on
Called when the given BaseTransientBottomBar has been dismissed, either through a time-out, having been manually dismissed, or an action being clicked.
Parameters
transient
The transient bottom bar which has been dismissed.
event
The event which caused the dismissal. One of either: DISMISS_EVENT_SWIPE, DISMISS_EVENT_ACTION, DISMISS_EVENT_TIMEOUT, DISMISS_EVENT_MANUAL or DISMISS_EVENT_CONSECUTIVE.