animateTo method Null safety

Future<void> animateTo(
  1. double offset,
  2. {required Duration duration,
  3. required Curve curve}

Animates the position from its current value to the given value.

Any active animation is canceled. If the user is currently scrolling, that action is canceled.

The returned Future will complete when the animation ends, whether it completed successfully or whether it was interrupted prematurely.

An animation will be interrupted whenever the user attempts to scroll manually, or whenever another activity is started, or whenever the animation reaches the edge of the viewport and attempts to overscroll. (If the ScrollPosition does not overscroll but instead allows scrolling beyond the extents, then going beyond the extents will not interrupt the animation.)

The animation is indifferent to changes to the viewport or content dimensions.

Once the animation has completed, the scroll position will attempt to begin a ballistic activity in case its value is not stable (for example, if it is scrolled beyond the extents and in that situation the scroll position would normally bounce back).

The duration must not be zero. To jump to a particular value without an animation, use jumpTo.

When calling animateTo in widget tests, awaiting the returned Future may cause the test to hang and timeout. Instead, use WidgetTester.pumpAndSettle.


Future<void> animateTo(
  double offset, {
  required Duration duration,
  required Curve curve,
}) async {
  assert(_positions.isNotEmpty, 'ScrollController not attached to any scroll views.');
  await Future.wait<void>(<Future<void>>[
    for (int i = 0; i < _positions.length; i += 1) _positions[i].animateTo(offset, duration: duration, curve: curve),