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The \crefrange command from the cleveref package transforms simultaneous cross-references to objects 1a, 1b and 1c as a range 1a–1c, and can be tuned further with \crefstripprefix to remove the common prefix (here, 1, yielding 1a–c).

I use subfloats references in the format 1(a), 1(b), 1(c), and using the above feature yields 1(a)–c); note the opening parenthesis before the c has been stripped because it is in common with the first label.

Is there a workaround to get 1(a)–(c)? I guess the best would be a modification of \crefstripprefix, so that it does not strip opening delimiters; my knowledge of TeX is too poor to write it myself. As a side discussion, would anyone see a drawback in making this the default behavior?

\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{floatrow}
\usepackage{subcaption}

% define subfigure label 
\captionsetup[subfloat]{labelformat=simple}
\renewcommand\thesubfigure{(\alph{subfigure})}

\usepackage{cleveref}
\crefrangelabelformat{figure}{#3#1#4--#5\crefstripprefix{#1}{#2}#6}

\begin{document}

\begin{figure}
\ffigbox[\textwidth]{
\begin{subfloatrow}[3]
\ffigbox[\FBwidth]{\includegraphics[height=2cm,width=2cm]{}}{\caption{subcap}\label{sfig:a}}
\ffigbox[\FBwidth]{\includegraphics[height=2cm,width=2cm]{}}{\caption{subcap}\label{sfig:b}}
\ffigbox[\FBwidth]{\includegraphics[height=2cm,width=2cm]{}}{\caption{subcap}\label{sfig:c}}
\end{subfloatrow}
}{\caption{cap}\label{fig:1}}
\end{figure} 
%
\begin{figure}[h]
\includegraphics[height=2cm,width=2cm]{}
\caption{cap}\label{fig:2}
\end{figure}
%
\begin{figure}[h]
\includegraphics[height=2cm,width=2cm]{}
\caption{cap}\label{fig:3}
\end{figure}

\crefrange{fig:1}{fig:3}

\crefrange{sfig:a}{sfig:c}
\end{document}
Hugo Raguet
  • 308
  • Please provide an MWE (minimum working example) that generates the issue you would like to fix. It's potentially important to know which document class you employ, which packages you load, and how the subfloats are created and \labeled. – Mico Feb 20 '18 at 15:15
  • @Mico: I added a MWE; thanks for looking into it. I use floatrow and subcaption, but I guess any subfigure mechanism creating labels like \arabic{\thefigure}(\alph{\thesubfigure}) would behave the same here. – Hugo Raguet Feb 20 '18 at 15:53

1 Answers1

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After playing around, it seems that, at least with the floatrow/subcaption mechanism of my MWE, labels for subfigures are actually of type subfigure. This suggests to treat differently label format for figure and subfigure. However, just adding

\crefrangelabelformat{subfigure}{%
    #3#1#4--#5(\crefstripprefix{#1}{#2}#6
} % note the additional opening parenthesis after #5

is not sufficient: the labels of my subfigure references still behave like the labels of the figure references. For some reason, adding also

\crefname{subfigure}{figure}{figures}

finally makes the subfigures have a label format of their own (does this somehow “officialize” the subfigure reference type? no idea what happens).

Although this achieves what I was looking for, it still feels that patching \crefstripprefix so that it does not strip opening delimiters would be a more satisfying solution.

Hugo Raguet
  • 308
  • 'subfigure' is a separate reference type from 'figure', but it defaults to taking its format from 'figure' (even when you customise the 'figure' format). Customising the 'subfigure' format means it no longer tracks the 'figure' format. 'subequation' and 'sub[sub]section' work similarly, and maybe a few others I've forgotten. – Toby Cubitt Feb 24 '18 at 10:01
  • Shouldn't need the dummy '\crefname' though - customising '\creflabelformat' should be enough. Sounds like a bug. I'll look into it. – Toby Cubitt Feb 24 '18 at 10:20
  • @TobyCubitt: thank you. By the way, let me say that cleveref package is great. I wish I was good enough in TeX internal programing for a couple of customizations, like the above, or making the \crefstripprefix trick available to multiformat \cref. – Hugo Raguet Feb 24 '18 at 12:25