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%D \module
%D [ file=attr-lay,
%D version=2007.06.06,
%D title=\CONTEXT\ Attribute Macros,
%D subtitle=Viewerlayers,
%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 Attribute Macros / Viewerlayers}
\unprotect
\registerctxluafile{attr-lay}{1.001}
% needs to work over stopitemize grouping etc
% \def\registerviewerlayer#1#2% global !
% {\setxvalue{\??ql:#1}{\global\attribute\viewerlayerattribute\ctxlua{tex.write(attributes.viewerlayers.register('#2'))} }}
%
% \setevalue{\??ql:}{\global\attribute\viewerlayerattribute\attributeunsetvalue}
\getparameters
[\??lr]
[\c!state=\v!start,
\c!title=,
\c!printable=\v!yes,
\c!scope=\v!local, % maybe global but needs checking with layout
\c!method=\v!none]
\def\defineviewerlayer
{\dodoubleargument\dodefineviewerlayer}
\def\dodefineviewerlayer[#1][#2]% document wide properties
{\begingroup
\getparameters[\??lr][#2]%
\ctxcommand{defineviewerlayer{
tag = "#1",
title = "\@@lrtitle",
visible = "\@@lrstate",
editable = "\v!yes",
printable = "\@@lrprintable",
scope = "\@@lrscope"
}}%
\doif\@@lrmethod\v!command
{\setugvalue{\e!start#1}{\startviewerlayer[#1]}%
\setugvalue{\e!stop #1}{\stopviewerlayer }}%
\endgroup}
\unexpanded\def\startviewerlayer[#1]{\ctxcommand{startviewerlayer("#1")}} % not grouped
\unexpanded\def\stopviewerlayer {\ctxcommand{stopviewerlayer()}} % not grouped
\unexpanded\def\viewerlayer [#1]{\groupedcommand{\startviewerlayer[#1]}{\stopviewerlayer}} % grouped
% some day we will keep this at the lua end as the info is only needed there
\let\currentviewerlayer\empty \newtoks\currentviewerlayertoks % soon we can set macros at the lua end
\def\currentviewerlayer{\the\currentviewerlayertoks}
\appendtoks
\let\currentviewerlayer\empty
\to \everybeforepagebody
% layout components are implemented rather directly (speed)
\def\doinitializelayoutcomponent#1%
{\edef\layoutcomponentboxattribute{\ctxcommand{definedviewerlayer{%
tag = "#1",
title = utilities.strings.nice("#1"), % only here as in steps we have step:<number>
visible = "\v!start",
editable = "\v!yes",
printable = "\v!yes"
}}}%
\edef\layoutcomponentboxattribute{attr \viewerlayerattribute \layoutcomponentboxattribute\relax}%
\expandafter\glet\csname\??lr:a:#1\endcsname\layoutcomponentboxattribute}
\def\dosetlayoutcomponentattribute#1% make this faster
{\expandafter\let\expandafter\layoutcomponentboxattribute\csname\??lr:a:#1\endcsname
\ifx\layoutcomponentboxattribute\relax
\doinitializelayoutcomponent{#1}% get rid of { }
\fi}
\def\doresetlayoutcomponentattribute
{\let\layoutcomponentboxattribute\empty}
\let\setlayoutcomponentattribute \gobbleoneargument
\let\resetlayoutcomponentattribute\relax
\let\layoutcomponentboxattribute \empty
\def\showlayoutcomponents
{\ctxlua{attributes.viewerlayers.enable()}% will go
\let\setlayoutcomponentattribute \dosetlayoutcomponentattribute
\let\resetlayoutcomponentattribute\doresetlayoutcomponentattribute}
\protect \endinput
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