buildParent method Null safety
- ScrollPhysics? ancestor
protected">@protected
If parent is null then return ancestor, otherwise recursively build a
ScrollPhysics that has ancestor
as its parent.
This method is typically used to define applyTo methods like:
FooScrollPhysics applyTo(ScrollPhysics ancestor) {
return FooScrollPhysics(parent: buildParent(ancestor));
}
Implementation
@protected
ScrollPhysics? buildParent(ScrollPhysics? ancestor) => parent?.applyTo(ancestor) ?? ancestor;