I see! Thank you for your help and your explanations!
2012/12/17 Jon Harper <jon.harpe...@gmail.com>
> The quotation you pass to the <border-button> constructor gets called by
> the system when the button is pressed. At this time, the stack has nothing
> to do with the stack shown in the listener. So you don't have the reference
> to the label.
>
> To have a reference to the label when the quotation is called, you should
> make a closure. This can be done with "curry" (or, in this case, the more
> appropriate "with"):
>
> "Test" <label> dup gadget.
> "Press" [ drop "Worked" >>text drop ] with <border-button> gadget.
>
> Other ways of creating closures are fried quotations (
> http://docs.factorcode.org/content/article-fry.html) or local variables (
> http://docs.factorcode.org/content/article-locals.html)
>
> Cheers,
> Jon
>
>
>
> On Mon, Dec 17, 2012 at 10:48 PM, Samuel Proulx <proulxsam...@gmail.com>wrote:
>
>> Hi,
>>
>> Yet another problem... Hopefully the last though.
>>
>> I tried to make a button that changes the text slot of a previously made
>> label. Here's what I did:
>>
>> "Test" <label> dup gadget.
>> "Press" [ drop "Worked" >>text ] <border-button> gadget.
>>
>> I got an error message saying "Data stack underflow" when I clicked it.
>> So I checked the quotation stack effect:
>>
>> [ drop "Worked" >>text ] infer.
>> ( x x -- x )
>>
>> It should take the button, drop it since I don't need it, take the label,
>> and then change its text to "Worked". It doesn't do it though. What did I
>> do wrong?
>>
>> Thanks in advance,
>> Samuel
>>
>>
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>
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