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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
%D floats. There is for instance no save/restore used here. When
%D there is need (and demand) we can use the float cache and then
%D flush them in the text when they are left over. On the other
%D hand, margin float are somewhat manual so it does not make too
%D much sense to complicate the code. As an alternative users can
%D fall back on margin texts: 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
\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]
\unexpanded\def\startmarginblock
{\dosingleempty\page_margin_blocks_start_block}
\unexpanded\def\stopmarginblock
{\page_margin_blocks_stop_block}
\def\page_margin_blocks_start_block[#tag]%
{\begingroup
\edef\currentmarginblock{#tag}%
\doifelse{\marginblockparameter\c!state}\v!start
\page_margin_blocks_start_block_yes
\page_margin_blocks_start_block_nop}
\def\page_margin_blocks_stop_block
{\doifelse{\marginblockparameter\c!state}\v!start
\page_margin_blocks_stop_block_yes
\page_margin_blocks_stop_block_nop
\endgroup}
\def\page_margin_blocks_start_block_yes % 2 maal \vbox ivm \unvbox elders
{\showmessage\m!layouts4\empty
\global\settrue\c_page_margin_blocks_present
\global\setbox\b_page_margin_blocks\vtop\bgroup\vbox\bgroup
\hsize\marginblockparameter\c!width
\ifvoid\b_page_margin_blocks\else
\unvbox\b_page_margin_blocks
\marginblockparameter\c!inbetween
\fi
\setupalign[\marginblockparameter\c!align]%
\usemarginblockstyleandcolor\c!style\c!color
\begstrut
\ignorespaces}
\def\page_margin_blocks_stop_block_yes
{\removeunwantedspaces
\endstrut
\egroup
\egroup}
\def\page_margin_blocks_start_block_nop
{\showmessage\m!layouts5\empty
\marginblockparameter\c!before
\bgroup
\usemarginblockstyleandcolor\c!style\c!color}
\def\page_margin_blocks_stop_block_nop
{\egroup
\marginblockparameter\c!after}
\def\page_margin_blocks_reshape
{\ifdim\ht\b_page_margin_blocks_prepared>\zeropoint
\beginofshapebox
\unvbox\b_page_margin_blocks_prepared
\endofshapebox
\reshapebox
{\box\shapebox}%
\setbox\b_page_margin_blocks_prepared\vbox to \textheight
{\marginblockparameter\c!top
\flushshapebox
\marginblockparameter\c!bottom}%
\fi}
\unexpanded\def\checkmarginblocks
{\ifvoid\b_page_margin_blocks
\global\setfalse\c_page_margin_blocks_present
\else
\page_margin_blocks_check_indeed
\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
\global\setfalse\c_page_margin_blocks_present
\fi}
\def\page_margin_blocks_prepare_box
{\setbox\b_page_margin_blocks_prepared\vbox
{\forgetall
\splittopskip\topskip
\ifvoid\b_page_margin_blocks\else
\ifdim\ht\b_page_margin_blocks>\textheight
\vsplit\b_page_margin_blocks to \textheight
\else
\unvbox\b_page_margin_blocks
\fi
\fi}%
\page_margin_blocks_reshape
\setbox\b_page_margin_blocks_prepared\vbox
{\marginblockparameter\c!before
\box\b_page_margin_blocks_prepared
\marginblockparameter\c!after}}
% inner outer
\setvalue{\??marginblocklocation\v!left }{\page_margin_blocks_set_l_box}
\setvalue{\??marginblocklocation\v!right }{\page_margin_blocks_set_r_box}
\setvalue{\??marginblocklocation\v!inmargin}{\doifbothsidesoverruled
\page_margin_blocks_set_r_box
\page_margin_blocks_set_r_box
\page_margin_blocks_set_l_box}
\setvalue{\??marginblocklocation\v!middle }{\doifbothsidesoverruled
\page_margin_blocks_set_r_box
\page_margin_blocks_set_l_box
\page_margin_blocks_set_r_box}
\unexpanded\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}
\unexpanded\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}
\unexpanded\def\page_margin_blocks_place_r_nop{\hskip\rightmarginwidth}
\unexpanded\def\page_margin_blocks_place_l_nop{\hskip\leftmarginwidth}
\let\placerightmarginblock\page_margin_blocks_place_r_nop
\let\placeleftmarginblock \page_margin_blocks_place_l_nop
\def\page_margin_blocks_set_r_box{\let\placerightmarginblock\page_margin_blocks_place_r_yes}
\def\page_margin_blocks_set_l_box{\let\placeleftmarginblock \page_margin_blocks_place_l_yes}
% margin floats (keyword 'margin' in option list)
\unexpanded\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\setbox\b_page_margin_blocks\vbox
{\hsize\marginblockparameter\c!width
\unvcopy\b_page_margin_blocks
\ifvoid\b_page_margin_blocks\else
\expandafter\marginblockparameter\expandafter\c!inbetween
\fi
\box\floatbox
\filbreak}%
\ifdim\ht\b_page_margin_blocks>\textheight
% \dosavefloatinfo % no saving done anyway
\else
\doinsertfloatinfo
\fi}
\def\page_margin_blocks_process_float_nop
{\handlefloatmethod\v!here}
\def\page_margin_blocks_float_before
{\ifconditional\c_page_margin_blocks_enabled
\doifinset\v!margin\floatlocation\endgraf
\fi}
\def\page_margin_blocks_float_set_hsize
{\ifconditional\c_page_margin_blocks_enabled
\doifinset\v!margin\floatlocation{\hsize\rootmarginblockparameter\c!width}%
\fi}
\appendtoks
\ifvoid\b_page_margin_blocks \else
\writestatus\m!layouts{beware: there are left-over margin floats!}%
\fi
\to \everystoptext
\unexpanded\def\flushmarginblocks
{\page_otr_command_flush_margin_blocks}
\protect \endinput
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