Sstrhsrtj

In the code given below, if there is a page break for the tcolorbox, the left grey line that I wanted, disappears. If however, the tcolorbox is not broken, the left line is present.

Can you help me get the left grey line to also appear when the tcolorbox is broken? Thanks!

CODE

documentclass[a4paper, 10pt, oneside, fleqn, openright]{book}

usepackage[no-math]{fontspec}



usepackage{polyglossia}

setdefaultlanguage{french}

setotherlanguages{english}



newcommand{codeimg}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-a}}}$}

newcommand{codeimgpy}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-b}}}$}

newcommand{codeimgcpp}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-c}}}$}



usepackage{calc}

usepackage[usenames,dvipsnames,svgnames,table]{xcolor}

usepackage{pdfpages,graphicx}

usepackage{mdframed}

usepackage{listings}

usepackage{filecontents}

definecolor{mybluei}{RGB}{0,173,239}

definecolor{myblueii}{RGB}{63,200,244}

definecolor{myblueiii}{RGB}{199,234,253}

definecolor{light-gray}{gray}{0.92}



definecolor{mainColor}{RGB}{211, 47, 47} % some dark red



renewcommandlstlistingname{Code}

lstset{

    language=Python,

    numbers=left,

    numbersep= 7mm,

    numberstyle=color{Black},

    stepnumber=1,

    tabsize=3,

    breakatwhitespace=false,

    breaklines=true,

    captionpos=b,

    basicstyle=color{Black}ttfamily,

    commentstyle=color{LimeGreen},

    keywordstyle=color{BurntOrange}bfseries,

    stringstyle=color{WildStrawberry},

    keywords={var, func, extends},

    frame=leftline,

    framesep=0mm,

    xleftmargin=3mm,

    framesep=2mm, 

    framerule=0mm,

    abovecaptionskip=5mm,

    aboveskip=baselineskip,

    belowskip=baselineskip

}



usepackage{tcolorbox}

newcounter{data}

newcounter{result}

newcounter{pythoncode}

newcounter{cppcode}

newcounter{matlab}

tcbuselibrary{skins,breakable,listings}



newtcbinputlisting[use counter=matlab,list inside=matlab,number within=chapter]{inputmatlab}[3]{listing options={style=Matlab-editor},%

        enhanced,noparskip,breakable,colback=light-gray,colframe=DarkSlateGray,opacitybacktitle=.8,%

        fonttitle=bfseries,before upper={hspace*{-1em}codeimg~#2},%

    title after break={centeringfootnotesizeitshapestrut Matlab Code~thematlab~--~continued},%

     listing only,listing options={xleftmargin=-1mm,#1,style=Matlab-editor},

     after upper={centeringstrut {bfseries Matlab Code~thematlab:}~#2},

     frame hidden,arc=0pt,outer arc=0pt,boxrule=0pt,frame code={draw[gray,line width=2mm] ([xshift=-0.5pt]frame.north west) -- ([xshift=-0.5pt]frame.south west);},

     %

     listing file={#3},#1}



newtcbinputlisting[use counter=cppcode,list inside=cppcode,number within=chapter]{inputcppcode}[3]{listing options={language=C++},%

        enhanced,noparskip,breakable,colback=light-gray,colframe=DarkSlateGray,opacitybacktitle=.8,%

        fonttitle=bfseries,before upper={hspace*{-1em}codeimgcpp~#2},%

    title after break={centeringfootnotesizeitshapestrut C++ Code~thecppcode~--~continued},%

     listing only,listing options={xleftmargin=-1mm,#1,language=C++},

     after upper={centeringstrut {bfseries C++ Code~thecppcode:}~#2},

     frame hidden,arc=0pt,outer arc=0pt,boxrule=0pt,frame code={draw[gray,line width=2mm] ([xshift=-0.5pt]frame.north west) -- ([xshift=-0.5pt]frame.south west);},

     %

     listing file={#3},#1}



usepackage[numbered,framed]{matlab-prettifier}



begin{filecontents*}{sample.m}

% create a file for output

!touch testFile.txt

fid = fopen('testFile.text', 'w')

for i=1:10

  fprintf(fid,'%6.2f n', i);

end

end{filecontents*}



begin{filecontents*}{cppcodex.cpp}

#include <iostream>

using namespace std;



int main()

{

    int firstNumber, secondNumber, sumOfTwoNumbers;



    cout << "Enter two integers: ";

    cin >> firstNumber >> secondNumber;



    // sum of two numbers in stored in variable sumOfTwoNumbers

    sumOfTwoNumbers = firstNumber + secondNumber;



    // Prints sum

    cout << firstNumber << " + " <<  secondNumber << " = " << sumOfTwoNumbers;



    return 0;

}

end{filecontents*}



begin{document}



inputmatlab{Expansion Algorithm}{sample.m}



vspace*{7cm}



inputcppcode{Example C++ Code}{cppcodex.cpp}



end{document}

I don't know why your tex code doesn't work as expected.

