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%D \module
%D [ file=page-spr,
%D version=2002.11.11,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Spreading,
%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 / Spreading}
% This module is experimental and not yet official!
\unprotect
\newbox \b_page_spread_content
\newconditional\c_page_spread_busy
\newconditional\c_page_spread_once % when true only one flush (writes etc)
% beware, ugly overload, to be redone
\def\normalsettextpagecontent#1#2#3% #2 and #3 will disappear
{\setbox#1\hbox
{\setlayoutcomponentattribute{\v!page:\v!text}%
\vbox \layoutcomponentboxattribute to \textheight
{\offinterlineskip
\freezetextwidth
\hsize\textwidth % local variant of \sethsize
\boxmaxdepth\maxdepth
\noindent % content can be < \hsize
\page_otr_command_package_contents#2#3}}%
\dp#1\zeropoint
\ifconditional\c_page_spread_busy
\normalsettextpagecontent_spread{#1}%
\else
\normalsettextpagecontent_normal{#1}%
\fi}
\def\normalsettextpagecontent_normal#1%
{\setbox#1\hbox to \makeupwidth
{\hss\box#1\hss}} % never change the \hss's
\def\normalsettextpagecontent_spread#1%
{\setbox#1\hbox to \makeupwidth
{\ifvoid\b_page_spread_content
\ifconditional\c_page_spread_once
\box#1%
\else
\global\setbox\b_page_spread_content\box#1%
\copy\b_page_spread_content
\fi
\hss % left page
\else
\hss % right page
\ifarrangingpages
% writes don't matter anyway
\else\ifconditional\c_page_spread_once
\global\setbox\b_page_spread_content\emptyhbox
\wd\b_page_spread_content\makeupwidth
\ht\b_page_spread_content\textheight
\else
% writes can interfere (todo: write stripper, but how about hyperlinks)
\fi \fi
\box\b_page_spread_content
\fi}}
\unexpanded\def\page_spread_flush
{\ifconditional\c_page_spread_busy \ifvoid\b_page_spread_content\else
% this page will be discarded later
\emptyhbox \page
\fi \fi }
\unexpanded\def\startspread
{\ifdoublesided
\ifconditional\c_page_spread_busy
\doubleexpandafter\page_spread_start_nop
\else
\doubleexpandafter\page_spread_start_yes
\fi
\else
\expandafter\page_spread_start_nop
\fi}
\let\stopspread\relax
\unexpanded\def\page_spread_start_yes
{\bgroup
\page[\v!left]%
%\setsystemmode{spread}%
\settrue\c_page_spread_busy
\expanded{\setuplayout[\c!textwidth=\the\dimexpr2\textwidth+2\backspace\relax]}%
\let\stopspread\page_spread_stop_yes}
\unexpanded\def\page_spread_stop_yes
{\kern\zeropoint
\page
\setuplayout[\c!textwidth=\textwidth]
\page[\v!left]
\egroup}
\unexpanded\def\page_spread_start_nop
{\bgroup
\let\stopspread\page_spread_stop_nop}
\unexpanded\def\page_spread_stop_nop
{\egroup}
\protect \endinput
% texexec --arr --pdf test
%
% \setuplayout[width=middle]
% \setuppapersize[A4][A3,landscape]
% \setuppagenumbering[alternative=doublesided]
% \setuparranging[2UP]
%
% \starttext
%
% \dorecurse{3}{\input tufte }
%
% \startspread
% \dorecurse{10}{\input tufte }
% \stopspread
%
% \dorecurse{3}{\input tufte }
%
% \stoptext
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