createBallisticSimulation method

@override Simulation? createBallisticSimulation(ScrollMetrics position, double velocity)

See IndicatorNotifier.createBallisticSimulation.

Implementation

@override
Simulation? createBallisticSimulation(
    ScrollMetrics position, double velocity) {
  final mVelocity =
      hasSecondary && !noMoreLocked && _offset >= actualSecondaryTriggerOffset
          ? -secondaryVelocity
          : velocity;
  if (_offset > 0) {
    return BouncingScrollSimulation(
      spring: spring,
      position:
          clamping ? position.minScrollExtent - _offset : position.pixels,
      velocity: mVelocity,
      leadingExtent: position.minScrollExtent - overExtent,
      trailingExtent: 0,
      tolerance: _physics.toleranceFor(position),
    );
  }
  return null;
}