BEAMER_act property documented in ox-beamer.el

BEAMER_act property documented in ox-beamer.el

[Sebastien Vauban]

Hello,

I'm trying to understand the sentence from ox-beamer.el:

    Headlines also support the "BEAMER_act" property.  [It] is translated as an
    overlay/action specification (or a default overlay specification when
    enclosed within square brackets).

Rewritten, it says that that property is translated as:

- a default overlay specification *when enclosed within square brackets*, or
- an overlay/action specification *when NOT enclosed within square brackets*.

Though, I don't understand exactly what that *default* specification really
means. Moreover, I can't get it: without square brackets, PDFLaTeX becomes
crazy...

--8<---------------cut here---------------start------------->8---
* Overlay/action specification enclosed within square brackets

The following 2 cases are exported in exactly the same LaTeX code.

** With angular brackets
   :PROPERTIES:
   :BEAMER_act: [<+->]
   :END:

- Item 1
- Item 2

** Without angular brackets
   :PROPERTIES:
   :BEAMER_act: [+-]
   :END:

- Item 1
- Item 2

* Overlay/action specification NOT enclosed within square brackets   :noexport:

The follow 2 cases make PDFLaTeX infloop...

** Without angular brackets
   :PROPERTIES:
   :BEAMER_act: <+->
   :END:

- Item 1
- Item 2

** Without angular brackets
   :PROPERTIES:
   :BEAMER_act: +-
   :END:

- Item 1
- Item 2
--8<---------------cut here---------------end--------------->8---

Anyone undestanding more than I am?

Best regards,
  Seb

-- 
Sebastien Vauban

Re: BEAMER_act property documented in ox-beamer.el

[Eric S Fraga]

On Tuesday, 17 Jun 2014 at 22:01, Sebastien Vauban wrote:
> Hello,
>
> I'm trying to understand the sentence from ox-beamer.el:
>
>     Headlines also support the "BEAMER_act" property.  [It] is translated as an
>     overlay/action specification (or a default overlay specification when
>     enclosed within square brackets).
>
> Rewritten, it says that that property is translated as:
>
> - a default overlay specification *when enclosed within square brackets*, or
> - an overlay/action specification *when NOT enclosed within square brackets*.
>
> Though, I don't understand exactly what that *default* specification really
> means. Moreover, I can't get it: without square brackets, PDFLaTeX becomes
> crazy...

I agree with you: I am not entirely sure what a *default* specification
means.  However, without square brackets, I get output that makes sense
and pdflatex has no problems with it.

I am using beamer from debian package latex-beamer 3.24-1 with texlive
2013.20130722.
-- 
: Eric S Fraga (0xFFFCF67D), Emacs 24.4.50.2, Org release_8.2.7-1110-g25fc4d

Re: BEAMER_act property documented in ox-beamer.el

[Nicolas Goaziou]

Hello,

Eric S Fraga <e.fraga@ucl.ac.uk> writes:

> On Tuesday, 17 Jun 2014 at 22:01, Sebastien Vauban wrote:
>
>> I'm trying to understand the sentence from ox-beamer.el:
>>
>>     Headlines also support the "BEAMER_act" property.  [It] is translated as an
>>     overlay/action specification (or a default overlay specification when
>>     enclosed within square brackets).
>>
>> Rewritten, it says that that property is translated as:
>>
>> - a default overlay specification *when enclosed within square brackets*, or
>> - an overlay/action specification *when NOT enclosed within square brackets*.
>>
>> Though, I don't understand exactly what that *default* specification really
>> means. Moreover, I can't get it: without square brackets, PDFLaTeX becomes
>> crazy...
>
> I agree with you: I am not entirely sure what a *default* specification
> means.

See Beamer class user guide about "\begin{frame}" syntax (II.8, p. 59 on
version 3.20). Basically, default specification also applies to all
commands and environments within the frame, as long as they do not
provide their own specification.


Regards,

-- 
Nicolas Goaziou