stable 2010-05-24 13:10

1 files changed, 784 insertions, 0 deletions

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+%D \module
+%D   [       file=page-txt, % copied from main-001,
+%D        version=1997.03.31,
+%D          title=\CONTEXT\ Page Macros,
+%D       subtitle=Texts,
+%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.
+
+% \setuplayouttext in manual
+
+\writestatus{loading}{ConTeXt Page Macros / Texts}
+
+\unprotect
+
+\let\dodummypageskip\gobbleoneargument % obsolete
+
+%D Interfacing between this and other modules is handled by
+%D the following macros. The current state of a text line
+%D (header, footer, etc.) is checked by:
+%D
+%D \starttyping
+%D \resetlayouttextlines
+%D \stoptyping
+%D
+%D The main text box is finished by the following macro:
+%D
+%D \starttyping
+%D \getmainbox <box> <\vbox|\unvbox>
+%D \stoptyping
+%D
+%D The text lines are collected with:
+%D
+%D \starttyping
+%D \gettextboxes
+%D \stoptyping
+%D
+%D It is possible to extens the default content of the text
+%D areas by appending content to the following token list
+%D registers:
+
+\newtoks\toptextcontent     \newtoks\leftedgetextcontent
+\newtoks\headertextcontent  \newtoks\leftmargintextcontent
+\newtoks\footertextcontent  \newtoks\rightmargintextcontent
+\newtoks\bottomtextcontent  \newtoks\rightedgetextcontent
+
+\newtoks\texttextcontent
+
+%D \macros
+%D  {setuptop, setupheader, setuptext,
+%D   setupfooter, setupbottom}
+%D
+%D The macros in this module sometimes look a bit more complicated
+%D than needed, which is a direct result of the fact that their
+%D ancestors are quite old and upward compatibility is a must.
+%D
+%D \showsetup{setuptop}
+%D \showsetup{setupheader}
+%D \showsetup{setuptext}
+%D \showsetup{setupfooter}
+%D \showsetup{setupbottom}
+
+\def\setuplayouttext
+  {\dotripleempty\dosetuplayouttext}
+
+\def\dosetuplayouttext[#1][#2][#3]% beware, non global
+  {\ifthirdargument
+     \getparameters[\??tk#1#2][#3]%
+   \else
+    %\getparameters[\??tk#1\v!text][#2]%
+     \edef\previoustextstate{\getvalue{\??tk#1\c!state}}%
+     \getparameters[\??tk#1][#2]%
+     \doifnotvalue{\??tk#1\c!state}\previoustextstate
+       {%\checkcurrentlayout % no
+        \edef\currenttextstate{\getvalue{\??tk#1\c!state}}%
+        % speed optimization (calculating backgrounds takes time)
+        \doifcommon{\previoustextstate,\currenttextstate}{\v!high,\v!none}
+          {\calculatevsizes
+           \recalculatebackgrounds
+           \recalculatelogos}}%
+   \fi}
+
+\def\setuptop    {\dotripleempty\dosetuplayouttext[\v!top]}
+\def\setupheader {\dotripleempty\dosetuplayouttext[\v!header]}
+\def\setuptext   {\dotripleempty\dosetuplayouttext[\v!text]}
+\def\setupfooter {\dotripleempty\dosetuplayouttext[\v!footer]}
+\def\setupbottom {\dotripleempty\dosetuplayouttext[\v!bottom]}
+
+%D \macros
+%D  {noheaderandfooterlines,notopandbottomlines}
+%D
+%D Although not really needed, the following shortcuts
+%D sometimes come in handy.
+%D
+%D \showsetup{noheaderandfooterlines}
+%D \showsetup{notopandbottomlines}
+
+\def\noheaderandfooterlines
+  {\setupheader[\c!state=\v!empty]%
+   \setupfooter[\c!state=\v!empty]}
+
+\def\notopandbottomlines
+  {\setuptop   [\c!state=\v!empty]%
+   \setupbottom[\c!state=\v!empty]}
+
+%D \macros
+%D  {setuptoptexts, setupheadertexts, setuptexttexts,
+%D   setupfootertexts, setupbottomtexts}
+%D
+%D The next macros take one or more arguments. The exact setup
+%D depends on the number of arguments. Although not that
+%D intuitive, the current scheme evolved out of the original.
