Re: How to use specific methods with a generic widget pointer?

[Guillaume Brocker <guillaume brocker digital-trainers com>]

Paulo Flabiano Smorigo a écrit :
> Hi Guillaume,
>
> Thanks for the fast reply...
>
> I know that the Gtk::Widget don't have the set_active() member but as
> it is pointing to a ToggleButton widget, isn't it possible to use the
> method?
>
> I there a someway to make the pointer accept the method?

You can cast the pointer to obtain a "Gtk::ToggleButton *" using 
"dynamic_cast" c++ operator. The code may look like this :

dynamic_cast< Gtk::ToggleButton* >( ptrElement )->set_active(true);

But, you must be aware that "dynamic_cast" will return a null pointer if 
ptrElement does not point to a Gtk::ToggleButton (or derived) instance. 
You should then check the pointer prior call "set_active".

Guillaume