problems subclassing Gtk::Notebook

[Akos Maroy <darkeye tyrell hu>]

Hi,

I'm trying to create a custom implementation of Gtk::Notebook, and I'm 
having great difficulties.

for one, I wanted to catch the event of a new page added to the Notebook 
object. but there's no such event handler. so I considered overriding 
all the zillion prepend_page(), insert_page(), etc. functions. but none 
of them are declared as virtual, so there's no use in doing so.

as a workaround, I added a function that would create my own 
representation of the pages, that could be called explicitly. that 
seemed to be OK, but no matter what I do, the widget is rendered as the 
stock Gtk::Notebook widget. even if I override the on_realize(), 
on_expose_event(), on_map(), etc. functions. what is even more 
interesting, is that if I override all these, and call explicitly 
Gtk::Container::on_realize(), etc. from them, rendering is still done as 
the stock Gtk::Notebook does.

this seems very weird to me, and goes contrary to my C++ knowledge. how 
come that Gtk::Notebook::on_realize() can be called, if I explicitly 
call Gtk::Container::on_realize() myself?

or is it so, that Gtk::Container::on_realize() and the like check what 
kind of object this is, and execute code accordingly? well, that it's 
quite contrary to generic object inheritance logic...



Akos