[Tex/LaTex] convert titlesec code to something KOMA-script like

koma-script

I know that it is not a good idea to use titlesec together with KOMA script, but it worked in the past. Now it does not work and since I rely on KOMA script I would like to replace the remaining titlesec code with something more generic or at least KOMA script compatible:

%--> chapter with 'chapter' + number + rule + name + rule
% --------------------------------
\titleformat{\chapter}[display]               % {command}[shape]
  {\usekomafont{chapter}\Large \color{black}} % format
  {\LARGE\MakeUppercase{\chaptertitlename}%   % label
   \Huge~\thechapter \filright}%  
  {1pt}                                          % sep (from chapternumber)
  {%
   \titlerule \vspace{0.9pc} % 
   \filright 
   \color{sectioncolor}   
  }                                           % (before chaptertitle and after)
  [\color{black} \vspace{0.9pc} \filright {\titlerule}] %
% --------------------------------

%--> part with 'PART' + number at frame and name inside frame
% --------------------------------
\titleformat{\part}[frame]
  {\usekomafont{part}\Large\color{black}\centering}    % format
  % label: PART I
  {\enspace \LARGE\MakeUppercase{\partname}%           
     \centering \Huge~\thepart \enspace }%  
  % sep (from partnumber)
  {1.5\baselineskip}
  % (before chaptertitle and after)
  {\color{sectioncolor}%
  \filcenter}          
% --------------------------------

% spacing before and after sections
\titlespacing*{\section}{0pt}{*2.0}{*0.5}
\titlespacing*{\subsection}{0pt}{*1.5}{*0.5}
\titlespacing*{\subsubsection}{0pt}{*1.5}{*0.5}

I have no code prepared simply because this is to me LateX or KOMA internal code I do not know well enough.

The code is used in my template, thus the solution is going to be used by many other people as well and public anyway.

EDIT:
MWE

\documentclass{scrbook}

\usepackage{xcolor}
\usepackage{titlesec}

% --------------------------------
\titleformat{\chapter}[display]               % {command}[shape]
  {\usekomafont{chapter}\Large \color{black}} % format
  {\LARGE\MakeUppercase{\chaptertitlename}%   % label
   \Huge~\thechapter \filright}%  
  {1pt}                                          % sep (from chapternumber)
  {%
   \titlerule \vspace{0.9pc} % 
   \filright 
   \color{blue}
  }                                           % (before chaptertitle and after)
  [\color{black} \vspace{0.9pc} \filright {\titlerule}] %
% --------------------------------

%--> part with 'PART' + number at frame and name inside frame
% --------------------------------
\titleformat{\part}[frame]
  {\usekomafont{part}\Large\color{black}\centering}    % format
  % label: PART I
  {\enspace \LARGE\MakeUppercase{\partname}%           
     \centering \Huge~\thepart \enspace }%  
  % sep (from partnumber)
  {1.5\baselineskip}
  % (before chaptertitle and after)
  {\color{blue}%
  \filcenter}          

% --------------------------------

% spacing before and after sections
\titlespacing*{\section}{0pt}{*2.0}{*0.5}
\titlespacing*{\subsection}{0pt}{*1.5}{*0.5}
\titlespacing*{\subsubsection}{0pt}{*1.5}{*0.5}

\begin{document}

\part{Part Title}

\chapter{Introduction}

\subsection*{title}

\subsubsection*{title}

\end{document}

Best Answer

Second Update Since version 3.25 KOMA-Script provides \partlineswithprefixformat, too:

\documentclass[chapterprefix,numbers=noenddot]{scrbook}[2018/03/30]% needs version 3.25 or newer
\usepackage{xcolor}

% part
\RedeclareSectionCommand[
  innerskip=0pt,
  font=\mdseries\Large,
  prefixfont=\LARGE,
]{part}

\renewcommand*{\partformat}{%
  \raisebox{-.5\dp\strutbox}{%
    \makebox[0pt]{%
      \setlength\fboxsep{.5em}%
      \colorbox{white}{%
        \partname\nobreakspace{\Huge\thepart\autodot}%
}}}}

\renewcommand*\partlineswithprefixformat[3]{% needs KOMA-Script version 3.25 or newer
  \ifstr{#1}{part}{%
    \raggedpart
    \fbox{%
      \parbox[t][\dimexpr\height+3\normalbaselineskip][c]
        {\dimexpr\textwidth-2\fboxsep-2\fboxrule\relax}
        {\centering \color{blue}#3}%
    }\nolinebreak%
    \ifnumbered{part}{\hspace*{-.5\textwidth}#2}{\linebreak}%
  }{%
    #2#3
  }%
}
\renewcommand*\raggedpart{\raggedright}

