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This question is related to my other one. In that question, I describe my attempt to replace tcolorbox with another frame drawing technique, which does not introduce problems described below, but creates new ones (though maybe easier to solve for advanced TeX users).

Question

When tcolorbox needs to be broken, the vertical glue of its inner content does not stretch, resulting in an uneven page layout. How to fix that? I have tried multiple options and failed.

Code

\documentclass{report}
\usepackage[utf8]{inputenc}
\usepackage[many]{tcolorbox}
\usepackage{tikz}
\flushbottom
\newcommand{\object}{\par\tikz[]{\draw (0,0) rectangle (\textwidth,3); \node at (\textwidth/2,1.5) {Content}}}

\tcbset{my-frame/.style={
    breakable,
    before skip=\medskipamount,
    after skip=\medskipamount
}}


\begin{document}
\begin{tcolorbox}[my-frame]
    \object
    \medskip % not stretched
    \object
\end{tcolorbox}
 % stretched too much
\begin{tcolorbox}[my-frame]
    \object
    \medskip % not stretched
    \object
    \medskip % not stretched
    \object
    \medskip % not stretched
    \object
    \medskip % not stretched
    \object
\end{tcolorbox}
\end{document}

Illustration

In the picture below, vspace between boxes is stretched, while the vspace inside them is not: vspace between boxes is stretched, while the vspace inside them is not.

Expected result

The vspaces should be evenly adjusted: Evenly adjusted spaces

I think that what I'm asking about is impossible to do with tcolorbox, because it uses something minipage-like underneath. I'd be happy to hear about other box drawing methods which would not introduce such problems. I don't need any fancy features, I just want to be able to draw a colourful background under some paragraphs, like theorems and proofs, which span many pages.

Radek
  • 163

0 Answers0