=DEann 13-Okt-97 skrifar Steve Lamont:
> To subscribers of the xforms list from spl@szechuan.ucsd.edu (Steve Lam=
ont) :
>=20
>> ... One other question I have regards program
>> structure. I have about 10 different input fields in my
>> application. I presently also have a call back for each one of
>> them. This, to me, seems a bit excessive to have 10 callbacks being
>> a few lines of code each. Is there a more efficient way of doing
>> this? Is it possible to use the same call back for the different
>> fields that pass data to the same structure? ...
>=20
> It's possible but it may not be worth the effort.
>=20
> You need to somehow differentiate the object for which the callback is
> being called. You can do this by using the long data value passed in
> the callback arguments. Define some set of constants which identify
> the fields, set them in the `Argument' field of the fdesign Attribs
> window, and then use a switch statement to choose between them at run
> time:
>=20
I usually define a single callback for all input fields, that I
leave empty...
void dummy_cb(FL_OBJECT *ob, long data)
{
}
And then, I define two buttons to the form... an OK button, and a
Cancel button. Pressing the OK button, will activate a callback that
samples all data from input fields and put its into the structure, and
the other one does the cancelation of course :-)
-------------------------------------------------------------------------=
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Orn Einar Hansen oe.hansen@oehansen.pp.se
oehansen@daimi.aau.dk
voice+fax; +46 035 217194
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