etoolbox instead of ifthen

Question

I try to realize this with etoolbox instead of ifthen.

What I have so far...

\documentclass{article}
\usepackage{tikzpagenodes}
\usetikzlibrary{calc}
\usepackage{etoolbox}
\usepackage[contents={},opacity=1,scale=1.485]{background}

\newtoggle{BgMat}
\settoggle{BgMat}{true}

\AddEverypageHook{%
  \iftoggle{BgMat}{%
    \ifboolexpe{\isodd{\thepage}}%
    {\backgroundsetup{angle=0,position={0.9\textwidth,-
    .7\textheight},%
    contents={\tikz[remember picture,overlay]{ %
    \coordinate (x) at (current page marginpar area.south east|-current page.south east);
    \draw[draw=none,fill=magenta!20]([xshift=-\textwidth]x)rectangle(current page.north west);}}}}%
    {\backgroundsetup{angle=0,position={0.9\textwidth,-
    .7\textheight},%
    contents={\tikz[remember picture,overlay]{ %
    \coordinate (x) at (current page marginpar area.south east|-current page.south east);
    \draw[draw=none,fill=orange!20](x)rectangle(current page.north east);}}}}%
    \BgMaterial
  }{%
  }
}

\usepackage{lipsum} % dummy text

\begin{document}
\lipsum[1-8]

\clearpage
\settoggle{BgMat}{false}% deactivate colored margins
\lipsum[1-8]

\clearpage
\settoggle{BgMat}{true}% activate colored margins
\lipsum[1-8]
\end{document}

@gigabytes: It does not compile, that seems the problem, but the O.P. forgot to mention it ;-) — , Dec 31 '17 at 10:33
From a quick view point I don't see any need for etoolbox here at all (Well, I used it also some years ago before I started to learn about \newif etc. — , Dec 31 '17 at 10:34
Especially, \thepage is not necessarily a literal number (think of roman figures!), so \isodd might fail — , Dec 31 '17 at 10:37
A side note: There is no \isodd macro in etoolbox. You meant \ifnumodd, must likely — , Dec 31 '17 at 10:55

score 4 · Accepted Answer · 2017-12-31T11:06:26.293

A solution without etoolbox features, just traditional \newif and \ifodd.

Please do not use \isodd{\thepage} etc. → \thepage can expand to 'anything', so \isodd as test for odd numbers might fail. If you want the literal numeric value of a counter named, say foo, use \value{foo}

And I learned from reading etoolbox, that there is no \isodd macro, the macro is called \ifnumodd.

\documentclass{article}
\usepackage{tikzpagenodes}
\usetikzlibrary{calc}

\usepackage[contents={},opacity=1,scale=1.485]{background}


\newif\ifBGMat

\BGMattrue

\AddEverypageHook{%
  \ifBGMat
  \ifodd\value{page} \backgroundsetup{angle=0,position={0.9\textwidth,-.7\textheight},
    contents={\tikz[remember picture,overlay]{ %
        \coordinate (x) at (current page marginpar area.south east|-current page.south east);
        \draw[draw=none,fill=magenta!20]([xshift=-\textwidth]x)rectangle(current page.north west);}}}
  \else
  \backgroundsetup{angle=0,position={0.9\textwidth,-.7\textheight},
    contents={\tikz[remember picture,overlay]{ %
        \coordinate (x) at (current page marginpar area.south east|-current page.south east);
        \draw[draw=none,fill=orange!20](x)rectangle(current page.north east);}}}
  \fi
  \fi
  \BgMaterial
 }



\usepackage{lipsum} % dummy text

\begin{document}
\lipsum[1-8]

\clearpage
\BGMatfalse
\lipsum[1-8]

\clearpage
\BGMattrue
\lipsum[1-8]
\end{document}

score 4 · Answer 2 · answered Dec 31 '17 at 11:02

I gladly recommend using etoolbox features rather than \ifthen. For instance, you can simplify your code using the fact that \ifnumodd is expandable.

Note \value{page} instead of \thepage.

\documentclass{article}
\usepackage{tikzpagenodes}
\usetikzlibrary{calc}
\usepackage{etoolbox}
\usepackage[contents={},opacity=1,scale=1.485]{background}

\usepackage{lipsum} % dummy text

\newtoggle{BgMat}
\settoggle{BgMat}{true}

\AddEverypageHook{%
  \iftoggle{BgMat}
   {% BgMat true
    \backgroundsetup{
      angle=0,
      position={0.9\textwidth,-0.7\textheight},
      contents={\ifnumodd{\value{page}}{\BgPictureOdd}{\BgPictureEven}},
    }%
    \BgMaterial
   }
   {% BgMat false
   }%
}

\newcommand{\BgPictureOdd}{%
  \tikz[remember picture,overlay]{%
    \coordinate (x) at (current page marginpar area.south east|-current page.south east);
    \draw[draw=none,fill=magenta!20]([xshift=-\textwidth]x)rectangle(current page.north west);}%
}
\newcommand{\BgPictureEven}{%
  \tikz[remember picture,overlay]{%
    \coordinate (x) at (current page marginpar area.south east|-current page.south east);
    \draw[draw=none,fill=orange!20](x)rectangle(current page.north east);}%
}


\begin{document}
\lipsum[1-8]

\clearpage
\settoggle{BgMat}{false}% deactivate colored margins
\lipsum[1-8]

\clearpage
\settoggle{BgMat}{true}% activate colored margins
\lipsum[1-8]
\end{document}

etoolbox instead of ifthen

2 Answers2