Delete material.dart

-import 'package:flutter/cupertino.dart';
-import 'package:flutter/material.dart';
-
-/// A modal route that replaces the entire screen with a platform-adaptive
-/// transition.
-///
-/// For Android, the entrance transition for the page slides the page upwards
-/// and fades it in. The exit transition is the same, but in reverse.
-///
-/// The transition is adaptive to the platform and on iOS, the page slides in
-/// from the right and exits in reverse. The page also shifts to the left in
-/// parallax when another page enters to cover it. (These directions are flipped
-/// in environments with a right-to-left reading direction.)
-///
-/// By default, when a modal route is replaced by another, the previous route
-/// remains in memory. To free all the resources when this is not necessary, set
-/// [maintainState] to false.
-///
-/// The `fullscreenDialog` property specifies whether the incoming page is a
-/// fullscreen modal dialog. On iOS, those pages animate from the bottom to the
-/// top rather than horizontally.
-///
-/// The type `T` specifies the return type of the route which can be supplied as
-/// the route is popped from the stack via [Navigator.pop] by providing the
-/// optional `result` argument.
-///
-/// See also:
-///
-///  * [PageTransitionsTheme], which defines the default page transitions used
-///    by [MaterialPageRoute.buildTransitions].
-class GetRoute<T> extends PageRoute<T> {
-  /// Construct a MaterialPageRoute whose contents are defined by [builder].
-  ///
-  /// The values of [builder], [maintainState], and [fullScreenDialog] must not
-  /// be null.
-  GetRoute({
-    @required this.builder,
-    RouteSettings settings,
-    this.opaque = true,
-    this.maintainState = true,
-    bool fullscreenDialog = false,
-  }) : assert(builder != null),
-        assert(maintainState != null),
-        assert(fullscreenDialog != null),
-        assert(opaque != null),
-        super(settings: settings, fullscreenDialog: fullscreenDialog);
-
-  /// Builds the primary contents of the route.
-  final WidgetBuilder builder;
-
-  @override
-  final bool maintainState;
-
-  /// Allows you to set opaque to false to prevent route reconstruction.
-  @override
-  final bool opaque;
-
-  @override
-  Duration get transitionDuration => const Duration(milliseconds: 300);
-
-  @override
-  Color get barrierColor => null;
-
-  @override
-  String get barrierLabel => null;
-
-  @override
-  bool canTransitionFrom(TransitionRoute<dynamic> previousRoute) {
-    return previousRoute is GetRoute || previousRoute is CupertinoPageRoute;
-  }
-
-  @override
-  bool canTransitionTo(TransitionRoute<dynamic> nextRoute) {
-    // Don't perform outgoing animation if the next route is a fullscreen dialog.
-    return (nextRoute is GetRoute && !nextRoute.fullscreenDialog)
-        || (nextRoute is CupertinoPageRoute && !nextRoute.fullscreenDialog);
-  }
-
-  @override
-  Widget buildPage(
-      BuildContext context,
-      Animation<double> animation,
-      Animation<double> secondaryAnimation,
-      ) {
-    final Widget result = builder(context);
-    assert(() {
-      if (result == null) {
-        throw FlutterError.fromParts(<DiagnosticsNode>[
-          ErrorSummary('The builder for route "${settings.name}" returned null.'),
-          ErrorDescription('Route builders must never return null.')
-        ]);
-      }
-      return true;
-    }());
-    return Semantics(
-      scopesRoute: true,
-      explicitChildNodes: true,
-      child: result,
-    );
-  }
-
-  @override
-  Widget buildTransitions(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation, Widget child) {
-    final PageTransitionsTheme theme = Theme.of(context).pageTransitionsTheme;
-    return theme.buildTransitions<T>(this, context, animation, secondaryAnimation, child);
-  }
-
-  @override
-  String get debugLabel => '${super.debugLabel}(${settings.name})';
-}