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%D \module
%D [ file=node-bck,
%D version=2009.06.08,
%D title=\CONTEXT\ Node Macros,
%D subtitle=Backgrounds,
%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 Node Support / Backgrounds}
%D This is first attempt to replacing backgrounds in a few
%D tables mechanisms.
\unprotect
\registerctxluafile{node-bck}{1.001}
\def\doinitializeboxbackgrounds
{\ctxlua{nodes.tasks.enableaction("shipouts","nodes.handlers.backgrounds")}%
\glet\doinitializeboxbackgrounds\donothing}
%D Box helpers:
% \backgroundvbox[green] {\input tufte } \par
% \backgroundvbox[blue] {\input ward } \par
% \backgroundvbox[red] {\input knuth } \par
% \backgroundhbox[yellow]{\rotate[rotation=45]{hello world}} \par
\def\doaddbackgroundtobox#1[#2]%
{\begingroup\doinitializeboxbackgrounds\faststartcolor[#2]%
\normalexpanded{\noexpand\faststopcolor\endgroup#1
attr \backgroundattribute \plusone
attr \colormodelattribute \the\attribute\colormodelattribute
attr \colorattribute \the\attribute\colorattribute
attr \transparencyattribute \the\attribute\transparencyattribute}}
\def\backgroundvbox{\doaddbackgroundtobox\vbox}
\def\backgroundvtop{\doaddbackgroundtobox\vtop}
\def\backgroundhbox{\doaddbackgroundtobox\hbox}
\def\colorattr#1%
{\ifcsname(cs:\currentpalet#1)\endcsname
\thecolorattr{\currentpalet#1}%
\else\ifcsname(cs:#1)\endcsname
\thecolorattr{#1}%
\fi\fi}
\def\thecolorattr#1%
{attr \colormodelattribute \attribute\colormodelattribute
attr \colorattribute \csname(cs:#1)\endcsname
attr \transparencyattribute \csname(ts:#1)\endcsname}
\def\backgroundcolorattr#1%
{\ifcsname(cs:\currentpalet#1)\endcsname
\thebackgroundcolorattr{\currentpalet#1}%
\else\ifcsname(cs:#1)\endcsname
\thebackgroundcolorattr{#1}%
\fi\fi}
\def\thebackgroundcolorattr#1%
{attr \backgroundattribute \plusone
attr \colormodelattribute \attribute\colormodelattribute
attr \colorattribute \csname(cs:#1)\endcsname
attr \transparencyattribute \csname(ts:#1)\endcsname}
% \def\backgroundvbox[#1]{\vbox \backgroundcolorattr{#1}}
% \def\backgroundvtop[#1]{\vtop \backgroundcolorattr{#1}}
% \def\backgroundhbox[#1]{\hbox \backgroundcolorattr{#1}}
\protect \endinput
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