code2

import 'package:chicksmore_beta/Pages/Food/product/product.dart';
import 'package:chicksmore_beta/Widget/big_text.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';

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

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

class _foodPageBodyFoodState extends State<foodPageBodyFood> {
  int _selectedIndex = 0;
  String routeArgs = "";
  String foodCatergory = "";

  @override
  void didChangeDependencies() {
    routeArgs = ModalRoute.of(context)!.settings.arguments.toString();
    //_selectedIndex = int.parse(
    //  routeArgs.substring(1, 2),
    //);
    print(routeArgs.toString());
    if (_selectedIndex == 0) {
      setState(() {
        foodCatergory = 'Chop';
      });
    }
    if (_selectedIndex == 1) {
      setState(() {
        foodCatergory = 'Snacks';
      });
    }
    if (_selectedIndex == 2) {
      setState(() {
        foodCatergory = 'Sides';
      });
    }
    if (_selectedIndex == 3) {
      setState(() {
        foodCatergory = 'Noodle';
      });
    }
    if (_selectedIndex == 4) {
      setState(() {
        foodCatergory = 'Rice';
      });
    }
    if (_selectedIndex == 5) {
      setState(() {
        foodCatergory = 'Bucket';
      });
    }
    if (_selectedIndex == 6) {
      setState(() {
        foodCatergory = 'Combo';
      });
    }
    super.didChangeDependencies();
  }

  Widget build(BuildContext context) {
    return Container(
      height: 600,
      child: Row(
        children: [
          LayoutBuilder(
            builder: ((context, constraints) {
              return SingleChildScrollView(
                child: ConstrainedBox(
                  constraints: BoxConstraints(minHeight: constraints.maxHeight),
                  child: IntrinsicHeight(
                    child: NavigationRail(
                      labelType: NavigationRailLabelType.all,
                      selectedIndex: _selectedIndex,
                      onDestinationSelected: (int index) {
                        setState(() {
                          _selectedIndex = index;
                          print(_selectedIndex);
                          if (_selectedIndex == 0) {
                            setState(() {
                              foodCatergory = 'Chop';
                            });
                          }
                          if (_selectedIndex == 1) {
                            setState(() {
                              foodCatergory = 'Snacks';
                            });
                          }
                          if (_selectedIndex == 2) {
                            setState(() {
                              foodCatergory = 'Sides';
                            });
                          }
                          if (_selectedIndex == 3) {
                            setState(() {
                              foodCatergory = 'Noodle';
                            });
                          }
                          if (_selectedIndex == 4) {
                            setState(() {
                              foodCatergory = 'Rice';
                            });
                          }
                          if (_selectedIndex == 5) {
                            setState(() {
                              foodCatergory = 'Bucket';
                            });
                          }
                          if (_selectedIndex == 6) {
                            setState(() {
                              foodCatergory = 'Combo';
                            });
                          }
                          print(foodCatergory);
                        });
                      },
                      destinations: [
                        NavigationRailDestination(
                            icon: const Icon(Icons.food_bank),
                            label: Text("Chop")),
                        NavigationRailDestination(
                            icon: const Icon(Icons.food_bank),
                            label: Text("Snacks")),
                        NavigationRailDestination(
                            icon: const Icon(Icons.food_bank),
                            label: Text("Sides")),
                        NavigationRailDestination(
                            icon: const Icon(Icons.food_bank),
                            label: Text("Noodle")),
                        NavigationRailDestination(
                            icon: const Icon(Icons.food_bank),
                            label: Text("Rice")),
                        NavigationRailDestination(
                            icon: const Icon(Icons.food_bank),
                            label: Text("Bucket")),
                        NavigationRailDestination(
                            icon: const Icon(Icons.food_bank),
                            label: Text("Combo")),
                      ],
                    ),
                  ),
                ),
              );
            }),
          ),
          //ContentSpace(context, foodCatergory),
        ],
      ),
    );
  }
}

class ContentSpace extends StatelessWidget {
  final String category;
  ContentSpace(BuildContext context, this.category);
  final CollectionReference _products =
      FirebaseFirestore.instance.collection('foodProduct');

  @override
  Widget build(BuildContext context) {
    return Container(
      child: StreamBuilder(
          stream: _products.snapshots(),
          builder: (context, AsyncSnapshot<QuerySnapshot> streamSnapshot) {
            if (streamSnapshot.hasData) {
              return ListView.builder(
                  itemCount: streamSnapshot.data!.docs.length,
                  itemBuilder: (context, index) {
                    final DocumentSnapshot documentSnapshot =
                        streamSnapshot.data!.docs[index];
                    return Container(
                      margin: const EdgeInsets.all(10),
                      child: ListTile(
                        title: Text(documentSnapshot['name']),
                        subtitle: Text(documentSnapshot['price'].toString()),
                        trailing: SizedBox(
                          width: 100,
                        ),
                      ),
                    );
                  });
            }
            return SizedBox.shrink();
          }),
    );
  }
}