I have been playing with a small application using the new (in gtk3) GtkSwitch
("light switch" style) widget.
The reference manual does not mention any signal specific to this widget, and
I think it would be nice to have one. I want a signal for when the state
is toggled, e.g. "switched".
I eventually (after a lot of trial and error) found I could almost do what I
needed by using the "event-after" signal, (snippet below), but with that
signal, I found that the data pointer is null (zero) on entry to my callback.
I don't know if that is because it is not really valid to use a signal with
this widget at all? or some obscure bug? or just maybe that gtk3 is a bit
new?
By the way, the trial-and-error part is that although I found many different
signal types which were delivered to my cb, the event-after was the only one
that was delivered exactly once and once only, after the user toggled the
switch.
GtkWidget *do_light_switch (GtkWidget *do_widget){ [...] GtkSwitch
*light_switch_widg; GtkImage *light_on_image;
g_signal_connect_object ( GTK_WIDGET (light_switch_widg), "event-after",
G_CALLBACK (turn_light_on_off) , GTK_WIDGET (light_on_image) ,
G_CONNECT_AFTER);
In my callback, the data pointer is 0 (confirmed with gdb) yet the pointer is
set correctly in the above g_signal_connect_object .I eventually resorted to
storing the value of the light_on_image in a static savearea and referencing it
from there in the cb :
save_light_on_image_ptr = GTK_WIDGET (light_on_image);
(which worked and also confirmed that the pointer was set correctly at the time
of the g_signal_connect_object).
Or can someone spot something I did wrong?
John Lumby
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