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% This file is part of the Lecturer package.
% Paul Isambert -- July 2010.
%
% ATTRIBUTES
%
\def\ltr@step_restrictions{%
vskip hskip everyvstep everyhstep left right
transition handout visible group color font on off pdftitle }
\ltr@boolean_attr{step:handout}
\ltr@boolean_attr{step:visible}
\ltr@boolean_attr{step:group}
\ltr@setattribute step:handout;=true
\defactiveparameter step {%
\ltr@delete_empty{#1:font}%
}%
\def\ltr@step_clear{%
\ifltr@step_open
\ltr@ifattribute ltr@inner_step:font;
{\ltr@usevalueor ltr@inner_slide:font;{\ltr@usevalue job:font;}}{}%
\ltr@ifvalue ltr@inner_step:group; = true
{\endgroup}{}%
\ltr@passvalueand{\reverse\iffemptystring}ltr@inner_step:color;
{{\pdfcolorstack0 pop}}{}%
\pdfliteral direct {EMC}%
\ltr@setattribute ltr@inner_step:meta; = step
\passexpanded{\ltr@attribute_deletion{ltr@inner_step}}\ltr@step_restrictions
\fi
}
\passexpandednobraces{\restrictparameter step ltr@inner_step:}\ltr@step_restrictions\par
\ltr@boolean_attr{ltr@inner_step:handout}
\ltr@boolean_attr{ltr@inner_step:visible}
\ltr@boolean_attr{ltr@inner_step:group}
\long\def\setstep#1#2\par{%
\ltr@setstep_do{#2}{#1}%
}%
\newfor\ltr@setstep_do{1}#2{%
\ltr@ifattribute {ltr@\commandtoname#2@inner_step}:meta;
{\setparameter{ltr@\commandtoname#2@inner_step}:}
{\ltr@setstep_new{#2}}%
#1\par
}
\def\ltr@setstep_new#1{%
\def#1{%
\ltr@step_clear
\ltr@setattribute ltr@inner_step:meta;={ltr@\commandtoname#1@inner_step}
\ltr@step_do}%
\passexpandednobraces{\restrictparameter {ltr@\commandtoname#1@inner_step}:}\ltr@step_restrictions\par
\ltr@boolean_attr{{ltr@\commandtoname#1@inner_step}:visible}%
\ltr@boolean_attr{{ltr@\commandtoname#1@inner_step}:handout}%
\ltr@boolean_attr{{ltr@\commandtoname#1@inner_step}:group}%
\defactiveparameter{ltr@\commandtoname#1@inner_step}{%
\ltr@delete_empty{##1:font}%
}%
\setparameter{ltr@\commandtoname#1@inner_step}:
meta = step
}
\setparameter ltr@inner_step:
meta = step
%
%
%
%
%
% The \step command.
%
\newif\ifltr@step_open
\newcount\ltr@steps_count
\newcount\ltr@activesteps_count
\def\step{%
% Close the current step, if any.
\ltr@step_clear
\ltr@step_do
}
% Steps created with \newstep goes there directly.
\def\ltr@step_do{%
\global\ltr@step_opentrue
\ifnextnospace[{\ltr@step_create}{\ltr@step_create[]}%
}
\newif\ifltr@step_standalone
%
% For the options.
