSection[]{
\begin{frame}{Both sections should have circles with section numbers!}
    \tableofcontents[currentsection]
\end{frame}
}

\begin{document}
\begin{frame}
    Slide 1
\end{frame}

\section{This section should be underlined}
\begin{frame}
    Slide 3
\end{frame}

\section{This section should be shaded and NOT underlined}
\begin{frame}
    Slide 5
\end{frame}
\end{document}