Interfering with org beamer outline export

Question

I have the following org file:

#+TITLE: Some title
#+OPTIONS: H:2
#+latex_class: beamer


* Section 1
** Frame 1

* Section 2
** Frame 2

After org-exporting I obtain the .tex, which includes

% beginning of the document
\begin{document}

\maketitle
\begin{frame}{Outline}
\tableofcontents
\end{frame}
% rest of the document  ...

However, I want to apply some user-defined latex commands before and after outline frame to get something like:

% beginning of the document
\begin{document}

\maketitle
\AddBackButton
\begin{frame}{Outline}
\tableofcontents
\end{frame}
\AddTableOfContentsButton
% rest of the document  ...

Keep in mind that user-defined commands should be applied only for an outline frame and not for others. How should I modify beamer exporting process to get above content in tex file?

PS. FYI, I want to add a button for each presentation frame that links to an outline frame (this is the job of \AddTableOfContentsButton command), and a button on an outline that allows user go back to the last frame he visited (this part is handled by \AddBackButton):

\newcommand\AddTableOfContentsButton{%
\setbeamertemplate{background canvas}{%
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=west] at ([yshift=5pt,xshift=\paperwidth/2-\shift]current page.south west)
  {\hyperlink{toc}{
  \setbeamercolor{button}{fg=white,bg=lightgray}%
  \beamerbutton{T} %\beamergotobutton{T}
  }};
\end{tikzpicture}%
  }%
}


\newcommand\AddBackButton{%
\setbeamertemplate{background canvas}{%
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=west] at ([yshift=5pt,xshift=\paperwidth/2-\shift]current page.south west)
  {
  \setbeamercolor{button}{fg=white,bg=lightgray}
  \beamerbutton{\Acrobatmenu{GoBack}{B}}
  };
\end{tikzpicture}%
  }%

Answer 1

You can use the same trick as in https://topanswers.xyz/tex?q=1004 to automatically change the background template for your toc frame.

However are you sure you need to add a back button yourself? Beamer automatically includes them in the the navigation symbols (one could also add an icon to jump to the toc). They are placed in front of the content, so won't be obscured by large images or similar. Here the relevant excerpt from the beamer user guide:

Also many pdf viewers have a keyboard shortcut to go back to the previously viewed page, consider consulting the user manual of your viewer.

\documentclass{beamer}

\usepackage{tikz}

\setbeamertemplate{background canvas}{%
  \begin{tikzpicture}[remember picture,overlay]
    \node[anchor=west] at ([yshift=5pt,xshift=\paperwidth/2]current page.south west) {
      \hyperlink{toc}{
        \setbeamercolor{button}{fg=white,bg=lightgray}%
        \beamerbutton{T} %\beamergotobutton{T}
      }
    };
  \end{tikzpicture}%
}%


\makeatletter
\pretocmd{\tableofcontents}{\thispagestyle{navigation@toc}\label{toc}}{}{}
\addtobeamertemplate{title page}{\thispagestyle{navigation@title}}{}

\def\ps@navigation@title{%
  \setbeamertemplate{background canvas}{}
}

\def\ps@navigation@toc{%
  \setbeamertemplate{background canvas}{%
    \begin{tikzpicture}[remember picture,overlay]
      \node[anchor=west] at ([yshift=5pt,xshift=\paperwidth/2]current page.south west) {
      \setbeamercolor{button}{fg=white,bg=lightgray}
      \beamerbutton{\Acrobatmenu{GoBack}{B}}
      };
    \end{tikzpicture}%
  }
}
\makeatother





\begin{document}

\maketitle

\begin{frame}{Outline}
\tableofcontents
\end{frame}

\section{section}
\begin{frame}
content...
\end{frame}

\end{document}

Answer 2

@samcarter_is_at_topanswers.xyz

Sorry, I'm writing here but it's too long to put it as a comment...

1. I like my navigation buttons because they are located at the same position on each slide, so you don't need to move the cursor on slide to go back-and-forth, you just click.

2. The solution you provided works almost fine except the fact that it adds toc button to the titlepage and this is not what I want.

   I tried to circumvent it by mimicking your piece of code for the titlepage like this:

   \makeatletter
   \pretocmd{\maketitle}{\thispagestyle{navigation@titlepage}\label{toc}}{}{}
   
   \def\ps@navigation@titlepage{%
     \setbeamertemplate{background canvas}{%
      \begin{tikzpicture}[remember picture,overlay]
        \node[anchor=west] at ([yshift=5pt,xshift=\paperwidth/2]current page.south west) {
          \setbeamercolor{button}{fg=white,bg=lightgray}
   
     };
      \end{tikzpicture}%
     }
   }
   \makeatother
   

   but this, in turn, devastates the titlepage. Can I set background canvas just for the titlepage in the same manner as for toc page?

3. Anyway, the line with pretocmd in your code inspired me to invent one more approach. I added: #+beamer_header:\apptocmd{\maketitle}{\AddBackButton}{}{} to the preamble, and

   #+begin_export beamer
   \AddTableOfContentsButton
   #+end_export
   

   somewhere below the first section and before the first frame (between the first node with * and the first node with ** in an org-file). It's not very elegant solution I guess, but it works at least.