fix: add NavigatorPopHandler with a custom PopHandler class for handling backarrow presses in the userstory

packages/flutter_availability/lib/src/service/pop_handler.dart

@@ -0,0 +1,24 @@
+import "package:flutter/material.dart";
+
+///
+class PopHandler {
+  /// Constructor
+  PopHandler();
+
+  final List<VoidCallback> _handlers = [];
+
+  /// Registers a new handler
+  void add(VoidCallback handler) {
+    _handlers.add(handler);
+  }
+
+  /// Removes a handler
+  void remove(VoidCallback handler) {
+    _handlers.remove(handler);
+  }
+
+  /// Handles the pop
+  void handlePop() {
+    _handlers.lastOrNull?.call();
+  }
+}

packages/flutter_availability/lib/src/ui/screens/availability_modification.dart

@@ -9,11 +9,12 @@ import "package:flutter_availability/src/ui/widgets/base_page.dart";
 import "package:flutter_availability/src/ui/widgets/pause_selection.dart";
 import "package:flutter_availability/src/util/scope.dart";
 import "package:flutter_availability_data_interface/flutter_availability_data_interface.dart";
+import "package:flutter_hooks/flutter_hooks.dart";
 
 /// Screen for modifying the availabilities for a specific daterange
 /// There might already be availabilities for the selected period but they
 /// will be overwritten
-class AvailabilitiesModificationScreen extends StatefulWidget {
+class AvailabilitiesModificationScreen extends StatefulHookWidget {
   /// Constructor
   const AvailabilitiesModificationScreen({
     required this.dateRange,
@@ -62,6 +63,11 @@ class _AvailabilitiesModificationScreenState
     var spacing = options.spacing;
     var translations = options.translations;
 
+    useEffect(() {
+      availabilityScope.popHandler.add(widget.onExit);
+      return () => availabilityScope.popHandler.remove(widget.onExit);
+    });
+
     // TODO(freek): the selected period might be longer than 1 month
     //so we need to get all the availabilites through a stream
     Future<void> onSave() async {
@@ -180,7 +186,7 @@ class _AvailabilitiesModificationScreenState
   }
 }
 
-class _AvailabilitiesModificationScreenLayout extends StatelessWidget {
+class _AvailabilitiesModificationScreenLayout extends HookWidget {
   const _AvailabilitiesModificationScreenLayout({
     required this.dateRange,
     required this.clearAvailability,

packages/flutter_availability/lib/src/ui/screens/availability_overview.dart

@@ -17,7 +17,7 @@ class AvailabilityOverview extends StatefulHookWidget {
   });
 
   /// Callback for when the user gives an availability range
-  final void Function(
+  final Future<void> Function(
     DateTimeRange range,
     List<AvailabilityWithTemplate> selectedAvailabilities,
   ) onEditDateRange;
@@ -49,6 +49,11 @@ class _AvailabilityOverviewState extends State<AvailabilityOverview> {
       [_selectedDate],
     );
 
+    useEffect(() {
+      availabilityScope.popHandler.add(widget.onExit);
+      return () => availabilityScope.popHandler.remove(widget.onExit);
+    });
+
     var availabilitySnapshot = useStream(availabilityStream);
 
     var selectedAvailabilities = [
@@ -94,14 +99,16 @@ class _AvailabilityOverviewState extends State<AvailabilityOverview> {
 
     VoidCallback? onButtonPress;
     if (_selectedRange != null) {
-      onButtonPress = () {
-        widget.onEditDateRange(
+      onButtonPress = () async {
+        await widget.onEditDateRange(
           _selectedRange!,
           selectedAvailabilities,
         );
-        setState(() {
-          _selectedRange = null;
-        });
+        if (mounted) {
+          setState(() {
+            _selectedRange = null;
+          });
+        }
       };
     }
 

packages/flutter_availability/lib/src/ui/screens/template_day_modification.dart

@@ -7,9 +7,10 @@ import "package:flutter_availability/src/ui/widgets/template_name_input.dart";
 import "package:flutter_availability/src/ui/widgets/template_time_break.dart";
 import "package:flutter_availability/src/util/scope.dart";
 import "package:flutter_availability_data_interface/flutter_availability_data_interface.dart";
+import "package:flutter_hooks/flutter_hooks.dart";
 
 /// Page for creating or editing a day template
-class DayTemplateModificationScreen extends StatefulWidget {
+class DayTemplateModificationScreen extends StatefulHookWidget {
   /// Constructor
   const DayTemplateModificationScreen({
     required this.template,
@@ -50,6 +51,11 @@ class _DayTemplateModificationScreenState
     var options = availabilityScope.options;
     var translations = options.translations;
 
+    useEffect(() {
+      availabilityScope.popHandler.add(widget.onExit);
+      return () => availabilityScope.popHandler.remove(widget.onExit);
+    });
+
     Future<void> onDeletePressed() async {
       var isConfirmed = await options.confirmationDialogBuilder(
         context,

packages/flutter_availability/lib/src/ui/screens/template_overview.dart

@@ -41,6 +41,11 @@ class AvailabilityTemplateOverview extends HookWidget {
     var dayTemplatesSnapshot = useStream(dayTemplateStream);
     var weekTemplatesSnapshot = useStream(weekTemplateStream);
 
