public class bool query_action (uint index_, out Type owner, out string action_name, out VariantType? parameter_type, out string? property_name)
Queries the actions that have been installed for a widget class using [method@Gtk.
WidgetClass.install_action] during class initialization.
Note that this function will also return actions defined by parent classes. You can identify those by looking at
a `GtkWidget` class
position of the action to query
return location for the type where the action was defined
return location for the action name
return location for the parameter type
return location for the property name
true if the action was found, false if