Mark Talluto wrote:
On May 15, 2007, at 3:55 PM, Chipp Walters wrote:
I'm using the latest release of Rev 2.8.1
I create a new stack, add a single fld and a single button. In the
button script I add:
on mouseUp
put the long ID of fld 1 into tID
set the disabled of tID to not the disabled of tID
put "fred" into tID
end mouseUp
When I press it, the field becomes disabled alternately (as
expected). The disabled is only here to show that tID is
referenced correctly.
But, "fred" never gets put in the field? I wonder why? Is this a bug?
BTW, this does work:
set the text of tID to "fred"
I think it is a bug.
If Rev variables were types and tID was typed as an object reference it
might be a bug.
But as it is, Rev vars are just buckets into which you can put anything
you want. One minute you can store a string that refers to an object,
the next minute you can store some arbitrary text -- how is Rev to know
you mean otherwise?
Rev vars don't have properties, but objects do, so when you say:
set the text of tID to "fred"
...it knows that you're setting a property so it first evaluates tID to
get the object reference, then sets that object's property.
The ambiguity is -- once again -- HyperCard compatibility. In most
languages, properties are set in a consistent way, and in Rev the text
property can be set using "set the text of...".
But HyperCard allowed the convenience of setting the text property
without having to name the property by using "put <val> into <obj>".
While it's convenient to treat the text property of objects as an
implied container, the ambiguity inherent in HyperTalk's design has led
to a great many confusing moments for many people over the last couple
decades.
--
Richard Gaskin
Fourth World Media Corporation
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[EMAIL PROTECTED] http://www.FourthWorld.com
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