sphinxlatexshadowbox.sty

%% TOPIC AND CONTENTS BOXES
%
% change this info string if making any custom modification
\ProvidesFile{sphinxlatexshadowbox.sty}[2022/07/03 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}

\def\spx@shadowbox@boxes@fcolorbox@setup{%
%
  \spx@boxes@border@top   \spx@topic@border@top
  \spx@boxes@border@right \spx@topic@border@right
  \spx@boxes@border@bottom\spx@topic@border@bottom
  \spx@boxes@border@left  \spx@topic@border@left
  \spx@boxes@border       \spxdimen@topic@border
%
  \spx@boxes@padding@top   \spx@topic@padding@top
  \spx@boxes@padding@right \spx@topic@padding@right
  \spx@boxes@padding@bottom\spx@topic@padding@bottom
  \spx@boxes@padding@left  \spx@topic@padding@left
%
  \spx@boxes@radius@topleft     \spx@topic@radius@topleft
  \spx@boxes@radius@topright    \spx@topic@radius@topright
  \spx@boxes@radius@bottomright \spx@topic@radius@bottomright
  \spx@boxes@radius@bottomleft  \spx@topic@radius@bottomleft\relax
%
  \ifspx@topic@withshadow
     \spx@boxes@withshadowtrue
     \spx@boxes@shadow@xoffset \spx@topic@shadow@xoffset
     \spx@boxes@shadow@yoffset \spx@topic@shadow@yoffset\relax
  \else
     \spx@boxes@withshadowfalse
  \fi
  \ifspx@topic@insetshadow\spx@boxes@insetshadowtrue\else
                          \spx@boxes@insetshadowfalse\fi
  \ifspx@topic@withshadowcolor\spx@boxes@withshadowcolortrue\else
                              \spx@boxes@withshadowcolorfalse\fi
  %
  \ifspx@topic@withbackgroundcolor\spx@boxes@withbackgroundcolortrue\else
                                  \spx@boxes@withbackgroundcolorfalse\fi
  \sphinxcolorlet{spx@boxes@backgroundcolor}{sphinxTopicBackgroundColor}%
  %
  \ifspx@topic@withbordercolor\spx@boxes@withbordercolortrue\else
                                  \spx@boxes@withbordercolorfalse\fi
  \sphinxcolorlet{spx@boxes@bordercolor}{sphinxTopicBorderColor}%
  %
  \ifspx@topic@withshadowcolor\spx@boxes@withshadowcolortrue\else
                                  \spx@boxes@withshadowcolorfalse\fi
  \sphinxcolorlet{spx@boxes@shadowcolor}{sphinxTopicShadowColor}%
}%

% At 5.1.0 the code formerly here has been refactored and incorporated
% into more powerful \spx@boxes@fcolorbox from sphinxpackageboxes.sty
\long\def\spx@ShadowFBox#1{%
  \leavevmode
  \setbox\z@\hbox{#1}%
  \ifspx@topic@withshadow
   \ifspx@topic@insetshadow\else
    \ifdim\spx@topic@shadow@xoffset<\z@\hskip\spx@topic@shadow@xoffset\relax
    \fi
   \fi
  \fi
        \if1% use rounded boxes only if needed and possible
          \ifdim\spx@topic@radius@topleft    >\z@0\fi
          \ifdim\spx@topic@radius@topright   >\z@0\fi
          \ifdim\spx@topic@radius@bottomright>\z@0\fi
          \ifdim\spx@topic@radius@bottomleft >\z@0\fi
          1\spx@boxes@fcolorbox{\box\z@}%
        \else
          \spx@ifpackageloaded@pictiie
             {\ifspx@topic@insetshadow
                \spx@boxes@fcolorbox{\box\z@}%
              \else
                \spx@boxes@fcolorbox@rounded{\box\z@}%
              \fi}%
             {\spx@boxes@fcolorbox{\box\z@}}%
        \fi
  \ifspx@topic@withshadow
   \ifspx@topic@insetshadow\else
    \ifdim\spx@topic@shadow@xoffset>\z@\hskip\spx@topic@shadow@xoffset\relax
    \fi
   \fi
  \fi
}

% 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@shadowbox@boxes@fcolorbox@setup
   \def\FrameCommand {\spx@ShadowFBox }%
   \advance\spx@image@maxheight
   -\dimexpr\spx@topic@border@top+\spx@topic@border@bottom
           +\spx@topic@padding@top+\spx@topic@padding@bottom
           +\ifdim\spx@topic@shadow@yoffset<\z@-\fi\spx@topic@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 (=2shadowsep+2shadowrule)
    % 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
  }%
  {% 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