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%D \module
%D [ file=page-flt,
%D version=2010.04,08,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Float Management,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%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 / Float Management}
%D This module has code that previously was in other modules. There is
%D also float related code in \type {strc-flt.mkiv}.
\registerctxluafile{page-flt}{1.001}
\unprotect
%D To be checked and removed
%def\dosavefloatinfo {\showmessage\m!floatblocks2{\the\totalnoffloats}}
\def\doinsertfloatinfo {\showmessage\m!floatblocks4{\the\totalnoffloats}}
\def\dofloatflushedinfo{\showmessage\m!floatblocks3{\the\numexpr\totalnoffloats-\savednoffloats\relax}}
%D Extra float registers.
\newif\ifsomefloatwaiting \somefloatwaitingfalse
\newif\ifroomforfloat \roomforfloattrue
\newif\ifnofloatpermitted \nofloatpermittedfalse
\newif\ifcenterfloatbox \centerfloatboxtrue
\newif\iflocalcenterfloatbox \localcenterfloatboxfalse
\newif\ifglobalcenterfloatbox \globalcenterfloatboxfalse
\newif\ifflushingfloats \flushingfloatsfalse
\newif\ifpackflushedfloats \packflushedfloatstrue % for the moment
\newif\ifpackcolumnfloats \packcolumnfloatstrue
\newcount\totalnoffloats
\newcount\savednoffloats
\newcount\noffloatinserts
\newcount\nofcollectedfloats % communication channel
\newbox \floatlist
\newbox \savedfloatlist
\newbox \floattext
\newdimen\floatwidth
\newdimen\floatheight
\newdimen\floatdepth
\newdimen\floattextwidth
\newdimen\floattextheight
\newbox \floatbox
\newbox \savedfloatbox
%D From now on we manage the float stack at the \LUA\ end instead of packing
%D them in a box and splitting off stacked floats. It's not so much less code
%D but it's cleaner this way. It also opens op some posibilities as we can now
%D more conveniently cary additional information around.
\newtoks \everyfloatscheck
\appendtoks
\ifcase\savednoffloats
\global\somefloatwaitingfalse
\else
\global\somefloatwaitingtrue
\fi
\to \everyfloatscheck
\def\dofloatsflush#1#2%
{\ctxlua{floats.flush("#1",\number#2)}%
\the\everyfloatscheck}
\def\dofloatssave#1%
{\ctxlua{floats.save("#1")}%
\the\everyfloatscheck}
\def\dofloatsresave#1%
{\ctxlua{floats.resave("#1")}%
\the\everyfloatscheck}
\def\dopushsavedfloats
{\ctxlua{floats.push()}%
\the\everyfloatscheck}
\def\dopopsavedfloats
{\ctxlua{floats.pop()}%
\the\everyfloatscheck}
\def\dofloatsgetinfo#1%
{\ctxlua{floats.consult("#1")}}
\def\doifsavedfloatelse#1%
{\ctxlua{commands.doifsavedfloatelse("#1")}}
\def\dofloatscollect#1#2#3%
{\ctxlua{floats.collect("#1",\number\dimexpr#2,\number\dimexpr#3)}}
\def\dofloatsnofstacked#1%
{\ctxlua{floats.thestacked("#1")}}
\def\dofloatsgetvariable#1%
{\ctxlua{floats.thevar("specification")}}
\let\dopushcolumnfloats\dopushsavedfloats
\let\dopopcolumnfloats \dopopsavedfloats
\def\dofloatssavepagefloat#1#2%
{\ctxlua{floats.save("#1", { specification = "#2" })}}
%D The following code is in transition as we don't want to break the
%D current single column, multi column, and columnset mechanism.
%D
%D First we reimplement some helpers.
