[Dev] Menu items support named dispatch

[Brendan O'Connor]

I didn't know about  eventsForNamedDispatch, I'll look into it -- it  
sounds more like what we need.

Brendan




On Tue, 02 Aug 2005 13:27:53 -0700, John Anderson <john at osafoundation.org>  
wrote:

> BroadcastEverywhere should be rarely used, and eventually we may  
> eliminate it. Typically you should use BroadcastInsideMyEventBoundary,  
> which broadcasts to all the blocks inside an event boundary, containing  
> the block that sent the event, or  
> BroadcastInsideActiveViewEventBoundary, which broadcasts to all the  
> blocks inside an event boundary containing the active view.  
> BroadcastEverywhere broadcasts to all the blocks that are rendered,  
> which is slow (especially during UpdateUIEvents) and doesn't allow  
> different parcels to have a different namespace for events.
>
> Let me know if none of the dispatch mechanisms, except  
> BroadcastEverywhere, are convenient for you and I'll try to come up with  
> an alternate dispatch mechanism.
>
> John
>
> Brendan O'Connor wrote:
>
>>> In our dynamic user interface, where blocks come and go, it's handy  
>>> to  have a mechanism that sends an event to whichever block is  
>>> available to  handle that event.  For this reason CPIA has had the  
>>> ability to dispatch  to events using the event's name.  This is  
>>> implemented as an attribute  "eventsForNamedDispatch" on Block.   
>>> Essentially, this allows the block  to publish events that it, or its  
>>> children blocks, can handle.  This  feature has not been widely used,  
>>> until now.
>>
>>
>> Donn, is this in general preferable to using BroadcastEverywhere?   
>> More  and more BroadcastEverywhere events are being sent around in the   
>> block-ified main calendar, but they do so because of the reason you're   
>> advocating eventsForNamedDispatch, namely that you can assign an  
>> arbitrary  number of listeners and the sender doesn't have to worry  
>> about who'  listening ... some notes on   
>> http://bugzilla.osafoundation.org/show_bug.cgi?id=3607
>>
>> Brendan
>> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
>>
>> Open Source Applications Foundation "Dev" mailing list
>> http://lists.osafoundation.org/mailman/listinfo/dev
>



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