DrivenScrollActivity constructor

DrivenScrollActivity(ScrollActivityDelegate delegate, { @required double from, @required double to, @required Duration duration, @required Curve curve, @required TickerProvider vsync })

Creates an activity that animates a scroll view based on animation parameters.

All of the parameters must be non-null.

Implementation 

DrivenScrollActivity(
  ScrollActivityDelegate delegate, {
  @required double from,
  @required double to,
  @required Duration duration,
  @required Curve curve,
  @required TickerProvider vsync,
}) : assert(from != null),
     assert(to != null),
     assert(duration != null),
     assert(duration > Duration.zero),
     assert(curve != null),
     super(delegate) {
  _completer = Completer<void>();
  _controller = AnimationController.unbounded(
    value: from,
    debugLabel: '$runtimeType',
    vsync: vsync,
  )
    ..addListener(_tick)
    ..animateTo(to, duration: duration, curve: curve)
     .whenComplete(_end); // won't trigger if we dispose _controller first
}