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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 tables
%D mechanisms. When used more frequently, we can store the color
%D spec in the attribute.
\unprotect
\registerctxluafile{node-bck}{autosuffix}
% \backgroundvbox[green] {\input tufte } \par
% \backgroundvbox[blue] {\input ward } \par
% \backgroundvbox[red] {\input knuth } \par
% \backgroundhbox[yellow]{\rotate[rotation=45]{hello world}} \par
% todo: use new register feature (but not used that much so ...)
\permanent\def\colorattr#1%
{\ifcsname\??colorattribute\currentcolorprefix#1\endcsname
\node_backgrounds_thecolorattr{\currentcolorprefix#1}%
\orelse\ifcsname\??colorattribute#1\endcsname
\node_backgrounds_thecolorattr{#1}%
\fi}
\def\node_backgrounds_thecolorattr#1%
{attr \colormodelattribute \c_attr_colormodel
attr \colorattribute \lastnamedcs
attr \transparencyattribute \rawtransparencyattribute{#1} } % can be optimized
\permanent\def\thecolorattr#1%
{attr \colormodelattribute \c_attr_colormodel
attr \colorattribute \csname\??colorattribute#1\endcsname
attr \transparencyattribute \rawtransparencyattribute{#1} } % can be optimized
\permanent\def\backgroundcolorattr#1%
{\ifcsname\??colorattribute\currentcolorprefix#1\endcsname
\node_backgrounds_thebackgroundcolorattr{\currentcolorprefix#1}%
\orelse\ifcsname\??colorattribute#1\endcsname
\node_backgrounds_thebackgroundcolorattr{#1}%
\fi}
\permanent\def\thebackgroundcolorattr#1%
{attr \backgroundattribute \plusone
attr \colormodelattribute \c_attr_colormodel
attr \colorattribute \csname\??colorattribute#1\endcsname
attr \transparencyattribute \rawtransparencyattribute{#1} } % can be optimized
\def\node_backgrounds_thebackgroundcolorattr#1%
{attr \backgroundattribute \plusone
attr \colormodelattribute \c_attr_colormodel
attr \colorattribute \lastnamedcs
attr \transparencyattribute \rawtransparencyattribute{#1} } % can be optimized
\permanent\def\thealignbackgroundcolorattr#1%
{attr \alignbackgroundattribute \plusone
attr \colormodelattribute \c_attr_colormodel
attr \colorattribute \csname\??colorattribute#1\endcsname
attr \transparencyattribute \rawtransparencyattribute{#1} } % can be optimized
\permanent\protected\def\backgroundhbox{\node_backgrounds_boxes_add\hbox}
\permanent\protected\def\backgroundvbox{\node_backgrounds_boxes_add\vbox}
\permanent\protected\def\backgroundvtop{\node_backgrounds_boxes_add\vtop}
\permanent\protected\def\backgroundline{\dontleavehmode\node_backgrounds_boxes_add\hbox}
\def\node_backgrounds_boxes_add#1[#2]%
{\localcontrolled{\clf_enablebackgroundboxes}% permits assignment
#1\backgroundcolorattr{#2}}
\protect \endinput
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