[Cuis-dev] dependency mechanism for TextModelMorph

[Weslleymberg Lisboa]

This works:

initialize

	| tmm window |
	
	tmm := TextModelMorph withText: '' :: acceptOnAny: true.
	
	"tmm model when: #changed: send: #update: to: self. (Samething as below)"
	tmm model addDependent: self.
	
	SystemWindow new addMorph: tmm; model: tmm model; openInWorld.


update: anEvent
	
	(anEvent asString, ' triggered!') print.

Have no idea at the moment why this works and your example doesn't. But 
I looked on how TextEditor class>>#open and SystemWindow 
class>>#editString:label:wrap: does it to see what needs to be set 
before opening the window.


Em 23/03/2025 18:31, Mark Volkmann escreveu:
> I must be doing a poor job of describing what I want to achieve.
> I've boiled it down to the minimum code needed to demonstrate.
> Here are the steps:
> 
> - create a subclass of Object
> 
> - add the following instance methods
> 
> initialize
>      | tmm |
> 
>      tmm := TextModelMorph withText: '' :: acceptOnAny: true.
>      SystemWindow new addMorph: tmm; openInWorld.
> 
> update: arg
>      'update was called' print
> 
> What can I do in the initialize method so update: is called after every 
> keystroke in the TextModelMorph?
> Here are two things I tried that do not work:
> 
>      tmm model addDependent: self.
> 
>      tmm model when: #actualContents send: #update: to: self.
> 
> On Sun, Mar 23, 2025 at 11:45 AM Weslleymberg Lisboa via Cuis-dev <cuis- 
> dev at lists.cuis.st <mailto:cuis-dev at lists.cuis.st>> wrote:
> 
>     TextModel generates some events. Browse senders of #changed: to see
>     it. Maybe the event that #addDepedent: listens to is not the one you
>     need.
> 
>     Cuis use the Observer Pattern as a dependency mechanism (see [1]) so
>     #addDependent: and #changed: are "simplifications" of #when:send:to:
>     and #triggerEvent:with:
> 
>     IMHO if what you need is to be notified of changes in the model, I'd
>     use it directly instead of making TextModelMorph notify me.
> 
>     1 - <https://github.com/nmingotti/The-Cuis-CookBook/wiki/The-
>     Dependency-Mechanism--3 <https://github.com/nmingotti/The-Cuis-
>     CookBook/wiki/The-Dependency-Mechanism--3>>
> 
> 
>     Em 23 de março de 2025 11:53:10 BRT, Mark Volkmann via Cuis-dev
>     <cuis-dev at lists.cuis.st <mailto:cuis-dev at lists.cuis.st>> escreveu:
> 
>         As far as I can tell,TextModelmorph does not send#changed:every
>         time its value changes, so that prevents me from listening for
>         updates. I see that the TextModelmethodactualContents:does
>         send#changed:, but that is not invoked on every change to
>         aTextModelMorpheven when it is configured withacceptOnAny: true.
> 
>         On Sun, Mar 23, 2025 at 9:38 AM <ken.dickey at whidbey.com
>         <mailto:ken.dickey at whidbey.com>> wrote:
> 
>             On 2025-03-23 06:35, Mark Volkmann via Cuis-dev wrote:
> 
>              > ...
>              > myTextModelMorph addDependent: self.
>             ..
>              >
>              > I have a few questions.
>              > - Are there reasons why I should not want this ability?
> 
>             Generally, Morphs are Views and update to reflect changes in an
>             underlying Model.
> 
>             A Morph can be a Model if sensible.
> 
>              > - Would it be better to listen for changes on the
>             underlying TextModel?
> 
>             IMHO, yes.
> 
>             $0.02,
>             -KenD
> 
> 
> 
> 
>     --
>     Att.
>     Wéslleymberg Lisboa
>     Graduado em Sistemas de Informação
>     Docente no IFFluminense - Campus Itaboraí
>     Ex-Bolsista de IC do Núcleo de Computação Científica (NC2-IFF) -
>     Projeto IFF Aerospace
>     Github: https://github.com/weslleymberg <https://github.com/
>     weslleymberg>
>     Tel.: +55 22 99931-2376
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> 
> 
> 
> -- 
> R. Mark Volkmann
> Object Computing, Inc.

-- 
Wéslleymberg Lisboa
Graduado em Sistemas de Informação
Docente no IFFluminense - Campus Itaboraí