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+%D \module
+%D [ file=page-mis,
+%D version=2008.11.17, % was part of page-flt.tex / 2000.10.20
+%D title=\CONTEXT\ Page Macros,
+%D subtitle=Misc Float Things,
+%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 Page Macros / Misc Float Things}
+
+\unprotect
+
+\newif\ifmargeblokken
+
+\def\dosetupmarginblocks[#1]%
+ {\getparameters[\??mb][#1]%
+ \doifelse\@@mbstate\v!start
+ {\showmessage\m!layouts4\empty
+ \margeblokkentrue
+ \let\somenextfloat\dosomenextfloat
+ \let\startmarginblock\dostartmarginblock
+ \let\stopmarginblock\dostopmarginblock}%
+ {\showmessage\m!layouts5\empty
+ \margeblokkenfalse
+ \def\somenextfloat[##1]%
+ {\someelsefloat[##1,\v!here]}%
+ \let\startmarginblock\dontstartmargeblok
+ \let\stopmarginblock\dontstopmargeblok}}
+
+\def\setupmarginblocks
+ {\dosingleargument\dosetupmarginblocks}
+
+\newbox\marginbox
+
+\def\dosomenextfloat[#1]%
+ {\global\setbox\marginbox\vbox
+ {\hsize\@@mbwidth
+ \unvcopy\marginbox
+ \ifvoid\marginbox\else\expandafter\@@mbinbetween\fi
+ \box\floatbox\filbreak}%
+ \ifdim\ht\marginbox>\textheight
+ \dosavefloatinfo
+ \else
+ \doinsertfloatinfo
+ \fi}
+
+\newbox\preparedmarginbox
+
+\def\reshapemargin
+ {\ifdim\ht\preparedmarginbox>\zeropoint
+ \beginofshapebox
+ \unvbox\preparedmarginbox
+ \endofshapebox
+ \reshapebox
+ {\box\shapebox}%
+ \setbox\preparedmarginbox\vbox to \textheight
+ {\@@mbtop
+ \flushshapebox
+ \@@mbbottom}%
+ \fi}
+
+\def\plaatsrechtermargeblok
+ {\hskip\rightmarginwidth}
+
+\def\plaatslinkermargeblok
+ {\hskip\leftmarginwidth}
+
+\def\checkmargeblokken
+ {\ifvoid\marginbox\else\docheckmargeblokken\fi}
+
+\def\docheckmargeblokken % erg inefficient
+ {\setbox\preparedmarginbox\vbox
+ {\forgetall
+ \splittopskip\topskip
+ \ifvoid\marginbox\else
+ \ifdim\ht\marginbox>\textheight
+ \vsplit\marginbox to \textheight
+ \else
+ \unvbox\marginbox
+ \fi
+ \fi}%
+ \reshapemargin
+ \setbox\preparedmarginbox\vbox
+ {\@@mbbefore\box\preparedmarginbox\@@mbafter}%
+ \def\rightmarginbox
+ {\def\plaatsrechtermargeblok
+ {\setbox\preparedmarginbox\hbox to \rightmarginwidth
+ {\@@mbleft\box\preparedmarginbox\@@mbright}%
+ \vsmashbox\preparedmarginbox
+ \box\preparedmarginbox}}%
+ \def\leftmarginbox
+ {\def\plaatslinkermargeblok
+ {\setbox\preparedmarginbox\hbox to \leftmarginwidth
+ {\@@mbright\box\preparedmarginbox\@@mbleft}%
+ \vsmashbox\preparedmarginbox
+ \box\preparedmarginbox}}%
+ \processaction % traag
+ [\@@mblocation]
+ [ \v!inmargin=>\doifbothsidesoverruled\rightmarginbox\rightmarginbox\leftmarginbox,
+ \v!middle=>\doifbothsidesoverruled\rightmarginbox\leftmarginbox\rightmarginbox,
+ \v!left=>\leftmarginbox,
+ \v!right=>\rightmarginbox,
+ \s!unknown=>\setbox\preparedmarginbox\hbox{}]}
+
+\def\dostartmarginblock % 2 maal \vbox ivm \unvbox elders
+ {\global\setbox\marginbox\vtop\bgroup\vbox\bgroup
+ \hsize\@@mbwidth
+ \ifvoid\marginbox\else
+ \unvbox\marginbox
+ \@@mbinbetween
+ \fi
+ \setupalign[\@@mbalign]%
+ \dostartattributes\??mb\c!style\c!color{}%
+ \begstrut\ignorespaces}
+
+\def\dostopmarginblock
+ {\unskip\endstrut
+ \dostopattributes
+ \egroup
+ \egroup}
+
+\def\dontstartmargeblok
+ {\@@mbbefore
+ \bgroup
+ \dostartattributes\??mb\c!style\c!color\empty}
+
+\def\dontstopmargeblok
+ {\dostopattributes
+ \egroup
+ \@@mbafter}
+
+\newcounter\nofpostponedblocks
+
+\newif\ifinpostponing
+
+\newevery\everytopofpage\relax
+
+\appendtoks \the\everytopofpage \to\everystarttext
+\appendtoks\global\everytopofpage\emptytoks\to\everystoptext
+
+% \startpostponing [pagenumber] [+pageoffset]
+%
+% \startpostponing[2]
+% PAGE 2 \blank
+% \stoppostponing
+%
+% \startpostponing[+1]
+% PAGE +1 \blank
+% \stoppostponing
+%
+% \startpostponing[+2]
+% PAGE +2 \blank
+% \stoppostponing
+%
+% \starttext \dorecurse{4}{\input tufte \page} \stoptext
+
+\newtoks \postponedpageblocks
+\newcounter\nofpostponedpageblocks
+
+% \ifinpostponing: handhaven, want gebruikt in stijlen ! ! ! ! !
