food_screen.dart

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import 'package:connect/core/ui/widgets/custom_scaffold.dart';
import 'package:connect/features/co2_emmissions/screens/food/views/adjust_menu_based.dart';
import 'package:connect/features/co2_emmissions/screens/food/views/average_portion_size.dart';
import 'package:connect/features/co2_emmissions/screens/food/views/local_ingredients_percentage_view.dart';
import 'package:connect/features/co2_emmissions/screens/food/views/susutanable_sourcing.dart';
import 'package:connect/features/co2_emmissions/screens/food/views/total_ingredient_weight.dart';
import 'package:connect/features/co2_emmissions/screens/operational_details_screen/views/operational_hours_view.dart';
import 'package:connect/features/co2_emmissions/screens/operational_details_screen/views/opetrational_days_view.dart';
import 'package:connect/features/co2_emmissions/screens/widgets/page_navigator.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
 
class FoodScreen extends StatefulWidget {
  const FoodScreen({super.key});
 
  @override
  State<FoodScreen> createState() => _FoodScreenState();
}
 
class _FoodScreenState extends State<FoodScreen> {
  final PageController _pageController = PageController(keepPage: true);
  late final List<Widget> _pages;
  int _currentPageIndex = 0;
 
  @override
  void initState() {
    super.initState();
    _pages = [
      const KeepAlivePage(child: TotalIngredientWeight()),
      const KeepAlivePage(child: AveragePortionSize()),
      const KeepAlivePage(child: LocalIngredientsPercentageView()),
      const KeepAlivePage(child: AdjustMenuBased()),
      const KeepAlivePage(child: SustanableSourcing()),
    ];
 
    _pageController.addListener(_updatePageIndex);
  }
 
  void _updatePageIndex() {
    final newIndex = _pageController.page?.round() ?? 0;
    if (newIndex != _currentPageIndex) {
      setState(() => _currentPageIndex = newIndex);
    }
  }
 
  @override
  void dispose() {
    _pageController.removeListener(_updatePageIndex);
    _pageController.dispose();
    super.dispose();
  }
 
  @override
  Widget build(BuildContext context) {
    return CustomScaffold(
      floating: PageNavigator(
        tottalPages: 5,
        currentPage: _currentPageIndex,
        pageController: _pageController,
      ),
      isLeadingVisible: true,
      title: 'Operational Details',
      body: SafeArea(
        child: Padding(
          padding: EdgeInsets.only(bottom: 100.sp),
          child: PageView(
            physics: const NeverScrollableScrollPhysics(),
            controller: _pageController,
            children: _pages,
          ),
        ),
      ),
    );
  }
}
 
class KeepAlivePage extends StatefulWidget {
  final Widget child;
 
  const KeepAlivePage({
    super.key,
    required this.child,
  });
 
  @override
  State<KeepAlivePage> createState() => _KeepAlivePageState();
}
 
class _KeepAlivePageState extends State<KeepAlivePage>
    with AutomaticKeepAliveClientMixin {
  @override
  Widget build(BuildContext context) {
    super.build(context);
    return widget.child;
  }
 
  @override
  bool get wantKeepAlive => true;
}