All Fly by wire Airbus airplanes can end up in direct law in flight. On the A320 series it is a bit more common though than on the A330/340 as the architecture of the flight control computers is less sophisticated. On the A320 if you loose both flight augmentation computers (FAC) in flight you revert back into alternate law and upon landing gear extension into direct law. On the A330/340 a simple dual radio altimeter fault will have you ending up in direct law upon landing gear extension when the autopilot is switched OFF, we practice this exercise in the simulator. Low speed and high speed stability on all fly by wire Airbus can be overridden by the pilot and since alpha floor is not available in alternate and direct law the aircraft will stall.