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%D \module
%D [ file=scrn-hlp,
%D version=1998.10.10,
%D title=\CONTEXT\ Screen Macros,
%D subtitle=Help (Experimental),
%D author={Hans Hagen \& Ton Otten},
%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 Screen Macros / Help popups}
%D As this functionality was in the core and as I don't know how often it is used,
%D we'll keep it around. However, it is upgraded and usage has changed a bit. We
%D also use some \LUA\ magic in order to avoid multiple passes.
\registerctxluafile{scrn-hlp}{}
%D Using help boils down to plugging the placement macro someplace visible, like:
%D
%D \starttyping
%D \setuptexttexts[\centerbox{\placehelp}]
%D \stoptyping
%D
%D When this is done, the following should work out okay:
%D
%D \starttyping
%D test \helptext{word}{tip top 1 is somewhat longer} test
%D test \helptext{word}{tip top 2} test
%D
%D \starthelptext[oeps]
%D \input tufte
%D \stophelptext
%D
%D test test \showhelp{some help}[oeps] test
%D test test \button[location=depth]{\helpsignal{oeps}OEPS}[oeps] test
%D
%D test test \button[location=depth]{next}[page(2)] test
%D
%D \page
%D
%D test \helptext{word}{tip top one} test
%D test \helptext{word}{tip top two} test
%D \stoptyping
%D
%D Currently you need to use the signal in custom macros but that might change at
%D some point.
\unprotect
% also status
\newbox \b_scrn_help_box
\newinteger\c_scrn_help_n
\definesystemattribute[help][public]
\installcorenamespace{popuphelp}
\installframedcommandhandler \??popuphelp {help} \??popuphelp
\setuphelp
[\c!frame=\v!off,
\c!align=\v!normal,
\c!background=\v!color,
\c!backgroundcolor=gray]
\appendtoks
\frozen\instance\protected\edefcsname \currenthelp\endcsname{\scrn_help_argument{\currenthelp}}%
\frozen\instance\protected\edefcsname\e!start\currenthelp\endcsname{\scrn_help_start {\currenthelp}}%
\frozen\instance\protected\edefcsname\e!stop \currenthelp\endcsname{\scrn_help_stop }%
\to \everydefinehelp
\mutable\lettonothing\currenthelpreference
\mutable\lettonothing\currenthelpname
\protected\def\scrn_help_argument#category%
{\def\currenthelp{#category}%
\global\advanceby\c_scrn_help_n\plusone
\edef\currenthelpname{help:\number\c_scrn_help_n}%
\doifelselocation\scrn_help_argument_indeed\scrn_help_argument_ignore}
\tolerant\def\scrn_help_argument_indeed[#reference]#:#text#target%
{\edef\currenthelpreference{#reference}%
\dontleavehmode \hbox \bgroup
\dontcomplain
\setbox\b_scrn_help_box\hbox{\strut#text}%
\scrn_help_register{#target}%
\egroup % can be usernode instead
\goto
{\helpsignal{\number\c_scrn_help_n}#target}%
[\helpaction{\number\c_scrn_help_n}]}
\tolerant\def\scrn_help_argument_ignore[#reference]#:#text#target%
{#target}
\tolerant\protected\def\scrn_help_start#category#spacer[#reference]%
{\global\advanceby\c_scrn_help_n\plusone
\edef\currenthelp{#category}%
\edef\currenthelpreference{#reference}%
\edef\currenthelpname{help:\number\c_scrn_help_n}%
\grabbufferdatadirect\currenthelp{\e!start\currenthelp}{\e!stop\currenthelp}}
\protected\def\scrn_help_stop
{\iflocation
\scrn_help_register{\getbuffer[\currenthelp]}%
\fi}
\def\scrn_help_register#text%
{\setbox\b_scrn_help_box\hbox{\inheritedhelpframed{#text}}% \hpack ?
\definesymbol
[\currenthelpname]
[\copy\b_scrn_help_box]%
\definefieldbody
[\currenthelpname]
[\c!type=push,
\c!width=\wd\b_scrn_help_box,
\c!height=\ht\b_scrn_help_box,
\c!depth=\dp\b_scrn_help_box,
\c!option=\v!hidden,
\c!clickin=action(hide{\currenthelpname}),
\c!closepage=action(hide{\currenthelpname}),
\c!values=\currenthelpname]%
\setbox\b_scrn_help_box\hbox
{\fieldbody[\currenthelpname]}%
\clf_registerhelp
number \c_scrn_help_n
name {\currenthelpreference}%
box \b_scrn_help_box
\relax}
\permanent\protected\def\doifelsehelp
{\ifcase\c_scrn_help_n
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\aliased\let\doifhelpelse\doifelsehelp
\permanent\protected\def\placehelp % was \helpdata
{\ifinpagebody\ifcase\c_scrn_help_n\else
\clf_collecthelp\normalpagebox
\fi\fi}
\permanent\def\helpreference#category{\clf_helpreference{#category}} % could be public implementors
\permanent\def\helpaction #category{\clf_helpaction {#category}} % could be public implementors
\permanent\protected\def\helpsignal#category%
{\hbox attr \helpattribute \helpreference{#category}{}}
\permanent\protected\def\showhelp#target[#category]%
{\goto{\helpsignal{#category}#target}[#category]}
\definehelp[\v!helptext]
\protect \endinput
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