\def\dogetfloat
{\ifsomefloatwaiting
\dofloatsflush{text}{1}%
\ifcenterfloatbox
\ifdim\wd\globalscratchbox<\hsize
\global\setbox\floatbox\hbox to \hsize{\hss\box\floatbox\hss}%
\else
% retain special alignments
\ifinsidecolumns
\ifdim\wd\floatbox>\makeupwidth
\global\wd\floatbox\makeupwidth
\fi
\fi
\fi
\fi
\else
\global\savednoffloats\zerocount
\global\setbox\floatbox\emptybox
\fi}
\def\dosavefloat
{\dofloatssave{text}%
\nonoindentation} % brrr nonoindentation here
\def\doresavefloat
{\dofloatsresave{text}}
\def\doreversesavefloat
{\dofloatsresave{text}}
\def\doflushsavedfloats % simplified \OTRONEdodoflushfloats
{\doloop
{\ifsomefloatwaiting
\docheckiffloatfits
\ifroomforfloat
\dogetfloat
\doplacefloatbox
\else
\exitloop
\fi
\else
\exitloop
\fi}}
%D Page floats use different stacks.
\newtoks \everybeforeflushedpagefloat
\def\doflushsomepagefloat#1% future releases can do more clever things
{\dofloatsflush{#1}{1}%
\edef\floatspecification{\dofloatsgetvariable{specification}}%
\the\everybeforeflushedpagefloat
\vbox to \textheight
{\doifnotinset\v!high\floatspecification\vfill
\box\floatbox
\doifnotinset\v!low\floatspecification\vfill}%
\vfill\eject}
% \def\doflushpagefloats
% {\doifoddpageelse
% {\ifnum\dofloatsnofstacked{rightpage}>\zerocount
% \doflushsomepagefloat{rightpage}%
% \else\ifnum\dofloatsnofstacked{page}>\zerocount
% \doflushsomepagefloat{page}
% \else\ifnum\dofloatsnofstacked{leftpage}>\zerocount
% \null\vfill\eject
% %\doflushsomepagefloat{leftpage}%
% \fi\fi\fi}
% {\ifnum\dofloatsnofstacked{leftpage}>\zerocount
% \doflushsomepagefloat{leftpage}%
% \else\ifnum\dofloatsnofstacked{page}>\zerocount
% \doflushsomepagefloat{page}
% \else\ifnum\dofloatsnofstacked{rightpage}>\zerocount
% \null\vfill\eject
% %\doflushsomepagefloat{rightpage}%
% \fi\fi\fi}}
\def\doflushpagefloats
{\edef\checkedpagefloat{\ctxlua{floats.thecheckedpagefloat()}}% (true) for packed
\ifx\checkedpagefloat\empty
% nothing
\else\ifx\checkedpagefloat\v!empty
\null\vfill\eject
\else
\doflushsomepagefloat\checkedpagefloat
\fi\fi}
\def\uncenteredfloatbox
{\ifcenterfloatbox
\ifhbox\floatbox\relax % remove centering
\ifdim\wd\floatbox=\hsize
\ifhbox\floatbox
\setbox\scratchbox\hbox
{\unhbox\floatbox
\unskip\unskip
\global\setbox\globalscratchbox\lastbox}%
\box\globalscratchbox
\else
\box\floatbox
\fi
\else
\box\floatbox
\fi
\else
\box\floatbox
\fi
\else
\box\floatbox
\fi}
\ifdefined\doflushfloats\else \let\doflushfloats\relax \fi
\ifdefined\flushfloatbox\else \let\flushfloatbox\relax \fi
% temp hack, needed to prevent floatbox being forgotten during
% output, this will change to using another box for flushing
%
% \dorecurse{700}{text } \placefigure[top][]{First} {\framed{bla 1}}
% \placefigure[top][]{Second}{\framed{bla 2}}
% \dorecurse {40}{text } \placefigure[top][]{Third} {\framed{bla 3}}
\newbox\savedfloatbox
\appendtoks
\global\setbox\savedfloatbox\box\floatbox
\to \everybeforeoutput
\appendtoks
\global\setbox\floatbox\box\savedfloatbox
\to \everyafteroutput
\protect \endinput
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