RE: [wxperl-users] Re: wxValidator available via wxPerl

[James L. <ja...@mi...>]

Dear Mattia,
Thanks - this works a treat!

I was so close... Anyway, now I'm up and running.

I had noticed the 'Attempt to free unreferenced...' error - will await a
fix.

Now that I've got things working, what do you suggest/would you like?  I
feel that validators are the way to go when it comes to transferring
data to/from controls (rather than explicit GetValue/SetValue calls all
over the place) - I have had to implement a similar concept (though not
as elegant) in a very large Perl/Tk application which we have developed.

I see that you think we should create Perl versions of
wxGenericValidator and wxTextValidator - I am happy to do this and
contribute them to the project.  If I do this, do you (or anyone else on
the list) have ideas on how we should name/implement them?  What 'better
interface' can you envisage for a Perl-based Validator?  I have not
examined the native wxGenericValidator and wxTextValidator yet, so am
interested in your thoughts.

Regards,

James

> -----Original Message-----
> From: Mattia Barbon [mailto:mb...@ds...]
> Sent: 17 December 2001 22:22
> To: wxp...@li...
> Subject: RE: [wxperl-users] Re: wxValidator available via wxPerl
>=20
>=20
> > Dear Mattia (or others, if they can help),
> > I've been delving into how to use wxValidators, and I think=20
> I understand the
> > concept (and I like it!).
> >=20
> > However, I'm having real trouble deriving my own validator (called,
> > unimaginitively, myValidator) from Wx::PlValidator.
> >=20
> > >From the wxWindows documentation, all validators must=20
> implement a Clone
> > method.  I have tried implementing a Clone method, which I=20
> can see getting
> > called, but myValidator's Validate, TransferFromWindow, and=20
> TransferToWindow
> > never seem to get called.
> >=20
> > Here is my code (with the methods apart from Clone doing=20
> nothing useful
> > apart from printing to STDOUT):
> >=20
> > VVVVVVVVVVVVVVVVVVVV
> > use Wx;
> >=20
> > package myValidator;
> This is OK ( in fact the sample I sant uses this code )
>=20
> > ^^^^^^^^^^^^
> >=20
> =20
> > Could you post a very simple example of how to create a=20
> validator class in
> > Perl, and how to create a frame which uses it, please?
> Here is your example ( modified minimal sample, use Help->About to
> show the validator dialog )
>=20
> I am getting a "Attempt to free unreferenced scalar at=20
> C:/Developement/wxPerl/wxPerl/blib/lib/Wx.pm line 61.",=20
> which I was not getting when I first tested Validators.
> It is obviously something I am doing wrong with reference
> counting in wxPerl; will fix.
>=20
> A caveat: do not use a validator after you did
> ->SetValidator(); for implementation reasons,
> once you do ->SetValidator() it is no more valid.
>=20
> Regards
> Mattia
>=20
>=20
>=20
>=20