% chapterthumb.sty
% Copyright 2008 Markus Kohm
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is Markus Kohm.
%
% This work consists of this file only.
%-----------------------------------------------------------------------
\ProvidesPackage{chapterthumb}%
 [2016/02/01 v0.3a unsupported LaTeX package]
\ProcessOptions\relax
\RequirePackage{graphicx,color}
\RequirePackage{scrlayer}
\newcommand*{\firstchapterthumbskip}{.05\paperheight}
\newcommand*{\lastchapterthumbskip}{\firstchapterthumbskip}
\newcommand*{\chapterthumbheight}{2em}
\newcommand*{\chapterthumbwidth}{.2\paperheight}
\newcommand*{\chapterthumbskip}{.1\paperheight}
\newcommand*{\chapterthumbboxcolor}{black}
\newcommand*{\chapterthumbcolor}{white}
\newcommand*{\chapterthumbformat}{\@chapapp~\thechapter}
\newkomafont{chapterthumb}{\normalfont\Large\sffamily}
\newcommand*{\chapterthumbbox}{%
 \if@mainmatter
   \ifnum\value{chapter}>\z@
     \ifnum \value{chapterthumb}<\z@
     \else
       \begingroup
         \protected@edef\reserved@a{\chapterthumbformat}%
         \ifx\reserved@a\lastchapterthumbformat\else
           \stepcounter{chapterthumb}%
           \global\let\lastchapterthumbformat\reserved@a
         \fi
         \@tempcnta=\numexpr
           \dimexpr
             \paperheight
             -\firstchapterthumbskip
             -\chapterthumbwidth
             -\lastchapterthumbskip
           \relax / \dimexpr
                      \chapterthumbskip
                    \relax
           +1
         \relax
         \ifnum \value{chapterthumb}<\@tempcnta
         \else
           \setcounter{chapterthumb}{0}%
         \fi
         \vspace*{%
           \dimexpr
             \firstchapterthumbskip
             + ( \chapterthumbskip )
               * \value{chapterthumb}%
             - \baselineskip
           \relax
         }\par
         \hfill
         \makebox[0pt][r]{%
           \rotatebox[origin=tl]{90}{%
             \setlength{\fboxsep}{0pt}%
             \colorbox{\chapterthumbboxcolor}{%
               \parbox[c][\chapterthumbheight][c]%
               {\chapterthumbwidth}{%
                 \centering
                 \color{\chapterthumbcolor}%
                 \usekomafont{chapterthumb}{%
                   \chapterthumbformat
                 }}}}}%
       \endgroup
     \fi
   \fi
 \fi
}
\newcounter{chapterthumb}
\setcounter{chapterthumb}{10000}
\newcommand*{\lastchapterthumbformat}{\relax}
\DeclareNewLayer[%
 background,%
 oddpage,%
 rightmargin,%
 contents=\chapterthumbbox
]{chapterthumb}
\endinput
%%% Local Variables:
%%% mode: latex
%%% TeX-master: "chapterthumbexample"
%%% End:

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