Re: gtkmm 3.4.0 - Gtk::Switch where is the signal "activate"?

[Kjell Ahlstedt <kjell ahlstedt bredband net>]

2012-06-19 18:00, Giuseppe Penone skrev:
> Hi,
> I would like to use the signal "activate" of the widget Gtk::Switch 
> (which I discovered through glade signals tab),
> I see that it exists in gtk 3.2: 
> http://developer.gnome.org/gtk3/3.2/GtkSwitch.html#GtkSwitch-activate
> but it is not mentioned on 
> http://developer.gnome.org/gtkmm/stable/classGtk_1_1Switch.html
> and the "m_switch.signal_activate()" causes error at compilation time.
> Cheers,
> Giuseppe.
The description of GtkSwitch-activate that you link to says 
"Applications should never connect to this signal, but use the 
notify::active signal." That's why this signal is not wrapped in gtkmm. 
I wonder if it's really a good thing that it appears in glade.

It's not obvious how to connect to the notify::active signal from a C++ 
program. I think this how to do it:

void MyWidget::on_switch_active_changed();
m_switch.property_active().signal_changed().connect(sigc::mem_fun(*this, 
&MyWidget::on_switch_active_changed));

I admit that it looks complicated. Does anyone know an easier way?

Kjell