containsTweens method Null safety

bool containsTweens(
  1. TweenObject tweenObject
)

Returns true if this juggler contains tweens for the specified tweenObject.

Implementation

bool containsTweens(TweenObject tweenObject) {
  _AnimatableLink? link = _firstAnimatableLink;
  while (identical(link, _lastAnimatableLink) == false) {
    final animatable = link?.animatable;
    if (animatable is Tween &&
        identical(animatable.tweenObject, tweenObject)) {
      return true;
    }
    link = link?.nextAnimatableLink;
  }

  return false;
}