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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
\newcount\currentsidebar
\newdimen\sidebardistance
\def\setupsidebars
{\dodoubleargument\dosetupsidebars}
\def\dosetupsidebars[#1][#2]%
{\ifsecondargument
\getparameters[\??br#1][#2]%
\else
\getparameters[\??br][#1]%
\fi}
% \setupMPvariables
% [mpos:bar]
% [linecolor=red,
% linewidth=2pt,
% distance=5pt]
\setupsidebars
[\c!rulethickness=2pt,
\c!rulecolor=red,
\c!distance=.5\bodyfontsize]
\def\definesidebar
{\dodoubleempty\dodefinesidebar}
\def\dodefinesidebar[#1][#2]%
{\copyparameters
[\??br#1][\??br]
[\c!rulethickness,\c!rulecolor,\c!distance]%
\getparameters
[\??br#1][#2]}
\def\startsidebar
{\dosingleempty\dostartsidebar}
\def\dostartsidebar[#1]%
{\bgroup
\dontleavehmode
\checktextbackgrounds
\global\advance\currentsidebar\plusone
\doifelsenothing{#1}
{\advance\sidebardistance\@@brdistance}
{\doifelsevaluenothing{\??br#1\c!distance}
{\advance\sidebardistance\@@brdistance}
{\sidebardistance\getvalue{\??br#1\c!distance}}}%
\startpositionoverlay{text-1}%
\expanded{\setMPpositiongraphicrange
{b:side:\the\currentsidebar}%
{e:side:\the\currentsidebar}%
{mpos:bar}%
{self=side:\the\currentsidebar,
linewidth=\getvalue{\??br#1\c!rulethickness},
linecolor=\getvalue{\??br#1\c!rulecolor},
distance=\the\sidebardistance}}%
\stoppositionoverlay
\bpos{side:\the\currentsidebar}\ignorespaces}
% \def\dostopsidebar#1%
% {\removelastspace\tpos{side:#1}\carryoverpar\egroup}
\def\stopsidebar
{\removelastspace\tpos{side:\the\currentsidebar}\carryoverpar\egroup}
\startMPpositionmethod{mpos:bar}
\startMPpositiongraphic{mpos:bar}{linecolor,linewidth,distance}%
StartPage ;
path p ; p :=
if \MPp\MPbself=\MPp\MPeself :
(xpart ulcorner Field[Text][Text],\MPy\MPbself+\MPh\MPbself) --
(xpart llcorner Field[Text][Text],\MPy\MPeself-\MPd\MPeself) ;
elseif RealPageNumber=\MPp\MPbself :
(xpart ulcorner Field[Text][Text],\MPy\MPbself+\MPh\MPbself) --
(llcorner Field[Text][Text]) ;
elseif RealPageNumber=\MPp\MPeself :
(ulcorner Field[Text][Text]) --
(xpart llcorner Field[Text][Text],\MPy\MPeself-\MPd\MPeself) ;
else :
(ulcorner Field[Text][Text]) --
(llcorner Field[Text][Text]) ;
fi ;
p := p shifted (-llcorner Field[Text][Text]-(\MPvar{distance},0)) ;
interim linecap := butt ;
draw p
withpen pencircle scaled \MPvar{linewidth}
withcolor \MPvar{linecolor} ;
StopPage ;
\stopMPpositiongraphic
\MPpositiongraphic{mpos:bar}{}%
\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!rulecolor=\s!black,
\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
\@EA\startsidebar\@EA[\@EA\v!margin\@EA]%
\fi}
\def\dostopmarginrule
{\stopsidebar
\egroup}
\protect \endinput
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