v7

lib/v7/app/navigation/transition/fade_page_transitions_builder.dart

@@ -0,0 +1,43 @@
+import 'package:flutter/material.dart';
+
+class FadePageTransitionsBuilder extends PageTransitionsBuilder {
+
+  const FadePageTransitionsBuilder();
+
+  @override
+  Widget buildTransitions<T>(
+      PageRoute<T>? route,
+      BuildContext? context,
+      Animation<double> animation,
+      Animation<double> secondaryAnimation,
+      Widget child,
+      ) {
+    return _FadePagePageTransition(
+      animation: animation,
+      secondaryAnimation: secondaryAnimation,
+      child: child,
+    );
+  }
+}
+
+class _FadePagePageTransition extends StatelessWidget {
+
+  const _FadePagePageTransition({
+    required this.animation,
+    required this.secondaryAnimation,
+    required this.child,
+  });
+
+  final Animation<double> animation;
+  final Animation<double> secondaryAnimation;
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) {
+    var curveTween = CurveTween(curve: Curves.easeIn);
+    return FadeTransition(
+      opacity: animation.drive(curveTween),
+      child: child,
+    );
+  }
+}

lib/v7/app/navigation/transition/fade_transition_page.dart

@@ -15,8 +15,7 @@ class FadeTransitionPage<T> extends Page<T> {
   });
 
   @override
-  Route<T> createRoute(BuildContext context) =>
-      PageBasedFadeTransitionRoute<T>(this);
+  Route<T> createRoute(BuildContext context) => PageBasedFadeTransitionRoute<T>(this);
 }
 
 class PageBasedFadeTransitionRoute<T> extends PageRoute<T> {