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%D \module
%D [ file=spac-grd,
%D version=2009.10.16, % 1998.03.10, was core-grd.tex
%D title=\CONTEXT\ Spacing Macros,
%D subtitle=Grid Snapping,
%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.
%D This module will be merged intio spac-ver.mkiv.
\writestatus{loading}{ConTeXt Spacing Macros / Grid Snapping}
% buff-ver.mkiv: halfline spacing
% strc-mat.mkiv: configure math grid (new code needed)
% page-one.mkiv: to be checked
% page-mul.mkiv: to be checked and redone
% page-sid.mkiv: to be checked
% page-set.mkiv: to be checked
% strc-not.mkiv: to be checked
% strc-ren.mkiv: to be checked
% strc-flt.mkiv: to be checked (captions, probably top/bottom)
% core-mis.mkiv: to be checked (placement, probbaly harmless)
\unprotect
%D Helpers:
\let\poplastnode\relax
\def\pushlastnode
{\ifdim\lastskip=\zeropoint
\ifnum\lastpenalty=\zerocount
\ifnum\lastkern=\zerocount
\let\poplastnode\relax
\else
\edef\poplastnode{\kern\the\lastkern\relax}\kern-\lastkern % untested
\fi
\else
\edef\poplastnode{\penalty\the\lastpenalty\relax}\nobreak % untested
\fi
\else
\edef\poplastnode{\vskip\the\lastskip\relax}\vskip-\lastskip % \removelastskip
\fi}
%D Moved from supp-box:
%D \macros
%D {startbaselinecorrection,baselinecorrection,
%D showbaselinecorrection,offbaselinecorrection}
%D
%D Spacing around ruled boxes can get pretty messed up. The
%D next macro tries as good as possible to fix this.
%D
%D \startbuffer[1]
%D \startbaselinecorrection
%D \ruledhbox{Rule Brittanica}
%D \stopbaselinecorrection
%D \stopbuffer
%D
%D \typebuffer[1]
%D
%D The macros put some white space around the box:
%D
%D \getbuffer[1]
%D
%D A simple alternative is \type {\baselinecorrection}, which
%D only looks at the previous line.
%D
%D \startbuffer[2]
%D \baselinecorrection
%D \ruledhbox{Rule Brittanica}
%D \baselinecorrection
%D \stopbuffer
%D
%D \typebuffer[2]
%D
%D This time the last preceding line gets a correction,%
%D dependant on the depth.
%D
%D \getbuffer[2]
%D
%D One can make the correction visible by saying \type
%D {\showbaselinecorrection}. Part of the correction is
%D calculated from the dimensions of a~(. One can disble the
%D correction by calling \type {\offbaselinecorrection}.
%D
%D When visualize the first example looks like:
%D
%D {\showbaselinecorrection\getbuffer[1]}
%D
%D and the second one comes out as:
%D
%D {\showbaselinecorrection\getbuffer[2]}
% \definecolor[GridLineColor][red]
% \definecolor[GridTextColor][blue]
\newdimen\d_spac_lines_correction_before
\newdimen\d_spac_lines_correction_after
\newbox \b_spac_lines_correction_before
\newbox \b_spac_lines_correction_after
\def\spac_lines_initialize_corrections
{\setbox\b_spac_lines_correction_before\hbox{\setstrut\strut}%
\setbox\b_spac_lines_correction_after \hbox{(}%
\d_spac_lines_correction_before\dimexpr\ht\b_spac_lines_correction_before-\ht\b_spac_lines_correction_after\relax
\d_spac_lines_correction_after \dimexpr\dp\b_spac_lines_correction_before-\dp\b_spac_lines_correction_after\relax
\ifdim\d_spac_lines_correction_before<\zeropoint\d_spac_lines_correction_before\zeropoint\fi
\ifdim\d_spac_lines_correction_after <\zeropoint\d_spac_lines_correction_after \zeropoint\fi}
%unexpanded\def\dotopbaselinecorrection{\kern\d_spac_lines_correction_before}
%unexpanded\def\dobotbaselinecorrection{\kern\d_spac_lines_correction_after }
% experiment, todo: proper mkiv mechanism
%
% \input ward \par
% \startframedtext test \stopframedtext
% \input ward \par
% \startlinecorrection \framed{xxx} \stoplinecorrection
% \input ward \par
%
% \setupwhitespace[big]
%
% \input ward \par
% \startframedtext test \stopframedtext
% \input ward \par
% \startlinecorrection \framed{xxx} \stoplinecorrection
% \input ward \par
\unexpanded\def\dotopbaselinecorrection{\expandafter\blank\expandafter[\the\d_spac_lines_correction_before]}
\unexpanded\def\dobotbaselinecorrection{\expandafter\blank\expandafter[\the\d_spac_lines_correction_after ]}
\def\showbaselinecorrection
{\def\dobaselinecorrection % visualization is not watertight!
