fix: improve scroll handling on home page to avoid unintentional scroll event detection

lib/src/screens/home/content.dart

@@ -8,9 +8,11 @@ import 'package:furman_now/src/widgets/scroll_view_height.dart';
 
 class HomeContent extends StatefulWidget {
   final bool collapse;
+  final ScrollController controller;
 
   const HomeContent({
     required this.collapse,
+    required this.controller,
     Key? key,
   }) : super(key: key);
 
@@ -19,13 +21,12 @@ class HomeContent extends StatefulWidget {
 }
 
 class _HomeContentState extends State<HomeContent> {
-  final ScrollController _controller = ScrollController();
   bool _collapse = false;
 
   @override
   Widget build(BuildContext context) {
     if (widget.collapse != _collapse) {
-      _controller.animateTo(
+      widget.controller.animateTo(
         0,
         duration: const Duration(milliseconds: 400),
         curve: Curves.easeInOut,
@@ -35,7 +36,7 @@ class _HomeContentState extends State<HomeContent> {
 
     return LayoutBuilder(
       builder: (context, constraints) => ScrollViewWithHeight(
-        controller: _controller,
+        controller: widget.controller,
         child: Align(
           alignment: Alignment.bottomCenter,
           child: TweenAnimationBuilder<double>(
@@ -50,7 +51,10 @@ class _HomeContentState extends State<HomeContent> {
                   decoration: const BoxDecoration(
                     color: Colors.white,
                     borderRadius:
-                    BorderRadius.vertical(top: Radius.circular(30)),
+                      BorderRadius.vertical(
+                        top: Radius.circular(30),
+                        bottom: Radius.circular(30),
+                      ),
                   ),
                   padding: const EdgeInsets.only(bottom: 15),
                   margin: EdgeInsets.only(top: margin),

lib/src/screens/home/home_header.dart

@@ -44,6 +44,7 @@ class HomePageHeader extends StatelessWidget {
                       color: Color(0xff26183d),
                       fontSize: 36,
                       fontWeight: FontWeight.w800,
+                      height: 1.2,
                     )),
                   ),
                 ),

lib/src/screens/home/index.dart

@@ -1,5 +1,6 @@
 import 'package:auto_route/auto_route.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:furman_now/src/routes/index.gr.dart';
 import 'package:furman_now/src/screens/home/content.dart';
 import 'package:furman_now/src/screens/home/state.dart';
@@ -13,75 +14,124 @@ class HomeScreen extends StatefulWidget {
 }
 
 class _HomeScreenState extends State<HomeScreen> {
-  bool _collapse = false;
+  final ScrollController _controller = ScrollController();
+
+  double overscrollTopAmount = 0;
+  double overscrollBottomAmount = 0;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _controller.addListener(updateScrollPosition);
+  }
+
+  updateScrollPosition() {
+    // bottom overscroll
+    if (_controller.position.pixels > _controller.position.maxScrollExtent) {
+      setState(() {
+        overscrollBottomAmount =
+            _controller.position.pixels - _controller.position.maxScrollExtent;
+      });
+    } else {
+      if (overscrollBottomAmount != 0) {
+        setState(() {
+          overscrollBottomAmount = 0;
+        });
+      }
+    }
+
+    // top overscroll
+    if (_controller.position.pixels < 0) {
+      setState(() {
+        overscrollTopAmount =
+            _controller.position.pixels.abs();
+      });
+    } else {
+      if (overscrollTopAmount != 0) {
+        setState(() {
+          overscrollTopAmount = 0;
+        });
+      }
+    }
+  }
+
+  handleScrollEvent(BuildContext context) {
+    const scrollMessageSensitivity = 20;
+    const pageSwitchSensitivity = 60;
+    var offsetAmount = overscrollTopAmount.abs();
+
+    if (overscrollTopAmount != 0) {
+      if (offsetAmount > pageSwitchSensitivity) {
+        context.router.navigate(const StudentIdRoute());
+        context.read<HomePageState>().collapse = true;
+      } else if (offsetAmount > scrollMessageSensitivity) {
+        context.read<HomePageState>().showScrollMessage = true;
+      } else {
+        context.read<HomePageState>().showScrollMessage = false;
+      }
+    } else {
+      context.read<HomePageState>().showScrollMessage = false;
+
+      if (_controller.position.pixels > pageSwitchSensitivity) {
+        context.router.navigate(const HomeRoute());
+        context.read<HomePageState>().collapse = false;
+      }
+    }
+  }
 
