quick update for future reference :
I found the solution to my problem. Its explained well in gnome docs
basically, we just have to hook 'Gegloperation' object instance for signal
But, again whenever we change any property value. all the values of the
operation values will set not just the one which is changed. I came to know
about this when i tried to hook by overriding 'set_property'. so if I
understood correctly we can't hook the signal to know which property is
changed. It seems logical as Gegl is separated from host program.

correct me if I'm wrong.

On Wed, Apr 29, 2015 at 11:19 AM, Akash Hiremath <akashh...@gmail.com>

> hi,
> I want to hook "notify" signal emitted by GeglOperation properties. But
> for that I need operation's 'properties' gobject. I can easily hook for
> 'GeglOperation' since its a 'gobject' instance but how can I hook for a
> property? I tried hook by GValue by 'g_object_get'. also tried to hook by
> 'g_object_class_find_property()' which returns a 'GParamSpecInt' type of
> value. as expected it didn't work as they aren't gobjects.
> In short how can I get properties 'gobject' instance? I checked gonme
> developer site, gobject's documentation still no luck.
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