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+%D \module
+%D [ file=scrn-bar, % was part of scrn-int
+%D version=1995.01.01,
+%D title=\CONTEXT\ Core Macros,
+%D subtitle=Progress Bars,
+%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 Screen Macros / Progress Bars}
+
+\unprotect
+
+%D The code is a bit upgraded to \MKIV\ but the output is mostly the same. In
+%D retrospect this should have been a module. We can move some definitions to
+%D scrn-run-bar.mkiv if needed. We can also make the code a bit more efficient.
+
+% todo: replace blackrule by stupid rules
+
+%D \starttyping
+%D \setupinteraction
+%D [state=start]
+%D
+%D \setupsubpagenumber
+%D [state=start]
+%D
+%D \setuplayout
+%D [middle]
+%D
+%D \setuppapersize
+%D [S4][S4]
+%D
+%D \startsetups bars
+%D \ruledvbox to \textheight \bgroup
+%D a \ruledhbox{\interactionbar[a]}\vss
+%D b \ruledhbox{\interactionbar[b]}\vss
+%D c \ruledhbox{\interactionbar[c]}\vss
+%D d \ruledhbox{\interactionbar[d]}\vss
+%D e \ruledhbox{\interactionbar[e]}\vss
+%D f \ruledhbox{\interactionbar[f]}\vss
+%D g \ruledhbox{\interactionbar[g]}\vss
+%D \egroup
+%D \stopsetups
+%D
+%D \setuptexttexts[\setups{bars}]
+%D
+%D \starttext
+%D \dorecurse {12} {
+%D \startstandardmakeup
+%D \stopstandardmakeup
+%D }
+%D \stoptext
+%D \stoptyping
+
+\installcorenamespace{interactionbar}
+
+\installframedcommandhandler \??interactionbar {interactionbar} \??interactionbar
+
+\permanent\tolerant\protected\def\interactionbar[#tag]#spacer[#settings]% somewhat messy
+ {\iflocation
+ \begingroup
+ \ifhastok={#tag}%
+ \let\currentinteractionbar\empty
+ \setupcurrentinteractionbar[#tag]%
+ \edef\currentinteractionbar{\interactionbarparameter\c!alternative}%
+ \else
+ \edef\currentinteractionbar{#tag}%
+ \setupcurrentinteractionbar[#settings]%
+ \fi
+ \doif{\interactionbarparameter\c!state}\v!start
+ {\interactionbarparameter\c!command}%
+ \endgroup
+ \fi}
+
+\newdimen\d_scrn_bar_width
+\newdimen\d_scrn_bar_height
+\newdimen\d_scrn_bar_depth
+\newdimen\d_scrn_bar_distance
+
+%D Interaction buttons, in fact a row of tiny buttons, are typically only used for
+%D navigational purposed. The next macro builds such a row based on a specification
+%D list.
+%D
+%D \startbuffer
+%D \interactionbuttons[width=\hsize][page,PreviousJump,ExitViewer]
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D gives
+%D
+%D \getbuffer
+%D
+%D Apart from individual entries, one can use \type{page} and \type {subpage} as
+%D shortcuts to their four associated buttons. The symbols are derived from the
+%D symbols linked to the entries.
