[Cuis-dev] dependency mechanism for TextModelMorph

[Mark Volkmann]

Your solution does cause the update: method to be called, but only on the
first keystroke in the TextModelMorph. The argument passed to update: is
the symbol #clearUserEdits. I want a solution that invokes update: on every
keystroke. I know I could listen for key events, but I'd really like to
find a solution that utilizes the dependency mechanism. Here is the latest
code in the initialize method:

initialize
    | tmm |

    tmm := TextModelMorph withText: '' :: acceptOnAny: true.
    tmm model addDependent: self.
    SystemWindow new
        addMorph: tmm;
        model: tmm model;
        openInWorld.

On Sun, Mar 23, 2025 at 10:24 PM Weslleymberg Lisboa <
weslleym.lisboa at gmail.com> wrote:

> 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
> >     --
> >     Cuis-dev mailing list
> >     Cuis-dev at lists.cuis.st <mailto:Cuis-dev at lists.cuis.st>
> >     https://lists.cuis.st/mailman/listinfo/cuis-dev <https://
> >     lists.cuis.st/mailman/listinfo/cuis-dev>
> >
> >
> >
> > --
> > R. Mark Volkmann
> > Object Computing, Inc.
>
> --
> Wéslleymberg Lisboa
> Graduado em Sistemas de Informação
> Docente no IFFluminense - Campus Itaboraí
>
>

-- 
R. Mark Volkmann
Object Computing, Inc.
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