[Golist] extending PlayableBase for simple action

[Moses Gunesch]

On Jul 27, 2008, at 2:36 PM, rboyd at telematter.com wrote:
> Cool, that worked.

Great, I will commit that change! I will check the sequence classes  
for similar issues.

Hey Jud or others who were writing callback classes, is this issue  
going to maybe simplify that sort of thing as well? I guess anything  
that happens instantly could now just happen in the start method  
without problems.

> But, why aren't we doing the listenTo() in PlayableGroup#addChild?

We only want to actively listen to events on playing items.  
Considering that everyone and their mom will be creating their own  
playables their own way, there's not fixed guarantee that they won't  
be dispatching events willy-nilly. To keep a tight reign on things,  
since the utility starts the item, that's the best time to start  
listening to its events.

> would shave a few extra cycles

Don't sweat it: Simultaneous groups are normally very small. The  
listenTo() method is not terribly complex, but it does have code that  
ensures that each child object is only ever listened to once so it can  
keep an accurate count. Over all my leaning is toward the most  
airtight system in this area, not performance.

I sort of treat utilities with a grain of salt since anyone can write  
their own – the group & sequence classes shipped with Go are just  
extras, provided for convenience.

- m
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