+
+\permanent\tolerant\protected\def\interactionbuttons[#settings]#spacer[#list]%
+ {\iflocation
+ \ifcstok{\interactionbarparameter\c!state}\v!start
+ \ifparameter#list\or
+ \scrn_bar_buttons_indeed{#settings}{#list}%
+ \else
+ \scrn_bar_buttons_indeed{}{#settings}%
+ \fi
+ \fi
+ \fi}
+
+\def\scrn_bar_buttons_indeed#settings#list%
+ {\begingroup
+ %\let\currentinteractionbar\empty
+ \setupcurrentinteractionbar[#settings]%
+ \d_scrn_bar_width \interactionbarparameter\c!width\relax
+ \d_scrn_bar_distance\interactionbarparameter\c!distance\relax
+ \ifzeropt\d_scrn_bar_width
+ \d_scrn_bar_width1.5\emwidth
+ \fi
+ \doifnothing{\interactionbarparameter\c!height}{\letinteractionbarparameter\c!height\v!broad}%
+ \doifnothing{\interactionbarparameter\c!depth }{\letinteractionbarparameter\c!depth\zeropoint}%%%
+ \letinteractionbarparameter\c!background\empty
+ \setbox2\hbox{\inheritedinteractionbarframed{\symbol[\interactionparameter\c!symbolset][\v!previouspage]}}%
+ \scratchheight\ht2 % needed because we default to nothing
+ \letinteractionbarparameter\c!strut\v!no
+ % \letinteractionparameter\c!width\zeropoint
+ \scratchcounterone\zerocount % new, was 1
+ \processallactionsinset
+ [#list]
+ [ \v!page=>\advance\scratchcounterone\plusfour,
+ \v!subpage=>\advance\scratchcounterone\plusfour,
+ \s!unknown=>\advance\scratchcounterone\plusone]%
+ \ifzeropt\d_scrn_bar_width
+ \scratchdimenone\dimexpr2\emwidth+\d_scrn_bar_distance\relax
+ \scratchdimentwo\dimexpr\scratchcounterone\scratchdimenone-\d_scrn_bar_distance\relax
+ \else
+ \scratchdimenone\d_scrn_bar_width
+ \scratchdimentwo\dimexpr\scratchcounterone\d_scrn_bar_distance-\d_scrn_bar_distance\relax
+ \advance\scratchdimenone -\scratchdimentwo
+ \divide\scratchdimenone \scratchcounterone
+ \scratchdimentwo\d_scrn_bar_width
+ \fi
+ \hbox to \scratchdimentwo
+ {\setnostrut
+ \startsymbolset[\interactionparameter\c!symbolset]%
+ \setupbuttons
+ [#settings,%
+ \c!height=\the\scratchheight,%
+ \c!width=\the\scratchdimenone]%
+ \processallactionsinset
+ [#list]
+ [ \v!page=>\scrn_bar_goto\v!firstpage
+ \scrn_bar_goto\v!nextpage
+ \scrn_bar_goto\v!previouspage
+ \scrn_bar_goto\v!lastpage,
+ \v!subpage=>\scrn_bar_goto\v!firstsubpage
+ \scrn_bar_goto\v!nextsubpage
+ \scrn_bar_goto\v!previoussubpage
+ \scrn_bar_goto\v!lastsubpage,
+ \s!unknown=>\scrn_bar_goto\commalistelement]%
+ \unskip
+ \stopsymbolset}%
+ \endgroup}
+
+\def\scrn_bar_goto#action%
+ {\button{\symbol[#action]}[#action]\hss}
+
+% todo: this will be \letblackruleparameter\c!width\scratchdimenone (faster)
+% todo: make these setups
+
+\def\scrn_bar_alternative_a
+ {\d_scrn_bar_width \interactionbarparameter\c!width
+ \d_scrn_bar_distance\interactionbarparameter\c!distance
+ \d_scrn_bar_height \interactionbarparameter\c!height
+ \d_scrn_bar_depth \interactionbarparameter\c!depth
+ \noindent\hbox to \d_scrn_bar_width \bgroup
+ \dontcomplain
+ \setupblackrules[\c!height=\v!max,\c!depth=\v!max]%
+ \scratchdimentwo\dimexpr\d_scrn_bar_width-4\emwidth\relax
+ \processaction
