我如何调整以下代码以在华沙主题中显示三列标题。我想要的是让节、子节和子子节显示在每一列中。目前,以下代码仅显示节和子节。谢谢。
\setbeamertemplate{headline}
{%
\leavevmode%
\@tempdimb=2.4375ex%
\ifnum\beamer@subsectionmax<\beamer@sectionmax%
\multiply\@tempdimb by\beamer@sectionmax%
\else%
\multiply\@tempdimb by\beamer@subsectionmax%
\fi%
\ifdim\@tempdimb>0pt%
\advance\@tempdimb by 1.825ex%
\begin{beamercolorbox}[wd=.25\paperwidth,ht=\@tempdimb]{section in head/foot}%
\vbox to\@tempdimb{\vfil\insertsectionnavigation{.25\paperwidth}\vfil}%
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.75\paperwidth,ht=\@tempdimb]{subsection in head/foot}%
\vbox to\@tempdimb{\vfil\insertsubsectionnavigation{.75\paperwidth}\vfil}%
\end{beamercolorbox}%
\fi%
}