+%D When margin and edge texts as well as middle texts showed
+%D up, the current odd|/|even scheme surfaced.
+%D
+%D \showsetup{setuptoptexts}
+%D \showsetup{setupheadertexts}
+%D \showsetup{setuptexttexts}
+%D \showsetup{setupfootertexts}
+%D \showsetup{setupbottomtexts}
+
+\def\setuptoptexts    {\dosixtupleempty\dosetuptexts[\v!top]}
+\def\setupheadertexts {\dosixtupleempty\dosetuptexts[\v!header]}
+\def\setuptexttexts   {\dosixtupleempty\dosetuptexts[\v!text]}
+\def\setupfootertexts {\dosixtupleempty\dosetuptexts[\v!footer ]}
+\def\setupbottomtexts {\dosixtupleempty\dosetuptexts[\v!bottom]}
+
+%D The left, right and center variables can also be set
+%D directly using the previously discussed macros.
+
+\def\dosetuptexts[#1][#2][#3][#4][#5][#6]%
+  {\ifsixthargument
+     \setvalue{\??tk#1#2\c!lefttext}%
+       {\dodoubletexts{\??tk#1}{#2}%
+          {\c!leftstyle \c!leftcolor \c!leftwidth }{#3}%
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#6}}%
+     \setvalue{\??tk#1#2\c!righttext}%
+       {\dodoubletexts{\??tk#1}{#2}%
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#4}%
+          {\c!leftstyle \c!leftcolor \c!leftwidth }{#5}}%
+   \else\iffifthargument
+     \setvalue{\??tk#1\v!text\c!lefttext}%
+       {\dodoubletexts{\??tk#1}\v!text
+          {\c!leftstyle \c!leftcolor \c!leftwidth }{#2}%
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#5}}%
+     \setvalue{\??tk#1\v!text\c!righttext}%
+       {\dodoubletexts{\??tk#1}\v!text
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#3}%
+          {\c!leftstyle \c!leftcolor \c!leftwidth }{#4}}%
+   \else\iffourthargument
+     \setvalue{\??tk#1#2\c!lefttext}%
+       {\dodoubletexts{\??tk#1}{#2}
+          {\c!leftstyle\c!leftcolor\c!leftwidth}{#3}%
+          {\c!leftstyle\c!leftcolor\c!leftwidth}{#3}}%
+     \setvalue{\??tk#1#2\c!righttext}%
+       {\dodoubletexts{\??tk#1}{#2}
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#4}%
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#4}}%
+   \else\ifthirdargument
+     \setvalue{\??tk#1\v!text\c!lefttext}%
+       {\dodoubletexts{\??tk#1}\v!text
+          {\c!leftstyle\c!leftcolor\c!leftwidth}{#2}%
+          {\c!leftstyle\c!leftcolor\c!leftwidth}{#2}}%
+     \setvalue{\??tk#1\v!text\c!righttext}%
+       {\dodoubletexts{\??tk#1}\v!text
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#3}%
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#3}}%
+   \else\ifsecondargument % new
+     \letvalue{\??tk#1\v!text\c!lefttext }\empty
+     \letvalue{\??tk#1\v!text\c!righttext}\empty
+     \setvalue{\??tk#1\v!text\c!middletext }%
+       {\dosingletexts{\??tk#1}\v!text\c!style\c!color\c!width{#2}}%
+   \else
+     \dosixtupleempty\dosetuptexts[#1][\v!text][][][][]%
+     \dosixtupleempty\dosetuptexts[#1][\v!margin][][][][]%
+     \dosixtupleempty\dosetuptexts[#1][\v!edge ][][][][]%
+   \fi\fi\fi\fi\fi}
+
+%D Left and right texts are swapped on odd and even pages, but
+%D only when double sided typesetting is enabled.
+
+\def\dodoubletexts#1#2#3#4#5#6%
+  {\doifoddpageelse
+     {\dosingletexts{#1}{#2}#3{#4}}  % #3 => provides three arguments
+     {\dosingletexts{#1}{#2}#5{#6}}} % #5 => provides three arguments
+
+%D The next macro will be cleaned up amd made less messy and
+%D dependent.
