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% This file is part of the Lecturer package.
% Paul Isambert -- July 2010.
%
%
% ATTRIBUTES
%
\def\setarea#1#2\par{%
\ltr@space_loop{\ltr@setarea_do{#2}}{#1 }%
}
\long\def\ltr@setarea_do#1#2{%
\ltr@ifattribute {ltr@#2@inner_area}:visible;
{\setparameter {ltr@#2@inner_area}:}
{\ltr@setarea_new{#2}}%
#1\par
}%
\def\ltr@area_list{}%
\def\ltr@setarea_new#1{%
\global\eaddright\ltr@area_list{ltr@#1@inner_area,}%
\passcs{\usecs{newbox}}{ltr@#1@inner_area:box}%
\restrictparameter ltr@#1@inner_area:
width height hshift hshift* vshift vshift* left right top bottom
foreground background topskip baselineskip parindent parskip hpos vpos
visible frame frame_width frame_color frame_corner frame_dash
everyposition everyfreeposition font hsize vsize image
\par
\ltr@restrictattribute ltr@#1@inner_area:visible; true false step\par
\ltr@restrictattribute ltr@#1@inner_area:frame_corner; miter round bevel\par
\ltr@restrictattribute ltr@#1@inner_area:hpos; ff rr fr rf\par
\defactiveparameter ltr@#1@inner_area {%
\ltr@delete_empty{##1:background}%
\ltr@todim_loop{##1}{width height hshift hshift* vshift vshift* left right top bottom hsize vsize
topskip baselineskip parindent frame_width }%
\ltr@dimen_set{##1}{hshift*}{hshift}{width}{\pdfpagewidth}%
\ltr@dimen_set{##1}{vshift*}{vshift}{height}{\pdfpageheight}%
\ltr@deleteattribute ##1:hshift*;%
\ltr@deleteattribute ##1:vshift*;%
\ltr@dimen_set{##1}{right}{left}{hsize}{\ltr@area_width{##1}}%
\ltr@dimen_set{##1}{bottom}{top}{vsize}{\ltr@area_height{##1}}%
\ltr@deleteattribute ##1:right;%
\ltr@deleteattribute ##1:bottom;%
\ltr@ifattribute##1:frame;
{\def\ltr@area_name{#1}\ltr@passvalue{\ltr@option_launchloop{area}}##1:frame;}{}%
\ltr@deleteattribute##1:frame;
\ltr@todim_loop{##1}{frame_width }%
\ltr@ifattribute##1:frame_color;{}
{\ltr@ifattribute##1:background;
{\ltr@setattribute##1:frame_color; = {\ltr@usevalueor##1:background;{white}} }{}}%
}%
\setparameter {ltr@#1@inner_area}:
visible = true
}
\def\ltr@area_usepair#1#2{%
\ltr@setattribute ltr@\ltr@area_name @inner_area:frame_#1;={#2}
}
%
%
%
\def\ltr@area_hshift#1{%
\ltr@usevalueor #1:hshift;{0pt}%
}
\def\ltr@area_vshift#1{%
\ltr@usevalueor #1:vshift;{0pt}%
}
\def\ltr@area_width#1{%
\ltr@usevalueor #1:width;{\dimexpr(\pdfpagewidth-\ltr@area_hshift{#1})}%
}
\def\ltr@area_height#1{%
\ltr@usevalueor #1:height;{\dimexpr(\pdfpageheight-\ltr@area_vshift{#1})}%
}
\def\ltr@area_left#1{%
\ltr@usevalueor #1:left;{0pt}%
}
\def\ltr@area_top#1{%
\ltr@usevalueor #1:top;{0pt}%
}
\def\ltr@area_hsize#1{%
\ltr@usevalueor #1:hsize;{\dimexpr(\ltr@area_width{#1}-\ltr@area_left{#1})\relax}%
}
\def\ltr@area_vsize#1{%
\ltr@usevalueor #1:vsize;{\dimexpr(\ltr@area_height{#1}-\ltr@area_top{#1})\relax}%
}
%
% POSITION
% No attributes, except the optional argument,
% which takes the x and y (downward, \'a la TeX)
% shifts. Most of this is box manipulation.
%
\newcount\ltr@temp_count
\newcount\ltr@position_count
\def\position#1{%
\ifnextnospace[{\ltr@position{#1}}{\ltr@position{#1}[]}%
}
\newife\ifltr@area_do
\long\def\ltr@position#1[#2]{%
\ltr@ifattribute ltr@#1@inner_area:visible;
{\ltr@area_check{#1}%
\ifltr@area_do
{\ltr@position_do{#2}{ltr@#1@inner_area}}
{\gobbleone}}
{\ltr@error{Area `#1' doesn't exist. Material is discarded}\gobbleone}
}
\def\ltr@area_check#1{%
\ltr@area_dotrue
\ltr@ifattribute ltr@inner_slide:areas*;
{\ltr@ifvalue ltr@inner_slide:areas*; = all
{\ltr@area_dofalse}
{\ltr@storevalue\ltr@temp ltr@inner_slide:areas*;
\addright\ltr@temp{ }\addleft\ltr@temp{ }%
\passexpanded{\iffcontains{ #1 }}{\ltr@temp}\ltr@area_dofalse}}
{}%
\ltr@ifattribute ltr@inner_slide:areas;
{\ltr@ifvalue ltr@inner_slide:areas; = all
{}
{\ltr@storevalue\ltr@temp ltr@inner_slide:areas;
\addright\ltr@temp{ }\addleft\ltr@temp{ }%
\passexpanded{\ifcontains{ #1 }}{\ltr@temp}\ltr@area_dotrue\ltr@area_dofalse}}
{}%
}
\newbox\ltr@temp_box
\newdimen\ltr@temp_dimen
\long\def\ltr@position_do#1#2#3{%
\ifemptystring{#1}
% Normal position.