+    useEffect(() {
+      availabilityScope.popHandler.add(onExit);
+      return () => availabilityScope.popHandler.remove(onExit);
+    });
+
     var dayTemplates =
         dayTemplatesSnapshot.data ?? <AvailabilityTemplateModel>[];
     var weekTemplates =

packages/flutter_availability/lib/src/ui/screens/template_week_modification.dart

@@ -8,9 +8,10 @@ import "package:flutter_availability/src/ui/widgets/template_week_day_selection.
 import "package:flutter_availability/src/ui/widgets/template_week_overview.dart";
 import "package:flutter_availability/src/util/scope.dart";
 import "package:flutter_availability_data_interface/flutter_availability_data_interface.dart";
+import "package:flutter_hooks/flutter_hooks.dart";
 
 /// Page for creating or editing a day template
-class WeekTemplateModificationScreen extends StatefulWidget {
+class WeekTemplateModificationScreen extends StatefulHookWidget {
   /// Constructor
   const WeekTemplateModificationScreen({
     required this.template,
@@ -111,6 +112,11 @@ class _WeekTemplateModificationScreenState
       widget.onExit();
     }
 
+    useEffect(() {
+      availabilityScope.popHandler.add(onBackPressed);
+      return () => availabilityScope.popHandler.remove(onBackPressed);
+    });
+
     var canSave = _viewModel.canSave;
     var nextButton = options.primaryButtonBuilder(
       context,

packages/flutter_availability/lib/src/ui/widgets/pause_selection.dart

@@ -1,6 +1,7 @@
 import "package:flutter/material.dart";
 import "package:flutter_availability/flutter_availability.dart";
 import "package:flutter_availability/src/service/availability_service.dart";
+import "package:flutter_availability/src/service/pop_handler.dart";
 import "package:flutter_availability/src/ui/view_models/break_view_model.dart";
 import "package:flutter_availability/src/ui/widgets/generic_time_selection.dart";
 import "package:flutter_availability/src/ui/widgets/input_fields.dart";
@@ -32,6 +33,7 @@ class PauseSelection extends StatelessWidget {
     var availabilityScope = AvailabilityScope.of(context);
     var options = availabilityScope.options;
     var translations = options.translations;
+    var popHandler = availabilityScope.popHandler;
 
     Future<BreakViewModel?> openBreakDialog(
       BreakViewModel? initialBreak,
@@ -43,6 +45,7 @@ class PauseSelection extends StatelessWidget {
         userId: availabilityScope.userId,
         options: options,
         service: availabilityScope.service,
+        popHandler: popHandler,
         editingTemplate: editingTemplate,
       );
     }
@@ -201,6 +204,7 @@ class AvailabilityBreakSelectionDialog extends StatefulWidget {
     required AvailabilityOptions options,
     required String userId,
     required AvailabilityService service,
+    required PopHandler popHandler,
     required bool editingTemplate,
     BreakViewModel? initialBreak,
   }) async =>
@@ -217,6 +221,7 @@ class AvailabilityBreakSelectionDialog extends StatefulWidget {
           userId: userId,
           options: options,
           service: service,
+          popHandler: popHandler,
           child: AvailabilityBreakSelectionDialog(
             initialBreak: initialBreak,
             editingTemplate: editingTemplate,

packages/flutter_availability/lib/src/userstories.dart

@@ -2,6 +2,7 @@ import "package:flutter/material.dart";
 import "package:flutter_availability/src/config/availability_options.dart";
 import "package:flutter_availability/src/routes.dart";
 import "package:flutter_availability/src/service/availability_service.dart";
+import "package:flutter_availability/src/service/pop_handler.dart";
 import "package:flutter_availability/src/util/scope.dart";
 
 /// This pushes the availability user story to the navigator stack.
@@ -58,15 +59,21 @@ class _AvailabilityUserStoryState extends State<AvailabilityUserStory> {
     dataInterface: widget.options.dataInterface,
   );
 
+  late final PopHandler _popHandler = PopHandler();
+
   @override
   Widget build(BuildContext context) => AvailabilityScope(
         userId: widget.userId,
         options: widget.options,
         service: _service,
-        child: Navigator(
-          onGenerateInitialRoutes: (state, route) => [
-            homePageRoute(widget.onExit ?? () {}),
-          ],
+        popHandler: _popHandler,
+        child: NavigatorPopHandler(
+          onPop: _popHandler.handlePop,
+          child: Navigator(
+            onGenerateInitialRoutes: (state, route) => [
+              homePageRoute(widget.onExit ?? () {}),
+            ],
+          ),
         ),
       );
 

packages/flutter_availability/lib/src/util/scope.dart

@@ -1,6 +1,7 @@
 import "package:flutter/widgets.dart";
 import "package:flutter_availability/src/config/availability_options.dart";
 import "package:flutter_availability/src/service/availability_service.dart";
+import "package:flutter_availability/src/service/pop_handler.dart";
 
 ///
 class AvailabilityScope extends InheritedWidget {
@@ -9,6 +10,7 @@ class AvailabilityScope extends InheritedWidget {
     required this.userId,
     required this.options,
     required this.service,
+    required this.popHandler,
     required super.child,
     super.key,
   });
@@ -22,6 +24,9 @@ class AvailabilityScope extends InheritedWidget {
   ///
   final AvailabilityService service;
 
+  ///
+  final PopHandler popHandler;
+
   @override
   bool updateShouldNotify(AvailabilityScope oldWidget) =>
       oldWidget.userId != userId || options != options;