KOMA-Script Documentation Project

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Chapter thumbs with scrpage2
%
 
% Safty first
\@ifundefined{chapter}{\let\chapter\undefined
  \chapter must be defined to use chapter thumbs!}{%
 
% Two new commands for the width and height of the boxes with the
% chapter number at the thumbs (use of commands instead of lengths
% for sparing registers)
\newcommand*{\chapterthumbwidth}{2em}
\newcommand*{\chapterthumbheight}{1em}
 
% Two new commands for the colors of the box background and the
% chapter numbers of the thumbs
\newcommand*{\chapterthumbboxcolor}{black}
\newcommand*{\chapterthumbtextcolor}{white}
 
% New command to set a chapter thumb. I'm using a group at this
% command, because I'm changing the temporary dimension \@tempdima
\newcommand*{\putchapterthumb}{%
  \begingroup
    \Large
    % calculate the horizontal possition of the right paper border
    % (I ignore \hoffset, because I interprete \hoffset moves the page
    % at the paper e.g. if you are using cropmarks)
    \setlength{\@tempdima}{\@oddheadshift}% (internal from scrpage2)
    \setlength{\@tempdima}{-\@tempdima}%
    \addtolength{\@tempdima}{\paperwidth}%
    \addtolength{\@tempdima}{-\oddsidemargin}%
    \addtolength{\@tempdima}{-1in}%
    % putting the thumbs should not change the horizontal
    % possition
    \rlap{%
      % move to the calculated horizontal possition
      \hspace*{\@tempdima}%
      % putting the thumbs should not change the vertical
      % possition
      \vbox to 0pt{%
        % calculate the vertical possition of the thumbs (I ignore
        % \voffset for the same reasons told above)
        \setlength{\@tempdima}{\chapterthumbwidth}%
        \multiply\@tempdima by\value{chapter}%
        \addtolength{\@tempdima}{-\chapterthumbwidth}%
        \addtolength{\@tempdima}{-\baselineskip}%
        % move to the calculated vertical possition
        \vspace*{\@tempdima}%
        % put the thumbs left so the current horizontal possition
        \llap{%
          % and rotate them
          \rotatebox{90}{\colorbox{\chapterthumbboxcolor}{%
              \parbox[c][\chapterthumbheight][c]{\chapterthumbwidth}{%
                \centering
                \textcolor{\chapterthumbtextcolor}{%
                  \strut\thechapter}\\
              }%
            }%
          }%
        }%
        % avoid overfull \vbox messages
        \vss
      }%
    }%
  \endgroup
}
 
% New command, which works like \lohead but also puts the thumbs (you
% cannot use \ihead with this definition but you may change this, if
% you use more internal scrpage2 commands)
\newcommand*{\loheadwithchapterthumbs}[2][]{%
  \lohead[\putchapterthumb#1]{\putchapterthumb#2}%
}
 
% initial use
\loheadwithchapterthumbs{}
\pagestyle{scrheadings}
 
}
%
%  End of chapter thumbs with scrpage2
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%