[plt-scheme] Re: GUI

(string=? "hello" x) where x is the value from the text field


On Jan 7, 2010, at 2:14 PM, Avi wrote:

> Could you give me a hint? I was using text-contents a-text-field to
> use the products of a text field to work. What does text-contents
> produce?
>
> On Jan 7, 1:47 pm, Matthias Felleisen <matth... at ccs.neu.edu> wrote:
>> On Jan 7, 2010, at 1:42 PM, Avi wrote:
>>
>>> Is there a way to compare what is entered into a text-field using a
>>> conditional?
>>
>> Of course.
>>
>>> if x is equal to what is in text box a than run program b
>>
>> Yeap.
>>
>>
>>
>>
>>
>>> On Jan 6, 10:22 pm, Matthias Felleisen <matth... at ccs.neu.edu> wrote:
>>>> (require htdp/gui)
>>
>>>> (define w
>>>>   (create-window
>>>>    (list
>>>>     (list
>>>>      (make-button "go"
>>>>                   (lambda (e)
>>>>                     (begin
>>>>                       (hide-window w)
>>>>                       (local ((define w
>>>>                                 (create-window
>>>>                                  (list (list (make-button
>>>> "stop" (lambda (e) (hide-window w))))))))
>>>>                         true))))))))
>>
>>>> On Jan 6, 2010, at 6:18 PM, Avi wrote:
>>
>>>>> Please disregard my last few statements, I have decided to  
>>>>> change my
>>>>> code based on the revisions that matthias gave me, but I have run
>>>>> into
>>>>> a new problem, I want to have certain gui windows open other gui
>>>>> windows, but they all open at once, also I would like to know  
>>>>> how to
>>>>> make a function run when certain text is put into a text box.
>>>>> -Thanks
>>
>>>>> On Jan 6, 3:37 pm, Matthias Felleisen <matth... at ccs.neu.edu>  
>>>>> wrote:
>>>>>> After fixing numerous syntactic mistakes (in a nonsensical but
>>>>>> grammatically correct way), the two windows pop up just fine:
>>
>>>>>> ;; Intermediate plus Lambda
>>
>>>>>> (require htdp/gui)
>>
>>>>>> (define a-text-choices
>>>>>>      (make-message "Please pick what you want to do."))
>>>>>> (define options
>>>>>>   (list "Compound""Moles(experimental)"))
>>>>>> (define choices (make-choice options))
>>
>>>>>> (define b-text-field
>>>>>>      (make-text "Please input number of elements"))
>>
>>>>>> (define (choose-prog x)
>>>>>>   (cond
>>>>>>     [(symbol=? 2 (text-contents b-text-field)) "Molecule2"]
>>>>>>     [(symbol=? 3 (text-contents b-text-field)) "Molecule3"]
>>>>>>     [(symbol=? 4 (text-contents b-text-field)) "Molecule4"]))
>>
>>>>>> (define Element-Window
>>>>>>    (create-window
>>>>>>         (list (list b-text-field)
>>>>>>               (list (make-button "Go" ; choose-prog
>>>>>>                                  (lambda(e) (hide-window Element-
>>>>>> Window)))))))
>>
>>>>>> (define (choose x)
>>>>>>   (cond
>>>>>>     [(symbol=? 0 (choice-index choices))Element-Window]))
>>
>>>>>> (create-window (list (list a-text-choices)(list choices) (list
>>>>>> (make-
>>>>>> button "OK" choose))))
>>
>>>>>> ;; ---
>>
>>>>>> Since I don't know what you want to achieve, I can't help much
>>>>>> more. I
>>>>>> can tell you, though, that you should design individual functions
>>>>>> with
>>>>>> check-expect tests and examples and so on.
>>
>>>>>> Good luck -- Matthias
>>
>>>>>> On Jan 5, 2010, at 7:28 PM, Avi wrote:
>>
>>>>>>> I have a program which (perhaps I should add that I began  
>>>>>>> scheme 2
>>>>>>> months ago) gives me the following error:
>>
>>>>>>> reference to an identifier before its definition: choose-prog
>>>>>>> <----
>>>>>>> This is a definition
>>
>>>>>>> I know how to fix this error, but when I move my GUI file above
>>>>>>> this
>>>>>>> definition, it will give me another error that tells me  that I
>>>>>>> can
>>>>>>> not use a program before I define it. A runs B, but B takes data
>>>>>>> from
>>>>>>> A so B must come after A, but A also must go after B because of
>>>>>>> the
>>>>>>> manner in which the scheme compiler works. Please help me
>>>>>>> resolve. If
>>>>>>> I did not do a good enough job explaining, try it for yourself
>>>>>>> with
>>>>>>> this code (this is the code i'm having trouble with).
>>
>>>>>>> (define a-text-choices
>>>>>>>     (make-message "Please pick what you want to do."))
>>>>>>> (define options
>>>>>>>  (list "Compound""Moles(experimental)"))
>>>>>>> (define choices
>>>>>>>  (make-choice options)
>>>>>>> (define b-text-field
>>>>>>>     (make-text "Please input number of elements"))
>>
>>>>>>> (define choose-prog
>>>>>>>  (cond
>>>>>>>    [(symbol=? 2 (text-contents b-text-field)) Molecule2]
>>>>>>>    [(symbol=? 3 (text-contents b-text-field)) Molecule3]
>>>>>>>    [(symbol=? 4 (text-contents b-text-field)) Molecule4]))
>>
>>>>>>> (define Element-Window
>>>>>>>   (create-window
>>>>>>>        (list (list b-text-field)(list (make-button "Go" choose-
>>>>>>> prog
>>>>>>> (lambda(e)(hide-window Element-Window)))))))
>>
>>>>>>> (define choose
>>>>>>>  (cond
>>>>>>>    [(symbol=? 0 (choice-index choices))Element-Window]))
>>
>>>>>>> (create-window
>>>>>>>        (list(list a-text-choices)(list choices)(make-button "OK"
>>>>>>> choose)))
>>
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