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Como colocar uma moldura colorida ao redor de uma legenda no longtable?

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Como colocar uma moldura colorida ao redor de uma legenda no longtable?

Gostaria de colocar uma moldura colorida (por exemplo, com tcolorboxpacote) ao redor da legenda de uma tabela longa, que coloquei no arquivo \endlastfoot. Usei a resposta para esta pergunta:Legenda e figura em caixa, com legenda coloridapara minhas outras figuras/tabelas, mas não consigo fazê-lo funcionar no ambiente longtable. Eu usei a resposta para esta perguntaPinte uma mesa longapara tentar colorir a legenda multilinha, mas não consegue torná-la bonita e emoldurada.

\documentclass[a4paper, 12pt]{report}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english,ngerman]{babel}
\usepackage[margin=2cm]{geometry}
\setlength{\parindent}{5mm}

%Tabels:
\usepackage{xcolor}
\usepackage{colortbl}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{longtable}
\usepackage{caption}

%Adjusted Command to color the caption from https://tex.stackexchange.com/questions/345589/color-a-longtable/345602#345602
\definecolor{lightGray}{gray}{0.95}
\def\ColorTabelHeader{lightGray}

\newcommand*{\BeginHeadcolor}{%
  \arrayrulecolor{gray}\toprule[0.7pt]
  \rowcolor{\ColorTabelHeader}%
  \noalign{%
    \kern-\belowrulesep
    \begingroup
      \color{\ColorTabelHeader}\hrule height\belowrulesep
    \endgroup
  }%
}
\newcommand*{\EndHeadcolor}{%
  \noalign{%
    \begingroup
      \color{\ColorTabelHeader}%
      \hrule height\aboverulesep
    \endgroup
    \kern-\aboverulesep
  }%
  \toprule[0.7pt] \arrayrulecolor{black}
}
\makeatletter
\newcommand*{\LTBeginHeadcolor}{%
  \arrayrulecolor{gray}\toprule[0.7pt]
    \vadjust pre{\kern-\belowrulesep}%
    \begingroup
      \color{\ColorTabelHeader}%
      \leaders\hrule height\belowrulesep\hfill
    \endgroup
  \cr
  \rowcolor{\ColorTabelHeader}%
}
\newcommand*{\LTEndHeadcolor}{%
  \multispan\LT@cols
    \begingroup
      \color{\ColorTabelHeader}%
      \leaders\hrule height\aboverulesep\hfill
    \endgroup
  \cr
  \noalign{%
    \kern-\aboverulesep
  }%
 \toprule[0.7pt] \arrayrulecolor{black}
}
\makeatother


% Settings for Longtable
\setlength\LTleft{0pt} 
\setlength\LTright{0pt}
\setlength{\LTcapwidth}{\columnwidth}
% To make it load faster
\setcounter{LTchunksize}{50}

\begin{document}

\renewcommand\arraystretch{0.8}
\begin{longtable}{c|c >{\columncolor[gray]{.9}}c c >{\columncolor[gray]{.9}}c c}
\LTBeginHeadcolor
\caption[]{\textbf{Caption:}
some information describing the content}\\
\LTEndHeadcolor \endfoot
\LTBeginHeadcolor
\caption[]{\textbf{Caption:}
this is a very long caption with some additional information regarding the parameters.\label{tab:Sample}}\\*
\rowcolor{\ColorTabelHeader}
\multicolumn{6}{c}{\parbox{\LTcapwidth}{{\footnotesize This Information is so long, that I had to put it in an extra paragraph with a smaller font}}}\\
\LTEndHeadcolor
\endlastfoot 
    \toprule
   \multirow{2}[2]{*}[2mm]{\textbf{Parameter}} &      & \textbf{BLH} & \textbf{0h} & \textbf{4h} & \textbf{8h} \\
          &       & Median (SD) & Median (SD) & Median (SD) & Median (SD) \\
    \midrule  \endfirsthead
     \toprule    
   \multirow{2}[2]{*}[2mm]{\textbf{Parameter}} &      & \textbf{BLH} & \textbf{0h} & \textbf{4h} & \textbf{8h} \\
          &       & Median (SD) & Median (SD) & Median (SD) & Median (SD) \\
    \midrule     \endhead
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \\[0,3cm]    
    \bottomrule
\end{longtable}%%