+
+\def\placetextlinestrut#1%
+  {\doifvalue{#1\c!strut}\v!yes{\setstrut\strut}}
+
+\def\dosingletexts#1#2#3#4#5#6%
+  {\bgroup
+   \defconvertedargument\ascii{#6}%
+   \doifsomething\ascii
+     {\doattributes{#1#2}#3#4%
+        {\placetextlinestrut{#1}% here !
+        %\doifdefinedelse{\??mk\ascii\c!coupling} % brrr
+         \doifelsemarking\ascii
+           {\dolimitatetexts{#1#2#5}{\getmarking[\ascii][\v!first]}}
+           {\ConvertConstantAfter\doifelse\v!pagenumber{#6}
+               \@@plaatspaginanummer
+              {\ConvertConstantAfter\doifelse\v!date{#6}
+                 {\currentdate}
+                 {% #6{}{}{} -> {} needed for macros that look
+                  % ahead, like \uniqueMPgraphic
+                  \opeenregel\dolimitatetexts{#1#2#5}{#6{}{}{}}}}}}}%
+  \egroup}
+
+%D When specified, the texts are automatically limited in
+%D length.
+
+\def\dolimitatetexts#1#2%
+  {\doifelsevaluenothing{#1}{#2}{\limitatetext{#2}{\getvalue{#1}}{\unknown}}}
+
+%D The placement of text is hooked into the token lists
+%D associated to the area at hand.
+
+\appendtoks \placelayouttextline\v!top   \topheight    \to \toptextcontent
+\appendtoks \placelayouttextline\v!header\headerheight \to \headertextcontent
+\appendtoks \placelayouttextline\v!text  \textheight   \to \texttextcontent
+\appendtoks \placelayouttextline\v!footer\footerheight \to \footertextcontent
+\appendtoks \placelayouttextline\v!bottom\bottomheight \to \bottomtextcontent
+
+%D Texts can be disabled, moved up and ignored, depending in
+%D the \type {status} variable. This is handled by the next
+%D couple of macros.
+
+\def\settextlinestatus  #1{\edef\textlinestatus{\csname\??tk#1\c!state\endcsname}}
+%def\resettextlinestatus#1{\letgvalue{\??tk#1\c!state}\v!normal}
+
+\def\resettextlinestatus#1% postpone
+  {\setgvalue{\??tk#1\s!reset}{\letgvalue{\??tk#1\c!state}\v!normal}}
+
+\def\placelayouttextline#1% #2
+  {\settextlinestatus{#1}%
+   \csname\string\placelayouttextline
+     \ifundefined{\string\placelayouttextline\textlinestatus}%
+       \s!unknown
+     \else
+       \textlinestatus
+     \fi
+   \endcsname{#1}} % {#2}
+
+\def\doifelselayouttextline#1% shown or not
+  {\doifinsetelse{\getvalue{\??tk#1\c!state}}{\v!normal,\v!start}}
+
+\def\doifelselayoutsomeline#1% present or not
+  {\edef\!!stringa{\csname\??tk#1\c!state\endcsname}%
+   \ifx\!!stringa\v!none
+     \@EA\secondoftwoarguments
+   \else\ifx\!!stringa\v!high
+     \@EAEAEA\secondoftwoarguments
+   \else
+     \@EAEAEA\firstoftwoarguments
+   \fi\fi}
+
+% \doplacelayouttextline does the actual placement (when a non-zero height)
+
+\newconditional\resyncaftertextline
+
+\setvalue{\string\placelayouttextline\v!normal }{\doplacelayouttextline}
+\setvalue{\string\placelayouttextline          }{\doplacelayouttextline}
+
+\setvalue{\string\placelayouttextline\v!none}#1#2%
+  {}
+
+\setvalue{\string\placelayouttextline\v!high}#1#2%
+  {\global\settrue\resyncaftertextline
+   \resettextlinestatus{#1}}
+
+\setvalue{\string\placelayouttextline\v!empty}#1#2%
+  {\resettextlinestatus{#1}}
+
+\setvalue{\string\placelayouttextline\v!start}#1#2%
+  {\resettextlinestatus{#1}%
+   \doplacelayouttextline{#1}{#2}}
+
+\setvalue{\string\placelayouttextline\v!stop}#1#2%
+  {}
+
+\setvalue{\string\placelayouttextline\v!nomarking}#1#2%
+  {\bgroup
+   \resettextlinestatus{#1}%
+   \let\dogetmarking\nogetmarking
+   \doplacelayouttextline{#1}{#2}%
+   \egroup}
+
+\setvalue{\string\placelayouttextline\s!unknown}#1#2%
+  {\global\settrue\resyncaftertextline
+   \bgroup % new
+   \resettextlinestatus{#1}%
+   \getvalue{\??tk#1\textlinestatus}%
+   \getvalue{\??tk#1\v!text  \textlinestatus}%
+   \getvalue{\??tk#1\v!margin\textlinestatus}%
+   \getvalue{\??tk#1\v!edge  \textlinestatus}%
+   \doplacelayouttextline{#1}{#2}%
+   \egroup}
+
+%D The following macro has to be called after a page
+%D is flushed.
