[TYPO3-ect] lib/div multiple extension with same key on one page - action dispatcher

[Franz Koch]

Hi Elmar,

> I think there are solutions. 
> 
> Using the ext_key as designator is only the fallback solution, if you do
> nothing else!!!
> 
> I.e. you can set "var $defaultDesignator" to any value you like or provide a
> key in the moment of link generation.
> 
> It's that flexible, because the requirements are very different for
> different extensions. Sometimes different plugins work synchronized. They
> need to share the same designator. Sometimes the same extension needs
> different designators within the same page, like in your case.
> 
> The designator should be "unique enough" (TM), so best start with the
> extension key and end with a string of your choice. 
> 
> Often the controllers class name is a good designator (like in
> tslib_pibase): tx_myext_aController

well, I guess this solution is not a propper solution for the problem. 
What if you have two instances of the same plugin that have to listen to 
the same piVars, but one should allow for actionA (e.g. category view) 
and actionB (e.g. listing of category items) and the second should 
always show actionC (detailView).

This problem also existed in cal and it's solved like this:
There is a configuration option (TS which can be overridden with FF) 
where you can define allowed actions for a controller. If the action 
request is within the list of allowed actions, it's executed (if it 
exists) - if not, it falls back to the first allowed action/view.

I think this is also needed for lib/div as a basic feature if it's not 
already there somewhere (didn't follow the last changes).

--
Kind regards,
Franz Koch