On 3 July 2013 02:46, Chris Muller <asqueaker at gmail.com> wrote:
>> The last remaining dependency is:
>>
>> LanguageEnvironment class >> startUp
>>     self clearDefault.
>>     Clipboard startUp.
>>     HandMorph startUp.
>>
>> I am stumped as to how to preserve this behaviour and sever the
>> dependency. Smalltalk at: #HandMorph is _not_ a solution. It makes
>> things worse because you hide the dependency, but it's still there,
>> ready to bite you at a random moment.
>
> Not sure why it "hides it" since references to HandMorph would still
> find it.

You couldn't use "class references" (alt-shift-n) to find the
dependencies and the Dependency Browser wouldn't be able to find it.

>  Would it still bite even with a guard?
>
>   (Smalltalk classNamed: #HandMorph) ifNotNil: [ : cls | cls startUp ]
>
> I suppose if someone loaded Multilingual _first_ one could get bitten
> by not starting the Clipboard?  Not sure about that..

Yes. But also it's the wrong thing; the dependency is inverted. In
order to support some new shiny feature that needs state reset when
the LanguageEnvironment changes, I'd need to affect the base
infrastructure. I guess what I'm looking for is a callback or
announcement mechanism. "Hey guys, the LanguageEnvironment has
changed", and then Clipboard and HandMorph can say "oh right, I must
<insert state change>".

>> Inlining the above into Language class >> #startUp's call sites
>> seems... undesirable.
>>
>> Perhaps a startup registry, and HandMorph's and Clipboard's
>> #initialize would say something like LanguageEnvironment
>> registerForStartup: self ?
>
> What about Smalltalk addToStartupList:after:?

It's not an image startUp thing, but rather LanguageEnvironment class
>> #startUp is called when the Locale changes, and a few other places.

frank