+
+\def\resetlayouttextline#1%
+  {\getvalue {\??tk#1\s!reset}%
+   \letgvalue{\??tk#1\s!reset}\relax}
+
+\def\resetlayouttextlines
+  {\resetlayouttextline\v!top
+   \resetlayouttextline\v!header
+   \resetlayouttextline\v!text
+   \resetlayouttextline\v!footer
+   \resetlayouttextline\v!bottom
+   \ifconditional\resyncaftertextline
+     \doglobal\calculatevsizes
+     \recalculatebackgrounds
+     \recalculatelogos
+     \global\setfalse\resyncaftertextline
+   \fi}
+
+% \settext[header][text][middle][xxx][yyy]
+
+\def\settextcontent
+  {\doquintupleempty\dosettextcontent}
+
+\def\dosettextcontent[#1][#2][#3][#4][#5]% header text middle text/text
+  {\iffifthargument
+     \setvalue{\??tk#1#2\executeifdefined{:\c!text:#3:}\c!middletext}%
+       {\dodoubletexts{\??tk#1}{#2}%
+          {\c!leftstyle \c!leftcolor \c!leftwidth }{#4}%
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#5}}%
+   \else\iffourthargument
+     \setvalue{\??tk#1#2\executeifdefined{:\c!text:#3:}\c!middletext}%
+       {\dodoubletexts{\??tk#1}{#2}%
+          {\c!leftstyle \c!leftcolor \c!leftwidth }{#4}%
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#4}}%
+   \else\ifthirdargument
+     \setvalue{\??tk#1#2\c!middletext}%
+       {\dodoubletexts{\??tk#1}{#2}%
+          {\c!leftstyle \c!leftcolor \c!leftwidth }{#3}%
+          {\c!rightstyle\c!rightcolor\c!rightwidth}{#3}}%
+   \fi\fi\fi}
+
+\def\resettextcontent
+  {\dotripleempty\doresettextcontent}
+
+\def\doresettextcontent[#1][#2][#3]% header text middle
+  {\ifthirdargument
+     \letvalue{\??tk#1#2\executeifdefined{:\c!text:#3:}\c!middletext}\empty
+   \else\ifsecondargument
+     \letvalue{\??tk#1#2\c!lefttext  }\empty
+     \letvalue{\??tk#1#2\c!middletext}\empty
+     \letvalue{\??tk#1#2\c!righttext }\empty
+   \fi\fi}
+
+\let\settext  \settextcontent    % downward compatibility
+\let\resettext\resettextcontent  % downward compatibility
+
+\setvalue{:\c!middle:\c!text:}{\c!middletext}
+\setvalue{:\c!left  :\c!text:}{\c!lefttext  }
+\setvalue{:\c!right :\c!text:}{\c!righttext }
+
+%D The next series of macros is not that easy to read,
+%D because they hook into the main page building macros. By
+%D using token list registers for the text content, we can
+%D easily hook in other code, like menu generators.
+%D
+%D Beware: the token lists are always expanded, also when the
+%D height of an area is zero. This is because reset actions can
+%D be part of them.
