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filcnaplo_desktop_ui/lib/screens/navigation/navigation_route_handler.dart

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+import 'package:animations/animations.dart';
+import 'package:filcnaplo_desktop_ui/pages/absences/absences_page.dart';
+import 'package:filcnaplo_desktop_ui/pages/grades/grades_page.dart';
+import 'package:filcnaplo_desktop_ui/pages/home/home_page.dart';
+import 'package:filcnaplo_desktop_ui/pages/messages/messages_page.dart';
+import 'package:filcnaplo_desktop_ui/pages/timetable/timetable_page.dart';
+import 'package:flutter/material.dart';
+
+Route navigationRouteHandler(RouteSettings settings) {
+  switch (settings.name) {
+    case "grades":
+      return navigationPageRoute((context) => const GradesPage());
+    case "timetable":
+      return navigationPageRoute((context) => const TimetablePage());
+    case "messages":
+      return navigationPageRoute((context) => const MessagesPage());
+    case "absences":
+      return navigationPageRoute((context) => const AbsencesPage());
+    case "home":
+    default:
+      return navigationPageRoute((context) => const HomePage());
+  }
+}
+
+Route navigationPageRoute(Widget Function(BuildContext) builder) {
+  return PageRouteBuilder(
+    pageBuilder: (context, _, __) => builder(context),
+    transitionsBuilder: (context, animation, secondaryAnimation, child) {
+      return FadeThroughTransition(
+        fillColor: Theme.of(context).scaffoldBackgroundColor,
+        animation: animation,
+        secondaryAnimation: secondaryAnimation,
+        child: child,
+      );
+    },
+  );
+}