[Cuis-dev] MVC et al

[Juan Vuletich]

Hi Hilaire,

On 8/4/2023 4:18 PM, Hilaire Fernandes via Cuis-dev wrote:
>
> Hi folks,
>
> Cuis does not come with the legacy MVC framework. From what I read 
> even the Smalltalk coming with MVC offers a revisited version, ok may 
> be not the Squeak one. Nevertheless it does not really matter if you 
> want to develop a GUI application with Cuis because all you need is to 
> use the observer pattern and view enriched with control, both present 
> in Cuis.
>
> Indeed, this pattern has seen since then alternate design. For DrGeo, 
> I pick up a different pattern, MVP, back in 2005. According to its 
> promoters, MVP fixes MVC flaws, you can read further about that on 
> related articles below.
>
> In a few word, with MVP, the model informs its views using the 
> observer pattern, so the model does not know about its view, as in 
> MVC. The views also handle the low level controls, then informs the 
> Presenter to take action at the model level. This part is different 
> than MVC and offer more flexibility.
>
> In DrGeo there are a lot of different Models: domain of the 
> application, the math items, the smalltlak sketch, the script, the 
> macro, etc. Most of them with dedicated Views of different nature to 
> display, design, etc the models. Then a bunch of Presenters, with 
> different level of complexity : domain application presenter, tools to 
> manage the user interaction on the canvas and builder to manage the 
> process of constructing a math item.
>
> All in all, I don't see any reason Cuis can not be used to design a 
> complex GUI application. I have reworked the DrGeo code and class 
> categories to make it easier to understand the different levels of 
> responsibility in the application. In repo but not released in app yet 
> though.
>
> Dolpin Smalltalk article about MVP, 
> <https://drive.google.com/file/d/1jWC7yLw8Q6sZeoq__m7K27vyOT8Dn55I/view?usp=sharing>
>
> Article from the original designers of MVP 
> <http://www.wildcrest.com/Potel/Portfolio/mvp.pdf>
>
> Wikipedia: 
> https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93presenter
>
> Hilaire
>

I haven't written a GUI end user application in Cuis in a while. I agree 
that Cuis has what is needed to build complex GUIs. DrGeo is the primary 
example.

I wasn't aware that DrGeo is based on MVP. I never used MVP although I 
read about it. Some day I'd find time to understand your design.

Thanks,

-- 
Juan Vuletich
cuis.st
github.com/jvuletich
researchgate.net/profile/Juan-Vuletich
independent.academia.edu/JuanVuletich
patents.justia.com/inventor/juan-manuel-vuletich
linkedin.com/in/juan-vuletich-75611b3
twitter.com/JuanVuletich

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