+ [\interactionbarparameter\c!step]
+ [ \v!small=>\scratchcounter 20,
+ \v!medium=>\scratchcounter 10,
+ \v!big=>\scratchcounter 5,
+ \s!unknown=>\scratchcounter 10]%
+ \scratchdimenone\dimexpr\scratchdimentwo/\scratchcounter\relax
+ \setupblackrules[\c!width=\scratchdimenone]%
+ \setbox\scratchbox\hbox to \d_scrn_bar_width
+ {\hskip2\emwidth
+ \setbox\scratchbox\hpack{\blackrule[\c!color=\interactionbarparameter\c!backgroundcolor]}%
+ \dorecurse\scratchcounter
+ {\hss\normalexpanded{\directgotodumbbox{\copy\scratchbox}[page(\the\numexpr\recurselevel*\lastpage/\scratchcounter\relax)]}}%
+ \hss
+ \hskip2\emwidth}%
+ \wd\scratchbox\zeropoint
+ \box \scratchbox
+ \setupblackrules[\c!width=\emwidth]%
+ \normalexpanded{\directgotospecbox\noexpand\interactionbarparameter{\blackrule}[\v!firstpage]}%
+ \hskip\emwidth
+ \ifnum\realpageno>\plusone
+ \hskip\zeropoint\s!plus\numexpr\realpageno-\plustwo\relax \s!sp\relax % cm gives overflow
+ \normalexpanded{\directgotospecbox\noexpand\interactionbarparameter{\blackrule}[\v!previouspage)]}%
+ \fi
+ \normalexpanded{\directgotospecbox\noexpand\interactionbarparameter{\blackrule}[page(\number\realpageno)]}% todo: \v!currentpage
+ \ifnum\realpageno<\lastpage\relax
+ \normalexpanded{\directgotospecbox\noexpand\interactionbarparameter{\blackrule}[\v!nextpage]}%
+ \hskip\zeropoint\s!plus\numexpr\lastpage-\realpageno-\plusone\relax \s!sp\relax % cm gives overflow
+ \fi
+ \hskip\emwidth
+ \normalexpanded{\directgotospecbox\noexpand\interactionbarparameter{\blackrule}[\v!lastpage]}%
+ \egroup}
+
+\def\scrn_bar_alternative_b
+ {\ifnum\lastpage>\firstpage\relax
+ \interactionbuttons[\v!firstpage,\v!previouspage,\v!nextpage,\v!lastpage]%
+ \fi}
+
+\def\scrn_bar_alternative_c
+ {\ifnum\lastpage>\plusone
+ \d_scrn_bar_width\interactionbarparameter\c!width
+ \hbox to \d_scrn_bar_width
+ {\setupblackrules[\c!height=\interactionbarparameter\c!height,\c!depth=\interactionbarparameter\c!depth,\c!width=\emwidth]%
+ \scratchdimen\dimexpr(\d_scrn_bar_width-4\emwidth)/\numexpr\lastpage+\minusone\relax\relax
+ \scratchdimenone\numexpr\realpageno+\minusone\relax\scratchdimen
+ \scratchdimentwo\numexpr\lastpage-\realpageno\relax\scratchdimen
+ \directgotospecbox\interactionbarparameter{\blackrule}[\v!firstpage]%
+ \hss
+ \directgotospecbox\interactionbarparameter{\blackrule[\c!width=\scratchdimenone]}[\v!previouspage]%
+ \blackrule[\c!color=\interactionbarparameter\c!contrastcolor]%
+ \directgotospecbox\interactionbarparameter{\blackrule[\c!width=\scratchdimentwo]}[\v!nextpage]%
+ \hss
+ \directgotospecbox\interactionbarparameter{\blackrule}[\v!lastpage]}%
+ \fi}
+
+\protected\def\scrn_bar_goto_a#whereto%
+ {\symbol[\ifcase#whereto\v!previous\or\v!somewhere\or\v!next\fi]}
+
+\protected\def\scrn_bar_goto_b#whereto%
+ {\vrule\s!height\d_scrn_bar_height\s!depth\d_scrn_bar_depth\s!width\scratchdimenone\relax}
+
+\protected\def\scrn_bar_goto_c#whereto%
+ {\symbol[\ifcase#whereto\v!previous\or\v!somewhere\or\v!somewhere\or\v!somewhere\or\v!next\fi}
+
+\protected\def\scrn_bar_goto_d#whereto%
