[plt-scheme] Re: GUI

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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>>
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