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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]
%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).
\unprotect
\def\definetextflow
{\dodoubleempty\dodefinetextflow}
\def\dodefinetextflow[#1][#2]% flow settings
{\iffirstargument
\doiftextflowcollectorelse{#1}
{\setbox\textflowcollector{#1}\emptybox}
{\@EA\newbox\csname\??tx:c:#1\endcsname}%
\getparameters[\??tx:p:#1]
[\c!width=\hsize,\c!style=,#2]%
\fi}
\def\textflowparameter#1#2{\csname\??tx:p:#1#2\endcsname}
\def\textflowcollector #1{\csname\??tx:c:#1\endcsname}
\def\doiftextflowcollectorelse#1{\doifdefinedelse{\??tx:c:#1}}
\def\doiftextflowelse#1%
{\doiftextflowcollectorelse{#1}
{\ifvoid\textflowcollector{#1}%
\expandafter\secondoftwoarguments
\else
\expandafter\firstoftwoarguments
\fi}
{\secondoftwoarguments}}
\def\doiftextflow#1%
{\doiftextflowelse{#1}\firstofoneargument\gobbleoneargument}
\def\starttextflow[#1]%
{\doiftextflowcollectorelse{#1}
{\global\setbox\textflowcollector{#1}\vbox
\bgroup
\unvbox\textflowcollector{#1}%
\hsize\textflowparameter{#1}\c!width
\doifsomething{\textflowparameter{#1}\c!style}%
{\doconvertfont{\textflowparameter{#1}\c!style}}%
\def\stoptextflow{\endgraf\egroup}}
{\let\stoptextflow\relax}}
\def\flushtextflow#1%
{\doiftextflow{#1}
{\ifdim\ht\textflowcollector{#1}>\vsize
\setbox\scratchbox\vsplit\textflowcollector{#1} to \vsize
\unvbox\scratchbox
\else
\unvbox\textflowcollector{#1}%
\fi}}
\protect \endinput
% Example (dutch)
%
% \stelpapierformaatin [S6]
% \steltolerantiein [soepel,rek]
% \stelkleurenin [status=start]
% \stelvoetin [strut=nee]
% \stelwitruimtein [groot]
%
% \stellayoutin
% [rechterrand=5cm,breedte=passend,marge=0pt,randafstand=1cm,
% voet=4cm,voetafstand=1cm,hoofd=0cm]
%
% \stelteksttekstenin[rand][][\vbox{\flushtextflow{alpha}}]
% \stelvoettekstenin [rand][][\vbox{\flushtextflow{beta}}]
% \stelvoettekstenin [\vbox{\flushtextflow{gamma}}][]
%
% \definetextflow [alfa] [breedte=\rechterrandbreedte]
% \definetextflow [beta] [breedte=\rechterrandbreedte]
% \definetextflow [gamma] [breedte=\voethoogte]
%
% \starttekst
%
% \dorecurse{50}
% {\getrandomnumber{\funny}{0}{8}
% \ifcase\funny \starttextflow[alfa] \input tufte.tex \stoptextflow
% \or \starttextflow[beta] \input knuth.tex \stoptextflow
% \or \starttextflow[gamma] \input materie.tex \stoptextflow
% \or {\bf TUFTE}\quad \input tufte \par
% \or {\bf TUFTE}\quad \input tufte \par
% \or {\bf KNUTH}\quad \input knuth \par
% \or {\bf KNUTH}\quad \input knuth \par
% \or {\bf MATERIE}\quad \input materie \par
% \else {\bf MATERIE}\quad \input materie \par
% \fi}
%
% \stoptekst
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