% This file is part of the Lecturer package.
% Paul Isambert -- July 2010.
% 
\def\ltr@link_create#1#2#3{%
  \hbox{%
    \pdfannot{%
      /Subtype/Link
      /Border [0 0 0]
      /H/\ifstring{#1}{none}{N}{\ifstring{#1}{flash}{I}{\ifstring{#1}{push}{P}{N}}}
      \reverse\iffemptycommand\ltr@step_current{/OC \ltr@step_current 0 R}
      /A #2}%
    #3}%
  }
%
\def\firstslide{%
  \ifnext[{\ltr@firstslide}{\ltr@firstslide[]}%
  }
\def\ltr@firstslide[#1]#2{%
  \ltr@link_create{#1}{<< /S/GoTo /D (ltr@linktopage_1) >>}{#2}%
  }
\def\lastslide{%
  \ifnext[{\ltr@lastslide}{\ltr@lastslide[]}%
  }
\def\ltr@lastslide[#1]#2{%
  \ltr@link_create{#1}{<< /S/Named /N/LastPage >>}{#2}%
  }
\def\prevslide{%
  \ifnum\slideno=1
    \expandafter\firstslide
  \else
    \afterfi{\ifnext[{\ltr@prevslide}{\ltr@prevslide[]}}
  \fi
  }
\def\ltr@prevslide[#1]#2{%
  \ltr@link_create{#1}{<< /S/GoTo /D (ltr@linktopage_\the\numexpr\slideno-1\relax)  >>}{#2}%
  }
\def\nextslide{%
  \ifnext[{\ltr@nextslide}{\ltr@nextslide[]}%
  }
\def\ltr@nextslide[#1]#2{%
  \ltr@link_create{#1}{<< /S/GoTo /D (ltr@linktopage_\the\numexpr\slideno+1\relax)  >>}{#2}%
  }
\def\nextstep{%
  \ifnext[{\ltr@nextstep}{\ltr@nextstep[]}%
  }
\def\ltr@nextstep[#1]#2{%
  \ltr@link_create{#1}{<< /S/Named /N/NextPage >>}{#2}%
  }
\def\prevstep{%
  \ifnext[{\ltr@prevstep}{\ltr@prevstep[]}%
  }
\def\ltr@prevstep[#1]#2{%
  \ltr@link_create{#1}{<< /S/Named /N/PrevPage >>}{#2}%
  }
%
\def\anchor#1{%
  \ifcs{ltr@anchor_user:#1}
    {\ltr@error{Anchor `#1' already exists. Find another name}}
    {\global\letcs{ltr@anchor_user:#1}\relax
     \immediate\pdfobj\iffcs{ltr@anchor_objnum:#1}{useobjnum \usecs{ltr@anchor_objnum:#1}}{\ltr@anchor{\the\slideno}{\ltr@activesteps_count}}%
     \reverse\iffcs{ltr@anchor_objnum:#1}{\xdefcs{ltr@anchor_objnum:#1}{\the\pdflastobj\spacecs}}}%
  }
\def\ltr@anchor#1#2{%
  <<
    /S/GoTo /D (ltr@linktopage_#1)
    /Next << /S/JavaScript /JS (\ltr@ifvalue job:autofullscreen; = true {app.fs.isFullScreen = true; }{}%
                                if (app.fs.isFullScreen) {\repeatuntil{#2}{app.execMenuItem("NextPage");}}) >>
  >>}%
\def\goto{%
  \ifnextnospace[{\ltr@goto}{\ltr@goto[none]}%
  }
\def\ltr@goto[#1]#2#3{%
  \reverse\iffcs{ltr@anchor_objnum:#2}
    {\pdfobj reserveobjnum%
     \xdefcs{ltr@anchor_objnum:#2}{\the\pdflastobj}}%
  \ltr@link_create{#1}{\usecs{ltr@anchor_objnum:#2} 0 R}{#3}%
  }
\def\gotoA{%
  \ifnextnospace[{\ltr@gotoA}{\ltr@gotoA[none]}%
  }
\def\ltr@gotoA[#1]#2#3{%
  \anchor{ltr@#2_back}%
  \ltr@goto[#1]{#2}{#3}%
  }
\def\gotoB{%
  \ifnextnospace[{\ltr@gotoB}{\ltr@gotoB[none]}%
  }
\def\ltr@gotoB[#1]#2#3{%
  \anchor{#2}%
  \ltr@goto[#1]{ltr@#2_back}{#3}%
  }  
\def\showorhide{%
  \ifnextnospace[{\ltr@showorhide}{\ltr@showorhide[none]}%
