Add prev/next navigation to intro screen

lib/ui/common/previous_next_navigation.dart

@@ -4,10 +4,20 @@ import 'package:wonders/ui/common/app_icons.dart';
 import 'package:wonders/ui/common/fullscreen_keyboard_listener.dart';
 
 class PreviousNextNavigation extends StatelessWidget {
-  const PreviousNextNavigation({super.key, this.onPreviousPressed, this.onNextPressed, required this.child});
+  const PreviousNextNavigation(
+      {super.key,
+      required this.onPreviousPressed,
+      required this.onNextPressed,
+      required this.child,
+      this.maxWidth = 1000,
+      this.nextBtnColor,
+      this.previousBtnColor});
   final VoidCallback? onPreviousPressed;
   final VoidCallback? onNextPressed;
+  final Color? nextBtnColor;
+  final Color? previousBtnColor;
   final Widget child;
+  final double? maxWidth;
 
   bool _handleKeyDown(KeyDownEvent event) {
     if (event.logicalKey == LogicalKeyboardKey.arrowLeft && onPreviousPressed != null) {
@@ -23,32 +33,40 @@ class PreviousNextNavigation extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    Widget buildBtn(String semanticLabel, VoidCallback? onPressed, Alignment align, {bool isNext = false}) {
+    if (PlatformInfo.isMobile) return child;
-      if (PlatformInfo.isMobile) return child;
+    return FullscreenKeyboardListener(
-      return FullScreenKeyboardListener(
+      onKeyDown: _handleKeyDown,
-        onKeyDown: _handleKeyDown,
+      child: Stack(
-        child: Align(
+        children: [
-          alignment: align,
+          child,
-          child: Padding(
+          Center(
-            padding: EdgeInsets.symmetric(horizontal: $styles.insets.sm),
+            child: SizedBox(
-            child: CircleIconBtn(
+              width: maxWidth ?? double.infinity,
-              icon: AppIcons.prev,
+              child: Padding(
-              onPressed: onPressed,
+                padding: EdgeInsets.symmetric(horizontal: $styles.insets.sm),
-              semanticLabel: semanticLabel,
+                child: Row(
-              flipIcon: isNext,
+                  children: [
+                    CircleIconBtn(
+                      icon: AppIcons.prev,
+                      onPressed: onPreviousPressed,
+                      semanticLabel: 'Previous',
+                      bgColor: previousBtnColor,
+                    ),
+                    Spacer(),
+                    CircleIconBtn(
+                      icon: AppIcons.prev,
+                      onPressed: onNextPressed,
+                      semanticLabel: 'Next',
+                      flipIcon: true,
+                      bgColor: nextBtnColor,
+                    )
+                  ],
+                ),
+              ),
             ),
           ),
-        ),
+        ],
-      );
+      ),
-    }
-
-    return Stack(
-      children: [
-        child,
-        //TODO-LOC: Add localization
-        buildBtn('previous', onPreviousPressed, Alignment.centerLeft),
-        buildBtn('next', onNextPressed, Alignment.centerRight, isNext: true),
-      ],
     );
   }
 }

lib/ui/screens/intro/intro_screen.dart

@@ -1,9 +1,11 @@
 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/logic/common/platform_info.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/previous_next_navigation.dart';
 import 'package:wonders/ui/common/static_text_scale.dart';
 import 'package:wonders/ui/common/themed_text.dart';
 import 'package:wonders/ui/common/utils/app_haptics.dart';
@@ -24,13 +26,14 @@ class _IntroScreenState extends State<IntroScreen> {
   static List<_PageData> pageData = [];
 
   late final PageController _pageController = PageController()..addListener(_handlePageChanged);
-  final ValueNotifier<int> _currentPage = ValueNotifier(0);
+  late final ValueNotifier<int> _currentPage = ValueNotifier(0)..addListener(() => setState(() {}));
   bool get _isOnLastPage => _currentPage.value.round() == pageData.length - 1;
   bool get _isOnFirstPage => _currentPage.value.round() == 0;
 
   @override
   void dispose() {
     _pageController.dispose();
+    _currentPage.dispose();
     super.dispose();
   }
 
@@ -53,15 +56,13 @@ class _IntroScreenState extends State<IntroScreen> {
 
   void _handleNavTextSemanticTap() => _incrementPage(1);
 
-  void _incrementPage(int dir){
+  void _incrementPage(int dir) {
     final int current = _pageController.page!.round();
     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
@@ -78,20 +79,25 @@ class _IntroScreenState extends State<IntroScreen> {
     final List<Widget> pages = pageData.map((e) => _Page(data: e)).toList();
 
     /// Return resulting widget tree
-    return Listener(
+    return DefaultTextColor(
-      onPointerSignal: (signal){
+      color: $styles.colors.offWhite,
-        if(signal is PointerScrollEvent){
+      child: ColoredBox(
-          _handleScrollWheel(signal.scrollDelta.dy);
+        color: $styles.colors.black,
-        }
+        child: SafeArea(
-      },
+          child: Animate(
-      child: DefaultTextColor(
+            delay: 500.ms,
-        color: $styles.colors.offWhite,
+            effects: const [FadeEffect()],
-        child: Container(
+            child: PreviousNextNavigation(
-          color: $styles.colors.black,
+              maxWidth: 600,
-          child: SafeArea(
+              nextBtnColor: _isOnLastPage ? $styles.colors.accent1 : null,
-            child: Animate(
+              onPreviousPressed: _isOnFirstPage ? null : () => _incrementPage(-1),
-              delay: 500.ms,
+              onNextPressed: () {
-              effects: const [FadeEffect()],
+                if (_isOnLastPage) {
+                  _handleIntroCompletePressed();
+                } else {
+                  _incrementPage(1);
+                }
+              },
               child: Stack(
                 children: [
                   // page view with title & description:
@@ -159,20 +165,15 @@ class _IntroScreenState extends State<IntroScreen> {
                   _buildHzGradientOverlay(left: true),
                   _buildHzGradientOverlay(),
 
-                  // finish button:
-                  Positioned(
-                    right: $styles.insets.lg,
-                    bottom: $styles.insets.lg,
-                    child: _buildFinishBtn(context),
-                  ),
-
                   // nav help text:
-                  BottomCenter(
+                  if (PlatformInfo.isMobile) ...[
-                    child: Padding(
+                    BottomCenter(
-                      padding: EdgeInsets.only(bottom: $styles.insets.lg),
+                      child: Padding(
-                      child: _buildNavText(context),
+                        padding: EdgeInsets.only(bottom: $styles.insets.lg),
+                        child: _buildNavText(context),
+                      ),
                     ),
-                  ),
+                  ]
                 ],
               ),
             ),
@@ -203,24 +204,6 @@ class _IntroScreenState extends State<IntroScreen> {
     );
   }
 
-  Widget _buildFinishBtn(BuildContext context) {
-    return ValueListenableBuilder<int>(
-      valueListenable: _currentPage,
-      builder: (_, pageIndex, __) {
-        return AnimatedOpacity(
-          opacity: pageIndex == pageData.length - 1 ? 1 : 0,
-          duration: $styles.times.fast,
-          child: CircleIconBtn(
-            icon: AppIcons.next_large,
-            bgColor: $styles.colors.accent1,
-            onPressed: _handleIntroCompletePressed,
-            semanticLabel: $strings.introSemanticEnterApp,
-          ),
-        );
-      },
-    );
-  }
-
   Widget _buildNavText(BuildContext context) {
     return ValueListenableBuilder(
       valueListenable: _currentPage,