   @override
   Widget build(BuildContext context) {
     return ChangeNotifierProvider(
       create: (context) => HomePageState(),
       builder: (context, _) => Scaffold(
-        body: Container(
-          color: const Color(0xffb7acc9),
-          child: SafeArea(
+          body: AnnotatedRegion<SystemUiOverlayStyle>(
+            value: SystemUiOverlayStyle.light,
             child: Container(
               color: const Color(0xffb7acc9),
-              child: Stack(
-                fit: StackFit.loose,
-                children: [
-                  const AutoTabsRouter(
-                    routes: [
-                      HomeRoute(),
-                      StudentIdRoute(),
+              child: SafeArea(
+                child: Container(
+                  color: const Color(0xffb7acc9),
+                  child: Stack(
+                    fit: StackFit.loose,
+                    children: [
+                      // overscroll indicator color
+                      Align(
+                        alignment: Alignment.bottomCenter,
+                        child: Container(
+                          height: overscrollBottomAmount + 30,
+                          color: Colors.grey.shade50,
+                        ),
+                      ),
+                      const AutoTabsRouter(
+                        routes: [
+                          HomeRoute(),
+                          StudentIdRoute(),
+                        ],
+                      ),
+                      NotificationListener<ScrollNotification>(
+                        onNotification: (notification) {
+                          if (notification is ScrollUpdateNotification) {
+                            handleScrollEvent(context);
+                          }
+                          return true;
+                        },
+                        child: Consumer<HomePageState>(
+                          builder: (context, state, _) =>
+                            ClipRect(child: HomeContent(
+                              controller: _controller,
+                              collapse: state.collapse,
+                            ),
+                          ),
+                        ),
+                      ),
                     ],
                   ),
-                  NotificationListener<ScrollNotification>(
-                    onNotification: (notification) {
-                      if (notification is ScrollUpdateNotification) {
-                        final offset = notification.metrics.pixels;
-                        const scrollMessageSensitivity = 20;
-                        const pageSwitchSensitivity = 60;
-                        if (offset < 0) {
-                          var offsetAmount = offset.abs();
-                          if (offsetAmount > pageSwitchSensitivity) {
-                            context.router.navigate(const StudentIdRoute());
-                            setState(() {
-                              _collapse = true;
-                            });
-                          } else if (offsetAmount > scrollMessageSensitivity) {
-                            if (!context.read<HomePageState>().showScrollMessage) {
-                              context.read<HomePageState>().showScrollMessage = true;
-                            }
-                          } else {
-                            if (context.read<HomePageState>().showScrollMessage) {
-                              context.read<HomePageState>().showScrollMessage = false;
-                            }
-                          }
-                        } else {
-                          var offsetAmount = offset.abs();
-                          if (offsetAmount > pageSwitchSensitivity) {
-                            context.router.navigate(const HomeRoute());
-                            setState(() {
-                              _collapse = false;
-                            });
-                          } else {
-                            if (context.read<HomePageState>().showScrollMessage) {
-                              context.read<HomePageState>().showScrollMessage = false;
-                            }
-                          }
-                        }
-                      }
-                      return true;
-                    },
-                    child: ClipRect(child: HomeContent(
-                      collapse: _collapse,
-                    )),
-                  ),
-                ],
+                ),
               ),
             ),
           ),
         ),
-      ),
     );
   }
 }

lib/src/screens/home/state.dart

@@ -2,13 +2,21 @@ import 'package:flutter/material.dart';
 
 class HomePageState extends ChangeNotifier {
   bool _showScrollMessage = false;
+  bool _collapse = false;
 
-  bool get showScrollMessage {
-    return _showScrollMessage;
+  bool get showScrollMessage { return _showScrollMessage; }
+  set showScrollMessage(bool value) {
+    if (value != _showScrollMessage) {
+      _showScrollMessage = value;
+      notifyListeners();
+    }
   }
 
-  set showScrollMessage(bool value) {
-    _showScrollMessage = value;
-    notifyListeners();
+  bool get collapse { return _collapse; }
+  set collapse(bool value) {
+    if (value != _collapse) {
+      _collapse = value;
+      notifyListeners();
+    }
   }
 }

lib/src/widgets/home/restaurants/restaurants_list.dart

@@ -29,6 +29,7 @@ class _RestaurantsListState extends State<RestaurantsList> {
                   itemCount: restaurants.length,
                   cacheExtent: 10000,
                   scrollDirection: Axis.horizontal,
+                  physics: const BouncingScrollPhysics(),
                   prototypeItem: Padding(
                     padding: const EdgeInsets.only(right: 15),
                     child: RestaurantCard(restaurant: restaurants.first),