  }
\def\ltr@showorhide[#1]#2#3{%
  \ifsuffix,{#2}
    {\ltr@showorhide_loop{}{}{}{#2}}
    {\ltr@showorhide_loop{}{}{}{#2,}}%
  \ltr@link_create{#1}{\ltr@temp 0 R}{#3}%
  }
\newfor\ltr@showorhide_loop{3}#4=#5,{%
  \ltr@showorhide_objloop{#5 }%
  \passtrim{#4}\ifstring{on}
    {\passarguments{#1#5 }{#2}{#3}}
    {\passtrim{#4}\ifstring{off}
      {\passarguments{#1}{#2#5 }{#3}}
      {\passtrim{#4}\ifstring{toggle}
        {\passarguments{#1}{#2}{#3#5 }}
        {\ltr@error{Unkown attribute `#4' in \string\showorhide}}}}%
  }[\immediate\pdfobj{%
      << /S/SetOCGState
         /State [/ON \ltr@showorhide_objects{#1} /OFF \ltr@showorhide_objects{#2} /Toggle \ltr@showorhide_objects{#3}] >>}%
    \edef\ltr@temp{\the\pdflastobj\spacecs}]
\newfornoempty\ltr@showorhide_objloop#1 {%
  \reverse\iffcs{ltr@step_objnum:#1_\the\slideno}
    {\pdfobj reserveobjnum 
     \xdefcs{ltr@step_objnum:#1_\the\slideno}{\the\pdflastobj\spacecs}}%
  }
\newfornoempty\ltr@showorhide_objects#1 {%
  \usecs{ltr@step_objnum:#1_\the\slideno}0 R
  }
%
\def\showbookmarks{%
  \ifnextnospace[{\ltr@showbookmarks}{\ltr@showbookmarks[none]}%
  }
\def\ltr@showbookmarks[#1]#2{%
  \reverse\iffcommand\ltr@bookmark_menuobject{%
    \pdfobj reserveobjnum
    \xdef\ltr@bookmark_menuobject{\the\pdflastobj\spacecs}}%  
  \ltr@link_create{#1}{\ltr@bookmark_menuobject 0 R}{#2}%
  }
%
\def\ltr@bookmark_list{}
\def\ltr@bookmark_stack{}
\def\createbookmark{%
  \ifnextnospace[{\ltr@createbookmark}{\ltr@createbookmark[]}%
  }
\newcount\ltr@bookmark_count
\def\ltr@createbookmark[#1]#2{%
  \ifnextnospace[
    {\ltr@bookmark_create{#1}{#2}}
    {\global\advance\ltr@bookmark_count1
     \ltr@bookmark_create{#1}{#2}[ltr@bookmark_number:\the\ltr@bookmark_count]}%
  }
\def\ltr@bookmark_create#1#2[#3]#4{%
  \reverse\iffcommand\ltr@bookmark_menuobject{%
    \pdfobj reserveobjnum
    \xdef\ltr@bookmark_menuobject{\the\pdflastobj\spacecs}%
    }%
  \passexpanded{\ltr@bookmark_add{#2}{{#4}{\the\slideno,\the\ltr@activesteps_count,{#3}}{#1}}}\ltr@bookmark_stack
  }
\bgroup
\setcatcodes{\{\}=12,<=1,>=2}
\gdef\ltr@leftbrace<{>
\gdef\ltr@rightbrace<}>
\egroup
\def\ltr@bookmark_submenu#1{%
  \reverse\iffemptystring{#1}{, oSubMenu: [#1]}%
  }
\newfor\ltr@bookmark_add{2}#3,{%
  \straightenif{ifdim}{#1pt>#3pt }
    {\global\eaddright\ltr@bookmark_list{#2\ltr@leftbrace}
     \retrieverest{\ltr@bookmark_addtostack{#1,#3,}}}
    {\global\eaddright\ltr@bookmark_list{\ltr@rightbrace,}}
  }[\global\eaddright\ltr@bookmark_list{#2\ltr@leftbrace}
    \ltr@bookmark_addtostack{#1,}{}]
\def\ltr@bookmark_addtostack#1#2{\gdef\ltr@bookmark_stack{#1#2}}

%
%
% JOB END
% Creates the bookmarks and fills the catalog with the OCGs.
% The default end job is maintained, except in TeX. 
