How can you properly implement custom transition animations that genuinely differ meaningfully based on the specific type of navigation actually occurring, such as a genuinely different transition for forward navigation compared to backward navigation?

Implementing genuinely context dependent transition animations typically involves using a fully custom PageRouteBuilder whose own transitionsBuilder function properly checks the specific current navigation direction, available through comparing the primary animation against the secondaryAnimation parameter, letting you properly implement a genuinely different specific visual transition, such as sliding in from the right for forward navigation while sliding out to the left for backward navigation, creating a genuinely more polished, considerably more directionally aware overall navigation experience for the user.

PageRouteBuilder(
  pageBuilder: (context, animation, secondaryAnimation) => screen,
  transitionsBuilder: (context, animation, secondaryAnimation, child) {
    final slideIn = Tween<Offset>(begin: Offset(1, 0), end: Offset.zero).animate(animation);
    return SlideTransition(position: slideIn, child: child);
  },
)