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%D \module
%D [ file=page-mbk, % was part of page-mis.mkiv / 2008.11.17
%D version=2011.11.23, % was part of page-flt.tex / 2000.10.20
%D title=\CONTEXT\ Page Macros,
%D subtitle=Margin Floats,
%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 / Margin Floats}
\unprotect
%D This is an old mechanism that is quite independent of other floats. There is for
%D instance no save/restore used here. When there is need (and demand) we can use
%D the float cache and then flush them in the text when they are left over. On the
%D other hand, margin float are somewhat manual so it does not make too much sense
%D to complicate the code. As an alternative users can fall back on margin texts:
%D they do stack but don't float.
%D
%D \starttyping
%D \dorecurse{9} {
%D \placefigure[margin]{#1}{}
%D \input ward
%D }
%D \page \null % will flush them
%D \stoptyping
% status=start: in margin
% status=stop : in text
%
% todo: flush margin floats at end of text
% todo: separate boxes for left and right
\installcorenamespace{marginblock}
\installcorenamespace{marginblocklocation}
\installcommandhandler \??marginblock {marginblock} \??marginblock
\aliased\let\setupmarginblocks\setupmarginblock
\newconditional\c_page_margin_blocks_enabled % not really needed as we can check each time
\newconditional\c_page_margin_blocks_present
\newbox \b_page_margin_blocks
\newbox \b_page_margin_blocks_prepared
\appendtoks
\doifelse{\rootmarginblockparameter\c!state}\v!start
\settrue\setfalse\c_page_margin_blocks_enabled
\to \everysetupmarginblock
\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!before=,
%\c!after=,
\c!inbetween=\blank,
\c!bottom=\vfill]
\definesystemconstant{marginblock}
\resetboxesincache \s!marginblock \s!marginblock
\setfalse\c_page_margin_blocks_enabled
\let\page_margin_blocks_stop_block\relax
\permanent\tolerant\protected\def\startmarginblock[#tag]%
{\begingroup
\edef\currentmarginblock{#tag}%
\ifcstok{\marginblockparameter\c!state}\v!start
\expandafter\page_margin_blocks_start_block_yes
\else
\expandafter\page_margin_blocks_start_block_nop
\fi}
\permanent\protected\def\stopmarginblock
{\page_margin_blocks_stop_block
\endgroup}
\def\page_margin_blocks_start_block_yes
{%\showmessage\m!layouts4\empty
\global\settrue\c_page_margin_blocks_enabled
\dowithnextboxcs
\page_margin_blocks_start_block_save
\vbox\bgroup
\let\page_margin_blocks_stop_block\page_margin_blocks_stop_block_yes
\hsize\marginblockparameter\c!width
\usealignparameter\marginblockparameter
\usemarginblockstyleandcolor\c!style\c!color
\begstrut
\ignorespaces}
\def\page_margin_blocks_stop_block_yes
{\removeunwantedspaces
\endstrut
\egroup}
\def\page_margin_blocks_start_block_save
{\putboxincache\s!marginblock{+}\nextbox}
\def\page_margin_blocks_start_block_nop
{%\showmessage\m!layouts5\empty
\marginblockparameter\c!before
\bgroup
\let\page_margin_blocks_stop_block\page_margin_blocks_stop_block_nop
\usemarginblockstyleandcolor\c!style\c!color}
\def\page_margin_blocks_stop_block_nop
{\egroup
\marginblockparameter\c!after}
\permanent\protected\def\checkmarginblocks
{\ifconditional\c_page_margin_blocks_enabled\ifcase\getboxcountfromcache\s!marginblock\else
\expandafter\page_margin_blocks_check_indeed
\fi\fi}
\def\page_margin_blocks_check_indeed
{\ifcsname\??marginblocklocation\marginblockparameter\c!location\endcsname
\page_margin_blocks_prepare_box
\csname\??marginblocklocation\marginblockparameter\c!location\endcsname
\else
\global\setbox\b_page_margin_blocks\emptybox
\fi}
\def\page_margin_blocks_prepare_box
{\begingroup
\scratchcounter\zerocount
\localcontrolledloop \plusone \getboxcountfromcache\s!marginblock \plusone
{\scratchcounter\currentloopiterator
\setbox\scratchbox\vbox\bgroup
\marginblockparameter\c!top
\localcontrolledloop \plusone \scratchcounter \plusone
{\ifcase\currentloopiterator\or
\marginblockparameter\c!before
\else
\marginblockparameter\c!inbetween
\fi
\setbox\scratchbox\emptyvbox
\ht\scratchbox\getboxhtfromcache\s!marginblock{\number\currentloopiterator}%
