Re: Notebook singal connects

[muppet <scott asofyet org>]

On Jan 6, 2005, at 5:17 PM, Tyler Hepworth wrote:

> I have a notebook object with two pages on it.  I want to generate an
> event when a page is selected.  I have tried the following:
>
>     $self->{'notebook'}->signal_connect ('select-page' => sub {
>         [do some stuff here]
>     });
>
> But nothing happens.  The C API docs state that this is a signal since  
> "2.4".

iiiiiinteresting... where do you see that?  i don't see it here:

http://developer.gnome.org/doc/API/2.0/gtk/ 
GtkNotebook.html#GtkNotebook-select-page

and i see the select-page signal listed in the pod on my powerbook,  
which uses gtk+-2.2.4 from fink.

> I am using Wayne Keenan's distribution on windows which is only Gtk+  
> 2.2.4 and Gtk2 1.020.  Does the signal not work because of the  
> distribution version I am using?

To the bindings, signals and properties are different from methods and  
functions in that they are available through introspection, and thus  
simply exist in the bindings so long as they exist in the bound  
libraries.  That is, if the signal is in the version of gtk+ you're  
using, you should be able to use it regardless of what version of Gtk2  
you have.

Functions and methods are not available through introspection (although  
there has been some discussion on gtk-devel-list and language-bindings  
on how to do this), so they are only available if the bindings support  
them and are compiled for them.  That is, you can only use a function  
from 2.4 if the bindings support 2.4 *and* were compiled against 2.4   
(and provided we bound that particular function ;-).


> Is there another signal I can use?

What about switch-page?  it even gives you the current page's index.

http://developer.gnome.org/doc/API/2.0/gtk/ 
GtkNotebook.html#GtkNotebook-switch-page

The second argument of that signal is listed as gpointer in the pod but  
as a GtkNotebookPage in the docs; GtkNotebookPage is a private type (an  
opaque, or incomplete, type in the public API), and thus is unusable in  
perl.  Just ignore it.


--
She's obviously your child.  She looks like you, she talks a lot, and  
most of it is gibberish.
  -- Elysse, to me, of Zella.