{\bgroup
\ifdim\prevdepth>\zeropoint\kern-\prevdepth\fi
\setbox\scratchbox\emptyhbox
\wd\scratchbox\hsize
\dp\scratchbox\strutdp
\nointerlineskip
\forgetall
\ruledvbox{\box\scratchbox}%
\egroup
\prevdepth\strutdp}%
\def\dotopbaselinecorrection
{\hrule\!!height\d_spac_lines_correction_before}%
\def\dobotbaselinecorrection
{\hrule\!!height\d_spac_lines_correction_after}}
\def\dobaselinecorrection % beware, this one is redefined / used locally elsewhere
{\ifdim\prevdepth>\zeropoint\kern-\prevdepth\fi
\kern\strutdp
\prevdepth\strutdp}
\def\baselinecorrection
{\endgraf
\ifvmode
\ifdim\prevdepth<\maxdimen
\ifdim\prevdepth<\zeropoint \else
\ifdim\prevdepth<\strutdepth \relax
\pushlastnode
\dobaselinecorrection
\poplastnode
\fi
\fi
\fi
\fi}
\def\pagebaselinecorrection
{\ifdim\pagegoal<\maxdimen
\ifdim\pagetotal>\lineheight % or \topskip
\scratchdimen\pagetotal
\advance\scratchdimen\lineheight
\ifdim\scratchdimen<\pagegoal
\baselinecorrection
\fi
\fi
\fi}
\unexpanded\def\startbaselinecorrection
{\bgroup
\let\stopbaselinecorrection\egroup
\ifcase\baselinecorrectionmode
\or % normal
\baselinecorrection
\ifvmode
\setbox\scratchbox\vbox\bgroup\ignorespaces
\let\stopbaselinecorrection\donormalstopbaselinecorrection
\fi
\or % off
\or % force
\baselinecorrection
\ifvmode
\setbox\scratchbox\vbox\bgroup\ignorespaces
\let\stopbaselinecorrection\doforcedstopbaselinecorrection
\fi
\fi}
\let\stopbaselinecorrection\relax
\def\donormalstopbaselinecorrection % I have to check columns yet.
{\egroup
\topbaselinecorrection
\box\scratchbox
\botbaselinecorrection
\egroup}
\def\doforcedstopbaselinecorrection % I have to check columns yet.
{\egroup
\forcedtopbaselinecorrection
\box\scratchbox
\forcedbotbaselinecorrection
\egroup}
%D We do a bit more checking than needed. The pageborder check
%D is not needed, but I want to look the visualization as good
%D as possible too.
\setnewconstant\baselinecorrectionmode\plusone
\def\onbaselinecorrection {\baselinecorrectionmode\plusone }
\def\offbaselinecorrection {\baselinecorrectionmode\plustwo }
\def\forcebaselinecorrection{\baselinecorrectionmode\plusthree}
%D \macros
%D {topbaselinecorrection,botbaselinecorrection}
%D
%D The actual top and bottom corrections are implemented as:
\def\topbaselinecorrection
{\ifvmode \ifdim\pagegoal<\maxdimen
\forcedtopbaselinecorrection
\fi \fi}
\def\forcedtopbaselinecorrection
{\ifvmode
\bgroup
\spac_lines_initialize_corrections
\whitespace % no longer ok
\nointerlineskip
\dotopbaselinecorrection
\egroup
\fi}
\def\botbaselinecorrection
{\ifvmode
\bgroup
\spac_lines_initialize_corrections
\dobotbaselinecorrection
\allowbreak % new, otherwise problems when many in a row
\prevdepth\strutdp
\egroup
\fi}
\let\forcedbotbaselinecorrection\botbaselinecorrection
% nointerlineskip
%
% startpacked
% \startlinecorrection \framed{test} \stoplinecorrection
% \startlinecorrection \framed{test} \stoplinecorrection
% \stoppacked
\def\forcedtopbaselinecorrection
{\ifvmode
\bgroup
\spac_lines_initialize_corrections
\vspacing[\v!white]
% \nointerlineskip %
\dotopbaselinecorrection
\egroup
\fi}
\def\dobaselinecorrection
{\ifdim\prevdepth>\zeropoint
\vspacing[\the\dimexpr-\prevdepth+\strutdp\relax]%
\else
\vspacing[\the\dimexpr\strutdp\relax]%
\fi
\prevdepth\strutdp}
\let\normalstartbaselinecorrection\startbaselinecorrection
\unexpanded\def\startbaselinecorrection
{\ifgridsnapping
\snaptogrid[\v!normal]\vbox\bgroup
\let\stopbaselinecorrection\egroup
\else
\normalstartbaselinecorrection
\fi}
\protect \endinput
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