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%D \module
%D [ file=pack-fen,
%D version=2011.07.21,
%D title=\CONTEXT\ Packaging Macros,
%D subtitle= Fences for Ruled Content,
%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 Packaging Macros / Fences for Ruled Content}
% we can move the main fences here too
\unprotect
\def\installleftframerenderer#1#2%
{\setvalue{l\@@frame@@\v!on#1}{\whateverleftframe{#2}}%
\expandafter\let\csname l\@@frame@@\v!off#1\expandafter\endcsname\csname l\@@frame@@\v!on#1\endcsname}
\def\installrightframerenderer#1#2%
{\setvalue{r\@@frame@@\v!on#1}{\whateverrightframe{#2}}%
\expandafter\let\csname r\@@frame@@\v!off#1\expandafter\endcsname\csname r\@@frame@@\v!on#1\endcsname}
\def\installtopframerenderer#1#2%
{\setvalue{t\@@frame@@\v!on#1}{\whatevertopframe{#2}}%
\expandafter\let\csname t\@@frame@@\v!off#1\expandafter\endcsname\csname t\@@frame@@\v!on#1\endcsname}
\def\installbottomframerenderer#1#2%
{\setvalue{b\@@frame@@\v!on#1}{\whateverbottomframe{#2}}%
\expandafter\let\csname b\@@frame@@\v!off#1\expandafter\endcsname\csname b\@@frame@@\v!on#1\endcsname}
\def\setinstalledframedimensions
{\edef\overlayheight{\the\dimexpr\frameddimenht+\frameddimendp}%
\edef\overlaywidth {\the\frameddimenwd}}
\newbox\specialframebox
\def\whateverleftframe#1%
{\setinstalledframedimensions
\setbox\specialframebox\vbox to \overlayheight{\vss#1\vss}%
\setbox\specialframebox\hbox to \zeropoint{\box\specialframebox\hss}%
\ht\specialframebox\zeropoint
\dp\specialframebox\zeropoint
\box\specialframebox}
\def\whateverrightframe#1%
{\setinstalledframedimensions
\setbox\specialframebox\vbox to \overlayheight{\vss#1\vss}%
\setbox\specialframebox\hbox to \zeropoint{\hss\box\specialframebox}%
\ht\specialframebox\zeropoint
\dp\specialframebox\zeropoint
\box\specialframebox}
\def\whatevertopframe#1%
{\setinstalledframedimensions
\setbox\specialframebox\hbox to \overlaywidth{\hss#1\hss}%
\setbox\specialframebox\vbox to \zeropoint{\box\specialframebox\vss}%
\ht\specialframebox\zeropoint
\dp\specialframebox\zeropoint
\box\specialframebox
\nointerlineskip}
\def\whateverbottomframe#1%
{\setinstalledframedimensions
\setbox\specialframebox\hbox to \overlaywidth{\hss#1\hss}%
\setbox\specialframebox\vbox to \zeropoint{\vss\box\specialframebox}%
\ht\specialframebox\zeropoint
\dp\specialframebox\zeropoint
\box\specialframebox}
\protect \endinput
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