adoptChild method
Called by subclasses when they decide a render object is a child.
Only for use by subclasses when changing their child lists. Calling this in other cases will lead to an inconsistent tree and probably cause crashes.
Implementation
@override
void adoptChild(RenderObject child) {
if (child is ChartAreaUpdateMixin) {
child._onScheduleUpdate = _onScheduleUpdate;
child._onScheduleLegendUpdate = _onScheduleLegendUpdate;
}
super.adoptChild(child);
}