From mboxrd@z Thu Jan  1 00:00:00 1970
From: zwz <zhangweize@gmail.com>
Subject: Re: [beamer] source code in two column
Date: Thu, 22 Sep 2011 19:15:08 +0800
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Eric S Fraga <e.fraga@ucl.ac.uk> writes:

> zwz <zhangweize@gmail.com> writes:
>
>> I use org to make presentations for C class.
>> Sometimes the code is quite long. And I want to arrange it in two
> column
>> so that it will be presented in one slide.
>>
>> I wonder how to do it easily using org-export. 
>> My current setting just hides the code that beyond the page in one
>> column.
>>
>> Best regards,
>> zwz 
>
> I cannot help you directly in that I don't know how to /flow/ text (or
> code) from one column to the next.  I don't think it is actually
> possible in beamer.
>
> However, it *is* straightforward to flow text from one slide to the next
> by simply adding =allowframebreaks= to the beamer environment
> arguments.  For instance,
>
> #+begin_src org
> *** Code example
>     :PROPERTIES:
>     :BEAMER_envargs: [allowframebreaks]
>     :END:
> #+LATEX: {\scriptsize
> #+begin_example
>    <code goes here>
> #+end_example
> #+LATEX: }
> #+end_src
>
> The slides will automatically be numbered using roman numerals should
> more than one slide (aka frame in beamer speak) be required.
>
> I use latex directives to make the font a little smaller to ensure that
> lines with within the slide width-wise.
>
> HTH,
> eric
It is a nice workaround.
But here in my org file, I have to put the "allowframebreaks" in level
two headlines (probably because of my setting #+BEAMER_FRAME_LEVEL: 2), 
otherwise it does not take effect.