In pygtk custom cellrenderers were done inheriting
gtk.GenericCellRenderer, and overriding the on_* methods. Now we
inherit Gtk.CellRenderer and the methods to override changed to do_* .
The destroy signal was moved to Gtk.Widget [1] so the Gtk.CellRenderer
doesn't have it anymore. Now we do the cleanup in the python
destructor method. A testcase tests/graphics/customdestroy.py shows
how is done.
tests/graphics/cellrenderericon.py tests the usage.
Signed-off-by: Manuel Quiñones <manuq@laptop.org>
Acked-by: Simon Schampijer <simon@laptop.org>
[1] http://developer.gnome.org/gtk3/stable/ch24s02.html#id1459754