I suggest a workaround using exras={frame code={draw[gray,line width=2mm] ([xshift=-0.5pt]frame.north west) -- ([xshift=-0.5pt]frame.south west);}} within tcolorbox options:

documentclass[a4paper, 10pt, oneside, fleqn, openright]{book}

usepackage[no-math]{fontspec}

usepackage{lipsum}

usepackage{polyglossia}

setdefaultlanguage{french}

setotherlanguages{english}



newcommand{codeimg}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-a}}}$}

newcommand{codeimgpy}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-b}}}$}

newcommand{codeimgcpp}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-c}}}$}



usepackage{calc}

usepackage[usenames,dvipsnames,svgnames,table]{xcolor}

usepackage{pdfpages,graphicx}

usepackage{mdframed}

usepackage{listings}

usepackage{filecontents}

definecolor{mybluei}{RGB}{0,173,239}

definecolor{myblueii}{RGB}{63,200,244}

definecolor{myblueiii}{RGB}{199,234,253}

definecolor{light-gray}{gray}{0.92}



definecolor{mainColor}{RGB}{211, 47, 47} % some dark red



renewcommandlstlistingname{Code}

lstset{

    language=Python,

    numbers=left,

    numbersep= 7mm,

    numberstyle=color{Black},

    stepnumber=1,

    tabsize=3,

    breakatwhitespace=false,

    breaklines=true,

    captionpos=b,

    basicstyle=color{Black}ttfamily,

    commentstyle=color{LimeGreen},

    keywordstyle=color{BurntOrange}bfseries,

    stringstyle=color{WildStrawberry},

    keywords={var, func, extends},

    frame=leftline,

    framesep=0mm,

    xleftmargin=3mm,

    framesep=2mm, 

    framerule=0mm,

    abovecaptionskip=5mm,

    aboveskip=baselineskip,

    belowskip=baselineskip

}



usepackage{tcolorbox}

newcounter{data}

newcounter{result}

newcounter{pythoncode}

newcounter{cppcode}

newcounter{matlab}

tcbuselibrary{skins,breakable,listings}



newtcbinputlisting[use counter=matlab,list inside=matlab,number within=chapter]{inputmatlab}[3]{listing options={style=Matlab-editor},%

        enhanced,noparskip,breakable,colback=light-gray,colframe=DarkSlateGray,opacitybacktitle=.8,%

        fonttitle=bfseries,before upper={hspace*{-1em}codeimg~#2},%

    title after break={centeringfootnotesizeitshapestrut Matlab Code~thematlab~--~continued},%

     listing only,listing options={xleftmargin=-1mm,#1,style=Matlab-editor},

     after upper={centeringstrut {bfseries Matlab Code~thematlab:}~#2},

     frame hidden,arc=0pt,outer arc=0pt,boxrule=0pt,

     extras={frame code={draw[gray,line width=2mm] ([xshift=-0.5pt]frame.north west) -- ([xshift=-0.5pt]frame.south west);}},

     %

     listing file={#3},#1}



newtcbinputlisting[use counter=cppcode,list inside=cppcode,number within=chapter]{inputcppcode}[3]{listing options={language=C++},%

        enhanced,noparskip,breakable,colback=light-gray,colframe=DarkSlateGray,opacitybacktitle=.8,%

        fonttitle=bfseries,before upper={hspace*{-1em}codeimgcpp~#2},%

    title after break={centeringfootnotesizeitshapestrut C++ Code~thecppcode~--~continued},%

     listing only,listing options={xleftmargin=-1mm,#1,language=C++},

     after upper={centeringstrut {bfseries C++ Code~thecppcode:}~#2},

     frame hidden,arc=0pt,outer arc=0pt,boxrule=0pt,

     extras={frame code={draw[gray,line width=2mm] ([xshift=-0.5pt]frame.north west) -- ([xshift=-0.5pt]frame.south west);}},

     %

     listing file={#3},#1}



usepackage[numbered,framed]{matlab-prettifier}



begin{filecontents*}{sample.m}

% create a file for output

!touch testFile.txt

fid = fopen('testFile.text', 'w')

for i=1:10

  fprintf(fid,'%6.2f n', i);

end



end{filecontents*}



begin{filecontents*}{cppcodex.cpp}

#include <iostream>

using namespace std;



int main()

{

    int firstNumber, secondNumber, sumOfTwoNumbers;



    cout << "Enter two integers: ";

    cin >> firstNumber >> secondNumber;



    // sum of two numbers in stored in variable sumOfTwoNumbers

    sumOfTwoNumbers = firstNumber + secondNumber;



    // Prints sum

    cout << firstNumber << " + " <<  secondNumber << " = " << sumOfTwoNumbers;



    return 0;

}

end{filecontents*}



begin{document}



inputmatlab{Expansion Algorithm}{sample.m}



vspace*{7cm}



inputcppcode{Example C++ Code}{cppcodex.cpp}



end{document}

Another workaround. Instead of frame hidden and boxrule=0pt, don't hide the frame and define a certain leftrule=... which survives in broken boxes.

