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-% This is part of the OpTeX project, see http://petr.olsak.net/optex
-
-\_codedecl \slideshow {Slides style for OpTeX <2021-03-10>} % loaded on demand by \slides
-
- \_doc -----------------------------
- Default margins and design is declared here.
- The `\_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
-
-\_ifx\_fontnamegen\_undefined \_fontfam[Heros]
- \_let\_ttfont=\_undefined \_famvardef\_ttfont{\_setfontsize{mag1.15}\_tt}
-\_fi
-\_typosize[16/19]
-\_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 the baseline of
- `\footline` is 2\,mm from the bottom page. This is the depth of the `\Grey`
- rectangle used for page numbers. It is r-lapped to `\hoffset` width 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 analogically like `\tit`.
- \_cod -----------------------------
-
-\_eoldef\_subtit#1{\_vskip20pt {\_leftskip=0pt plus1fill \_rightskip=\_leftskip
- \_subtitfont #1\_nbpar}}
-
- \_doc -----------------------------
- The \`\pshow``<num>` prints the text in invisible
- (transparent) font when \^`\layernum`\code{<}`<num>`.
- The transparency is set by `\pdfpageresoyrces` primitive.
- \_cod -----------------------------
-
-\pdfpageresources{/ExtGState << /Invisible << /Type /ExtGState /ca 0 /CA 0 >>
- /Visible << /Type /ExtGState /ca 1 /CA 1 >> >>}
-\addto\_morepgresources{/Invisible << /Type /ExtGState /ca 0 /CA 0 >>
- /Visible << /Type /ExtGState /ca 1 /CA 1 >>}
-\def\Invisible {\_pdfliteral{/Invisible gs}}
-\def\Visible {\_pdfliteral{/Visible gs}}
-\def\Transparent {\Invisible \_aftergroup \Visible}
-
-\_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 of items is activated here. The `\_item:X` and
- `\_item:x` are used and are re-defined here.
- If we are in a nested level of items and `\pg+` is used then
- `\egroups` macro expands to the right number of `\egroup`s
- to close the 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\_gilevel
-\_def\*{*}
-\_adef*{\_relax\_ifmmode*\_else\_ea\_startitem\_fi}
-\_sdef{_item:X}{\Blue\_raise.2ex\_fullrectangle{.8ex}\_kern.5em}
-\_sdef{_item:x}{\Blue\_raise.3ex\_fullrectangle{.6ex}\_kern.4em}
-\_style X
-\_def\_egroups{\_par\_global\_gilevel=\_ilevel \_egroup}
-\_everylist={\_novspaces \_ifcase\_ilevel \_or \_style x \_else \_style - \_fi
- \_addto\_egroups{\_egroup}}
-
- \_doc -----------------------------
- The default values of \`\pg`, i.\,e.\ `\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:.}{\_endslides}
-\_sdef{_spg:+}{\_par}
-
- \_doc -----------------------------
- The \`\_endslides` is defined as `\_end` primitive, but
- slide-designer can redefine it. For example,
- \ulink[http://petr.olsak.net/optex/optex-tricks.html\#slider]{OpTeX trick 0029}
- shows how to define clickable navigation to the pages and how to check
- the data integrity at the end of the document using `\_endslides`.
-
- The `\bye` macro is redefined here as an alternative to `\pg.`.
- \_cod -----------------------------
-
-\_def\_endslides{\_end}
-\_def\bye{\_pg.}
-
- \_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
- by `\setbox\_slidepage=\vbox\bgroup` (roughly speaking)
- 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 incremented 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 \`\_slidepage` box and the material after it is in `\_slidepageB`
- box. The pages are completed in the `\loop` which increments the
- \`\layernum` register.
- \_cod -----------------------------
-
-\_newbox\_slidepage \_newbox\_slidepageB
-\_countdef\_slidelayer=1
-
-\_def\_slideshow{\_slidelayer=1 \_slideshowactive
- \_let\slideopen=\_relax % first wins
- \_setbox\_slidepage=\_vbox\_bgroup\_bgroup}
-
-\_def\_slideshowactive{%
- \_sdef{_spg:;}{\_closepage \_global\_slidelayer=1 \_resetpage \_openslide}
- \_sdef{_spg:.}{\_closepage \_endslides}
- \_sdef{_spg:+}{\_closepage \_incr\_slidelayer \_decr\_pageno \_openslide}
- \_let\_layers=\_layersactive
- \_destboxslide % to prevent hyperlink-dests duplication
-}
-\_def\_destboxslide{\_def\_destbox[##1:##2]{\_isequal{##1}{ref}\_iffalse \_destboxori[##1:##2]\_fi}}
-
-\_def\_openslide{\_setbox\_slidepage=\_vbox\_bgroup\_bgroup \_setilevel
- \_ifvoid\_slidepage \_else \_unvbox\_slidepage \_nointerlineskip\_lastbox \_fi}
-\_def\_setilevel{\_loop \_decr\_gilevel \_ifnum\_gilevel<0 \_else \_begitems \_repeat}
-
-\_def\_closepage{\_egroups \_egroup
- \_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\_penalty0\_egroup
- \_gdef\_layertext{#2}%
- \_global\_maxlayers=#1
- \_setbox\_slidepageB=\_vbox\_bgroup
-}
-\_def\_slideopen{\_let\slideshow=\_relax % first wins
- \_sdef{_spg:;}{\_egroups\_vfil\_break \_lfnotenumreset\_bgroup \_setilevel}
- \_sdef{_spg:.}{\_egroups\_endslides}
- \_sdef{_spg:+}{\_egroups\_bgroup \_setilevel}
- \_bgroup
-}
-
-\_public \subtit \slideshow \slideopen \pg \wideformat \use \pshow \layernum ;
-
- \_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}
-
- \_doc -----------------------------
- We must to redefine \`\fnotenumpages` because the data from `.ref` file
- are less usable for implementing such a 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.
-
-2021-03-10 \slideopen introduced, bug with colors in \setbox fixed
-2021-03-10 \ifmmode* added to \adef*
-2021-02-15 \_def\_decr removed
-2021-01-16 \layers at empty page raises error: problem fixed
-2020-03-19 slides introduced