+
+\newbox\scratchpagebox
+
+\def\gettextboxes
+  {\setbox\scratchpagebox\vbox
+     {\dontcomplain
+      \calculatereducedvsizes
+      \swapmargins
+      \offinterlineskip
+      \vskip\dimexpr-\topheight-\topdistance\relax
+      \the\toptextcontent
+      \vskip\dimexpr\topheight+\topdistance\relax
+      \the\headertextcontent
+      \vskip\dimexpr\headerheight+\headerdistance\relax
+      \placepositionanchors
+      \vskip-\textheight
+      \the\texttextcontent
+      \vskip\textheight
+      \the\everyendoftextbody
+      \vskip\footerdistance
+      \the\footertextcontent
+      \vskip\dimexpr\footerheight+\bottomdistance\relax
+      \the\bottomtextcontent
+      \vskip\bottomheight
+      \vfilll}%
+  \smashbox\scratchpagebox
+  \box\scratchpagebox}
+
+\def\getmainbox#1#2%
+  {\setbox\scratchpagebox\vbox
+     {\offinterlineskip  % na \paginaletter !
+      \calculatereducedvsizes
+      \calculatehsizes
+      \swapmargins
+      \vskip\dimexpr\headerheight+\headerdistance+\layoutparameter\c!textdistance\relax
+      \hbox to \makeupwidth
+        {\bgroup
+           \swapmargins
+           \goleftonpage
+           \ifdim\leftedgewidth>\zeropoint
+             \the\leftedgetextcontent
+             \hskip\leftedgewidth
+           \fi
+           \hskip\leftedgedistance
+           \ifdim\leftmarginwidth>\zeropoint
+             \the\leftmargintextcontent
+             \hskip\leftmarginwidth
+           \fi
+           \hskip\leftmargindistance
+         \egroup
+         \mkprocesspagecontents{#2}%
+         \settextpagecontent\scratchpagebox{#1}{#2}%
+         \setbox\scratchpagebox\vbox % can we avoid this extra box
+           {\startlayoutcomponent{textbody}{text body}%
+            \box\scratchpagebox
+            \stoplayoutcomponent}%
+         \addtextbackground\scratchpagebox
+         \addtextgridlayer\scratchpagebox
+         \localstarttextcolor % does not work in mkiv
+         \box\scratchpagebox
+         \localstoptextcolor  % so we have to change this
+         \bgroup
+           \hskip\rightmargindistance
+           \ifdim\rightmarginwidth>\zeropoint
+             \the\rightmargintextcontent
+             \hskip\rightmarginwidth
+           \fi
+           \hskip\rightedgedistance
+           \ifdim\rightedgewidth>\zeropoint
+             \the\rightedgetextcontent
+             \hskip\rightedgewidth
+           \fi
+         \egroup
+         \hss}}%
+   \smashbox\scratchpagebox
+   \box\scratchpagebox}
+
+%D The main text area has to be combined with some additional
+%D (tracing) information.
+
+% will be overloaded in page-lyr
+
+\def\settextpagecontent#1#2#3% #2 and #3 will disappear
+  {\setbox#1\hbox to \makeupwidth
+     {\hss                        % so don't change this
+      \vbox to \textheight
+        {\offinterlineskip
+         \freezetextwidth
+         \hsize\textwidth      % local variant of \sethsize
+         \boxmaxdepth\maxdepth
+         \noindent                % content can be < \hsize
+         \dopagecontents#2#3}%
+      \hss}%
+   \dp#1\zeropoint}
+
+\definepalet
+  [layout]
+  [grid=red,
+   page=green]
+
+\def\addtextgridlayer#1% tzt run time
+  {\ifcase\showgridstate\else % 1=bottom 2=top
+     \setgridbox\scratchbox\makeupwidth\textheight
+     \setbox#1\hbox
+       {\ifcase\showgridstate\or\or\box#1\hskip-\makeupwidth\fi
+        \bgroup % color
+        \startlayoutcomponent{gridcolumns}{grid columns}%
+        \incolortrue
+        \ifcase\layoutcolumns\else
+          \gray
+          \hbox to \makeupwidth
+            {\dorecurse\layoutcolumns
+               {\hskip\layoutcolumnwidth
+                \ifnum\recurselevel<\layoutcolumns
+                  \vrule
+                    \!!height\ht\scratchbox
+                    \!!depth\dp\scratchbox
+                    \!!width\layoutcolumndistance
+                \fi}}%
+          \hskip-\makeupwidth
+        \fi
+        \stoplayoutcomponent
+        \startlayoutcomponent{gridlines}{grid lines}%
+        \startcolor[layout:grid]\box\scratchbox\stopcolor
+        \stoplayoutcomponent
+        \egroup
+        \ifcase\showgridstate\or\hskip-\makeupwidth\box#1\fi}%
+   \fi}
+
+%D The placement of a whole line is handled by the next two
+%D macros. These are hooked into the general purpose token
+%D list registers mentioned before.
