Queries the type of the parameter that must be given when activating action.
When activating the action using gio.action.Action.activate, the #GVariant given to that function must be of the type returned by this function.
In the case that this function returns null, you must not give any #GVariant, but null instead.
the parameter type
Queries the type of the parameter that must be given when activating action.
When activating the action using gio.action.Action.activate, the #GVariant given to that function must be of the type returned by this function.
In the case that this function returns null, you must not give any #GVariant, but null instead.