documentclass[a4paper, 10pt, oneside, fleqn, openright]{book}

usepackage[no-math]{fontspec}



usepackage{polyglossia}

setdefaultlanguage{french}

setotherlanguages{english}



newcommand{codeimg}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-a}}}$}

newcommand{codeimgpy}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-b}}}$}

newcommand{codeimgcpp}{$vcenter{hbox{includegraphics[height=baselineskip]{example-image-c}}}$}



usepackage{calc}

usepackage[usenames,dvipsnames,svgnames,table]{xcolor}

usepackage{pdfpages,graphicx}

usepackage{mdframed}

usepackage{listings}

usepackage{filecontents}

definecolor{mybluei}{RGB}{0,173,239}

definecolor{myblueii}{RGB}{63,200,244}

definecolor{myblueiii}{RGB}{199,234,253}

definecolor{light-gray}{gray}{0.92}



definecolor{mainColor}{RGB}{211, 47, 47} % some dark red



renewcommandlstlistingname{Code}

lstset{

    language=Python,

    numbers=left,

    numbersep= 7mm,

    numberstyle=color{Black},

    stepnumber=1,

    tabsize=3,

    breakatwhitespace=false,

    breaklines=true,

    captionpos=b,

    basicstyle=color{Black}ttfamily,

    commentstyle=color{LimeGreen},

    keywordstyle=color{BurntOrange}bfseries,

    stringstyle=color{WildStrawberry},

    keywords={var, func, extends},

    frame=leftline,

    framesep=0mm,

    xleftmargin=3mm,

    framesep=2mm, 

    framerule=0mm,

    abovecaptionskip=5mm,

    aboveskip=baselineskip,

    belowskip=baselineskip

}



usepackage{tcolorbox}

newcounter{data}

newcounter{result}

newcounter{pythoncode}

newcounter{cppcode}

newcounter{matlab}

tcbuselibrary{skins,breakable,listings}



newtcbinputlisting[use counter=matlab,list inside=matlab,number within=chapter]{inputmatlab}[3]{listing options={style=Matlab-editor},%

        enhanced,noparskip,breakable,colback=light-gray,colframe=DarkSlateGray,opacitybacktitle=.8,%

        fonttitle=bfseries,before upper={hspace*{-1em}codeimg~#2},%

    title after break={centeringfootnotesizeitshapestrut Matlab Code~thematlab~--~continued},%

     listing only,listing options={xleftmargin=-1mm,#1,style=Matlab-editor},

     after upper={centeringstrut {bfseries Matlab Code~thematlab:}~#2},

     %frame hidden,   %<---------------------------------------

     arc=0pt,

     outer arc=0pt,

     boxrule=0pt,

     leftrule=1mm,  %<----------------------------

%     frame code={draw[gray,line width=2mm] ([xshift=-0.5pt]frame.north west) -- ([xshift=-0.5pt]frame.south west);},

     %

     listing file={#3},#1}



newtcbinputlisting[use counter=cppcode,list inside=cppcode,number within=chapter]{inputcppcode}[3]{listing options={language=C++},%

        enhanced,noparskip,breakable,colback=light-gray,colframe=DarkSlateGray,opacitybacktitle=.8,%

        fonttitle=bfseries,before upper={hspace*{-1em}codeimgcpp~#2},%

    title after break={centeringfootnotesizeitshapestrut C++ Code~thecppcode~--~continued},%

     listing only,listing options={xleftmargin=-1mm,#1,language=C++},

     after upper={centeringstrut {bfseries C++ Code~thecppcode:}~#2},

%     frame hidden, %<------------------------------

     arc=0pt,

     outer arc=0pt,

     boxrule=0pt,

     leftrule=1mm, %<---------------------------------

     %frame code={draw[gray,line width=2mm] ([xshift=-0.5pt]frame.north west) -- ([xshift=-0.5pt]frame.south west);},

     %

     listing file={#3},#1}



usepackage[numbered,framed]{matlab-prettifier}



begin{filecontents*}{sample.m}

% create a file for output

!touch testFile.txt

fid = fopen('testFile.text', 'w')

for i=1:10

  fprintf(fid,'%6.2f n', i);

end

end{filecontents*}



begin{filecontents*}{cppcodex.cpp}

#include <iostream>

using namespace std;



int main()

{

    int firstNumber, secondNumber, sumOfTwoNumbers;



    cout << "Enter two integers: ";

    cin >> firstNumber >> secondNumber;



    // sum of two numbers in stored in variable sumOfTwoNumbers

    sumOfTwoNumbers = firstNumber + secondNumber;



    // Prints sum

    cout << firstNumber << " + " <<  secondNumber << " = " << sumOfTwoNumbers;



    return 0;

}

end{filecontents*}



begin{document}



inputmatlab{Expansion Algorithm}{sample.m}



vspace*{7cm}



inputcppcode{Example C++ Code}{cppcodex.cpp}



end{document}