On 12/16/2011 02:52 PM, jjacky wrote: > Thanks. I will have a look into Vala, although for projects I have > planned, I really want/need to be using C.
Precisely. Vala makes the C Gobjects. You could use Vala to construct a class with a bunch of empty methods and then use the generated C code and fill in your code, abandoning the vala as a scaffold. > And while GTK is oriented-object, it is written in C and, AFAIK, there > are no such things as classes in C? "Classes" and other Object-oriented things are merely syntactic sugar in any language. GTK is certainly object-oriented through and through with all the classic aspects of Polymorphism, inheritance, and encapsulation. > I believe the way to create a widget based on/extending another one is > how I have done so far (based on the docs /tutorials I read), only I'm > not sure how to properly do things like "overriding" functions to change > behaviors or add features. Overriding methods is done through the GOBject's vtable. Virtual methods (as in C++) are dispatched through a function table. In the raw C code of GTK objects, this is a special struct. At least the way it used to work in GTK (my knowledge is a bit rusty) was that one struct contained the object's data, and this other stuct (sometimes called a 'klass' struct), contained the vtable. Any call to a virtual method would, using the object struct pointer itself, look up the klass structure, and look up the method to call (classic polymorphism). > > If Vala allows to do that easily and does produce C code though, I might > try and see how it does/what code it produces, but I'm not sure learning > a new language is something I wanna get into right now... Sure. as I said in my e-mail GTK developers used to use a tool called gob to create GObject-based classes, but that also has a pseudo-language. That said, working with GOBjects in C requires a lot of boilerplate code (to implement the object-orientedness), so using Vala or GOB (whatever the latest incarnation is), seems like a good idea to me, specially if you want to make your own classes and inherit, etc. _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