%
\newfor\ltr@bookmark_endlist#1,{%
  \eaddright\ltr@bookmark_list{\ltr@rightbrace,}%
  }
\newfor\ltr@bookmark_process#1#2#3#4,{%
  \ltr@bookmark_subcount{0}{#1}{#2}{#3}{#4}%
  \reverse\iffemptystring{#4}{\ltr@bookmark_process{#4}}%
  }
\newfor\ltr@bookmark_subcount{4}#5,{%
  \passarguments{#1+1}{#2}{#3}{#4}
  }[\def\ltr@bookmark_sign{-}%
    \def\ltr@bookmark_options{}%
    \ltr@option_launchloop{bookmark}{#4}%
    \ltr@bookmark_anchor#3,%
    \pdfoutline attr {\ltr@bookmark_options} user {\ltr@bookmark_action#3,} count \ltr@bookmark_sign\the\numexpr(#1)  {#2}%
   ]
\def\ltr@bookmark_useatom#1{%
  \ifstring{#1}{italic}
    {\eaddright\ltr@bookmark_options{/F 1 }}
    {\ifstring{#1}{bold}
       {\eaddright\ltr@bookmark_options{/F 2 }}
       {\ifstring{#1}{bolditalic}
         {\eaddright\ltr@bookmark_options{/F 3 }}
         {\ifstring{#1}{open}
          {\def\ltr@bookmark_sign{}}
          {\ifstring{#1}{closed}
             {\def\ltr@bookmark_sign{-}}
             {\reverse\iffstring{#1}{nosubmenutext}
               {\eaddright\ltr@bookmark_options{/C [#1]}}}}}}}%
  }
\def\ltr@bookmark_action#1,#2,#3,{\ltr@anchor{#1}{#2}}
\def\ltr@bookmark_anchor#1,#2,#3,{%
  \immediate\pdfobj\iffcs{ltr@anchor_objnum:#3}{useobjnum \usecs{ltr@anchor_objnum:#3}}{\ltr@anchor{#1}{#2}}%
  \reverse\iffcs{ltr@anchor_objnum:#1}{\xdefcs{ltr@anchor_objnum:#1}{\the\pdflastobj\spacecs}}%
  }
\newstring{nosubmenutext}
\newfor\ltr@bookmark_javaprocess{1}#2#3#4#5,{%
  \reverse\iffemptystring{#1}{, }%
  {cName: "#2"%
   \ifemptystring{#5}
     {, cReturn: "#3"}
     {, oSubMenu: [\ifcontains{nosubmenutext}{#4}
                     {\ltr@bookmark_javaprocess{}{#5}}
                     {\ltr@bookmark_javaprocess{}{{\ltr@usevalueor job:menutext;{***}}{#3}{}{},#5}}]%
     }}%
  \passarguments{*}
  }
\def\ltr@job_end{%
  \reverse\iffemptycommand\ltr@bookmark_list{%
    \expandafter\ltr@bookmark_endlist\expandafter{\ltr@bookmark_stack}
    \bgroup
      \setcatcodes{_@=11}
      \scantokens\expandafter{\expandafter\gdef\expandafter\ltr@bookmark_list\expandafter{\ltr@bookmark_list}}%
    \egroup
    \expandafter\ltr@bookmark_process\expandafter{\ltr@bookmark_list}
    \edef\ltr@bookmark_list{\passexpanded{\ltr@bookmark_javaprocess{}}\ltr@bookmark_list}
    \immediate\pdfobj useobjnum \ltr@bookmark_menuobject{%
      << /S/JavaScript
         /JS (var bookmark = app.popUpMenuEx(\ltr@bookmark_list);
              if (bookmark != null)
                 {var bookmark = bookmark.split(",");
                  \ltr@ifvalue job:autofullscreen; = true {app.fs.isFullScreen = true; }{}%
                  this.gotoNamedDest("ltr@linktopage_" + bookmark[0])};)
         % If the two JS actions are executed together, the timing is wrong and the second
         % one has no effect. Hence its isolation in a /Next action.
         /Next << /S/JavaScript
           /JS (if (app.fs.isFullScreen) { if (bookmark != null) {for (var i=0; i<bookmark[1];i++) {app.execMenuItem("NextPage")}} } ) >>
       >>
      }}
  \pdfcatalog{%
    \iffcommand\ltr@job_background\ltr@job_background
    /OCProperties <<
      /OCGs [\ltr@catalog_OCGs] 
      /D << /Order [\ltr@order_OCGs] /BaseState/OFF /ON [\ltr@visible_OCGs] >>
    >>}
  \ltr@end_job
  }
\ifnum\formatnumber<3
  \let\ltr@end_job\end
  \let\bye\ltr@job_end % plain and eplain
\else
  \ifnum\formatnumber=3
    \let\ltr@end_job\normalend
    \let\normalend\ltr@job_end % ConTeXt
  \else
    \let\ltr@end_job\@@end
    \AtEndDocument{\ltr@job_end}% LaTeX
  \fi
\fi