% chapter
\RedeclareSectionCommand[
  innerskip=1pt,
  font=\mdseries\Large,
  prefixfont=\LARGE,
]{chapter}

\renewcommand*{\chapterformat}{%
  \mbox{\MakeUppercase{%
    \chapappifchapterprefix{\nobreakspace}}{\Huge\thechapter\autodot}%
    \IfUsePrefixLine{}{\enskip}}%
}

\renewcommand\chapterlineswithprefixformat[3]{%
  \ifstr{#1}{chapter}{%
    #2\nobreak%
    \vspace*{\dimexpr-\ht\strutbox}%
    \rule[-\dp\strutbox]{\textwidth}{.4pt}\\*[.9pc]%
    {\color{blue}#3}%
    \vspace*{\dimexpr-\ht\strutbox-\dp\strutbox+.9pc}\nobreak%
    \rule[-\dp\strutbox]{\textwidth}{.4pt}%
    \par\nobreak%
  }{%
    #2#3%
  }%
}

% other section levels
\RedeclareSectionCommand[
  beforeskip=-2ex plus -.6ex minus -0.12ex,
  afterskip=.5ex plus .05ex
]{section}

\RedeclareSectionCommands[
  beforeskip=-1.5ex plus -.45ex minus -0.09ex,
  afterskip=.5ex plus .05ex
]{subsection,subsubsection}

\begin{document}
\addpart{Part without number}
\tableofcontents
\part{Part Title}
\chapter{Introduction}
\subsection*{title}
\subsubsection*{title}
\part{Second title}
\end{document}

Update

It is also possible to use style=chapter for parts. Then \chapterlineswithprefixformat can also be used to set the layout for the part titles.

\documentclass[chapterprefix,numbers=noenddot]{scrbook}
\usepackage{xcolor}

% part and chapter
\RedeclareSectionCommand[
  style=chapter,
  beforeskip=-1sp,
  afterskip=1sp,
  innerskip=0pt,
  font=\mdseries\Large,
  prefixfont=\LARGE,
]{part}

\RedeclareSectionCommand[
  innerskip=1pt,
  font=\mdseries\Large,
  prefixfont=\LARGE,
]{chapter}

\renewcommand*{\partformat}{%
  \raisebox{-.5\dp\strutbox}{%
    \makebox[0pt]{%
      \setlength\fboxsep{.5em}%
      \colorbox{white}{%
        \partname\nobreakspace{\Huge\thepart\autodot}%
}}}}

\renewcommand*{\chapterformat}{%
  \mbox{\MakeUppercase{%
    \chapappifchapterprefix{\nobreakspace}}{\Huge\thechapter\autodot}%
    \IfUsePrefixLine{}{\enskip}}%
}

\renewcommand\chapterlineswithprefixformat[3]{%
  \ifstr{#1}{chapter}{%
    #2\nobreak%
    \vspace*{\dimexpr-\ht\strutbox}%
    \rule[-\dp\strutbox]{\textwidth}{.4pt}\\*[.9pc]%
    {\color{blue}#3}%
    \vspace*{\dimexpr-\ht\strutbox-\dp\strutbox+.9pc}\nobreak%
    \rule[-\dp\strutbox]{\textwidth}{.4pt}%
    \par\nobreak%
  }{%
    \ifstr{#1}{part}{%
      \null\vfil
      \fbox{%
        \parbox[t][\dimexpr\height+3\normalbaselineskip][c]
          {\dimexpr\textwidth-2\fboxsep-2\fboxrule\relax}
          {\centering \color{blue}#3}%
      }\nolinebreak%
      \ifnumbered{part}{\hspace*{-.5\textwidth}#2}{}%
      \vfil\newpage\partheademptypage
    }{%
      #2#3%
    }%
  }%
}

% other section levels
\RedeclareSectionCommand[
  beforeskip=-2ex plus -.6ex minus -0.12ex,
  afterskip=.5ex plus .05ex
]{section}

\RedeclareSectionCommands[
  beforeskip=-1.5ex plus -.45ex minus -0.09ex,
  afterskip=.5ex plus .05ex
]{subsection,subsubsection}

\begin{document}
\addpart{Part without number}
\tableofcontents
\part{Part Title}
\chapter{Introduction}
\subsection*{title}
\subsubsection*{title}
\part{Second title}
\end{document}

Original answer

Your code will work with titlesec version 2016/03/21 v2.10.2 and the prerelease of KOMA-Script 3.20. See Fehler bei Verwendung von titlesec (German).

