Re: [Glade-devel][glade--] C++ signal parameter, was: glade-- and gtkmm-1.3

[Christof Petig <christof petig-baender de>]

[Hi James,

I ask for 2 glade-- specific strings per signal, the proposed names are
'data' and 'datatype(s)', which might sound familiar (deleted in 
glade-2). IIRC adding additional glademm properties to a _widget_ is no 
problem with the new DTD.

While talking to you ... , who does maintain libglademm, it's quite 
confusing to me. I'd love to discuss some technical aspects of C++ 
callback/class support again (so libglademm and glademm get more close).

   Christof (glade-- maintainer)]

Damon Chaplin wrote:
> On Thu, 2002-04-18 at 02:26, Christof Petig wrote:
>
> > Damon Chaplin wrote:
> >
> >
> > > The new DTD doesn't support setting any data parameters for signals, I'm
> > > afraid.
> >
> > That's a K.O. criterium for me. Why did you delete it? I admit that 
> > parameter passing is hackish in C.
>
>
> James Henstridge (libglade author) wrote the new DTD.
>
> Though I've always disliked using the data parameter in Glade.
>
> But if you can convince us that it is essential in C++ I think we'd add
> it back.

Did you never need it?

Well actually, since in C++ you can pass any parameter (and even a 
couple of them) and the parameter is type checked at compile time and 
even structures (or classes) are allowed, it's one of the most used 
features in C++ (since C++ and Gtk-- do the dirty work for you). It 
drastically reduces the number of different callback names which link to 
a _slightly_ modified code.

But I admit it's pain to do argument passing (read: allocation, passing 
as a void*, recasting, freeing and perhaps reference counting) in C.

<OT>
As you hear I'm strongly biased towards C++, I would never again torture 
me writing and debugging C code ;-) So [it get's offtopic] I second the 
C# proposal. It buys half of C++'s ease at the cost of using a MS 
designed technology. Yes, C++ has pits but I don't think it has more 
than C, only the syntax is (slightly) more complicated.
</OT>

For now simply adding 2 glademm specific string parameters per callback 
 would solve my needs.


> It would be impossible without support in Glade and the DTD, really.

Should I contact James Henstridge? Seems to be the best.

> > By the way, how to convert glade-1 files to glade-2?
>
>
> libglade has a libglade-convert program to do the conversion. But you
> need Python > 2, with XML support.

Thank you for the pointer, no problem for me (using debian/unstable).

   Christof