\dp\scratchbox\getboxdpfromcache\s!marginblock{\number\currentloopiterator}%
\box\scratchbox
\marginblockparameter\c!after}%
\marginblockparameter\c!bottom
\egroup
\ifdim\htdp\scratchbox>\textheight
\advanceby\scratchcounter\minusone
%\writestatus{quit}{\the\scratchcounter=>\the\htdp\scratchbox}
\quitloop
\else
%\writestatus{progress}{\the\htdp\scratchbox}
\fi}%
\ifcase\scratchcounter\else
\global\setbox\b_page_margin_blocks_prepared\vbox to \textheight\bgroup
\marginblockparameter\c!top
\localcontrolledloop \plusone \scratchcounter \plusone
{\ifcase\currentloopiterator\or
\marginblockparameter\c!before
\else
\marginblockparameter\c!inbetween
\fi
\getboxfromcache\s!marginblock{\number\currentloopiterator}\scratchbox
\box\scratchbox
\marginblockparameter\c!after}%
\marginblockparameter\c!bottom
\egroup
\pruneboxesincache\s!marginblock
\ifcase\getboxcountfromcache\s!marginblock\relax
\global\settrue\c_page_margin_blocks_enabled
\fi
\fi
\endgroup}
% inner outer
\permanent\protected\def\page_margin_blocks_place_r_yes
{\setbox\b_page_margin_blocks_prepared\hbox to \rightmarginwidth
{\marginblockparameter\c!left
\box\b_page_margin_blocks_prepared
\marginblockparameter\c!right}%
\vsmashbox\b_page_margin_blocks_prepared
\box\b_page_margin_blocks_prepared}
\permanent\protected\def\page_margin_blocks_place_l_yes
{\setbox\b_page_margin_blocks_prepared\hbox to \leftmarginwidth
{\marginblockparameter\c!right
\box\b_page_margin_blocks_prepared
\marginblockparameter\c!left}%
\vsmashbox\b_page_margin_blocks_prepared
\box\b_page_margin_blocks_prepared}
\permanent\protected\def\page_margin_blocks_place_r_nop{\hskip\rightmarginwidth}
\permanent\protected\def\page_margin_blocks_place_l_nop{\hskip\leftmarginwidth}
\aliased\let\placerightmarginblock\page_margin_blocks_place_r_nop
\aliased\let\placeleftmarginblock \page_margin_blocks_place_l_nop
\def\page_margin_blocks_set_r_box{\enforced\aliased\let\placerightmarginblock\page_margin_blocks_place_r_yes}
\def\page_margin_blocks_set_l_box{\enforced\aliased\let\placeleftmarginblock \page_margin_blocks_place_l_yes}
\letcsname\??marginblocklocation\v!left \endcsname\page_margin_blocks_set_l_box
\letcsname\??marginblocklocation\v!right\endcsname\page_margin_blocks_set_r_box
\defcsname\??marginblocklocation\v!inmargin\endcsname
{\doifbothsidesoverruled
\page_margin_blocks_set_r_box
\page_margin_blocks_set_r_box
\page_margin_blocks_set_l_box}
\defcsname\??marginblocklocation\v!middle\endcsname
{\doifbothsidesoverruled
\page_margin_blocks_set_r_box
\page_margin_blocks_set_l_box
\page_margin_blocks_set_r_box}
% margin floats (keyword 'margin' in option list)
\protected\def\page_margin_blocks_process_float
{\doifelse{\marginblockparameter\c!state}\v!start
\page_margin_blocks_process_float_yes
\page_margin_blocks_process_float_nop}
\def\page_margin_blocks_process_float_yes
{\global\settrue\c_page_margin_blocks_enabled
\putboxincache\s!marginblock{+}\floatbox}
\def\page_margin_blocks_process_float_nop
{\handlefloatmethod\v!here}
\appendtoks
\ifcase\getboxcountfromcache\s!marginblock\else
\writestatus\m!layouts{beware: there are left-over margin floats!}%
\fi
\to \everystoptext
\permanent\protected\def\flushmarginblocks
{\ifconditional\c_page_margin_blocks_enabled
\page_otr_command_flush_margin_blocks
\fi}
\permanent\tolerant\protected\def\flushallmarginblocks[#1]%
{\ifconditional\c_page_margin_blocks_enabled
\begingroup
\scratchcounterone\getboxcountfromcache\s!marginblock\relax
\ifcase\scratchcounterone\else
\scratchcountertwo\ifparameter#1\or\numexpr\scratchcounterone-#1+\plusone\relax\else\plusone\fi
\localcontrolledloop \scratchcountertwo \scratchcounterone \plusone
{\ifcase\currentloopiterator\or
\marginblockparameter\c!before
\else
\marginblockparameter\c!inbetween
\fi
\getboxfromcache\s!marginblock{\number\currentloopiterator}\scratchbox
\box\scratchbox
\marginblockparameter\c!after}%
\pruneboxesincache\s!marginblock
\fi
\endgroup
\fi}
\protect \endinput
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