method didPush

Source

@override
void didPush() {
  if (!settings.isInitialRoute) {
    BuildContext overlayContext = navigator.overlay?.context;
    assert(() {
      if (overlayContext == null) {
        throw new FlutterError(
          'Unable to find the BuildContext for the Navigator\'s overlay.\n'
          'Did you remember to pass the settings object to the route\'s '
          'constructor in your onGenerateRoute callback?'
        );
      }
      return true;
    });
    Focus.moveScopeTo(focusKey, context: overlayContext);
  }
  super.didPush();
}