+ {\vrule \s!width\scratchdimenone \ifcase#whereto%
+ \s!height \d_scrn_bar_height \s!depth \d_scrn_bar_depth \or
+ \s!height.5\d_scrn_bar_height \s!depth.5\d_scrn_bar_depth \or
+ \s!height \d_scrn_bar_height \s!depth \d_scrn_bar_depth \or
+ \s!height.5\d_scrn_bar_height \s!depth.5\d_scrn_bar_depth \else
+ \s!height \d_scrn_bar_height \s!depth \d_scrn_bar_depth \fi}
+
+\newconstant\c_scrn_bar_mode
+
+\let\scrn_bar_goto_indeed\relax
+
+\protected\def\scrn_bar_goto_x#command%
+ {\doifelse{\interactionbarparameter\c!symbol}\v!yes
+ {\setupsymbolset[\interactionparameter\c!symbolset]%
+ \let\scrn_bar_goto_indeed\scrn_bar_goto_a}
+ {\let\scrn_bar_goto_indeed\scrn_bar_goto_b}%
+ \dorecurse\nofsubpages
+ %{\scratchcounter\numexpr\recurselevel+\firstsubpage+\minusone\relax
+ {\scratchcounter\therealsubpageno\recurselevel
+ \c_scrn_bar_mode
+ \ifnum\scratchcounter<\realpageno \zerocount \else
+ \ifnum\scratchcounter=\realpageno \plusone \else
+ \plustwo \fi\fi
+ \normalexpanded{\directgotospecbox\noexpand\interactionbarparameter{\scrn_bar_goto_indeed\c_scrn_bar_mode}[page(\the\scratchcounter)]}%
+ #command}%
+ \unskip}
+
+\def\scrn_bar_alternative_d
+ {\ifnum\nofsubpages>\plusone \doif{\namedcounterparameter\s!subpage\c!state}\v!start{%
+ \d_scrn_bar_width \interactionbarparameter\c!width
+ \d_scrn_bar_distance\interactionbarparameter\c!distance
+ \d_scrn_bar_height \interactionbarparameter\c!height
+ \d_scrn_bar_depth \interactionbarparameter\c!depth
+ \scratchdimenone\d_scrn_bar_width
+ \noindent\hbox{\scrn_bar_goto_x{\hskip\d_scrn_bar_distance}}% \hpack ?
+ }\fi}
+
+\def\scrn_bar_alternative_e
+ {\ifnum\nofsubpages>\plusone \doif{\namedcounterparameter\s!subpage\c!state}\v!start{%
+ \d_scrn_bar_width \interactionbarparameter\c!width
+ \d_scrn_bar_distance\interactionbarparameter\c!distance
+ \d_scrn_bar_height \interactionbarparameter\c!height
+ \d_scrn_bar_depth \interactionbarparameter\c!depth
+ \scratchdimentwo\dimexpr\nofsubpages\d_scrn_bar_distance-\d_scrn_bar_distance\relax % (n-1)
+ \scratchdimenone\dimexpr(\d_scrn_bar_width-\scratchdimentwo)/\nofsubpages\relax
+ \ifdim\scratchdimenone<\d_scrn_bar_distance
+ \scrn_bar_alternative_f
+ \else
+ \noindent\hbox to \d_scrn_bar_width{\scrn_bar_goto_x{\hss}\unskip}% \hpack ?
+ \fi
+ }\fi}
+
+\def\scrn_bar_alternative_f
+ {\ifnum\nofsubpages>\plusone \doif{\namedcounterparameter\s!subpage\c!state}\v!start{%
+ \d_scrn_bar_width \interactionbarparameter\c!width
+ \d_scrn_bar_distance\interactionbarparameter\c!distance
+ \d_scrn_bar_height \interactionbarparameter\c!height
+ \d_scrn_bar_depth \interactionbarparameter\c!depth
+ \noindent \hbox to \d_scrn_bar_width \bgroup
+ \doloop
+ {\scratchcounterthree\numexpr(\nofsubpages/\recurselevel)+\plusone\relax % rounding
+ \scratchdimentwo\d_scrn_bar_distance
+ \multiply\scratchdimentwo \scratchcounterthree
+ \advance\scratchdimentwo -\d_scrn_bar_distance
+ \scratchdimenone\d_scrn_bar_width
+ \advance\scratchdimenone -\scratchdimentwo
+ \divide\scratchdimenone \scratchcounterthree
