Add scroll wheel support for intro screen

lib/ui/screens/intro/intro_screen.dart

@@ -1,6 +1,7 @@
+import 'package:flutter/gestures.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 import 'package:wonders/common_libs.dart';
-import 'package:wonders/ui/common/app_icons.dart';
+  import 'package:wonders/ui/common/app_icons.dart';
 import 'package:wonders/ui/common/controls/app_page_indicator.dart';
 import 'package:wonders/ui/common/gradient_container.dart';
 import 'package:wonders/ui/common/static_text_scale.dart';
@@ -25,6 +26,8 @@ class _IntroScreenState extends State<IntroScreen> {
   late final PageController _pageController = PageController()..addListener(_handlePageChanged);
   final ValueNotifier<int> _currentPage = ValueNotifier(0);
   bool get _isOnLastPage => _currentPage.value.round() == pageData.length - 1;
+  bool get _isOnFirstPage => _currentPage.value.round() == 0;
+
   @override
   void dispose() {
     _pageController.dispose();
@@ -48,12 +51,17 @@ class _IntroScreenState extends State<IntroScreen> {
         duration: $styles.times.fast, curve: Curves.easeOut);
   }
 
-  void _handleNavTextDoubleTapped() {
+  void _handleNavTextSemanticTap() => _incrementPage(1);
+
+  void _incrementPage(int dir){
     final int current = _pageController.page!.round();
-    if (_isOnLastPage) return;
-    _pageController.animateToPage(current + 1, duration: 250.ms, curve: Curves.easeIn);
+    if (_isOnLastPage && dir > 0) return;
+    if (_isOnFirstPage && dir < 0) return;
+    _pageController.animateToPage(current + dir, duration: 250.ms, curve: Curves.easeIn);
   }
 
+  void _handleScrollWheel(double delta) => _incrementPage(delta >0? 1 : -1);
+
   @override
   Widget build(BuildContext context) {
     // Set the page data, as strings may have changed based on locale
@@ -70,7 +78,13 @@ class _IntroScreenState extends State<IntroScreen> {
     final List<Widget> pages = pageData.map((e) => _Page(data: e)).toList();
 
     /// Return resulting widget tree
-    return DefaultTextColor(
+    return Listener(
+      onPointerSignal: (signal){
+        if(signal is PointerScrollEvent){
+          _handleScrollWheel(signal.scrollDelta.dy);
+        }
+      },
+      child: DefaultTextColor(
         color: $styles.colors.offWhite,
         child: Container(
           color: $styles.colors.black,
@@ -164,6 +178,7 @@ class _IntroScreenState extends State<IntroScreen> {
             ),
           ),
         ),
+      ),
     );
   }
 
@@ -215,7 +230,7 @@ class _IntroScreenState extends State<IntroScreen> {
           duration: $styles.times.fast,
           child: Semantics(
             onTapHint: $strings.introSemanticNavigate,
-            onTap: _isOnLastPage ? null : _handleNavTextDoubleTapped,
+            onTap: _isOnLastPage ? null : _handleNavTextSemanticTap,
             child: Text($strings.introSemanticSwipeLeft, style: $styles.text.bodySmall),
           ),
         );

pubspec.yaml

@@ -1,7 +1,7 @@
 name: wonders
 description: Explore the famous wonders of the world.
 publish_to: "none"
-version: 2.0.16+5
+version: 2.0.17+6
 
 environment:
   sdk: ">=2.17.0 <3.0.0"