Flutter-Ernaehrungsapp/lib/android/pages/nav_pages/main_page.dart

import 'package:ernaehrung/android/components/meal_page_text/days_component.dart';
import 'package:ernaehrung/android/config/statistics.dart';
import 'package:ernaehrung/android/pages/nav_pages/progress_page.dart';
import 'package:ernaehrung/android/pages/nav_pages/today_page.dart';
import 'package:flutter/material.dart';
import 'meal_plan_page.dart';

class MainPage extends StatefulWidget {
  const MainPage({Key? key}) : super(key: key);

  @override
  MainPageState createState() => MainPageState();
}

class MainPageState extends State<MainPage> {
  List pages = [
    const TodayPage(title: 'Today'),
    const MealPlanPage(title: 'Meal Plan'),
    const ProgressPage(title: 'Progress')
  ];

  int currentIndex = 0;

  void onTap(int index) {
    setState(() {
      currentIndex = index;
      if(currentIndex == 1){
        StatisticsService.instance.updateStatisticsTodayBoxByTimespan(TimeSpan.day);
      }else if(currentIndex == 2){
        StatisticsService.instance.updateProgressBoxValues();
      }
      pages[currentIndex];
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      extendBodyBehindAppBar: false,
      appBar: AppBar(
        title: Text(
            pages[currentIndex].title,
          style: const TextStyle(
            color: Colors.black
          ),
        ),
        backgroundColor: Colors.transparent,
        foregroundColor: Colors.grey.shade400,
        elevation: 0,
      ),
      body: Padding(
        padding: const EdgeInsets.symmetric(vertical: 0, horizontal: 8),
        child: pages[currentIndex],
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: currentIndex,
        selectedItemColor: Colors.black54,
        unselectedItemColor: Colors.grey.withOpacity(0.5),
        showSelectedLabels: false,
        showUnselectedLabels: false,
        elevation: 0,
        onTap: onTap,
        items: const [
          BottomNavigationBarItem(icon: Icon(Icons.today), label: 'Today'),
          BottomNavigationBarItem(
              icon: Icon(Icons.area_chart), label: 'Progress'),
          BottomNavigationBarItem(icon: Icon(Icons.apple), label: 'Meal Plan'),
        ],
      ),
    );
  }
}