Enumerate with options in items

Question

I want an enumerated list where each number must be white circled on a coloured background. The background color must be passed as an option to each item in the list, without excluding color repetitions. The code has to be something like this:

\documentclass[12pt,a4paper]{book}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[italian]{babel}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{makeidx}
\usepackage{graphicx}
\usepackage{enumerate}
\begin{document}
    \begin{enumerate}
        \item[color1] Text
        \item[color1] Text
        \item[color2] Text
    \end{enumerate}
\end{document}

Unrelated : amsfonts is autoloaded by amssymb. – daleif Mar 31 '21 at 17:21 — daleif, Mar 31 '21 at 17:21

Steven B. Segletes · Accepted Answer · 2021-03-31T17:49:28.927

Borrowing heavily from my answer here, Enumerate with circles and different colors. The default color, if not specified, is black.

See ADDENDUM to provide two-digit capacity, per OP request.

\documentclass{article}
\usepackage{stackengine,xcolor}
\newcommand\circnum[2]{\stackinset{c}{}{c}{.1ex}{\small\textcolor{white}{#2}}%
  {\abovebaseline[-.7ex]{\Huge\textcolor{#1}{$\bullet$}}}}
\newenvironment{myenum}
{\let\svitem\item
 \renewcommand\item[1][black]{%
   \refstepcounter{enumi}\svitem[\circnum{##1}{\theenumi}]}%
\begin{enumerate}}{\end{enumerate}}
\begin{document}
\begin{myenum}
\item[red] first
\item[blue] next
\item[cyan] third
\item fourth
\item last
\end{myenum}
\end{document}

ADDENDUM

\documentclass{article}
\usepackage{stackengine,xcolor,graphicx}
\newcommand\circnum[2]{\smash{\stackinset{c}{}{c}{.2ex}{\small\textcolor{white}{#2}}%
  {\abovebaseline[-1.43ex]{\Huge\textcolor{#1}{\scalebox{1.5}{$\bullet$}}}}}}
\newenvironment{myenum}
{\let\svitem\item
 \renewcommand\item[1][black]{%
   \refstepcounter{enumi}\svitem[\circnum{##1}{\theenumi}]}%
\begin{enumerate}}{\end{enumerate}}
\begin{document}
\begin{myenum}
\item[red] first
\item[blue] next
\item[cyan] third
\item fourth
\item ...
\item ...
\item ...
\item ...
\item ...
\item ...
\item[purple] last
\end{myenum}
\end{document}

Thank you for the quick answer. If you can do a further update: make larger circles that also fit numbers with multiple digits. — Raffaele Santoro, Mar 31 '21 at 17:38
@RaffaeleSantoro Please see edited SUPPLEMENT to my answer for your request. — Steven B. Segletes, Mar 31 '21 at 17:49

score 2 · Answer 2 · answered Mar 31 '21 at 17:37

The following also builds on Enumerate with circles and different colors, updating the first level of enumerate to use a new \item, where the optional argument specifies the colour. If you don't supply an optional argument, the default configuration is used. This allows you to use the same enumerate environment for a coloured-\item list or not.

\documentclass{article}
\usepackage{stackengine,xcolor,enumitem}
% https://tex.stackexchange.com/a/590844/5764
\newcommand\circnum[1]{\stackinset{c}{}{c}{.1ex}{\small\textcolor{white}{#1}}%
  {\abovebaseline[-.7ex]{\Huge\textcolor{enumicol}{\textbullet}}}}
\newcommand{\updateitem}{%
  \let\olditem\item% Store \item in \olditem
  \renewcommand{\item}[1][]{%
    % https://tex.stackexchange.com/a/53091/5764
    \if\relax\detokenize{##1}\relax
      % No optional argument supplied to \item
      \renewcommand{\labelenumi}{\theenumi.}% Default
    \else
      \colorlet{enumicol}{##1}% Update current circle label colour
      \renewcommand{\labelenumi}{\circnum{\theenumi}}% Set label as a circled number
    \fi
    \olditem% Call original \item
  }
}
\setlist[enumerate,1]{before=\updateitem}
\begin{document}
\begin{enumerate}
  \item[red] first
  \item[green] next
  \item[blue] third
  \item[black!50] fourth
  \item last
\end{enumerate}
\end{document}

Enumerate with options in items

2 Answers2