Scaling down tabularray

[pravinbansal-pt]

Is it possible to scale down a tabularray table without scaling down the caption. Currently:

\scalebox{0.5}{
  \begin{longtblr}[
   caption = {A Long Long Long Long Long Long Long Table},
   label = {tblr:test},
  ]{
   colspec = {XXX}, width = 0.85\linewidth,
  }
  \hline
   Head & Head & Head \\
  \hline
   Head & Head & Head \\
  \hline
   Alpha & Beta & Gamma \\
}

Will scale the caption down as well the contents. Just wanting to scale down the contents. Previously possible with standard latex tables as the caption would sit outside of tabular and you could run the scalebox just on tabular.

Thanks!

[muzimuzhi]

An incomplete tricky attempt which only works for longtblr and the default caption template.

• New experimental inner option _scale = <factor> sets a scaling factor.
• When the factor f is not 1, the whole longtblr table box is scaled by f while its caption, which is part of the table box, is scaled by 1/f in addition, to cancel the outer scaling.

\documentclass{article}
\usepackage{tabularray}

\ExplSyntaxOn
\cs_undefine:N \__tblr_halign_whole:Nn
\cs_new_protected:Npn \__tblr_halign_whole:Nn #1 #2
  {
    \noindent
    \fp_compare:nNnF { \l__tblr_scale_fp } = { \c_one_fp }
      { \box_scale:Nnn #1 { \l__tblr_scale_fp } { \l__tblr_scale_fp } }
    \hbox_to_wd:nn { \linewidth }
      {
        \tl_if_eq:nnF {#2} {l} { \hfil }
        \box_use:N #1
        \tl_if_eq:nnF {#2} {r} { \hfil }
      }
  }

\keys_define:nn { tblr }
  {
    % use leading underscore to denote it's not officially supported
    _scale .fp_set:N = \l__tblr_scale_fp
  }

\DefTblrTemplate { caption } { _normal }
  {
    \hbox_set:Nn \l__tblr_caption_box
      {
        \UseTblrTemplate { caption-tag } { default }
        \UseTblrTemplate { caption-sep } { default }
        \UseTblrTemplate { caption-text } { default }
      }
    \dim_compare:nNnTF { \box_wd:N \l__tblr_caption_box } > { \hsize }
      {
        \UseTblrAlign { caption }
        \UseTblrIndent { caption }
        \hbox_set:Nn \l__tblr_caption_left_box
          {
            \UseTblrTemplate { caption-tag } { default }
            \UseTblrTemplate { caption-sep } { default }
          }
        \hangindent = \box_wd:N \l__tblr_caption_left_box
        \hangafter = 1
        \UseTblrHang { caption }
        \leavevmode
        \hbox_unpack:N \l__tblr_caption_box
        \par
      }
      {
        \centering
        \fp_compare:nNnF { \l__tblr_scale_fp } = { \c_one_fp }
          {
            \box_scale:Nnn \l__tblr_caption_box
              { 1/\l__tblr_scale_fp } { 1/\l__tblr_scale_fp }
          }
        \makebox [\hsize] [c] { \box_use:N \l__tblr_caption_box }
        \par
      }
  }
\SetTblrTemplate { caption } { _normal }
\ExplSyntaxOff

\begin{document}
\SetTblrInner[longtblr]{_scale=1}

\begin{longtblr}[
 caption = {A Long Long Long Long Long Long Long Table},
 label = {tblr:test},
]{
 colspec = {XXX}, width = 0.85\linewidth,
}
  \hline
  Head  & Head & Head  \\ \hline
  Head  & Head & Head  \\ \hline
  Alpha & Beta & Gamma
\end{longtblr}

\begin{longtblr}[
  caption = {A Long Long Long Long Long Long Long Table},
  label = {tblr:test},
]{
  colspec = {XXX}, width = 0.85\linewidth,
  _scale=.5
}
  \hline
  Head  & Head & Head  \\ \hline
  Head  & Head & Head  \\ \hline
  Alpha & Beta & Gamma
\end{longtblr}
\end{document}

[muzimuzhi]

Not sure if the contents of contfoot-text (text "Continued on next page") and conthead-text (text "Continued") table elements should be scaled or not.