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%D \module
%D [ file=anch-bar,
%D version=2003.03.16,
%D title=\CONTEXT\ Anchoring Macros,
%D subtitle=Margin Bars and alike,
%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 Anchoring Macros / Margin Bars}
\unprotect
%D We will implement a sidebar mechanism using the
%D functionality from \type {core-pos}.
%D
%D \starttyping
%D \definesidebar[whow][rulecolor=green,distance=]
%D
%D \input tufte \par
%D \startsidebar
%D \input tufte \par
%D \input tufte \par
%D \startsidebar[whow]
%D \input tufte \par
%D \input tufte \par
%D \input tufte
%D \stopsidebar \par
%D \input tufte \par
%D \input tufte
%D \stopsidebar \par
%D \input tufte \par
%D \input tufte \par
%D \startsidebar
%D \input tufte \par
%D \input tufte \par
%D \input tufte \par
%D \input tufte \par
%D \input tufte
%D \stopsidebar \par
%D \input tufte \par
%D \input tufte \par
%D \startsidebar
%D \input tufte
%D \input tufte
%D \input tufte
%D \input tufte
%D \input tufte
%D \stopsidebar
%D \stoptyping
\installcorenamespace{sidebar}
\installcommandhandler \??sidebar {sidebar} \??sidebar
\newcount\c_anch_sidebars_n
\newdimen\c_anch_sidebars_distance
% \setupMPvariables
% [mpos:sidebar]
% [linecolor=red,
% linewidth=2pt,
% distance=5pt]
\setupsidebar
[\c!rulethickness=2pt,
\c!rulecolor=\s!black,
\c!alternative=0,
\c!topoffset=0pt,
\c!bottomoffset=0pt,
\c!distance=.5\bodyfontsize]
\let\setupsidebars\setupsidebar
\unexpanded\def\startsidebar
{\dosingleempty\anch_sidebars_start}
\def\anch_sidebars_start[#1]%
{\bgroup
\def\currentsidebar{#1}%
\dontleavehmode
\global\advance\c_anch_sidebars_n\plusone
\advance\c_anch_sidebars_distance\sidebarparameter\c!distance
\startpositionoverlay{text-1}%
\normalexpanded{\setMPpositiongraphicrange % maybe expand in definition
{b:sidebar:\the\c_anch_sidebars_n}%
{e:sidebar:\the\c_anch_sidebars_n}%
{mpos:sidebar}%
{self=sidebar:\the\c_anch_sidebars_n,
linewidth=\sidebarparameter\c!rulethickness,
linecolor=\sidebarparameter\c!rulecolor,
alternative=\sidebarparameter\c!alternative,
topoffset=\sidebarparameter\c!topoffset,
bottomoffset=\sidebarparameter\c!bottomoffset,
distance=\the\c_anch_sidebars_distance}}%
\stoppositionoverlay
\bpos{sidebar:\the\c_anch_sidebars_n}}
\unexpanded\def\stopsidebar
{\removelastspace
\epos{sidebar:\the\c_anch_sidebars_n}
\carryoverpar\egroup}
%D Let's keep this nice and simple (okay, we could pass the 6 variables in
%D one lua call).
\startMPpositionmethod{mpos:sidebar}
\startMPpositiongraphic{mpos:sidebar}{linecolor,linewidth,distance,alternative}%
if unknown context_apos : input mp-apos.mpiv ; fi ;
anch_sidebars_draw (
\MPp\MPbself,\MPp\MPeself,\MPy\MPbself,\MPy\MPeself,\MPh\MPbself,\MPd\MPeself,
\MPx{\textanchor},\MPy{\textanchor},\MPw{\textanchor},\MPh{\textanchor},
\MPvar{alternative},\MPvar{distance},\MPvar{linewidth},\MPvar{linecolor},
\MPvar{topoffset}, \MPvar{bottomoffset}
) ;
\stopMPpositiongraphic
\MPpositiongraphic{mpos:sidebar}{}%
\stopMPpositionmethod
%D We now reimplement the margin rules handler defined in
%D \type {core-rul}:
%D
%D \setupmarginrules[level=5]
%D
%D \startmarginrule[1]
%D First we set the level at~5. Next we typeset this first
%D paragraph as a level~1 one. As expected no rule show up.
%D \stopmarginrule
%D
%D \startmarginrule[5]
%D The second paragraph is a level~5 one. As we can see here,
%D the marginal rule gets a width according to its level.
%D \stopmarginrule
%D
%D \startmarginrule[8]
%D It will of course be no surprise that this third paragraph
%D has a even thicker margin rule. This behavior can be
%D overruled by specifying the width explictly.
%D \stopmarginrule
\definesidebar
[\v!margin]
[\c!rulethickness=\@@karulethickness,
\c!distance=\dimexpr\leftmargindistance-\@@karulethickness/2\relax]
\definecomplexorsimple\startmarginrule
\def\simplestartmarginrule
{\complexstartmarginrule[1]}
\def\complexstartmarginrule[#1]%
{\bgroup
\ifnum#1<\@@kalevel\relax
\let\stopmarginrule\egroup
\else
\def\@@kadefaultwidth{#1}%
\let\stopmarginrule\dostopmarginrule
\normalexpanded{\startsidebar[\v!margin]}% why expanded
\fi}
\def\dostopmarginrule
{\stopsidebar
\egroup}
\protect \endinput
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