[Cuis-dev] dependency mechanism for TextModelMorph
Mark Volkmann
r.mark.volkmann at gmail.com
Mon Mar 24 05:56:05 PDT 2025
Using a suggestion from Hilaire, this works. It passes the String value to
update: on every keystroke. But it seems there should be a solution that
does not require listening for key events.
initialize
| scroller tmm |
tmm := TextModelMorph withText: '' ::
acceptOnAny: true;
askBeforeDiscardingEdits: false.
scroller := tmm scroller.
scroller addDependent: self.
scroller setProperty: #keyStroke: toValue: [:event |
scroller changed: scroller model actualContents string
].
SystemWindow new addMorph: tmm; openInWorld.
On Mon, Mar 24, 2025 at 7:41 AM Mark Volkmann <r.mark.volkmann at gmail.com>
wrote:
> 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.
>
--
R. Mark Volkmann
Object Computing, Inc.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.cuis.st/mailman/archives/cuis-dev/attachments/20250324/d8a7c8db/attachment.htm>
More information about the Cuis-dev
mailing list