World: r3wp

It's a good approach to want to design a first REBOL GUI program 
in MVC parts, but I think you'll find when you fit them together, 
that the resulting code would blend together. We don't really talk 
in MVC terms about View code

@Kaj, what is idiomatic REBOL to approach my problem? How do I make 
sense of it?

There's not much idiom for this, like in general in functional languages, 
because for such a small program, not much code is needed in REBOL

Just write the three MVC parts and then fit them together

@Kaj, ok. So I can just write all my VIEW as a function. Repeat the 
same for Model and CONTROLLER? How will I then combine them?

A view is typically a template. In REBOL, it would be a piece of 
View dialect

Model and controller would be functions, that you can then connect 
to the View GUI

@Kaj, thanks. This is begining to make sense. The view is like a 
template, something static the user will see. The MODEL, is a function, 
the controller coordinates with Model and View somehow.

@Kaj, I've not used MVC much myself, but the rumor out there is that 
it's one way to go. So when you say connect them, what do you mean?

@Kaj, Also, when I have a Model with multiple parts that are best 
represesnted as functions themselves, how can I make it available 
to the view(these "sub-functions")?

What you call idiom would mostly be the View dialect. That's specifically 
for specifying GUIs

The GUI dialect has places for actions. That's where your model and 
controller functions would go

For simple programs, that code is often so small that we tend to 
write it out directly in the GUI dialect

If you have little experience with all the forms of MVC, it's better 
to forget it and just follow the REBOL tutorials

@Kaj, can you point me to a sample program that has these features 
you speak of?

Kaj, I have looked at several REBOL tutorialss and I cannot seem 
to be able to make them do exactly what I wanted, hence my pining 
for a paradigm like MVC.

No, as I say, we don't usually use MVC as such. Any View example 
shows how to specify some GUI with some actions

@Kaj, oh I see. So an action like an Alert?

Perhaps, but an alert usually has its own little dialog GUI

Actions within the GUI dialect are regular REBOL code, so they can 
be anything

@Kaj, ok. do you have an example in mind?

Please follow the many tutorials linked from the REBOL site

@Kaj: Ok  thanks.

is there a way to add 5 to a variable anytime it is called?
for example x: 0    ....           counter: x + 5

so everytime I call counter it should result in 5, 10, ...

>> counter: does [x: x + 5]
>> x: 0
== 0
>> counter
== 5
>> counter
== 10

Or do I misunderstood?

@Geomol, thanks. That is perfect.

Anyway, pretty much everything is possible in REBOL, so just specify 
as precise as you can, what you want, and someone will come up with 
an idea how to do it.

@Geomol, good to know. thanks.

What does a misplaced item error mean? I get it when I try to read 
a file like so:

lines: read/lines %file.txt

Maybe there are some strange data in the file?

todun - a little bit more dynamic version of counter:


counter: func ['var add-value][if not value? var [set var 0] set 
var (get var) + add-value]


counter x 10   ; --- x does not have to exist, and if is inicialised 
and set to 0

@Pekr, thanks. Will see if that can fit into my implementation.

@Geomol, no. This worked before.

Can I post code here or something so you can see what I'm doing right 
or wrong?

A mistake is sometimes, that part of REBOL was changed, as everything 
can be redefined. If that's the case, you can try restart REBOL and 
see, if the error is still there.


And yes, you can post code, but most don't like it, if it's too long.

@Geomol, how many lines is too long?

:D
Post along!

@Geomol, restarting rebol didn't  me.

button-press?: layout [
    lines: read/lines %question-list.txt
    current-position: 1

;   len: length? lines                                           
                                                            

    show-one: btn "Show answer" [
        one-position: ++ current-position
        line: pick lines one-position
        result/text: line
	show result
    ]

    show-soon: btn "Soon" [

        soon-position: does [current-position: current-position + 5]
        line: pick lines soon-position
        result-soon/text: line
        show result-soon
    ]
    result: info " "
    result-soon: info " "
]

Uh, I think, you make the mistake, that the interiour of the LAYOUT 
block is actually a dialect. You put all kind of code in it.

The dialect is called VID in this case. Read:
http://www.rebol.com/docs/view-guide.html

It would be probably better if you would describe what you want to 
do, then someone might write the code right from the scratch :-)

We all went through those times, where we needed to realize, what 
dialects are, so don't give up.

A quick guess would be, that the code will work, if you put DO [ 
... ] around the code in the beginning of the block after LAYOUT.

DO in the VID dialect is described here:
http://www.rebol.com/docs/view-guide.html#section-44

@Geomol, @Pekr, thanks. I am trying to make flashcard display. However 
I want to do it myself so that I see all the places where I hiccuped.

what do I need to do to make it in the VID dialect?

Try change your block so it starts:

button-press?: layout [
    do [
        lines: read/lines %question-list.txt
        current-position: 1
;       len: length? lines
    ]
...

@Geomol, when I call the file in the CLI, I use do