Re: Extra callback parameters

[Tristan Van Berkom <vantr touchtunes com>]

mrada wrote:

> > g_signal_connect(G_OBJECT(colbutton),"clicked",G_CALLBACK(colour_cb),cdata);
> >    
>
> Where does one find the signal names, like "clicked", above?

A signal "belongs" to a class.

A signal is normaly created in the  <libname>_<classname>_class_init(); 
function
(example gtk_button_class_init(); )

A class normaly has a source & a header file to define itself in the 
file: <libname><classname>.[ch]
(example gtkbutton.c & gtkbutton.h)

So, seeing as "clicked" is a "signal" belonging to the "class" button
(the button class handles "button_press_event" and 
"button_release_event" and
provides the "clicked" signal), you'll find the definition of the 
button's "clicked"
signal in gtkbutton.c in the function gtk_button_class_init().

Furthermore, If I'm not mistaken, any amount of classes in gtk are 
allowed to
create/define and "own" a signal with the same name so long as a parent 
class
has not already declared a signal with that name.

Regards,
                                   -Tristan