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I'd like to parse an optional variable from a custom \newenvironment{example} to an mdframed environment \mytextbox nested in the example environment.

What I'd like to achieve is something like

Example 1.1 [Optional example title]

and the rest of the text in the framed box.

So far, I have the desired mdframed formatting I'd like, (spacing, "Example X.X", etc.) but I cant figure out how to put in the optional title correctly. It's being printed into the mdframed test area instead of the title area.

This is possibly a simple oversight and I'm being stupid with the limited knowledge I have on macros and environments, it's my first time using them, which is why I'm here :)

Below is a MWE and a sample output.

\documentclass[12pt,oneside]{report} \usepackage[a4paper,width=170mm,top=25mm,bottom=25mm]{geometry} \usepackage{lipsum} \usepackage{tikz} \usepackage{mdframed} \newcounter{exampleCounter}[section] \newmdenv[ linewidth=1pt,% frametitlerule=true,% backgroundcolor=black!3,% innerleftmargin=10mm,% innerrightmargin=10mm,% innerbottommargin=10mm,% ] {mytextbox} \newenvironment{example} [1][] {\refstepcounter{exampleCounter} \begin{mytextbox}[frametitle={Example~\thechapter.\theexampleCounter.~##1}] } {\end{mytextbox}} \usepackage{setspace} \setlength{\parindent}{0mm} \setlength{\parskip}{1em} \begin{document} \chapter{First Chapter} \lipsum[1] \begin{example}{\textit{Optional example title}} \lipsum[2] \end{example} \lipsum[3] \end{document}

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I changed ##1 to #1. Also, in the invocation, one needs to use square brackets for optional arguments: \begin{example}[\textit{Optional example title}].

\documentclass[12pt,oneside]{report} \usepackage[a4paper,width=170mm,top=25mm,bottom=25mm]{geometry} \usepackage{lipsum} \usepackage{tikz} \usepackage{mdframed} \newcounter{exampleCounter}[section] \newmdenv[ linewidth=1pt,% frametitlerule=true,% backgroundcolor=black!3,% innerleftmargin=10mm,% innerrightmargin=10mm,% innerbottommargin=10mm,% ] {mytextbox} \newenvironment{example}[1][] {\refstepcounter{exampleCounter} \begin{mytextbox}[frametitle={Example~\thechapter.\theexampleCounter.~#1}] } {\end{mytextbox}} \usepackage{setspace} \setlength{\parindent}{0mm} \setlength{\parskip}{1em} \begin{document} \chapter{First Chapter} \lipsum[1] \begin{example}[\textit{Optional example title}] \lipsum[2] \end{example} \lipsum[3] \end{document}

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  • Yeah, as I suspected... I was dumb. But I discovered a lot while trying to search for alternative solutions. I would highly recommend the exsheets package for question-solution type layouts for tutorials, exercises and exams. I ended up embedding a custom NewQuSolPair from exsheets with a NewDocumentEnvironment offered by the xpatch package. This worked exceptionally well, though the only drawback is I don't have a line under the "Example" heading. But I can live with that. Thanks for the reply though, I really appreciate it. Commented May 18, 2021 at 19:26
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    @JeanJordaan I'm glad you found an appropriate approach and learned new things along the way. Carry on bravely! Commented May 18, 2021 at 19:34

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