+
+\def\ignoredlinebreak{\unskip\space\ignorespaces}
+
+\def\doplacelayouttextline#1#2%
+  {\ifdim#2>\zeropoint\relax  % prevents pagenumbers when zero height
+     \goleftonpage
+     \hbox
+       {\setbox\scratchpagebox\vbox to #2
+          {%\forgetall
+           \vsize#2\relax
+           \normalbaselines
+           \let\\\ignoredlinebreak
+           \let\crlf\ignoredlinebreak
+          %\getvalue{\??tk#1\v!text\c!before}%
+           \getvalue{\??tk#1\c!before}%
+           \doifbothsidesoverruled
+             {\dodoplacelayouttextline#1\c!lefttext \c!middletext\c!righttext\gobbleoneargument\getvalue}
+             {\dodoplacelayouttextline#1\c!lefttext \c!middletext\c!righttext\gobbleoneargument\getvalue}
+             {\dodoplacelayouttextline#1\c!righttext\c!middletext\c!lefttext \getvalue\gobbleoneargument}%
+          %\getvalue{\??tk#1\v!text\c!after}%
+           \getvalue{\??tk#1\c!after}%
+           \kern\zeropoint}% keep the \dp, beware of \vtops, never change this!
+        \dp\scratchpagebox\zeropoint
+        \box\scratchpagebox}%
+     \vskip-#2\relax
+   \fi}
+
+\def\dodoplacelayouttextline#1#2#3#4#5#6% \hsize toegevoegd, \hss's niet meer wijzigen
+  {\hbox
+     {\ifdim\leftedgewidth>\zeropoint
+        \dododoplacelayouttextline\leftedgewidth{#1}\v!edge
+          {\hss\getvalue{\??tk#1\v!edge#2}}%
+        \hskip\leftedgedistance
+      \fi
+      \ifdim\leftmarginwidth>\zeropoint
+        \dododoplacelayouttextline\leftmarginwidth{#1}\v!margin
+          {\hbox to \leftmarginwidth
+             {\hss\getvalue{\??tk#1\v!margin#2}}%
+           \hskip-\leftmarginwidth
+           \hbox to \leftmarginwidth
+             {\hss#5{\??tk#1\v!margin\c!margintext}}}%
+        \hskip\leftmargindistance
+      \fi
+      \ifdim\makeupwidth>\zeropoint
+        \dododoplacelayouttextline\makeupwidth{#1}\v!text
+          {\hbox to \makeupwidth
+             {\@@nmpre{#5{\??tk#1\v!text\c!marginedgetext}}%
+              \getvalue{\??tk#1\v!text#2}\hss}%
+           \hskip-\makeupwidth
+           \hbox to \makeupwidth
+             {\hss\getvalue{\??tk#1\v!text#3}\hss}%
+           \hskip-\makeupwidth
+           \hbox to \makeupwidth
+             {\hss\getvalue{\??tk#1\v!text#4}%
+              \@@nmpos{#6{\??tk#1\v!text\c!marginedgetext}}}}%
+      \fi
+      \ifdim\rightmarginwidth>\zeropoint
+        \hskip\rightmargindistance
+        \dododoplacelayouttextline\rightmarginwidth{#1}\v!margin
+          {\hbox to \rightmarginwidth
+             {\getvalue{\??tk#1\v!margin#4}\hss}%
+           \hskip-\rightmarginwidth
+           \hbox to \rightmarginwidth
+             {#6{\??tk#1\v!margin\c!margintext}\hss}}%
+      \fi
+      \ifdim\rightedgewidth>\zeropoint
+        \hskip\rightedgedistance
+        \dododoplacelayouttextline\rightedgewidth{#1}\v!edge
+          {\getvalue{\??tk#1\v!edge#4}\hss}%
+      \fi}}
+
+% \def\dododoplacelayouttextline#1#2#3#4%
+%   {\vbox % to \vsize
+%      {\hsize#1\relax
+%       \getvalue{\??tk#2#3\c!voor}
+%       \hbox to #1{#4}%
+%       \getvalue{\??tk#2#3\c!na}}}
+
+\def\dododoplacelayouttextline#1#2#3#4%
+  {\vbox % to \vsize
+     {\hsize#1\relax
+      \getvalue{\??tk#2#3\c!before}%
+      \startlayoutcomponent{t:#2:#3}{area #2 #3}%
+        \hbox to #1{#4}%
+      \stoplayoutcomponent
+      \getvalue{\??tk#2#3\c!after}}}
+
+%D Although it is far better to use backgrounds for this
+%D purpose, one can add a rule in the following way. This
+%D method makes the rules disappear in case of an empty text
+%D line. Consider this a feature.
