[Tex/LaTex] Adjusting vertical spacing in subfloatrow captions (subcaption+floatrow)

captionsfloatrowfloatssubcaptionsubfloats

I am trying to adjust sub-captions for sub-figures in a figure which includes multiple \subfloatrows and an additional \ffigbox outside the rows.

How can I modify the vertical spacing between sub-figure and sub-caption and between sub-caption and any sub-figure below it? I would like the sub-caption to be closer to its sub-figure and a little further from any sub-figure below it.

sub-figures in rows with sub-captions

Code:

\documentclass{article}
\usepackage{graphicx}
\usepackage{subcaption}
\usepackage[valign=c,heightadjust=all]{floatrow}
\begin{document}
\begin{figure}
  \centering
  \captionsetup[subfloatrow]{font+={footnotesize}}%
  \floatbox{figure}{%
    \begin{subfloatrow}[2]
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
    \end{subfloatrow}

    \begin{subfloatrow}[3]
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
    \end{subfloatrow}

    \begin{subfloatrow}[3]
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
    \end{subfloatrow}

    \begin{subfloatrow}[2]
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
    \end{subfloatrow}

    \ffigbox{%
      \includegraphics[height=8em]{example-image-a}}{\subcaption*{Sub-Caption}}
  }{%
    \caption{Caption}\label{fig:label}%
  }
\end{figure}
\end{document}

Guntram's question is similar, but it has not be answered in over 2 years. The suggestion in comments is to abandon use of floatrow. However, this is supposed, I think, to work with the caption/subcaption packages. At least, so the documentation says.

However, I don't find floatrow's documentation at all easy and I cannot really figure out how caption–subcaption–floatrow are intended to play nicely together.

Best Answer

Controlling vertical spacing between rows is well hidden in the documentation: you have to declare a key via\DeclareFloatVCode, and ask to apply it with\floatsetup{rowpostcode= …}. Font size can be changed via \captionsetup[subfigure], ang the vertical skip between figure and caption is settled with \floatsetup{captionskip= …}.

Here is a (hideous) example:

\documentclass{article}
\usepackage[showframe, margin=25mm]{geometry}
\usepackage{graphicx}
\usepackage{subcaption}
\usepackage[,heightadjust=all]{floatrow}

\DeclareFloatVCode{largevskip}%
{\vskip 20pt}
\floatsetup{captionskip=0pt,rowpostcode =largevskip, valign=c }%
\captionsetup[subfigure]{font =Large}

\begin{document}
\begin{figure}
  \centering-%
  \floatbox{figure}{%
    \begin{subfloatrow}[2]
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
    \end{subfloatrow}

    \begin{subfloatrow}[3]
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
    \end{subfloatrow}

    \begin{subfloatrow}[3]
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
    \end{subfloatrow}

    \begin{subfloatrow}[2]
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
      \ffigbox[\FBwidth]{%
        \includegraphics[height=8em]{example-image-a}}{\caption*{Sub-Caption}}
    \end{subfloatrow}

    \ffigbox{%
      \includegraphics[height=8em]{example-image-a}}{\subcaption*{Sub-Caption}}
  }{%
    \caption{Caption}\label{fig:label}%
  }
\end{figure}
\end{document}

enter image description here

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