Odd and even itemize symbols

Question

I want to make a dialogue between two people with the "commenting icon" in front of every sentence. I somewhat got what I want by using enumitem and fontawesome packages.

Here is my code so far.

\documentclass{article}
\usepackage{enumitem}
\usepackage{fontawesome}
\usepackage{xcolor}
\begin{document}
    \begin{itemize}
        \item[\color{blue!70!white}\faCommenting] First person
        \item[\color{green!70!black}\faCommentingO] Second person
        \item[\color{blue!70!white}\faCommenting] First person
    \end{itemize}
\end{document}

Now I'd like to define it as a new environment to use this multiple times. I know there is a \labelitemi command but it makes change for all items, for this I am not sure how to do it.

I did look up for old questions and found this but couldn't understand the steps to have them fit my case.

score 8 · Answer 1 · answered Sep 11 '20 at 10:53

You can make a command that changes its own definition, and use that as the label, for example like this:

\documentclass{article}
\usepackage{enumitem}
\usepackage{fontawesome}
\usepackage{xcolor}
\makeatletter
  \def\speech@bubble@a{%
    \color{blue!70!white}\faCommenting
    \global\let\speech@bubble\speech@bubble@b
  }
  \def\speech@bubble@b{%
    \color{green!70!black}\faCommentingO
    \global\let\speech@bubble\speech@bubble@a
  }
  \newlist{dialog}{itemize}{1}
  \newlist{dialog}{itemize}{1}
  \setlist[dialog]{
    before={\global\let\speech@bubble\speech@bubble@a},
    label={\speech@bubble},
  }
  \setlist[dialog]{
    before={\global\let\speech@bubble\speech@bubble@b},
    label={\speech@bubble},
  }
\makeatother
\begin{document}
First person first:
\begin{dialog}
  \item bla
  \item bla
  \item bla
  \item bla
  \item bla
\end{dialog}
Second person first:
\begin{dialog}
  \item bla
  \item bla
  \item bla
  \item bla
  \item bla
\end{dialog}
\end{document}

score 7 · Accepted Answer · answered Sep 11 '20 at 12:03

Here is a solution with the \newtoggle command from etoolbox. To simplify the use of this solution, I defined a new itemize-like environment, alternitem:

\documentclass{article}
\usepackage{enumitem}
\usepackage{fontawesome}
\usepackage{xcolor}
\usepackage{etoolbox}
%
\newtoggle{greeny}
\newlist{alternitem}{itemize}{1}
\setlist[alternitem]{label={\iftoggle{greeny}%
{\color{green!70!black}\faCommentingO\global\togglefalse{greeny}}%
{\color{blue!70!white}\faCommenting\global\toggletrue{greeny}}%
}}
\begin{document}
\begin{alternitem}
 \item First person
 \item Second person
 \item First person
 \item First person
 \item Second person
 \item First person
 \end{alternitem}
\end{document}

Very nice this \newtoggle :-) – Sebastiano Sep 11 '20 at 12:14 — Sebastiano, Sep 11 '20 at 12:14

Odd and even itemize symbols

2 Answers2