Why tikzmark doesn't work with beamer class?
beamer redefines \pgfmark
and adds a number for the slide to the internal name to make if overlay aware. If you look at the aux you can see that you get names like line-code-6-start-1
instead of line-code-6-start
. This means that all your \iftikzmark
fails.
\documentclass{beamer}
%\documentclass{article}\usepackage{beamerarticle}
%
\usepackage{listings}
\usepackage{tikz}
\usetikzlibrary{tikzmark,fit,calc}
\usetikzmarklibrary{listings}
\lstset{basicstyle=\ttfamily}
\tikzset{
balloon/.style={
draw,
fill=blue!20,
opacity=0.4,
inner sep=4pt,
rounded corners=2pt
},
}
\makeatletter
%
\newcommand{\balloon}[4]{%
\pgfmathtruncatemacro\firstline{%
#3-1%
}%
\iftikzmark{line-#2-\firstline-start-\the \beamer@slideinframe}{%
\iftikzmark{line-#2-#3-first-\the \beamer@slideinframe}{%
\xdef\blines{($ ({pic cs:line-#2-\firstline-start} -| {pic
cs:line-#2-#3-first})!.5!({pic cs:line-#2-#3-first}) $)}%
}{%
\iftikzmark{line-#2-#3-start-\the \beamer@slideinframe}{%
\xdef\blines{({pic cs:line-#2-\firstline-start} -| {pic
cs:line-#2-#3-start})}%
}{%
\xdef\blines{(pic cs:line-#2-\firstline-start)}%
}%
}%
}{%
\xdef\blines{}%
}%
\foreach \k in {#3,...,#4} {%
\iftikzmark{line-#2-\k-first-\the \beamer@slideinframe}{%
\xdef\blines{\blines (pic cs:line-#2-\k-first) }%
}{} \iftikzmark{line-#2-\k-end-\the \beamer@slideinframe}{%
\xdef\blines{\blines (pic cs:line-#2-\k-end) }%
}{}%
}%
\ifx\blines\empty
\else
\edef\temp{\noexpand\tikz[remember picture,overlay]
\noexpand\node[fit={\blines},balloon] (#1) {};}%
\temp
\fi
}
%
\begin{document}
\begin{frame}[fragile]
\balloon{comment}{code}{3}{4}
\begin{lstlisting}[name=code]
Foo Bar Baz
Foo Baz Bar
Bar Foo Baz
Bar Baz Foo
Baz Foo Bar
Baz Bar Foo
\end{lstlisting}
\end{frame}
\end{document}
Addition
An alternative to the redefinition of \ballon
is a redefinition of \iftikzmark
:
\makeatletter
\renewcommand\iftikzmark[3]{%
\@ifundefined{save@pt@#1-\the\beamer@slideinframe}{%
#3%
}{%
#2%
}%
}%