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%D \module
%D [ file=page-ini,
%D version=2000.10.20,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Initializations,
%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 / Initializations}
%D The \type {\processpage} command has become obsolete. It's original
%D purpose was to flush only parts of a document but nowadays we have
%D project structure and modes. This is just one of those very early
%D features that no longer makes sense.
%D The \type {\couplepage} command has become obsolete. It's original
%D purpose was to provide hooks for printer directives (like choosing
%D different paper trays).
\unprotect
%D Shipout control.
\newcount\nofshipouts
\appendtoks
\global\advance\nofshipouts\plusone
\to \everyaftershipout
\newconditional\c_otr_shipout_enabled \settrue\c_otr_shipout_enabled
\unexpanded\def\page_otr_shipout
{\ifconditional\c_otr_shipout_enabled
\expandafter\page_otr_shipout_yes
\else
\expandafter\page_otr_shipout_nop
\fi}
\let\page_otr_shipout_yes\normalshipout
\unexpanded\def\page_otr_shipout_nop
{\writestatus\m!system{ignoring shipout of real page \the\realpageno}%
\global\advance\realpageno\minusone % else no flush of resources
\dowithnextbox{\deadcycles\zerocount}}
% We don't support direct user \shipouts (weird: this does not work, bug?)
%
% \let\shipout\page_otr_shipout_nop
%D Building pages.
\newbox\pagebox
\ifdefined\page_postprocessors_column \else \let\page_postprocessors_column\gobbleoneargument \fi
\ifdefined\page_postprocessors_page \else \let\page_postprocessors_page \gobbleoneargument \fi
\ifdefined\page_postprocessors_box \else \let\page_postprocessors_box \gobbleoneargument \fi
%D Floats.
\def\page_otr_flush_all_floats
{%\flushnotes already done
\ifconditional\c_page_floats_some_waiting
\begingroup
\c_page_floats_n_of_top\plusthousand
\c_page_floats_n_of_bottom\zerocount
% this is needed in case a float that has been stored
% ends up at the current page; this border case occurs when
% the calculated room is 'eps' smaller that the room available
% when just flushing; so now we have (maybe optional):
\pagebaselinecorrection % hm, needs checking, not needed when no floats
% alas, this is tricky but needed (first surfaced in prikkels)
\page_otr_command_flush_floats
\endgroup
\fi}
\def\page_otr_insert_dummy_page
{\par
\ifvmode
\page_otr_flush_all_floats
\fixedspace
\vfill
\page_otr_command_next_page
\fi}
\def\page_otr_flush_pending_content
{\vskip\zeropoint\relax % brrr .. get rid of this
\ifvoid\normalpagebox \else
\unvbox\normalpagebox
\penalty\outputpenalty
\fi}
\def\page_otr_construct_and_shipout#1#2%
{\forgetall
\page_boxes_shipout{\page_boxes_constructed_page#1#2}% \hbox removed
\page_otr_flush_pending_content
% not really needed, replaced by \flushsavedfloats
\page_otr_check_for_pending_inserts
% but does not hurt either (we're still in the otr!)
\inpagebodytrue % needed for enabling \blank ! brrr
\page_otr_command_flush_saved_floats
\page_otr_command_set_vsize % this is needed for interacting components, like floats and multicolumns
\strc_pagenumbers_increment_counters % should hook into an every
\page_adapts_synchronize
\page_otr_check_for_pending_inserts
\page_floats_flush_page_floats % before postponed blocks
\page_spread_flush % defined later
\page_postponed_blocks_flush}
% Can't we get rid of this hackery? It's used in some widgets
% stuff so probably not.
