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% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \slideshow {Slides style for OpTeX <2020-03-19>} % loaded on demand by \slides
\_doc -----------------------------
Default margins and design is declared here.
Note that `\_ttfont` is scaled by `mag1.15` in order to balance the
ex height of Helvetica (Heros) and LM fonts Typewriter.
The `\begtt`...`\endtt` verbatim is printed by smaller text.
\_cod -----------------------------
\_margins/1 a5l (14,14,10,3)mm % landscape A5 format
\_def\_wideformat{\_margins/1 (263,148) (16,16,10,3)mm } % 16:9 format
\_fontfam[Heros]
\_typosize[16/19]
\_famvardef\_ttfont{\_setfontsize{mag1.15}\_tt}
\_def\_urlfont{}
\_everytt={\_typosize[13/16] \advance\hsize by10mm}
\_fontdef\_fixbf{\_bf}
\_nopagenumbers
\_parindent=0pt
\_ttindent=5mm
\_parskip=5pt plus 4pt minus2pt
\_rightskip=0pt plus 1fil
\_ttindent=10pt
\_def\_ttskip{\_smallskip}
\_onlyrgb % RGB color space is better for presentations
\_doc -----------------------------
The bottom margin is set to 3\,mm. If we use 1\,mm, then baseline of
`\footline` is 2\,mm from the bottom page. This is depth of the `\Grey`
rectange used for page numbers. It is rlapped to `\hoffset` because left
margin = `\hoffset` = right margin. It is 14\,mm for narrow pages or
16\,mm for wide pages.
\_cod -----------------------------
\_footlinedist=1mm
\_footline={\_hss \_rlap{%
\_rlap{\Grey\_kern.2\_hoffset\_vrule height6mm depth2mm width.8\_hoffset}%
\_hbox to\_hoffset{\White\_hss\_folio\_kern3mm}}}
\_doc -----------------------------
The `\subtit` is defined analogicaly like `\tit`.
\_cod -----------------------------
\_eoldef\_subtit#1{\_vskip20pt {\_leftskip=0pt plus1fill \_rightskip=\_leftskip
\_subtitfont #1\_nbpar}}
\_doc -----------------------------
The `\pshow<num>` is implemented by printing the text in invisible
(transparent) font when `\layernum<<num>`.
The color font feature is used for this transparency.
\_cod -----------------------------
\_famvardef\Transparent{\_setfontcolor{FF000000}\_currvar}
\_def\_use#1#2{\_ifnum\_layernum#1\_relax#2\_fi}
\_def\_pshow#1{\_use{=#1}\Red \_use{<#1}\Transparent \_ignorespaces}
\_doc -----------------------------
The main level list is activated here. The `\_item:X` and
`\_item:x` are used and are re-defined here.
If we are in nested level of items and `\pg+` is used then
`\egroups` macro xepands to the right number of `\egroup`s
in order to close page correctly. The level of nested item lists
is saved to the `\_ilevel` register and used when we start again
the next text after `\pg+`.
\_cod -----------------------------
\_newcount\_ilevel \_newcount\_gilevel
\_def\*{*}
\_adef*{\_startitem}
\_sdef{_item:X}{\Blue\_raise.2ex\_fullrectangle{.8ex}\_kern.5em}
\_sdef{_item:x}{\Blue\_raise.3ex\_fullrectangle{.6ex}\_kern.4em}
\_style X
\_addto\_begitems{\_style x }\public \begitems ;
\_def\_egroups{\_par\_global\_gilevel=\_ilevel \_egroup}
\_everybegitems={\_advance\_ilevel by1 \_addto\_egroups{\_egroup}}
\_doc -----------------------------
The default values of `\pg;`, `\pg+` and `\pg.` are very simple.
They are used when `\showslides` is not specified.
\_cod -----------------------------
\_def\_pg#1{\_cs{_spg:#1}}
\_sdef{_spg:;}{\_vfil\_break \_lfnotenumreset}
\_sdef{_spg:.}{\_end}
\_sdef{_spg:+}{\_par}
\_doc -----------------------------
We need no numbers and no table of contents when using slides.
The `\_printsec` macro is redefined in order the title is centered
and typeset in `\Blue`.
\_cod -----------------------------
\_def\_titfont{\_typosize[42/60]\_bf \Blue}
\_def\_subtitfont{\_typosize[20/30]\_bf}
\_def\_secfont{\_typosize[25/30]\_bf \Blue}
\_nonum \_notoc \_let\_resetnonumnotoc=\_relax
\_def\_printsec#1{\_par
\_abovetitle{\_penalty-400}\_bigskip
{\_secfont \_noindent \_leftskip=0pt plus1fill \_rightskip=\_leftskip
\_printrefnum[@\_quad]#1\_nbpar}\_insertmark{#1}%
\_nobreak \_belowtitle{\_medskip}%
}
\_doc -----------------------------
When `\slideshow` is active then each page is opened (roughly speaking)
by `\setbox\_slidepage=\vbox\bgroup` and closed by `\egroup`. The material is
`\unvbox`ed and saved for the usage in the next usage if `\pg+` is in process.
