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%D \module
%D [ file=scrn-ini,
%D version=2011.02.27,
%D title=\CONTEXT\ Interaction Macros,
%D subtitle=Initialization,
%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 Interaction Macros / Initialization}
\unprotect
\registerctxluafile{scrn-ini}{autosuffix}
%D There is no interaction at all unless enabled by saying:
%D
%D \starttyping
%D \setupinteraction[state=start]
%D \stoptyping
%D
%D The other settings are:
%D
%D \showsetup{setupinteraction}
\installcorenamespace{interaction}
\installswitchcommandhandler \??interaction {interaction} \??interaction
\appendtoks
\ifempty\previousinteraction
\checkinteractionstate
\orelse\ifx\currentinteraction\previousinteraction
\checkinteractionstate
\fi
\to \everysetupinteraction
\permanent\protected\def\checkinteractionstate
{\doifelse{\interactionparameter\c!state}\v!start
{\locationtrue \setsystemmode \v!interaction}%
{\locationfalse \resetsystemmode\v!interaction}}
\permanent\def\doifelselocation % expandable
{\iflocation
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\aliased\let\doiflocationelse\doifelselocation
\setupinteraction
[\c!state=\v!stop]
\setupinteraction
[\c!title=,
\c!subtitle=,
\c!author=,
\c!keyword=,
\c!date=]
\appendtoks
\setupinteraction % todo: remember info at the lua end (already possible)
\to \everyjob
% it makes no sense to create an environment as we will seldom have structured
% interactions so a general start-stop will do
%
% \appendtoks
% \setuevalue \currentinteraction {\scrn_interaction_direct{\currentinteraction}}%
% \setuevalue{\e!start\currentinteraction}{\scrn_interaction_start {\currentinteraction}}%
% \setuevalue{\e!stop \currentinteraction}{\scrn_interaction_stop }%
% \to \everydefineinteraction
%
% \protected\def\scrn_interaction_direct#1%
% {\edef\currentinteraction{#1}}
%
% \protected\def\scrn_interaction_start#1%
% {\pushmacro\currentinteraction
% \edef\currentinteraction{#1}}
%
% \protected\def\scrn_interaction_stop
% {\popmacro\currentinteraction}
%
% \protected\def\setinteraction[#1]%
% {\def\currentinteraction{#1}}
%
% \defineinteraction[\v!interaction]
\permanent\protected\def\startinteraction[#1]%
{\pushmacro\currentinteraction
\edef\currentinteraction{#1}}
\permanent\protected\def\stopinteraction
{\popmacro\currentinteraction}
\permanent\protected\def\setinteraction[#1]%
{\def\currentinteraction{#1}}
\defineinteraction % keep it simple
[\v!hidden]
\setupinteraction
[\v!hidden]
[\c!state=\v!start,
\c!color=,
\c!contrastcolor=,
\c!style=,
\c!click=\v!off]
%D As long as there a natural feeling of what can be considered
%D hyper active or not, we have to tell users where they can
%D possibly click. We've already seen a few macros that deal
%D with this visualization, something we definitely do not let
%D up to the viewer. One way of telling is using a distinctive
%D typeface, another way is using color.
%D
%D There are two colors involved: one for normal hyperlinks,
%D and one for those that point to the currentpage, the
%D contrast color.
\definecolor [interactioncolor] [r=0, g=.6, b=0]
\definecolor [interactioncontrastcolor] [r=.8, g=0, b=0]
%D The next few macros are responsible for highlighting hyper
%D links. The first one, \type{\showlocation}, is used in those
%D situations where the typeface is handled by the calling
%D macro.
%D When we're dealing with pure page references, contrast
%D colors are used when we are already at the page mentioned.
\permanent\protected\def\setlocationcolorspecified#1% not grouped !
{\ifnum#1=\plusone
\edef\p_contrastcolor{\interactionparameter\c!contrastcolor}%
\ifempty\p_contrastcolor
\useinteractioncolorparameter\c!color
\else
\useinteractioncolorparameter\c!contrastcolor
\fi
\else % we could just set and if > 0 set again
\useinteractioncolorparameter\c!color
\fi}
\permanent\protected\def\setlocationattributesspecified#1% not grouped !
{\ifnum#1=\plusone
\edef\p_contrastcolor{\interactionparameter\c!contrastcolor}%
\ifempty\p_contrastcolor
\useinteractionstyleandcolor\c!style\c!color
\else
\useinteractionstyleandcolor\c!style\c!contrastcolor
\fi
\else % we could just set and if > 0 set again
\useinteractionstyleandcolor\c!style\c!color
\fi}
\permanent\protected\def\setlocationcolorspecspecified#1#2% \resolver
{\ifnum#1=\plusone
\edef\p_contrastcolor{#2\c!contrastcolor}%
\ifempty\p_contrastcolor
\colo_helpers_activate{#2\c!color}%
\else
\colo_helpers_activate\p_contrastcolor
\fi
\else
\colo_helpers_activate{#2\c!color}%
\fi}
\permanent\protected\def\setlocationcolor {\setlocationcolorspecified \referencepagestate}
\permanent\protected\def\setlocationattributes{\setlocationattributesspecified\referencepagestate}
\permanent\protected\def\setlocationcolorspec {\setlocationcolorspecspecified \referencepagestate}
\permanent\protected\def\setlocationfont % not grouped !
{\useinteractionstyleparameter\c!style}
\setupinteraction
[\c!style=\v!bold,
\c!color=interactioncolor,
\c!contrastcolor=interactioncontrastcolor]
%D Identity
%D We want to delay the preroll as it needs fonts so we now actively fetch from
%D the \LUA\ end. So this one gets called by the time we need the value.
\def\scrn_identity_get#1%
{\clf_setidentityvariable{#1}{\prerolltostring{\interactionparameter{#1}}}}
% this comes before starttext
\def\scrn_identity_document#1#2%
{\doifdocumentvariable{metadata:#1}{\setupinteraction[#2=\documentvariable{metadata:#1}]}}
\appendtoks % not interfaced i.e. english
\scrn_identity_document {title}\c!title
\scrn_identity_document {subject}\c!subtitle
\scrn_identity_document{subtitle}\c!subtitle
\scrn_identity_document {author}\c!author
\scrn_identity_document {authors}\c!author
\scrn_identity_document {keyword}\c!keyword
\scrn_identity_document{keywords}\c!keyword
\scrn_identity_document {date}\c!date
\to \everystartdocument % or stop
\appendtoks
\clf_setautoprefix{\interactionparameter\c!prefix}%
\to \everysetupinteraction
\protect \endinput
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