{\setbox\ltr@temp_box=\ltr@position_dobox{#2}{\ltr@usevalue #2:everyposition;#3}}
% Free position.
{\setbox\ltr@temp_box=\vbox{%
\ltr@position_dobox{#2}{\ltr@usevalue #2:everyfreeposition;#3}}%
\ltr@position_getposition#1
\setbox\ltr@temp_box=\vbox{%
\kern\dimexpr(\ltr@position_top+\ltr@usevalueor #2:topskip;\topskip-\ht\ltr@temp_box)\relax
\moveright\ltr@position_left\box\ltr@temp_box
}%
\dp\ltr@temp_box=0pt \ht\ltr@temp_box=0pt
}%
% How to apply topskip?
% If the box isn't empty, that doesn't mean it shouldn't be used,
% since the content of the box might be material freely positioned,
% which doesn't exist, so to speak.
% We can't measure the box either, because if topskip
% is 0pt, one-line material without depth will fill the box
% with height and depth 0pt, as if there were nothing, and
% topskip will be applied again on the next material.
% Hence this pseudo-conditional turned to true the first
% time real material is added.
\ifemptystring{#1}
{\begingroup
\ltr@usevalue #2:font;% So em and ex are right.
\ifcsname #2:done\endcsname
\global\ltr@temp_dimen=\dimexpr(%
\dimexpr(\ltr@usevalueor #2:baselineskip;\baselineskip+\ltr@usevalueor #2:parskip;{0pt})\relax
-\dimexpr(\ht\ltr@temp_box+\dp\usecs{#2:box}))\relax
\ifdim\ltr@temp_dimen<\lineskiplimit
\global\ltr@temp_dimen=\lineskip
\fi
\else
\global\ltr@temp_dimen=\dimexpr(\ltr@usevalueor #2:topskip;\topskip-\ht\ltr@temp_box)\relax%
\global\letcs{#2:done}\relax
\fi
\endgroup}
{\edef\ltr@position_left{\the\ht\usecs{#2:box}}% I could have used special dimensions
\edef\ltr@position_top{\the\dp\usecs{#2:box}}}% but it's a time of austerity.
\global\setbox\usecs{#2:box}=\vbox{%
\unless\ifvoid\usecs{#2:box}
\unvcopy\usecs{#2:box}
\fi
\ifemptystring{#1}
{\kern\ltr@temp_dimen}
{\kern-\dimexpr(\ht\usecs{#2:box}+\dp\usecs{#2:box})\relax}
\ifx\ltr@step_current\emptycs
\ifemptystring{#1}\unvbox\box\ltr@temp_box
\reverse\iffcs{ltr@#2_\the\slideno @inner_area:group}
{\global\letcs{ltr@#2_\the\slideno @inner_area:group}\emptycs}
\else
\global\advance\ltr@position_count1
\pdfliteral {/OC/ltr@position_\the\ltr@position_count:content BDC}
\ifemptystring{#1}\unvbox\box\ltr@temp_box
\pdfliteral {EMC}
\addproperties{ltr@position_\the\ltr@position_count:content}{\ltr@step_current}
\reverse\iffcs{#2_\the\slideno:group}
{\global\letcs{#2_\the\slideno:group}\ltr@step_current
\addproperties{#2_\the\slideno:background}{\usecs{#2_\the\slideno:group}}}
\fi
\reverse\iffemptystring{#1} % Restore the box to its original dimensions.
{\prevdepth-1000pt \vbox to \ht\usecs{#2:box}{\vfil\hbox{\vrule height0pt width0pt depth\dp\usecs{#2:box}}}}%
}%
\ltr@temp_dimen=0pt
}
\def\ltr@position_getposition#1,#2 {%
\edef\ltr@position_left{\ifemptystring{#1}{0pt}{\dimexpr(#1)}}%
\edef\ltr@position_top{\ifemptystring{#2}{0pt}{\dimexpr(#2)}}
}
\long\def\ltr@position_dobox#1#2{%
\vtop{%
\ltr@usevalue #1:font;
\parindent\ltr@usevalueor #1:parindent;{0pt}\relax
\hsize=\ltr@area_hsize{#1}\relax
\ltr@settovalue\baselineskip #1:baselineskip;
\parskip=\ltr@usevalueor #1:parskip;{0pt}\relax
\leftskip=0pt \rightskip=0pt plus 1fill\relax
\ltr@ifcasevalue #1:hpos;
\val ff \rightskip=0pt
\val rr \leftskip=0pt plus 1fill\relax
\val rf \leftskip=0pt plus 1fill \rightskip=0pt
\endval
#2}%
}
\endinput
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