\newbox\b_page_otr_special
\def\page_otr_flush_special_content
{\ifvoid\b_page_otr_special \else
\box\b_page_otr_special
\fi}
\def\page_otr_add_special_content
{\dowithnextboxcs\page_otr_add_special_content_indeed\hbox}
\def\page_otr_add_special_content_indeed
{\wd\nextbox\zeropoint
\ht\nextbox\zeropoint
\dp\nextbox\zeropoint
\global\setbox\b_page_otr_special\hbox
{%\hskip-\maxdimen % not here, fails in acrobat (clips)
\box\b_page_otr_special\box\nextbox}}% was \unhbox, is now box again
\let\flushatshipout\page_otr_add_special_content
\maxdeadcycles=1000
\newtoks\afterpage \newtoks\aftereverypage
\newtoks\beforepage \newtoks\beforeeverypage
\newif\ifarrangingpages \arrangingpagesfalse
\newconstant\pageornamentstate % 0=on 1=one-off 2=always-off
\appendtoks
\ifcase\pageornamentstate \or
\pageornamentstate\zerocount
\fi
\to \everyaftershipout
% Mark synchronization
\newconditional\c_page_marks_building_successive_pages \settrue\c_page_marks_building_successive_pages
\def\page_marks_synchronize_page#1% box
{\strc_markings_synchronize[\v!page][#1][\ifconditional\c_page_marks_building_successive_pages\v!keep\fi]}
\def\page_marks_synchronize_column#1#2#3#4% first last column box
{\ifnum#3=#1\relax
\strc_markings_synchronize[\number#3,\v!column:\number#3,\v!first,\v!column:\v!first][#4][]%
\else\ifnum#3=#2\relax
\strc_markings_synchronize[\number#3,\v!column:\number#3,\v!last, \v!column:\v!last ][#4][]%
\else
\strc_markings_synchronize[\number#3,\v!column:\number#3 ][#4][]%
\fi\fi}
% Page body building
\newconditional\c_page_boxes_save_page_body
\newbox \b_page_boxes_saved_page_body
\def\page_boxes_constructed_page_body#1#2%
{\ifconditional\c_page_boxes_save_page_body \global\setbox\b_page_boxes_saved_page_body \fi \vbox \bgroup
\boxmaxdepth\maxdimen % new
\dontcomplain
\page_marks_synchronize_page {#2}% we could consider doing this for \pagebox (needs testing)
\page_boxes_construct_content \pagebox{#1}{#2}%
\page_backgrounds_add_to_main \pagebox
\page_boxes_apply_offsets \pagebox
\page_info_add_to_box \pagebox
\ifcase\pageornamentstate
\page_backgrounds_add_to_paper \pagebox
\fi
\anch_positions_register_page \pagebox
\ifarrangingpages
\page_boxes_apply_shift_paper \pagebox % \v!paper
\else
\page_boxes_apply_clip_paper \pagebox
\page_marks_add_page \pagebox
\page_boxes_apply_replicate \pagebox
\page_boxes_apply_scale \pagebox
\page_boxes_apply_mirror_paper \pagebox
\page_boxes_apply_orientate_paper \pagebox
\page_marks_add_more \pagebox
\page_boxes_apply_center \pagebox
\page_backgrounds_add_to_print \pagebox
\page_boxes_apply_mirror_print \pagebox
\page_boxes_apply_orientate_print \pagebox
\page_boxes_apply_shift_print \pagebox % \v!page
\page_boxes_apply_offset \pagebox
\page_boxes_apply_negate_print \pagebox
\fi
\box\pagebox
\egroup \ifconditional\c_page_boxes_save_page_body \copy\b_page_boxes_saved_page_body \fi}
\appendtoks \restoreglobalbodyfont \to \everybeforepagebody
\ifdefined\nestednewbox \else \newbox\nestednextbox \fi % hm, still needed?
\prependtoks
\let\nextbox\nestednextbox
\to \everybeforepagebody
\def\page_boxes_constructed_page#1#2%
{\vbox\bgroup % intercept spurious spaces
\the\everybeforepagebody
\starttextproperties
\checkmarginblocks
\the\beforeeverypage
\normalexpanded{\global\beforepage\emptytoks\the\beforepage}%
\inpagebodytrue
\page_boxes_constructed_page_body#1#2%
\normalexpanded{\global\afterpage \emptytoks\the\afterpage }%
\the\aftereverypage
\resetpagebreak
\resetlayouttextlines % will go to \aftereverypage
\stoptextproperties
\the\everyafterpagebody
\egroup}
\def\doiftopofpageelse
{\ifdim\pagegoal=\maxdimen
\expandafter\firstoftwoarguments
\else\ifdim\pagegoal=\vsize
\doubleexpandafter\firstoftwoarguments
\else
\doubleexpandafter\secondoftwoarguments
\fi\fi}
% %D Idea:
%
% \newinsert\thispageinsert % <- installinsertion
%
% \def\flushatthispage
% {\bgroup
% \dowithnextbox{\insert\thispageinsert{\box\nextbox}\egroup}%
% \hbox}
%
% \appendtoks
% \ifvoid\thispageinsert\else\hbox{\smashedbox\thispageinsert}\fi
% \to \everyshipout
%
% %D Idea:
%
% \definemarkedpage[nobackgrounds]
% \markpage[nobackgrounds]
% \doifmarkedpageelse{nobackgrounds}
\protect \endinput
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