sphinxlatexshadowbox.sty

%% TOPIC AND CONTENTS BOXES
%
% change this info string if making any custom modification
\ProvidesFile{sphinxlatexshadowbox.sty}[2023/03/19 sphinxShadowBox]

% Provides support for this output mark-up from Sphinx latex writer:
%
% - sphinxShadowBox (environment)
%
% Dependencies (they do not need to be defined at time of loading):
%
% - of course the various colour and dimension options handled via sphinx.sty
% - dimension register \spx@image@maxheight from sphinxlatexgraphics.sty
% - \savenotes/\spewnotes from sphinxpackagefootnote
% - \ifspx@inframed defined in sphinx.sty
%
% Requires:
\RequirePackage{framed}
\RequirePackage{sphinxpackageboxes}

% At 5.1.0 the code formerly here in a definition of \spx@ShadowFBox has been
% refactored to hand over to a more powerful \spx@boxes@fcolorbox provided by
% file sphinxpackageboxes.sty, it can draw rounded corners and add a background
% color.

% At 6.2.0, \spx@ShadowFBox is so much simplified that it is now not
% separately defined but directly incorporated into the \FrameCommand
% definition done by sphinxShadowBox environment below.

% Use framed.sty \MakeFramed/\endMakeFramed to allow page breaks for topic
% boxes.  Originally Sphinx used \shadowbox from fancybox.sty but it did not
% allow pagebreaks (which was problematic for "contents" directive if there
% are many subsections).
%
% Docutils does not allow topic to be nested within topics or other body
% elements.  But the LaTeX code here does allow it:
%
% - a topic inside another topic would be rendered in a minipage (thus not
%   allowing pagebreaks).  Its external frame would adapt perfectly to
%   the *current (smaller) width for text*.
%
% - a topic inside (nested) lists or quote environments would have its frame
%   take the *full width* of the page, but its text contents on the other hand
%   would obey exactly the current indentation plus inner separation.  This is
%   in contrast with the framing used for literal blocks, also based, but in a
%   more sophisticated way on usage of \MakeFramed/\endMakeFramed, and
%   adjusting to current text indentation.
\newenvironment{sphinxShadowBox}
  {%
   \spx@boxes@fcolorbox@setup{topic}%
   % we will use the dimen registers from sphinxpackageboxes.sty which now hold
   % the values from options related to topic/contents
   % MEMO: \spx@boxes@fcolorbox creates an \hbox but does not quit vertical
   %       mode; but in context of framed.sty's \FrameCommand TeX is already
   %       in restricted horizontal mode, so no need for a \leavevmode here.
   \def\FrameCommand {\spx@boxes@fcolorbox}%
   % 6.2.0 adds support for div.topic_box-decoration-break=slice.
   % (it is yet undecided if slice style should inhibit a bottom shadow)
   \ifspx@topic@border@open
     \def\FirstFrameCommand
               {\spx@boxes@fcolorbox@setup@openbottom\FrameCommand}%
     \def\MidFrameCommand
               {\spx@boxes@fcolorbox@setup@openboth  \FrameCommand}%
     \def\LastFrameCommand
               {\spx@boxes@fcolorbox@setup@opentop   \FrameCommand}%
   \fi
   \advance\spx@image@maxheight
   -\dimexpr\spx@boxes@border@top+\spx@boxes@border@bottom
           +\spx@boxes@padding@top+\spx@boxes@padding@bottom
           +\ifdim\spx@boxes@shadow@yoffset<\z@-\fi\spx@boxes@shadow@yoffset
           +\baselineskip\relax
   % configure framed.sty not to add extra vertical spacing
   \ltx@ifundefined{OuterFrameSep}{}{\OuterFrameSep\z@skip}%
   % the \trivlist will add the vertical spacing on top and bottom which is
   % typical of center environment as used in Sphinx <= 1.4.1
   % the \noindent has the effet of an extra blank line on top, to
   % imitate closely the layout from Sphinx <= 1.4.1; the \FrameHeightAdjust
   % will put top part of frame on this baseline.
   \def\FrameHeightAdjust {\baselineskip}%
   % use package footnote to handle footnotes
   \savenotes
   \trivlist\item\noindent
    % use a minipage if we are already inside a framed environment
    \ifspx@inframed\begin{minipage}{\linewidth}\fi
    \MakeFramed {\spx@inframedtrue
    % framed.sty puts into "\width" the added width (padding+border widths)
    % adjust \hsize to what the contents must use
    \advance\hsize-\width
    % adjust LaTeX parameters to behave properly in indented/quoted contexts
    \FrameRestore
    % typeset the contents as in a minipage (Sphinx <= 1.4.1 used a minipage and
    % itemize/enumerate are therein typeset more tightly, we want to keep
    % that). We copy-paste from LaTeX source code but don't do a real minipage.
    \@pboxswfalse
    \let\@listdepth\@mplistdepth \@mplistdepth\z@
    \@minipagerestore
    \@setminipage
    }%
    \color@begingroup % workaround upstream framed.sty bug
    \ifspx@topic@withtextcolor
      \color{sphinxtopicTextColor}%
    \fi
    \spx@topic@TeXextras
  }%
  {% insert the "endminipage" code
    \par\unskip
    \color@endgroup   % matches the \color@begingroup
    \@minipagefalse
   \endMakeFramed
     \ifspx@inframed\end{minipage}\fi
   \endtrivlist
   % output the stored footnotes
   \spewnotes
  }

\endinput