import 'package:flutter/material.dart'; Route buildQuickSwitchRoute(Widget page) { return PageRouteBuilder( pageBuilder: (context, animation, secondaryAnimation) => page, transitionDuration: const Duration(milliseconds: 220), reverseTransitionDuration: const Duration(milliseconds: 200), transitionsBuilder: (context, animation, secondaryAnimation, child) { final curved = CurvedAnimation( parent: animation, curve: Curves.easeOutCubic, reverseCurve: Curves.easeInCubic, ); return FadeTransition( opacity: curved, child: SlideTransition( position: Tween( begin: const Offset(0.02, 0), end: Offset.zero, ).animate(curved), child: child, ), ); }, ); }