beamer add tag
Anush (imported from SE)
Sometimes in beamer I like to use itemize as follows (code largely from https://topanswers.xyz/tex?q=1334):

    \documentclass{beamer}
    \setbeamersize{text margin left=10mm,text margin right=5mm} 
    \setbeamertemplate{frametitle}[default][center]
    \newenvironment{grayenv}{\only{\setbeamercolor{local structure}{fg=black!15}}}{}
    \begin{document}
    \begin{frame}{Frame Title}
    \setbeamertemplate{itemize items}[circle]
    \addtolength{\leftmargini}{-0.7cm}
    \begin{itemize}[<+-|gray@+(1)->]
    \setlength\itemsep{5pt plus 1fill}
    \item line one
    \item line two
    \item<+-> line three
    \end{itemize}
    \end{frame}
    \end{document}

This has the effect of fading out bullet point markers for old bullet points as well as a few other features I find helpful.  Notice that the final \item has to have <+-> so we don't get a new slide with all the markers gray.

Is there way to make a new environment `myitemize` that would capture all the features of my bespoke itemize environment?
Top Answer
samcarter
The problem with the last item is actually trivial to avoid if one thinks a bit outside the box (by just modifying three lines :) ). Instead of changing the colour of previous items, the trick is to change the colour of the current one:

```
\documentclass{beamer}
\setbeamersize{text margin left=10mm,text margin right=5mm} 
\setbeamertemplate{frametitle}[default][center]
\newenvironment{grayenv}{\only{\setbeamercolor{item}{fg=structure.fg}}}{}
\begin{document}
\begin{frame}{Frame Title}
\setbeamertemplate{itemize items}[circle]
\addtolength{\leftmargini}{-0.7cm}
\setbeamercolor{item}{fg=black!15}
\begin{itemize}[<+-|gray@+>]
\setlength\itemsep{5pt plus 1fill}
\item line one
\item line two
\item line three
\end{itemize}
\end{frame}
\end{document}
```

To make this into a custom environment:

```
\documentclass{beamer}
\setbeamersize{text margin left=10mm,text margin right=5mm} 
\setbeamertemplate{frametitle}[default][center]

\makeatletter
\newenvironment{grayenv}{\only{\setbeamercolor{item}{fg=beamer@blendedblue}}}{}
\makeatother

\newenvironment{myitem}[1][]{%
  \setbeamertemplate{itemize items}[circle]
  \addtolength{\leftmargini}{-0.7cm}
  \beamerdefaultoverlayspecification{<+-|gray@+>}
  \setbeamercolor{item}{fg=black!15}
  \begin{itemize}[#1]
  \setlength\itemsep{5pt plus 1fill}
}{
  \end{itemize}
}


\begin{document}
\begin{frame}{Frame Title}
\begin{myitem}
\item line one
\item line two
\item line three
\end{myitem}
\end{frame}
\end{document}
```

![document2.gif](/image?hash=84a38b5ec03358ee0826ccf52ea8225817ab01ab2ff5a3063d0196edb55c9ac8)

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