[Newbies] custom halos

stephane ducasse stephane.ducasse at free.fr
Fri Oct 10 06:51:03 UTC 2008

You are facing the nonOOP aspect of certain ugly parts of queak.
The fact that halosmorph cannot be defined per class is striking. Nice  
to have a kind of global var, this is were squeak lost OOP.
Once someone fixed that but it was never integrated (probably in 3.7  
or 3.8 days).
For my book I wanted special halos and I had to hack the global  
system. :(
Terribly sad.


On Oct 6, 2008, at 12:24 AM, Aidan Gauland wrote:

> K. K. Subramaniam wrote:
>> On Saturday 04 Oct 2008 10:55:28 am Aidan Gauland wrote:
>>> K. K. Subramaniam wrote:
>>>> For adding a new button called BBB, you need to
>>>>  1. add a halospec for addBBBHandle to Preferences class (see  
>>>> senders of
>>>> addScriptorHandle: for the list)
>>> How can I do (and undo) this programmatically?
>> I don't know of any simple way to do this. The specs are in a  
>> method, not in a global variable. So you will have to recompile the  
>> method to add new specs.
> I think I might have found out how: run  
> PreferencesClass>>installHaloSpecsFromArray: passing it an array in  
> the same format as the one that Preferences class>>customHaloSpecs  
> or PreferencesClass>>classicHaloSpecs retruns.
> This way, you can include halos in a package.  (I think, I don't  
> know about removing them later.)
> Thanks for the pointers (or references, in Smalltalk).
> -Aidan
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