%
\newif\ifltr@step_named
\def\ltr@stepcheck_useatom#1{%
\ltr@step_namedtrue
\reverse\iffcs{ltr@step_objnum:#1_\the\slideno}
{\pdfobj reserveobjnum%
\xdefcs{ltr@step_objnum:#1_\the\slideno}{\the\pdflastobj\spacecs}}%
\global\lettocs\ltr@step_current{ltr@step_objnum:#1_\the\slideno}%
}
\def\ltr@stepcheck_usepair#1#2{}
%
\def\ltr@step_useatom#1{%
\ifstring{#1}{here}
{\ltr@error{You can't name a step `here', it's a keyword}}
{\def\ltr@step_ref{#1}%
\iffemptycommand\ltr@step_pdftitle{\def\ltr@step_pdftitle{#1}}}%
}
\def\ltr@step_usepair#1#2{%
\ifstring{#1}{on}
{\ltr@step_standalonefalse\ltr@step_onoff{on}{#2 }}
{\ifstring{#1}{off}
{\ltr@step_onoff{off}{#2 }}
{\ifstring{#1}{pdftitle}
{\def\ltr@step_pdftitle{#2}}
{\ltr@setattribute ltr@inner_step:#1;={#2} }}}%
}
\def\ltr@step_usepair#1#2{%
\ifstring{#1}{pdftitle}
{\def\ltr@step_pdftitle{#2}}
{\ltr@setattribute ltr@inner_step:#1;={#2} }%
}
\def\ltr@step_onoff#1#2{%
\reverse\iffemptystring{#2}
{\ltr@step_onoffloop{#1}{#2 }}%
}
\newfornoempty\ltr@step_onoffloop{1}#2 {%
\ifstring{#2}{here}{\ltr@step_standalonetrue}{%
\ifcs{ltr@step_#2:#1}
{\global\eaddrightcs}
{\xdefcs}
{ltr@step_#2:#1}{\ltr@step_current 0 R }}%
% Add the object to ltr@step_OCG:on/off
}
\def\ltr@step_current{}
\def\ltr@step_create[#1]{%
\global\advance\ltr@steps_count1
\ltr@step_namedfalse
\ltr@option_launchloop{stepcheck}{#1}%
\unless\ifltr@step_named
\pdfobj reserveobjnum
\xdef\ltr@step_current{\the\pdflastobj\spacecs}%
\fi
\def\ltr@step_ref{}\def\ltr@step_pdftitle{}%
\ltr@step_standalonefalse
\ltr@option_launchloop{step}{#1}%
\ltr@delete_empty{ltr@inner_step:font}%
\ltr@passvalueor{\ltr@step_onoff{on}}ltr@inner_step:on;\ltr@step_standalonetrue
\ltr@passvalue{\ltr@step_onoff{off}}ltr@inner_step:off;%
\immediate\pdfobj useobjnum\ltr@step_current {%
<< /Type/OCG /Name(%
\ifemptycommand\ltr@step_ref
{\ifemptycommand\ltr@step_pdftitle
{[step \the\ltr@steps_count]}
{\ltr@step_pdftitle}}%
{\ltr@step_pdftitle}) >>
}%
% ... and, if the object has a reference name, it might be referenced,
% so its object number now returns its name.
\reverse\iffemptycommand\ltr@step_ref{\global\letcs{ltr@step_\ltr@step_current:name}\ltr@step_ref}%
% According to the value to the attribute "handout" or "visible"
% this group has base state ON or OFF (see catalog).
\ltr@ifvalue job:mode; = handout
{\ltr@ifvalue ltr@inner_step:handout; = true
{\addvisibleOCG{\ltr@step_current}}
{\addOCG{\ltr@step_current}}}
{\ltr@ifvalue ltr@inner_step:visible; = true
{\addvisibleOCG{\ltr@step_current}\ltr@step_standalonefalse}
{\addOCG{\ltr@step_current}}}%
% Link the step to the OCG.
\addproperties{ltr@step_\the\ltr@steps_count:content}{\ltr@step_current}%
% If the step appears by itself, it is added it to the list to
% be chained in the output routine, and its transition is stored, if any.
\ifltr@step_standalone
\global\advance\ltr@activesteps_count1
\global\eaddright\ltr@page_steplist{\ltr@step_current,}%
\iffcs{ltr@inner_transition:\ltr@usevalueor ltr@inner_step:transition;{ltr@no_value}}
{\xdefcs{ltr@step_\ltr@step_current:transition}{%
\usecs{ltr@inner_transition:\ltr@usevalueor ltr@inner_step:transition;{ltr@no_value}} 0 R}}%
\fi
% The step is opened, and the every...'s released.
\pdfliteral direct {/OC/ltr@step_\the\ltr@steps_count:content BDC}%
\ltr@ifvalue ltr@inner_step:group; = true
{\begingroup}{}%
\ltr@passvalueand{\reverse\iffemptystring}ltr@inner_step:color;
{{\pdfcolorstack0 push {\ltr@passvalue\ltr@color_use ltr@inner_step:color;}}}{}%
\ltr@usevalue ltr@inner_step:font;%
\ifvmode
\ltr@settovalue\vskip ltr@inner_step:vskip;%
\leftskip=0pt \rightskip=0pt plus 1fill\relax
\ltr@ifcasevalue ltr@inner_slide:hpos;
\val ff \rightskip=0pt
\val rr \leftskip=0pt plus 1fill\relax
\val rf \leftskip=0pt plus 1fill\rightskip=0pt
\endval
\ltr@settovalue{\advance\leftskip}ltr@inner_step:left;%
\ltr@settovalue{\advance\rightskip}ltr@inner_step:right;%
\ltr@usevalue ltr@inner_step:everyvstep;%
\else
\ifhmode
\ltr@settovalue\hskip ltr@inner_step:hskip;%
\ltr@usevalue ltr@inner_step:everyhstep;%
\fi
\fi
\ignorespaces
}
\endinput
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