Wie TikZ-Bild und Listing nebeneinander vertikal zentrieren?

\documentclass{scrartcl}

\usepackage{listings}
\usepackage{tikz}
\usepackage{xcolor}
\usepackage{subfig}
\usepackage{filecontents}

\lstset{numbers=none,frame=none,backgroundcolor=,basicstyle=\ttfamily    \footnotesize,captionpos=b,escapeinside=    {@}{@},aboveskip=7pt,abovecaptionskip=3pt,belowskip=3pt,boxpos=c,showspaces=false,showtabs=false,tabsize=4,breaklines=true,columns=flexible,mathescape}
% RoleModel
\lstdefinelanguage{Roles} 
{keywords={RoleModel, ROLE},keywords=[2]{input, super, transitive, reflexive,     optional},morestring=[s]{[}{]}} 
\lstdefinestyle{Roles} {language=Roles,keywordstyle=\color{role}\bfseries,keywordstyle=    [2]\color{roleKeyword}}

\usetikzlibrary{positioning}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{shapes}
\usetikzlibrary{graphs}
\usetikzlibrary{quotes}

\begin{document}

\definecolor{role}{cmyk}{1.0, 0.417, 0.0, 0.247}
\definecolor{roleKeyword}{cmyk}{0.3, 0.7, 0.0, 0.373}

\tikzset{
    role/.style = {rounded rectangle, minimum size=6mm, very thick, draw=role, top     color=white,bottom color=role!20, font=\sffamily\scriptsize,align=center,text=black},
    skip loop/.style = {to path={-- ++(0,#1) -| (\tikztotarget)}},
    hv/.style = {to path={-| (\tikztotarget) \tikztonodes}},
    vh/.style = {to path={|- (\tikztotarget) \tikztonodes}},
    comp/.style = {Diamond-},
    ass/.style = {-{Straight Barb[angle'=45,round]}},
    imp/.style = {-{Triangle[open,length=7pt]}},
    proh/.style = {{Bar[sep=1pt]}-{Bar[sep=1pt]}}
}

\begin{filecontents*}{repres.role}
RoleModel ExtractX { 
  ROLE OrigContainer; 
  input ROLE Extractee; 
  ROLE NewContainer (newName); 
  ROLE ContainerContainer; 
  transitive : OrigContainer [1..1] 
    <>- Extractee extracts [0..*]; 
  transitive : NewContainer [1..1] 
    <>- Extractee moved [0..*]; 
  transitive : ContainerContainer [1..1] 
    <>- NewContainer target [1..1]; 
  transitive : ContainerContainer [1..1] 
    <>- OrigContainer source [1..*]; 
  transitive : OrigContainer [1..*] 
    -- NewContainer reference [1..*];   
}
\end{filecontents*}

\begin{figure}
    \centering
    \subfloat[Graphical representation.]{
        \label{subfig:RolesGraph}
        \begin{tikzpicture}[node distance=9mm and 0mm,thick,black!50,every edge/.style=    {rounded corners,draw=black!50,text=black,font=\sffamily\scriptsize,near end}]
            \node[role] (ContainerContainer) {ContainerContainer};
            \node[role] (OriginalContainer) [below left=of ContainerContainer]     {OriginalContainer};
            \node[role] (NewContainer) [below right=of ContainerContainer] {NewContainer};
            \node[role] (Extractee) [below right=of OriginalContainer,xshift=15pt]     {Extractee};
            \path
                (ContainerContainer) edge[comp,hv,"target"] (NewContainer)
                (ContainerContainer) edge[comp,hv,"source"] (OriginalContainer)
                (NewContainer) edge[comp,vh,"moved"] (Extractee)
                (OriginalContainer) edge[ass] node[above,xshift=-5pt] {reference}     (NewContainer)
                (OriginalContainer) edge[comp,vh] node[below] {extracts}     (Extractee);

        \end{tikzpicture}
    }
    \qquad  
    \subfloat[Textual representation.]{
        \label{subfig:RolesText}
        \parbox{0.45\textwidth}    {\lstinputlisting[style=Roles,numbers=none,frame=none,backgroundcolor=,basicstyle=\ttfamily    \footnotesize]{repres.role}}
    }
    \caption{Different representations.}
    \label{fig:representations}
\end{figure}

\end{document}