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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
%D spacing is the driving force here). It's an old mechanism used for
%D playing with stepping through document threads. As it's a simple and
%D effective mechanism we keep it around. It's not to be confused with
%D 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
\let\b_page_textflow_box\zerocount
\def\textflowcollector#1%
{\csname\??textflowbox#1\endcsname}
\unexpanded\def\doifelsetextflowcollector#1%
{\ifcsname\??textflowbox#1\endcsname
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\unexpanded\def\doifelsetextflow#1%
{\ifcsname\??textflowbox#1\endcsname
\ifvoid\csname\??textflowbox#1\endcsname
\doubleexpandafter\secondoftwoarguments
\else
\doubleexpandafter\firstoftwoarguments
\fi
\else
\expandafter\secondoftwoarguments
\fi}
\let\doiftextflowcollectorelse\doifelsetextflowcollector
\let\doiftextflowelse \doifelsetextflow
% \unexpanded\def\doiftextflow#1%
% {\doiftextflowelse{#1}\firstofoneargument\gobbleoneargument}
\unexpanded\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
\unexpanded\def\stoptextflow{\endgraf\egroup\endgroup}%
\else
\let\stoptextflow\endgroup
\fi}
\unexpanded\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
\else\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
\fi
\endgroup}
\protect \endinput
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