[Tex/LaTex] Boxes placement in tcolorbox

Question

I'd like to know if there is a way to place tcolorboxes like this:

-------- --------
| box1 | |      |
-------- | box3 |  
-------- |      | 
| box2 | |      |
-------- --------

To do that I'm actually placing the boxes inside tikz nodes, but that seems like an overkill solution. Is there a tikz-free approach?

Answer 1

Obviously, you would use the \tcbox macro version for your boxes, rather than the environment form. Calculation of the stackgap is shown automated in this MWE. (Note: this example works starting with V2.30 of tcolorbox).

\documentclass{article}
\usepackage{stackengine}
\usepackage{tcolorbox}
\begin{document}

\def\boxone{\tcbox[nobeforeafter]{This is a test}}
\def\boxtwo{\tcbox[nobeforeafter]{Another test}}
\def\boxthree{\tcbox[nobeforeafter,minipage,width=0.7in]{this is a very long box}}

\stackon[\heightof{\boxthree}-\heightof{\boxone}-\heightof{\boxtwo}]%
  {\boxtwo}{\boxone}~\boxthree

\end{document}