reverse method
Starts running this animation in reverse (towards the beginning).
Returns a TickerFuture that completes when the animation is dismissed.
The most recently returned TickerFuture, if any, is marked as having been canceled, meaning the future never completes and its TickerFuture.orCancel derivative future completes with a TickerCanceled error.
During the animation, status is reported as AnimationStatus.reverse,
which switches to AnimationStatus.dismissed when lowerBound
is
reached at the end of the animation.
Implementation
TickerFuture reverse({double? from}) {
return _controller.reverse(from: from);
}