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%D \module
%D [ file=pack-mis, % moved from e.g. core-mis
%D version=1998.01.29,
%D title=\CONTEXT\ Core Macros,
%D subtitle=Miscelaneous,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Packing Macros / Misc Commands}
\unprotect
% a quite old mechanism already (but inheritance added)
%
% \defineplacement[name][settings]
% \setupplacement [name][settings]
% \placement [name][settings]
% \place<name> [settings]
\installcommandhandler \??pl {placement} \??pl
\appendtoks
\setuevalue{\e!place\currentplacement}{\pack_placement{\currentplacement}}%
\to \everydefineplacement
\setupplacement
[\c!left=\hss,
\c!right=\hss,
\c!linecorrection=\v!off,
\c!depthcorrection=\v!off,
\c!grid=\v!middle,
%\c!before=,
%\c!after=,
\c!margin=\v!standard]
\unexpanded\def\placement[#tag]%
{\pack_placement{#tag}}
\unexpanded\def\pack_placement#tag%
{\bgroup
\edef\currentplacement{#tag}%
\dosingleempty\pack_placement_indeed}
\def\pack_placement_indeed[#settings]% set test can be sped up but non critical
{\iffirstargument
\setupcurrentplacement[#settings]%
\fi
\dowithnextboxcontent{\forgetall}{\pack_placement_flush\egroup}\vbox}
\def\pack_placement_flush
{\setlocalhsize
\placementparameter\c!before
\begingroup
\disableparpositions
\setbox\nextbox\hbox to \localhsize
{\placementparameter\c!left
\flushnextbox
\placementparameter\c!right}%
\ifinsidefloat \else
\addlocalbackgroundtobox\nextbox
\fi
\ifgridsnapping
\doifinset{\placementparameter\c!margin}{\v!standard,\v!yes}\noindent % unchecked
\doifelsenothing{\placementparameter\c!grid}
{\snaptogrid[\v!middle]}
{\snaptogrid[\placementparameter\c!grid]}%
\hbox{\flushnextbox}%
\else
\doif{\placementparameter\c!linecorrection}\v!on \startbaselinecorrection
\doifinset{\placementparameter\c!margin}{\v!standard,\v!yes}\noindent
\flushnextbox
\doif{\placementparameter\c!depthcorrection}\v!on\baselinecorrection
\doif{\placementparameter\c!linecorrection }\v!on\stopbaselinecorrection
\fi
\endgroup
\placementparameter\c!after}
\protect \endinput
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