pump abstract method
- [Duration duration]
Called to indicate that there should be a new frame after an optional delay.
The frame is pumped after a delay of
duration is not null,
or immediately otherwise.
This is invoked by flingFrom, for instance, so that the sequence of pointer events occurs over time.
- SchedulerBinding.endOfFrame, which returns a future that could be appropriate to return in the implementation of this method.
Future<void> pump([Duration duration]);