Footnote text overlays theme elements

[elcorto]

When text in a footnote is long, this happens:

Is there a way to, say, shift the footnote up by the height of the bottom theme elements? Thanks.

[Markus-Goetz]

It is not easy to specify different text width for different lines in the text. Hence I think there are three ways to go about it:

• Raise the footnote position generally to be above the theme elements
• Insert manual line breaks in the footnote
• Limit the width of the footnote generally to end where the theme elements start (e.g. https://tex.stackexchange.com/questions/95983/how-do-i-adjust-the-width-of-beamers-footnote-area)

[elcorto]

It is not easy to specify different text width for different lines in the text. Hence I think there are three ways to go about it:

* Raise the footnote position generally to be above the theme elements

This is what I had in mind. Please see below for details.

* Insert manual line breaks in the footnote

This should have the same effect as the first approach.

* Limit the width of the footnote generally to end where the theme elements start (e.g. https://tex.stackexchange.com/questions/95983/how-do-i-adjust-the-width-of-beamers-footnote-area)

I think this would prevent users from utilizing the full \textwidth.

Re. shifting to the top, I hacked something using a minipage (the \fbox is only for debugging).

% \myfootnote{foo}
% \myfootnote[2cm]{... long text here ...}
\newcommand{\myfootnote}[2][0.4cm]{\tiny
    \footnote{
        \fbox{
            \begin{minipage}[][][t]{0.9\textwidth}
                #2\\
                \vspace{#1}
            \end{minipage}
        }
    }
}

The default vspace of 0.4cm works well for one line text but there seems to be a max. footnote height when using long text

in which case one has to increase the vspace using e.g. \myfootnote[2cm]{...} to force the layout engine to shift things up

which is a hack. In both cases, the minipage is outside of the page already. There must be a better solution, i.e. a default length setting such as a min distance between page bottom and footnote.

[elcorto]

The above doesn't work since the minipage will cause beamer to create new slides if shifted down.
While I still don't know what (latex/beamer/theme) default length to set, which would solve all this, I needed a solution for both \footnote and biblatex's \fullfootcite(). So leaving my current hack here in case anyone needs it.

% This solves the following problem: biblatex's \fullcite() is great.
% \fullfootcite() places the rendered bib entries in a footnote which is what
% we want. BUT it creates a text entry [1], [2] etc which we can't turn off.
% Using \footnote{\fullcite{}} does the same.
%
% https://tex.stackexchange.com/a/488624
\makeatletter
\def\@makefnmark{}
\makeatletter

% shift footnotes up by this much to be above the theme footer. What is the
% default LaTeX length to change here instead???
\newlength{\footenotesep}
\setlength{\footenotesep}{.3cm}

% \footnotesize is too big
\setbeamerfont{footnote}{size=\scriptsize}

% single footnote line
%   \myfootnote{...}
%
% multi line
%   \myfootnote[0pt]{1st line}
%   \myfootnote[0pt]{2nd line}
%   ...
%   \myfootnote{last line}
\newcommand{\myfootnote}[2][\footenotesep]{
    \footnote{
        \hspace{-0.5cm}
        #2\\
        \vspace{#1}
    }
}

% one line and multi line: same as \myfootnote
\newcommand{\myfootfullcite}[2][\footenotesep]{
    \footnote{
        \hspace{-0.5cm}
        \fullcite{#2}\\
        \vspace{#1}
    }
}