[Cuis-dev] Changeset to make GUI code more robust

[Juan Vuletich]

Hi Hilaire,

Please read this message assuming I'm really trying to do my best both 
to help you, and to keep Cuis clean.

A good bug report, as described in 
https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev/blob/master/Documentation/GettingHelpWithCuis.md 
and elsewhere is an invaluable tool. Just including the walkback stack 
from the debugger you got would have saved me quite a bit of time.

In any case, I assume this "Edit style" window is part of DrGeo. And I 
guess you are using a DropDownButtonMorph (or a subclass) from the 
UI-Click-Select package. (If this is not the case, then you see why I 
need more information to be able to understand reported problems).

Assuming I'm right, now there are additional senders of #getListItem:. 
See that some of them are careful enough not to call with a zero 
argument, and others don't have this care. If I'm correct in all this 
guessing, the proper fix would be in DropDownButtonMorph >> 
#updateButton. I don't know how the fixed code would look like. I'm not 
really that familiar with these packages. What I'm almost sure is that 
changing #getListItem: in the base Cuis image to handle a zero argument 
is not the best solution.

Hope this helps,

On 2026-01-26 5:23 PM, Hilaire Fernandes via Cuis-dev wrote:
>
> This is what I tried to explained.
>
> It occurs with Smalltalk Script, for example
>
> (mySketch point: 0 at 0) color: (Color red adjustBrighness: 0.125)
>
> In the constructed sketch below, when the user decided to invoke the 
> style dialog for point, this color is not one of the defined ones in 
> the DrGeo drop down colors menu. In that circumstance, the index is 
> zero and the GUI crash. In the picture below, I can set the selected 
> color to none (the button is empty) because nil is returned instead of 
> an index access error. For DrGeo to take of this situation, I need the 
> GUI to return nil and not throw an error.
>
> Le 26/01/2026 à 19:54, Juan Vuletich a écrit :
>>
>> I can not see how #getListItem: could be called with a 0 argument. 
>> Perhaps it is the sender in DrGeo that can take care of that?
>>
>> Thanks,
>>
> -- 
> http://mamot.fr/@drgeo
>
-- 
Juan Vuletich
www.cuis.st
github.com/jvuletich
researchgate.net/profile/Juan-Vuletich
independent.academia.edu/JuanVuletich
patents.justia.com/inventor/juan-manuel-vuletich
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