From mboxrd@z Thu Jan  1 00:00:00 1970
From: Carsten Dominik <carsten.dominik@gmail.com>
Subject: Re: The \only<> overlay in beamer
Date: Wed, 29 Sep 2010 18:12:00 +0200
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To: Rafael Calsaverini <rafael.calsaverini@gmail.com>
Cc: emacs-orgmode@gnu.org


On Sep 18, 2010, at 8:15 PM, Rafael Calsaverini wrote:

> Hi there.
>
> I'm trying to use the \only<> command to produce a beamer  
> presentation but it seems that org-beamer filters out this. I've  
> tried it in many different ways, and didn't get the desired effect.
>
> Particularly, I've tried the obviously wrong thing:
> #+STARTUP:      beamer
> #+LaTeX_CLASS: beamer
> #+LaTeX_CLASS_OPTIONS: [smaller, presentation]
>
> * Foo
> ** Slide 1
> \only<1> {
> ***  Block1     :B_block:
>      :PROPERTIES:
>      :BEAMER_env: block
>      :END:
>      - bla11
>      - bla12
>      - bla13
> }
> \only<2>{
> ***  Block2     :B_block:
>      :PROPERTIES:
>      :BEAMER_env: block
>      :END:
>      - bla21
>      - bla22
>      - bla23
> }
>
> Which obviously break-up. And I also tried what I believe would be a  
> nice syntax for this:
>
> * Foo
> ** Slide 1
> ***  Block1    :B_block:
>      :PROPERTIES:
>      :BEAMER_envargs: \only<1>
>      :BEAMER_env: block
>      :END:
>      - bla11
>      - bla12
>      - bla13
>
> ***  Block2     :B_block:
>      :PROPERTIES:
>      :BEAMER_envargs: \only<2>
>      :BEAMER_env: block
>      :END:
>      - bla21
>      - bla22
>      - bla23
>
> Apparently the parser just removes the "\only" and interprets this  
> as <1> and <2>. The resulting latex is exactly the same as if the  
> "\only" wasn't there.
>
> Is there a way to use the "\only<>" overlay in a clean way?

What does \only do?

- Carsten