But here is also a suggestion without titlesec.

You can use \RedeclareSectionCommand and \RedeclareSectionCommands to set the vertical skips before and after section headings.
To change the layout of the chapter titles redefine the commands \chapterformat and \chapterlineswithprefix. Note that I use option chapterprefix.
Unfortunaly there is no \partlineswithprefixformat yet. So I use TikZ to draw the frame around the part titles. Therefore the example needs two runs.

Code:

\documentclass[chapterprefix,numbers=noenddot]{scrbook}
\usepackage{xpatch}
\usepackage{tikz}

% part
\RedeclareSectionCommand[
  font=\mdseries\Large\color{blue},
  prefixfont=\usekomafont{part}\LARGE\color{black},
  expandtopt,
  innerskip=1\baselineskip
]{part}
\renewcommand*{\partformat}{%
  \tikz[remember picture]\node[inner ysep=0pt,inner xsep=.5em](partnumber)
    {{\MakeUppercase{\partname}\nobreakspace{\Huge\thepart\autodot}}};%
}

\xapptocmd{\partheadstartvskip}{%
  \ifunnumbered{part}
    {\tikz[remember picture]\coordinate(partstart);\\*[1.5\baselineskip]}
    {}%
}{}{}
\xpretocmd{\partheadendvskip}{%
  \vspace*{.5\baselineskip}%
  \noindent\ifnumbered{part}
    {\tikz[remember picture,overlay]\draw(partnumber)-|(0,0)--+(\textwidth,0)|-(partnumber);}
    {\tikz[remember picture,overlay]\draw(partstart)-|(0,0)--+(\textwidth,0)|-(partstart);}%
}{}{}

% chapter
\RedeclareSectionCommand[
  innerskip=1pt,
  font=\mdseries\Large,
  prefixfont=\LARGE,
]{chapter}

\renewcommand*{\chapterformat}{%
  \mbox{\MakeUppercase{%
    \chapappifchapterprefix{\nobreakspace}}{\Huge\thechapter\autodot}%
    \IfUsePrefixLine{}{\enskip}}%
}

\renewcommand\chapterlineswithprefixformat[3]{%
  #2\nobreak%
  \vspace*{\dimexpr-\ht\strutbox}%
  \rule[-\dp\strutbox]{\textwidth}{.4pt}\\*[.9pc]%
  {\color{blue}#3}%
  \vspace*{\dimexpr-\ht\strutbox-\dp\strutbox+.9pc}\nobreak%
  \rule[-\dp\strutbox]{\textwidth}{.4pt}%
  \par\nobreak%
}

% other section levels

\RedeclareSectionCommand[
  beforeskip=-2ex plus -.6ex minus -0.12ex,
  afterskip=.5ex plus .05ex
]{section}

\RedeclareSectionCommands[
  beforeskip=-1.5ex plus -.45ex minus -0.09ex,
  afterskip=.5ex plus .05ex
]{subsection,subsubsection}

\begin{document}
\addpart{Part without number}
\tableofcontents
\part{Part Title}
\chapter{Introduction}
\subsection*{title}
\subsubsection*{title}
\part{Second title}
\end{document}

Update in beginning of 2014

With recently published version 3.12 of KOMA-Script one will get a warning when compiling a document with titlesec:

Class scrartcl Warning: Usage of package `titlesec' together
(scrartcl)              with a KOMA-Script class is not recommended.
(scrartcl)              I'd suggest to use the package only
(scrartcl)              if you really need it, because it breaks several
(scrartcl)              KOMA-Script features, i.e., option `headings' and
(scrartcl)              the extended optional argument of the section
(scrartcl)              commands .

[Tex/LaTex] How to have titlesec-like behaviour in KOMA-Script

Add a \clearpage to each section:

\documentclass{scrartcl}
\addtokomafont{section}{\clearpage}
\begin{document}

\section{foo}foo
\section{bar}bar
\subsection{foooo} foooo
\section{baz}baz
\section{foobar}foobar

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Incompatibilities between KOMA-Script and titlesec

Update in beginning of 2014

[Tex/LaTex] How to have titlesec-like behaviour in KOMA-Script

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