World: r3wp

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

DO

Sure, but that's another DO. :)
Think dialects. I know, it's hard at first.

@Geomol, what about dialects ?

What does the english word "book" mean?


Is it "a book" you can read in, or is it "book a ticket". You see, 
the same word can mean more than one thing. Same in REBOL.

also you say I put "other stuff" and such. I'm guessing this means 
I'm mixing code in a non-kosher way. From a paradigm-like sort of 
way, how to I separate out my code in REBOL way or the correct way?

@Geomol, ok. In this context, what does dialect mean?

in the context of my problem, my getting this error?

In your example, you use the LAYOUT dialect, and you have to follow 
the rules of that dialect.


A dialect is a sequence of datatypes, that hold a certain meaning, 
because they're used in a certain context.

But try put the DO [..] block in, as I suggested, and tell us, if 
it works then.

@Geomol, when I run the script with the DO include, I get the following:

>> do %circular_series.r
** Script Error: btn has no value
** Where: forever
** Near: show-one: btn "Show answer" [
    one-position: ++ current-position 
    line: pick lines one-position 
    result/text:...

Eh, did you put the new DO block around all the content inside your 
LAYOUT block? I just suggested, you should put it around the first 
3 lines.

@Geomol, that dialect description is helpful. What context can I 
use a dialect, the VID in this case, and how do I know what data-types 
to use and what external things to the dialect to use(or not to use)?

To know, how to use the LAYOUT dialect, read the doc:
http://www.rebol.com/docs/view-guide.html

That's what we do.

@Geomol, oh ok. let me change that now.

@Geomol, I've looked at that doc. It doesn't specifically tell you 
anywhere what to do with the dialect when you want to introduce foriegn 
coding to the dialect.

Yes, it does. At:
http://www.rebol.com/docs/view-guide.html#section-44

I stand corrected. Maybe that didn't make sense to me at the time, 
or I skipped that part of the doc.

@Geomol, so why don't I put the DO[...] around code inside the btn 
blocks that are not like VID commands?

I mean to ask, why does it work?

my ultimate goal is to deal with circular lists. Using this doc, 
I can make one:http://www.rebol.net/cookbook/recipes/0017.html

but I want to be able to always go round around the list, go round 
around the file and also write to file the current location I am 
at.

Because those blocks are action facets described here:
http://www.rebol.com/docs/view-guide.html#section-17


When you interact with a style, in this case a button, those blocks 
are evaluated as if they were normal REBOL code, so the rules of 
the layout dialect doesn't rule there.

@Geomol, thanks for clearing that up

Doing a file access and then storing the state of your access, writing 
that to file, seems quite difficult to formulate in REBOL, for me 
anyways.

What I mean is that, if I read the file and end my read at a particular 
location before closing the GUI, does REBOL allow you to presist 
your state across executions of the program?

Things like INDEX? will tell you, where you are in a series. And 
you can easily save rebol code/values to disc using the SAVE function, 
and load them again with the LOAD function.

@Geomol, INDEX? will tell me its position, but the circular series 
link I sent you talks about how to always go around and around the 
series. I want to do the same with the lines of a file, but I'm not 
sure how to do it without using REPEAT

I don't want to use REPEAT because I only want to do it while I press 
the button

Pass! I'm not enough into your problem to point you into a direction. 
But go on and read some more of the docs, and you should be able 
to help yourself some more:

http://www.rebol.com/docs/core23/rebolcore.html
http://www.rebol.com/docs/dictionary.html

@Geomel, thanks. Also, is it allowed for me to use REBOL/Core when 
doing stuff in REBOL/View?

graphics related stuff is not possible in REBOL/Core.

R/View incorportes R/Core

@Henrik, @GrahamC, thanks.

Is there anyway to clear an info view after a button is pressed?

For example, if I press question button(displays the question in 
an info view), and then I press answer button(which displays the 
corresponding answer), when next I press question, I want the answer 
info view to go back to being blank. How can I do this? thanks.

The code in the next post demonstates most of the mechanics of what 
you are asking for:

question-database: [
    ["Doctor who?"  "Oops -- silence has fallen"]

    ["Is there a doctor in the house?" "Yes -- his name is Gregory"]
]



next-question: func [ ;; function to find and display the next question
   ][
   question-database: next question-database

   if tail? question-database [question-database: head question-database]
   question-field/text: first first question-database
     answer-field/text: ""
     show question-field
     show answer-field
    ]


   ;; code to define and run the panel
unview/all
view/new layout [
  across
  question-field: field ""
  answer-field: field ""
  return
  answer-button: button "show answer" [
               answer-field/text: second first question-database
               show answer-field
               ]
  next-button: button "Next question" [
                 next-question
                  ]
     ]

  ;; open code to start it running
next-question     
do-events

@Sunanda, thanks. Let me play with it to see where the info view 
reseting takes place.

try SET-FACE and CLEAR-FACE instead of setting and clearing face/text 
directly.

if you use:

source set-face

you can see what it does

@Henrik, thanks. will do.