Beamer infolines themes, like CambridgeUS, insert the titles of the current section and subsection in the headline. These titles appear to be clickable (the screen pointer changes as if they were so) but nothing happens when one clicks them.
Is there a way to link the headline titles to the first frame of the corresponding section or subsection? Something like this already works on the theme footline: clicking on the presentation title takes you to the title page.
Edit: MWE
\documentclass{beamer}
\usetheme{CambridgeUS}
\setbeamertemplate{navigation symbols}{}
\title{Click on Headline}
\author{A.~U.~Thor}
\institute{X-University}
\date{2015}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\begin{frame}[t]{Contents}
\tableofcontents[subsectionstyle=hide]
\end{frame}
\section{Section 1}
\begin{frame}{Section 1}
\centering \Large Section 1
\end{frame}
\begin{frame}[t]{Section 1: Contents}
\tableofcontents[currentsection,hideothersubsections]
\end{frame}
\subsection{Subsection 1.1}
\begin{frame}{Frame 1.1.1}
A frame of subsection 1.1
\end{frame}
\begin{frame}{Frame 1.1.2}
Another frame of subsection 1.1
\end{frame}
\subsection{Subsection 1.2}
\begin{frame}{Frame 1.2.1}
A frame of subsection 1.2
\end{frame}
\begin{frame}{Frame 1.2.2}
Another of subsection 1.2
\end{frame}
\section{Section 2}
\begin{frame}{Section 2}
\centering \Large Section 2
\end{frame}
\begin{frame}[t]{Section 2: Contents}
\tableofcontents[currentsection,hideothersubsections]
\end{frame}
\subsection{Subsection 2.1}
\begin{frame}{Frame 2.1.1}
A frame of subsection 2.1
\end{frame}
\end{document}
beamerbasenavigation.sty
andbeamerbasesection.sty
to see if i can redefine something like they did here. i'm certainly not great with this though, so if somebody with more experience is willing to pick this up, it'll go faster...