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%D \module
%D [ file=page-flw,
%D version=2003.04.19, % from test-002 (1997) profile experiment
%D title=\CONTEXT\ Page Macros,
%D subtitle=Text Flows,
%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 / Text Flows}
%D This is high experimental and especially flushing may change (proper spacing is
%D the driving force here). It's an old mechanism used for playing with stepping
%D through document threads. As it's a simple and effective mechanism we keep it
%D around. It's not to be confused with upcoming stream support.
%D
%D \starttyping
%D \setuppapersize [S6]
%D \setuptolerance [verytolerant,stretch]
%D \setupfooter [strut=no]
%D \setupwhitespace[big]
%D
%D \setuplayout
%D [rightedge=5cm,width=fit,margin=0pt,edgedistance=1cm,
%D footer=4cm,footerdistance=1cm,header=0cm]
%D
%D \setuptexttexts [edge][][\vbox{\flushtextflow{alpha}}]
%D \setupfootertexts[edge][][\vbox{\flushtextflow{beta}}]
%D \setupfootertexts [\vbox{\flushtextflow{gamma}}][]
%D
%D \definetextflow [alfa] [width=\rightedgewidth]
%D \definetextflow [beta] [width=\rightedgewidth]
%D \definetextflow [gamma] [width=\footerheight]
%D
%D \starttext
%D
%D \dorecurse{50}
%D {\getrandomnumber{\funny}{0}{8}
%D \ifcase\funny \starttextflow[alfa] \input tufte.tex \stoptextflow
%D \or \starttextflow[beta] \input knuth.tex \stoptextflow
%D \or \starttextflow[gamma] \input materie.tex \stoptextflow
%D \or {\bf TUFTE}\quad \input tufte \par
%D \or {\bf TUFTE}\quad \input tufte \par
%D \or {\bf KNUTH}\quad \input knuth \par
%D \or {\bf KNUTH}\quad \input knuth \par
%D \or {\bf MATERIE}\quad \input materie \par
%D \else {\bf MATERIE}\quad \input materie \par
%D \fi}
%D
%D \stoptext
%D \stoptyping
\unprotect
\installcorenamespace{textflow}
\installcorenamespace{textflowbox}
\installcommandhandler \??textflow {textflow} \??textflow
\setuptextflow
[%c!style=,
%c!color=,
\c!width=\availablehsize]
\appendtoks
\ifcsname\??textflowbox\currenttextflow\endcsname
\setbox\csname\??textflowbox\currenttextflow\endcsname\emptybox
\else
\expandafter\newbox\csname\??textflowbox\currenttextflow\endcsname
\fi
\to \everydefinetextflow
\newinteger\b_page_textflow_box
\permanent\def\textflowcollector#1%
{\begincsname\??textflowbox#1\endcsname}
\permanent\protected\def\doifelsetextflowcollector#1%
{\ifcsname\??textflowbox#1\endcsname
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\permanent\protected\def\doifelsetextflow#1%
{\unless\ifcsname\??textflowbox#1\endcsname
\expandafter\secondoftwoarguments
\orelse\ifvoid\csname\??textflowbox#1\endcsname
\expandafter\secondoftwoarguments
\else
\expandafter\firstoftwoarguments
\fi}
\aliased\let\doiftextflowcollectorelse\doifelsetextflowcollector
\aliased\let\doiftextflowelse \doifelsetextflow
\permanent\protected\def\starttextflow[#1]%
{\begingroup
\edef\currenttextflow{#1}%
\ifcsname\??textflowbox\currenttextflow\endcsname
\b_page_textflow_box\csname\??textflowbox\currenttextflow\endcsname
\global\setbox\b_page_textflow_box\vbox
\bgroup
\dontcomplain
\ifvoid\b_page_textflow_box\else
\unvbox\b_page_textflow_box
\fi
\hsize\textflowparameter\c!width\relax
\usetextflowstyleandcolor\c!style\c!color
\enforced\permanent\protected\def\stoptextflow{\endgraf\egroup\endgroup}%
\else
\enforced\aliased\let\stoptextflow\endgroup
\fi}
\aliased\let\stoptextflow\relax
\permanent\protected\def\flushtextflow#1%
{\begingroup
\edef\currenttextflow{#1}%
\ifcsname\??textflowbox\currenttextflow\endcsname
\b_page_textflow_box\csname\??textflowbox\currenttextflow\endcsname
\ifvoid\b_page_textflow_box
% sorry
\orelse\ifdim\ht\b_page_textflow_box>\vsize
\setbox\scratchbox\vsplit\b_page_textflow_box to \vsize
\ifvoid\scratchbox\else
\unvbox\scratchbox
\fi
\else
\unvbox\b_page_textflow_box
\fi
\fi
\endgroup}
\protect \endinput
% \setuppapersize [A6]
% \setupbodyfont [pagella, 12pt]
%
% \definetextflow [even] [width=\textwidth]
% \definetextflow [odd] [width=\textwidth]
%
% \starttextflow [even] \dorecurse{15}{\input bryson} \stoptextflow
% \starttextflow [odd] \dorecurse {5}{\input knuth } \stoptextflow
%
% \starttext
%
% \doloop {
% \ifodd\realpageno
% \doiftextflowelse{odd} {
% \bgroup
% \vsize\dimexpr\textheight-\strutdp\relax
% \flushtextflow{odd}
% \egroup
% } {
% \null
% }
% \page
% \else
% \doiftextflowelse{even} {
% \bgroup
% \vsize\dimexpr\textheight-\strutdp\relax
% \flushtextflow{even}
% \egroup
% } {
% \null
% }
% \page
% \fi
% \doiftextflowelse{even}\donothing{\doiftextflowelse{odd}\donothing\exitloop}
% }
%
% \stoptext
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