1. override
void didPush(Route route, Route previousRoute)

The Navigator pushed the given route.

Source 

@override
void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
  assert(navigator != null);
  assert(route != null);
  if (route is PageRoute<dynamic>) {
    assert(route.animation != null);
    if (previousRoute is PageRoute<dynamic>) // could be null
      _from = previousRoute;
    _to = route;
    _animation = route.animation;
    _checkForHeroQuest();
  }
}