The `\_slidelayer` is inceremnted instead `\pageno` if `\pg+`.
This counter is equal to `\count1`, so it is printed to the terminal and
log file next to `\pageno`.
The code is somewhat more complicated when `\layers` is used. Then
<layered-text> is saved to the `\_layertext` macro, the material before
it is in `\_sidepage` box and the material after it is in `\_slidepageB`
box. The pages are completrd in the `\loop` which increments the
`\layernum` register.
\_cod -----------------------------
\_newbox\_slidepage \_newbox\_slidepageB
\_countdef\_slidelayer=1
\_def\_decr#1{\_global\_advance#1 by-1 }
\_def\_slideshow{\_slidelayer=1 \_slideshowactive \_setbox\_slidepage=\_vbox\_bgroup}
\_def\_slideshowactive{%
\_sdef{_spg:;}{\_closepage \_global\_slidelayer=1 \_resetpage \_openslide}
\_sdef{_spg:.}{\_closepage \_end}
\_sdef{_spg:+}{\_closepage \_incr\_slidelayer \_decr\_pageno \_openslide}
\_def\bye {\_closepage \_end}
\_let\_layers=\_layersactive
\_def\_destbox[##1:##2]{\_isequal{##1}{ref}\_iffalse \_destboxori[##1:##2]\_fi}%
}
\_def\_openslide{\_setbox\_slidepage=\_vbox\_bgroup \_setilevel
\_ifvoid\_slidepage \_else \_unvbox\_slidepage \_nointerlineskip\_lastbox \_fi}
\_def\_setilevel{\_loop \_decr\_gilevel \_ifnum\_gilevel<0 \_else \_begitems \_repeat}
\_def\_closepage{\_egroups
\_ifnum \_maxlayers=0 \_unvcopy\_slidepage \_vfil\_break
\_else \_begingroup \_setwarnslides \_layernum=0
\_loop
\_ifnum\_layernum<\_maxlayers \_advance\_layernum by1
\_printlayers \_vfil\_break
\_ifnum\_layernum<\_maxlayers \_incr\_slidelayer \_decr\_pageno \_fi
\_repeat
\_global\_maxlayers=0
\_incr\_layernum \_global\_setbox\_slidepage=\_vbox{\_printlayers}%
\_endgroup
\_fi}
\_def\_resetpage{%
\_global\_setbox\_slidepage=\_box\_voidbox \_global\_setbox\_slidepageB=\_box\_voidbox
\_lfnotenumreset
}
\_def\_setwarnslides{%
\_def\pg##1{\_opwarning{\_string\pg##1 \_layersenv}\_def\pg####1{}}%
\_def\layers##1 {\_opwarning{\_string\layers\_space \_layersenv}\_def\layers####1{}}%
}
\_def\_layersenv{cannot be inside \_string\layers...\_string\endlayers, ignored}
\_def\_printlayers{\_unvcopy\_slidepage \_nointerlineskip\_lastbox
\_layertext \_endgraf
\_ifdim\_prevdepth>-1000pt \_kern-\_prevdepth \_kern\_dp\_strutbox \_fi
\_vskip\_parskip
\_unvcopy\_slidepageB
}
\_let\_destboxori=\_destbox
\_newcount\_layernum \_newcount\_maxlayers
\_maxlayers=0
\_long\_def\_layersactive #1 #2\endlayers{%
\_par\_egroup
\_gdef\_layertext{#2}%
\_global\_maxlayers=#1
\_setbox\_slidepageB=\_vbox\_bgroup
}
\_doc -----------------------------
Default `\layers <num>` macro (when `\slideshow` is not activated) is simple.
It prints the <layered-text> with `\layernum=<num>+1` because we need the
result after last layer is processed.
\_cod -----------------------------
\_def\_layers #1 {\_par\_layernum=\_numexpr#1+1\_relax}
\_let\endlayers=\_relax
\_def\layers{\_layers}
\_public \subtit \slideshow \pg \wideformat \use \pshow ;
\_doc -----------------------------
We must to redefine `\fnotenumpages` because the data from `.ref` file
are less usable for implementing such feature: the
footnote should be in more layers repeatedly. But we can suppose that
each page starts by `\pg;` macro, so we can reset the footnote counter by
this macro.
\_cod -----------------------------
\_def \_fnotenumpages {\def\_fnotenum{\_the\_lfnotenum}\_pgfnotefalse
\_def\_lfnotenumreset{\_global\_lfnotenum=0 }}
\_let \_lfnotenumreset=\_relax
\_public \fnotenumpages ;
\_endcode % ----------------------------------------------
The user manual of \OpTeX/ slides are in `op-slides.tex` file.
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