Creates a closure to invoke the function called function_name
.
This is using the create_closure
implementation of this's [iface@Gtk.BuilderScope].
If no closure could be created, null will be returned and throws will be set.
this |
a `GtkBuilder` |
function_name |
name of the function to look up |
flags |
closure creation flags |
object |
Object to create the closure with |
A new closure for invoking |