v3

lib/v2/transition/fade_transition_page.dart

@@ -0,0 +1,53 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class FadeTransitionPage<T> extends Page<T> {
+  final Widget child;
+  final Duration duration;
+
+  const FadeTransitionPage({
+    super.key,
+    required this.child,
+    this.duration = const Duration(milliseconds: 300),
+  });
+
+  @override
+  Route<T> createRoute(BuildContext context) =>
+      PageBasedFadeTransitionRoute<T>(this);
+}
+
+class PageBasedFadeTransitionRoute<T> extends PageRoute<T> {
+  final FadeTransitionPage<T> _page;
+
+  PageBasedFadeTransitionRoute(this._page) : super(settings: _page);
+
+  @override
+  Color? get barrierColor => null;
+
+  @override
+  String? get barrierLabel => null;
+
+  @override
+  Duration get transitionDuration => _page.duration;
+
+  @override
+  bool get maintainState => true;
+
+  @override
+  Widget buildPage(BuildContext context, Animation<double> animation,
+      Animation<double> secondaryAnimation) {
+    var curveTween = CurveTween(curve: Curves.easeIn);
+    return FadeTransition(
+      opacity: animation.drive(curveTween),
+      child: (settings as FadeTransitionPage).child,
+    );
+  }
+
+  @override
+  Widget buildTransitions(BuildContext context, Animation<double> animation,
+          Animation<double> secondaryAnimation, Widget child) =>
+      child;
+}

lib/v2/transition/no_transition_page.dart

@@ -0,0 +1,47 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class NoTransitionPage<T> extends Page<T> {
+  final Widget child;
+
+  const NoTransitionPage({
+    super.key,
+    required this.child,
+  });
+
+  @override
+  Route<T> createRoute(BuildContext context) => NoTransitionRoute<T>(this);
+}
+
+class NoTransitionRoute<T> extends PageRoute<T> {
+
+  final NoTransitionPage<T> _page;
+
+  NoTransitionRoute(this._page) : super(settings: _page);
+
+  @override
+  Color? get barrierColor => null;
+
+  @override
+  String? get barrierLabel => null;
+
+  @override
+  Duration get transitionDuration => const Duration(milliseconds: 0);
+
+  @override
+  bool get maintainState => true;
+
+  @override
+  Widget buildPage(BuildContext context, Animation<double> animation,
+      Animation<double> secondaryAnimation) {
+    return (settings as NoTransitionPage).child;
+  }
+
+  @override
+  Widget buildTransitions(BuildContext context, Animation<double> animation,
+          Animation<double> secondaryAnimation, Widget child) =>
+      child;
+}