\end{document}

Responder1

Graças ao Axel encontrei uma possível solução para o meu problema. Como sou relativamente novo no Latex e não estou acostumado com Macros, conte-me sobre quaisquer erros que cometi ou apenas edite minha resposta:

O código para o LTcaptionbox com moldura colorida:

\usepackage[many]{tcolorbox}

    \makeatletter
    \newtcolorbox{LTcaptionbox}[7][]{enhanced, colframe=gray, colback=gray!30, arc=0pt, outer arc=0pt, boxrule=0.7pt, before={}, #1}
    \DeclareCaptionOption{stuffforbox}{\def\caption@stuffforbox{#1}}

    \DeclareCaptionBox{myLTbox}{%
      \begin{LTcaptionbox}[code={\pgfkeysalsofrom{\caption@stuffforbox}}]
        #2%
      \end{LTcaptionbox}%
    }
    \makeatother
    \captionsetup[longtable]{stuffforbox={}, box={myLTbox}, slc=off}

E minha tabela editada (adicionei o pacote 'tabu' para preencher a página inteira e ajustei '\bottomrule' e o LTCaptionbox para a mesma largura)

\documentclass[a4paper, 12pt]{report}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english,ngerman]{babel}
\usepackage[margin=2cm]{geometry}
\setlength{\parindent}{5mm}

%Tabels:
\usepackage{xcolor}
\usepackage{colortbl}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{longtable}
\usepackage{caption}
\usepackage{tabu}


\usepackage[many]{tcolorbox}

\makeatletter
\newtcolorbox{LTcaptionbox}[7][]{enhanced, colframe=gray, colback=gray!30, arc=0pt, outer arc=0pt, boxrule=0.7pt, before={}, #1}
\DeclareCaptionOption{stuffforbox}{\def\caption@stuffforbox{#1}}

\DeclareCaptionBox{myLTbox}{%
  \begin{LTcaptionbox}[code={\pgfkeysalsofrom{\caption@stuffforbox}}]
    #2%
  \end{LTcaptionbox}%
}
\makeatother
\captionsetup[longtable]{stuffforbox={}, box={myLTbox}, slc=off}

% Settings for Longtable
\setlength\LTleft{0pt} 
\setlength\LTright{0pt}
\setlength{\LTcapwidth}{\glueexpr(\textwidth-10mm-1,4pt)\relax} % minus Distance text- to outer edge of the bounding-box on both sides
% To make it load faster
\setcounter{LTchunksize}{50}

\begin{document}



\begin{longtabu}{X|X X X X X}
\caption[]{\textbf{Caption:} some information describing the content}\endfoot
\caption[CaptionLOT]{\textbf{Caption:} this is a very long caption with some additional information regarding the parameters.\label{tab:Sample}\\*
{\footnotesize This Information is so long, that I had to put it in an extra paragraph with a smaller font}}
\endlastfoot 
    \toprule
   \multirow{2}[2]{*}[2mm]{\textbf{Parameter}} &      & \textbf{BLH} & \textbf{0h} & \textbf{4h} & \textbf{8h} \\
          &       & Median (SD) & Median (SD) & Median (SD) & Median (SD) \\
    \midrule  \endfirsthead
     \toprule    
   \multirow{2}[2]{*}[2mm]{\textbf{Parameter}} &      & \textbf{BLH} & \textbf{0h} & \textbf{4h} & \textbf{8h} \\
          &       & Median (SD) & Median (SD) & Median (SD) & Median (SD) \\
    \midrule     \endhead
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\
    Parameter & Group1 & 1 & 2 & 3 & 4 \\*
    {[unit]} & Group2 & 1 & 2 & 3 & 4 \vspace{0,3cm}\\    
    \bottomrule \addlinespace[1pt]
\end{longtabu}%%


\end{document}

PS: Não consegui usar '\columncolor' com as colunas X de 'Longtabu'. Alguém sabe uma possível solução para este problema?
Se você quiser manter o ambiente 'Longtable', basta usar:

\newlength\q
\setlength\q{\dimexpr 0.166\textwidth -2\tabcolsep\relax}

e

\begin{longtable}{p{\q}|p{\q} >{\columncolor[gray]{.95}\centering\arraybackslash}p{\q} >{\centering\arraybackslash}p{\q} >{\columncolor[gray]{.95}\centering\arraybackslash}p{\q} >{\centering\arraybackslash}p{\q}}

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