+%D
+%D \starttyping
+%D \setupheadertexts[left][right]
+%D
+%D \setupheader[text][after=\hrule,style=bold]
+%D
+%D \starttext
+%D   \input tufte \page
+%D   \setupheader[state=empty]
+%D   \input tufte \page
+%D \stoptext
+%D \stoptyping
+
+%D The next twosome will be done differently (using an
+%D existing auxiliary macro).
+
+% \def\@@nmpre#1{\setbox0\hbox{#1}\ifdim\wd0=\zeropoint\else\unhbox0\tfskip\fi}
+% \def\@@nmpos#1{\setbox0\hbox{#1}\ifdim\wd0=\zeropoint\else\tfskip\unhbox0\fi}
+
+% cleaner
+
+\def\@@nmpre#1{\doiftext{#1}{{#1}\tfskip}}
+\def\@@nmpos#1{\doiftext{#1}{\tfskip{#1}}}
+
+% newer
+
+\def\@@nmprepos#1#2#3#4#5%
+  {\doifelsenothing\@@nmwidth
+     {\doiftext{#5}{#1{#5}#2}}
+     {\doiftext{#5}{\hbox to \@@nmwidth{#3{#5}#4}}}}
+
+\def\@@nmpre{\@@nmprepos\empty\tfskip\relax\hss}
+\def\@@nmpos{\@@nmprepos\tfskip\empty\hss\relax}
+
+%D This code will move to \type {page-flt.tex}.
+
+\appendtoks
+  \plaatsrechtermargeblok \hskip-\rightmarginwidth
+\to \rightmargintextcontent
+
+\appendtoks
+  \plaatslinkermargeblok \hskip-\leftmarginwidth
+\to \leftmargintextcontent
+
+%D The next hook will later be used for keeping track of
+%D positions, i.e.\ it will provide a proper (page
+%D dependent) reference point.
+
+\ifx\undefined\placepositionanchors
+  \def\placepositionanchors{\vskip\textheight}
+\fi
+
+%D \macros
+%D   {definetext}
+%D
+%D Some macros ago, we implemented the \type {status} option
+%D \type {unknown}. This one is used to take care of
+%D symbolic texts handlers.
+%D
+%D \showsetup{definetext}
+%D
+%D The next example demonstrates how we can use this
+%D mechanism to provide page (event) dependent text lines.
+%D
+%D \starttyping
+%D \definetext[chapter][footer][pagenumber]
+%D \setuphead[chapter][header=high,footer=chapter]
+%D \setupheadertexts[pagenumber]
+%D \setupfootertexts[left][right]
+%D \chapter{eerste} \dorecurse{20}{\input tufte \relax}
+%D \chapter{tweede} \dorecurse{20}{\input tufte \relax}
+%D \stoptyping
+
+\def\definetext
+  {\doseventupleempty\dodefinetext}
+
+\def\dodefinetext[#1][#2][#3][#4][#5][#6][#7]%
+  {\ifseventhargument
+     \setvalue{\??tk#2#3#1}{\dosixtupleempty\dosetuptexts[#2][#3][#4][#5][#6][#7]}%
+   \else\ifsixthargument
+     \setvalue{\??tk  #2#1}{\dosixtupleempty\dosetuptexts[#2][#3][#4][#5][#6]}%
+   \else\iffifthargument
+     \setvalue{\??tk#2#3#1}{\dosixtupleempty\dosetuptexts[#2][#3][#4][#5]}%
+   \else\iffourthargument
+     \setvalue{\??tk  #2#1}{\dosixtupleempty\dosetuptexts[#2][#3][#4]}%
+   \else
+     \setvalue{\??tk  #2#1}{\dosixtupleempty\dosetuptexts[#2][#3]}%
+   \fi\fi\fi\fi}
+
+%D The rest of this file is dedicated to setting up the
+%D texts. This code is not that impressive.