+ \ifdim\scratchdimenone<\d_scrn_bar_distance\else
+ \scratchcountertwo\recurselevel
+ \exitloop
+ \fi}%
+ \ifnum\scratchcounterthree>\plusone
+ % this is not that well tested
+ \advance\scratchcounterthree \minustwo
+ \scratchdimenone-\d_scrn_bar_distance
+ \scratchdimenone\scratchcounterthree\scratchdimenone
+ \advance\scratchdimenone \d_scrn_bar_width
+ \advance\scratchcounterthree \plusone
+ \divide\scratchdimenone \scratchcounterthree
+ \fi
+ \doifelse{\interactionbarparameter\c!symbol}\v!yes
+ {\setupsymbolset[\interactionparameter\c!symbolset]%
+ \let\scrn_bar_goto_indeed\scrn_bar_goto_c}%
+ {\let\scrn_bar_goto_indeed\scrn_bar_goto_d}%
+ \scratchcounterthree\numexpr\realpageno-\plustwo\relax
+ \scratchcounterfour\numexpr\realpageno+\plustwo\relax
+ \ifnum\scratchcounterthree<\plusone \scratchcounterthree\plusone \fi
+ \scratchcounterfive\zerocount
+ \dostepwiserecurse\firstsubpage\lastsubpage\plusone
+ {\donefalse
+ \advance\scratchcounterfive \plusone
+ \ifnum\recurselevel=\firstsubpage\relax \donetrue \fi
+ \ifnum\recurselevel=\lastsubpage \relax \donetrue \fi
+ \scratchcountersix\therealsubpageno\recurselevel\relax
+ \c_scrn_bar_mode
+ \ifdone
+ \ifnum\scratchcountersix<\realpageno
+ \zerocount
+ \orelse\ifnum\scratchcountersix>\realpageno
+ \plustwo
+ \else
+ \plusfour
+ \fi
+ \else
+ \ifnum\scratchcounterfive=\scratchcountertwo
+ \ifnum\scratchcountersix<\realpageno
+ \plusone
+ \orelse\ifnum\scratchcountersix>\realpageno
+ \plusthree
+ \else
+ \plustwo
+ \fi
+ \else
+ \minusone
+ \fi
+ \fi
+ \ifnum\c_scrn_bar_mode<\zerocount\else
+ \normalexpanded{\directgotospecbox\noexpand\interactionbarparameter{\scrn_bar_goto_indeed\c_scrn_bar_mode}[realpage(\the\scratchcountersix)]}%
+ \hss
+ \scratchcounterfive\zerocount
+ \fi}%
+ \unskip
+ \egroup
+ }\fi}
+
+\def\scrn_bar_alternative_g
+ {\ifnum\lastsubpage>\firstsubpage\relax % no test for state?
+ \interactionbuttons[\v!firstsubpage,\v!previoussubpage,\v!nextsubpage,\v!lastsubpage]%
+ \fi}
+
+\setupinteractionbar
+ [\c!state=\v!start,
+ \c!alternative=a,
+ \c!symbol=\v!no,
+ \c!width=10\emwidth,
+ \c!height=.5\emwidth,
+ \c!depth=\zeropoint,
+ \c!distance=.5\emwidth,
+ \c!step=\v!medium,
+ \c!foregroundcolor=\interactionbarparameter\c!color,
+ \c!foregroundstyle=\interactionbarparameter\c!style,
+ \c!color=\interactionparameter\c!color,
+ \c!contrastcolor=\interactionparameter\c!contrastcolor,
+ \c!style=,
+ \c!frame=\v!on,
+ \c!background=color,
+ \c!backgroundcolor=gray,
+ \c!samepage=\v!yes]
+
+\defineinteractionbar[a][\c!command=\scrn_bar_alternative_a]
+\defineinteractionbar[b][\c!command=\scrn_bar_alternative_b,\c!height=\v!broad]
+\defineinteractionbar[c][\c!command=\scrn_bar_alternative_c,\c!height=\v!max,\c!depth=\v!max]
+\defineinteractionbar[d][\c!command=\scrn_bar_alternative_d,\c!width=.5\emwidth]
+\defineinteractionbar[e][\c!command=\scrn_bar_alternative_e]
+\defineinteractionbar[f][\c!command=\scrn_bar_alternative_f]
+\defineinteractionbar[g][\c!command=\scrn_bar_alternative_g,\c!height=\v!broad]
+
+\protect \endinput