+
+\def\flushpagefloats
+ {\doifoddpageelse
+ {\ifvoid\collectedleftpagefloats
+ \ifvoid\collectedrightpagefloats\else
+ \unvbox\collectedrightpagefloats
+ \page
+ %\the\everytopofpage
+ \fi
+ \fi}
+ {\ifvoid\collectedleftpagefloats\else
+ \unvbox\collectedleftpagefloats
+ \page
+ %\the\everytopofpage
+ \fi
+ \ifvoid\collectedrightpagefloats\else
+ \unvbox\collectedrightpagefloats
+ \page
+ %\the\everytopofpage
+ \fi}%
+ \ifvoid\collectedpagefloats\else
+ % message
+ \unvbox\collectedpagefloats
+ \fi}
+
+% \def\flushrestfloats
+% {\doif{\floatsharedparameter\c!cache}\v!no\doflushfloats}
+
+% \let\flushrestfloats\relax
+
+\def\dopostponeblock
+ {\bgroup % new may 2004
+ \setsystemmode\v!postponing % new may 2004
+ \the\everytopofpage
+ %\flushrestfloats
+ \flushpagefloats
+ \donefalse
+ \ifinpostponing \else
+ \ifcase\nofpostponedblocks \else \donetrue \fi
+ \ifcase\nofpostponedpageblocks \else \donetrue \fi
+ \fi
+ \ifdone
+ \bgroup % we need the color/font switch, else problems inside split verbatim
+ \setnormalcatcodes % postponing in verbatim
+ \pushpostponedpagecolor
+ \restoreglobalbodyfont % The \nof-test is
+ \global\pagetotal\zeropoint % recently added and
+ \global\inpostponingtrue % definitely needed else
+ \the\postponedpageblocks % we can loose or disorder
+ \dorecurse\nofpostponedblocks % floats; anyhow, this
+ {\getbuffer[pbuf-\recurselevel]}% % mechanism is still
+ \doflushfloats % new but potential dangerous % suboptimal and needs a
+ \doglobal\newcounter\nofpostponedblocks % proper analysis
+ \global\inpostponingfalse
+ \poppostponedpagecolor
+ \egroup
+ \fi
+ \egroup} % new may 2004
+
+\def\getpostponedblock#1#2%
+ {\doif{#1}\realfolio{\getbuffer[rbuf-#2]}} % no \ifnum, avoid \fi
+
+% beware, \dosingleempty conflicts with buffers (feeds back the \par)
+
+\setvalue{\e!start\v!postponing}%
+ {\bgroup
+ \obeylines
+ \doifnextoptionalelse{\egroup\nodostartpostponing}{\egroup\dodostartpostponing}}
+
+\def\nodostartpostponing[#1]%
+ {\doglobal\increment\nofpostponedpageblocks
+ \bgroup % a little bit of misusing grouping
+ \doifinstring{+}{#1}\advance \realpageno#1\relax % ugly but efficient
+ \doglobal\appendetoks\noexpand\getpostponedblock
+ {\realfolio}{\nofpostponedpageblocks}\to\postponedpageblocks
+ \egroup
+ \showmessage\m!layouts3\nofpostponedpageblocks
+ \dostartbuffer[rbuf-\nofpostponedpageblocks]%
+ [\e!start\v!postponing][\e!stop\v!postponing]}
+
+\def\dodostartpostponing
+ {\doglobal\increment\nofpostponedblocks
+ \showmessage\m!layouts3\nofpostponedblocks
+ \expanded{\dostartbuffer[pbuf-\nofpostponedblocks][\e!start\v!postponing][\e!stop\v!postponing]}}
+
+% Setups:
+
+\setupmarginblocks
+ [\c!state=\v!start,
+ \c!location=\v!inmargin,
+ \c!width=\rightmarginwidth,
+ \c!style=,
+ \c!color=,
+ \c!align=,
+ \c!left=,
+ \c!right=,
+ \c!top=,
+ \c!inbetween=\blank,
+ \c!bottom=\vfill,
+ \c!before=,
+ \c!after=]
+
+\protect \endinput