+
+\setupheadertexts [\v!text] [] []
+\setupheadertexts [\v!margin] [] []
+\setupheadertexts [\v!edge]  [] []
+
+\setupfootertexts [\v!text] [] []
+\setupfootertexts [\v!margin] [] []
+\setupfootertexts [\v!edge]  [] []
+
+\setuptexttexts   [\v!text] [] []
+\setuptexttexts   [\v!margin] [] []
+\setuptexttexts   [\v!edge]  [] []
+
+\setupbottomtexts [\v!text] [] []
+\setupbottomtexts [\v!margin] [] []
+\setupbottomtexts [\v!edge]  [] []
+
+\setuptoptexts    [\v!text] [] []
+\setuptoptexts    [\v!margin] [] []
+\setuptoptexts    [\v!edge]  [] []
+
+% alternative
+%
+% \def\resetlayouttekst%
+%   {\dodoubleempty\doresetlayouttekst}
+%
+% \def\doresetlayouttekst[#1][#2]%
+%   {\ifsecondargument
+%      \dodoresetlayouttekst[#1][#2]%
+%    \else
+%      \dodoresetlayouttekst[#1][\v!tekst]%
+%    \fi}
+%
+% \def\dodoresetlayouttekst[#1][#2]%
+%   {...}
+%
+% \def\docommand#1%
+%   {\resetlayouttekst[#1][\v!tekst]%
+%    \resetlayouttekst[#1][\v!marge]%
+%    \resetlayouttekst[#1][\v!rand]}
+
+%D We combine a lot of similar settings in a macro that
+%D we will later dispose.
+
+\def\dodocommand[#1][#2]%
+  {\getparameters
+     [\??tk#1#2]
+     [%\c!state=\v!normal, % moved
+      \c!before=,  % both global and local are used
+      \c!after=,    % both global and local are used
+      \c!strut=, % the local one, not (yet) used
+      \c!style=\getvalue{\??tk#1\c!style},% hm, got lost
+      \c!color=\getvalue{\??tk#1\c!color},  % hm, got lost
+      \c!lefttext=,
+      \c!middletext=,
+      \c!righttext=,
+      \c!marginedgetext=,
+      \c!margintext=,
+      \c!width=]%
+   \inheritparameter[\??tk#1#2][\c!leftstyle  ][\c!style ]%
+   \inheritparameter[\??tk#1#2][\c!rightstyle ][\c!style ]%
+   \inheritparameter[\??tk#1#2][\c!leftcolor   ][\c!color  ]%
+   \inheritparameter[\??tk#1#2][\c!rightcolor  ][\c!color  ]%
+   \inheritparameter[\??tk#1#2][\c!leftwidth ][\c!width]%
+   \inheritparameter[\??tk#1#2][\c!rightwidth][\c!width]}
+
+\def\docommand#1%
+  {\dodocommand[#1][\v!text]%
+   \dodocommand[#1][\v!margin]%
+   \dodocommand[#1][\v!edge]}
+
+\docommand\v!top
+\docommand\v!header
+\docommand\v!footer
+\docommand\v!text
+\docommand\v!bottom
+
+\let\docommand  \relax
+\let\dodocommand\relax
+
+%D While the header and footer lines are moved away from the
+%D main text, the top and bottom lines are centered.
+
+\setuptop   [\c!state=\v!normal,\c!before=\vss,\c!after=\vss,\c!strut=]
+\setupheader[\c!state=\v!normal,\c!before=,    \c!after=\vss,\c!strut=\v!yes]
+\setuptext  [\c!state=\v!normal,\c!before=\vss,\c!after=\vss,\c!strut=]
+\setupfooter[\c!state=\v!normal,\c!before=\vss,\c!after=,    \c!strut=\v!yes]
+\setupbottom[\c!state=\v!normal,\c!before=\vss,\c!after=\vss,\c!strut=]
+
+\setuptop   [\c!style=,\c!color=]
+\setupheader[\c!style=,\c!color=]
+\setuptext  [\c!style=,\c!color=]
+\setupfooter[\c!style=,\c!color=]
+\setupbottom[\c!style=,\c!color=]
+
+\protect \endinput