OptionalcallbacksOptionaldataInline XML interface description. Calls add_from_string on construction.
OptionalfilenamePath to a UI file. Calls add_from_file on construction.
OptionalobjectsPre-existing objects exposed to the UI via Builder.exposeObjects.
OptionalresourceResource path to a UI file. Calls add_from_resource on construction.
Named signal callbacks resolved against
<signal>handlerattributes.