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%D \module
%D [ file=page-fac, % moved from page-ini
%D version=2011.12.07, % 2000.10.20,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Facing Pages,
%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 Page Macros / Facing Pages}
\unprotect
%D \macros
%D {setupoppositeplacing,startopposite}
%D
%D \starttyping
%D \starttext
%D test \startopposite \blackrule[width=3cm,height=4cm] \stopopposite test
%D test \startopposite \blackrule[width=3cm,height=4cm] \stopopposite test
%D \stoptext
%D \stoptyping
\newbox \b_page_facings_content
\newconditional\c_page_facings_busy
\installcorenamespace{oppositeplacing}
\installsetuponlycommandhandler \??oppositeplacing {oppositeplacing}
\unexpanded\def\startopposite
{\dowithnextboxcontent
{\hsize\makeupwidth}%
{\global\setbox\b_page_facings_content\vbox
{\ifvoid\b_page_facings_content
\directoppositeplacingparameter\c!before
\else
\directoppositeplacingparameter\c!inbetween
\unvbox\b_page_facings_content
\fi
\box\nextbox}}%
\vbox\bgroup}
\unexpanded\def\stopopposite
{\egroup}
\def\page_facings_finish
{\ifvoid\b_page_facings_content \else
\global\setbox\b_page_facings_content\vbox to \makeupheight
{\unvbox\b_page_facings_content
\directoppositeplacingparameter\c!after
\vss}%
\fi}
\def\page_facings_flush
{\ifconditional\c_page_facings_busy
\ifvoid\b_page_facings_content \else
\page_facings_flush_indeed
\fi
\fi}
\def\page_facings_flush_indeed
{\ifnum\realpageno>\plusone
\begingroup
\pageornamentstate\plusone % tricky
\page_facings_finish
\page_boxes_shipout{\page_boxes_constructed_page\box\b_page_facings_content}%
\endgroup
\else
\global\setbox\b_page_facings_content\emptybox
\fi}
\appendtoks
\doifelse{\directoppositeplacingparameter\c!state}\v!start\settrue\setfalse\c_page_facings_busy
\to \everysetupoppositeplacing
\setupoppositeplacing
[\c!state=\v!start,
\c!before=,
\c!inbetween=\blank,
\c!after=]
\protect \endinput
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