onInit method
Called immediately after the widget is allocated in memory. You might use this to initialize something for the controller.
Implementation
@override
void onInit() {
  super.onInit();
  scroll.addListener(_listener);
}Called immediately after the widget is allocated in memory. You might use this to initialize something for the controller.
@override
void onInit() {
  super.onInit();
  scroll.addListener(_listener);
}