setup
Description:
Emitted when a newly created listitem needs to be prepared for use.
It is the first signal emitted for every listitem.
The handler for this signal must call [method@Gtk.ListItem.set_child] to populate the listitem with widgets.
The [signal@Gtk.SignalListItemFactory:GtkSignalListItemFactory:teardown] signal is the opposite of this signal and can be used to
undo everything done in this signal.
Parameters:
| object |
the `GObject` to set up |