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%D \module
%D [ file=s-pre-00,
%D version=1997.07.22,
%D title=\CONTEXT\ Style File,
%D subtitle=Presentation Environment 0,
%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.
% This might go away!
%D This module provides some non core functionality that can
%D be used in the presentations styles. This module contains
%D experimental macros.
%D
%D The presentation environments are independent of each other.
%D Although they have much in common, and in many cases can be
%D exchanged, the common components are not collected in this
%D file. That way they can serve as examples of style
%D definitions.
\unprotect
\newbox \presentationstack
\newcounter \presentationcounter
\newdimen \presentationheight
\appendtoks\doglobal\newcounter\presentationcounter\to\everyshipout
\defineframedtext
[presentationshield]
\setupframedtexts
[presentationshield]
[\c!background=\v!color,
\c!backgroundcolor=StepColor,
\c!offset=\v!overlay,
\c!frame=\v!off]
\definecolor[StepColor][white]
\def\enablepresentationstep%
{\let\enablepresentationstep\relax
\useJSpreamblenow{presentation}%
\setuptexttexts
[\vbox to \textheight
{\dopresentationstep1\box\presentationstack\vfill}]}
\def\presentationstep
{\dopresentationstep0}
\def\dopresentationstep#1% not ok yet
{\global\setbox\presentationstack=\vbox
{\ifnum\presentationcounter=0
\global\presentationheight=\!!zeropoint
\fi
\ifcase#1\relax
\scratchdimen=\pagetotal
\else
\scratchdimen=\textheight
\fi
\advance\scratchdimen by -\presentationheight
\edef\presentationstepheight{\the\scratchdimen}
\global\presentationheight=\pagetotal
\forgetall
\offinterlineskip
\dontcomplain
\box\presentationstack
\doglobal\increment\presentationcounter
\scratchcounter=\realpageno \multiply\scratchcounter by 100
\advance\scratchcounter by \presentationcounter
\edef\presentationtag{presentation:\the\scratchcounter}
\setupfield
[presentation]
[\c!width=\v!fit,\c!height=\v!fit,\c!offset=\v!overlay,
\c!strut=\v!no,\c!frame=\v!off,\c!option=\v!readonly]
\definesymbol
[\presentationtag]
[\presentationshade]
\def\presentationshade
{\presentationshield
[\c!width=\textwidth,\c!height=\presentationstepheight]{}}
\definefield[\presentationtag][check][presentation][\presentationtag,\v!none][\presentationtag]
\fitfield[\presentationtag]}}
\startJSpreamble {presentation} used later
var presentation = new Array() ;
for (i=1;i<=\lastpage;i++)
{ presentation[i] = 0 }
this.dirty = false ;
function NextPresentation (pagenumber)
{ % ++presentation[pagenumber] ;
presentation[pagenumber] = presentation[pagenumber] + 1 ;
var dummy = 100*pagenumber + presentation[pagenumber] ;
var v = this.getField("presentation:"+dummy) ;
if (v)
{ v.hidden = true }
% { v.display = display.hidden }
else
{ ++pagenumber ;
if (pagenumber<=\lastpage)
{ presentation[pagenumber] = presentation[pagenumber] + 1 ;
dummy = 100*(pagenumber) + presentation[pagenumber] ;
v = this.getField("presentation:"+dummy) ;
if (v) { v.hidden = true }
% if (v) { v.display = display.hidden }
++this.pageNum } }
this.dirty = false }
\stopJSpreamble
\definereference[NextStep][JS(NextPresentation{\realfolio})]
%D \macros
%D {presentationstep}
%D
%D The macro \type {\presentationstep} provides a basic slide
%D show functionality. It sort of records pieces of the page
%D that will show up stepwise. It can be used like:
%D
%D \starttyping
%D \startitemize
%D \item eerste
%D \item tweede
%D \stopitemize
%D
%D \presentationstep
%D
%D \startformula
%D ax^2+bx+c
%D \stopformula
%D
%D \presentationstep
%D \stoptyping
%D
%D When the document is opened, the two text fragments are
%D covered by a shield. Each page has its own shield stack. The
%D logical reference \type {NextStep} can be used to hide the
%D shield.
%D
%D \starttyping
%D \setupfootertexts[{\button{Show Up}[NextStep]}]
%D \stoptyping
%D
%D In case of presentation style 2, you can say:
%D
%D \starttyping
%D \definereference[Whatever][JS(NextPresentation{\realfolio})]
%D \stoptyping
%D
%D Depending of the viewer, you need to reset the fields at
%D startup:
%D
%D \starttyping
%D \setupinteraction[openaction=ResetForm]
%D \stoptyping
%D
%D Fixed spacing give you the best results:
%D
%D \starttyping
%D \setupwhitespace[fixed]
%D \setupblank[fixed]
%D \stoptyping
%D
%D Sometimes you need to set the color of the background, as
%D with style 2:
%D
%D \starttyping
%D \definecolor[StepColor][Page]
%D \stoptyping
%D
%D Special effects can be reached with:
%D
%D \starttyping
%D \setupframedtexts
%D [presentationshield]
%D [background=color,backgroundcolor=red]
%D \stoptyping
%D
%D There is also:
%D
%D \starttyping
%D \autopresentationsteptrue
%D \stoptyping
%D
%D One can enable this feature as \type {step} mode.
\newif\ifautopresentationstep
\appendtoks \ifautopresentationstep\presentationstep\fi \to \everypar
\doifmode{step} {\enablepresentationstep}
\doifmode{autostep}{\autopresentationsteptrue\enablepresentationstep}
%D When in \type {comment} mode, embedded page comments are
%D processed and put below the page. The default space of
%D 5cm should be adequate but can of course be changed.
\doifmode{comment}{\setuppagecomment[state=start,location=bottom]}
\protect \endinput
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