How to fade out old bullet markers? - TeX

topnush

:-D

samcarter replying to topnush

Don't wrap the math in `\begin{block} ... \end{block}` :D

topnush

if you do that

topnush

my students complain about a "block of math"

samcarter replying to topnush

That's why I prefer to just show all the items without all the animation stuff. IMHO this just distracts from the message of a slide.

topnush

I feel your new solution is much cooler :)

topnush

it's for students who need to be able to look at the stuff you told them before

samcarter replying to topnush

No, the problem is just that you don't like the gray out approach of beamer from the first part of my answer :) With this, all would be easy

topnush

it does make it feel like we are all using the wrong piece of software though

topnush

:)

samcarter replying to topnush

:D

topnush

it's all so clever and subtle

samcarter replying to topnush

In the last item `\item<+-> line four`, the `<+->` replaces the default one `<+-|gray@+(1)->`

topnush

now I see

topnush

oh sorryu

topnush

where is the overwriting?

topnush

do you mean this line \item<+-|gray@6-> line three ?

samcarter replying to topnush

I'm overwriting the default overlay specification of the itemisation by using `\item<+-> line four`

samcarter replying to topnush

Thanks :)

topnush

how did you rid of the final transition with the gray marker?

topnush

you have some serious skills :)

topnush

wow. I changed 6 to 7 and it is perfect

samcarter replying to topnush

```  
\documentclass{beamer}

\beamertemplatenavigationsymbolsempty
\setbeamersize{text margin left=10mm,text margin right=5mm} 
\setbeamertemplate{frametitle}[default][center]
\setbeamertemplate{itemize items}{}

\newenvironment{grayenv}{\only{\setbeamercolor{item}{fg=black!15}}}{}
\setbeamercolor{item}{fg=black} 

\begin{document}

\begin{frame}[t]{}
\addtolength{\leftmargini}{-0.7cm}
\setbeamertemplate{itemize items}[circle]
\begin{itemize}[<+-|gray@+(1)->]
\item line one
\item line two
\item<+-|gray@6-> line three
	\begin{enumerate}
  \setbeamercolor{item}{fg=black} 
	\item line three point one
	\item line three point two
	\item line three point three
	\end{enumerate}
\item<+-> line four
\end{itemize}
\end{frame}

\end{document}  
```

topnush

the problem is the bullet marker is faded out all the way through bullet three because of the enumerate

topnush

```  
\documentclass{beamer}

\beamertemplatenavigationsymbolsempty
\setbeamersize{text margin left=10mm,text margin right=5mm} 
\setbeamertemplate{frametitle}[default][center]
\setbeamertemplate{itemize items}{}

\newenvironment{grayenv}{\only{\setbeamercolor{item}{fg=black!15}}}{}
\setbeamercolor{item}{fg=black} 

\begin{document}



\begin{frame}[t]{}
\addtolength{\leftmargini}{-0.7cm}
\setbeamertemplate{itemize items}[circle]
%[<+(1)->]
\begin{itemize}[<+-|gray@+(1)->]
\item line one
\item line two
\item line three
	\begin{enumerate}
	\item line three point one
	\item line three point two
	\item line three point three
	\end{enumerate}
\item line four
\end{itemize}
\end{frame}

\end{document}

topnush

well not really a bug but an interesting case

topnush

aha.. found a bug :)

topnush

:) thanks

samcarter

```  
\newenvironment{topnushenv}{\only{\setbeamercolor{item}{fg=black!15}}}{}
\begin{itemize}[<+-|topnush@+(1)->]  
```  
would also work

samcarter replying to topnush

No, you can use a random name. I'm explicitly setting the gray colour inside the environment with `black!15`

samcarter replying to topnush

You can read it as "make some action at some overlay"

topnush

but how does gray refer to grayenv? Is there some beamer thing that says that colorenv relates to color?

topnush

ah ok

samcarter replying to topnush

That's beamer syntax, you could also do `alert@2` and similar

topnush

so gray@ means use grayenv?

samcarter replying to topnush

no, it is just a syntax to use the `grayenv` I defined

topnush

I don't understand when @ is used

topnush

that's great. and gray@ is just latex for "apply gray"?

samcarter replying to topnush

`+-` means that items are uncovered one by one and then stay until the end and `gray@+(1)-` that the bullet colour gets changed one overlay after they are uncovered and stay until the end

topnush

I mean `<+-|gray@+(1)->`

samcarter replying to topnush

you're welcome!

topnush

could you break down +-|gray@+(1)-> for me please

topnush

it all works now! Thank you so much

topnush

argh

samcarter

```  
\documentclass{beamer}

\beamertemplatenavigationsymbolsempty
\setbeamersize{text margin left=10mm,text margin right=5mm} 
\setbeamertemplate{frametitle}[default][center]
\setbeamertemplate{itemize items}{}

\newenvironment{grayenv}{\only{\setbeamercolor{item}{fg=black!15}}}{}
\setbeamercolor{item}{fg=black} 

\begin{document}

\begin{frame}
\setbeamertemplate{itemize items}[circle]
\begin{itemize}[<+-|gray@+(1)->]
\item line one
\item line two
\item line three
\item<+-> line four
\end{itemize}
\end{frame}

\end{document}
```

topnush

but I can't get the syntax right

topnush

I feel it should be added to \setbeamertemplate{itemize items}[circle]

topnush

the last thing is to make it black instead of blue. Adding \setbeamercolor{item}{fg=black} doesn't work

topnush

nice trick!

samcarter replying to topnush

You can filter the overlays `\begin{frame}<1-4>` or add the overlay specifications manually like in my previous version of the answer

1 Answer