diameter/lib/screens/meal/meal_source_list.dart

import 'package:diameter/components/dialogs.dart';
import 'package:diameter/config.dart';
import 'package:diameter/models/meal_source.dart';
import 'package:diameter/navigation.dart';
import 'package:diameter/screens/meal/meal_source_detail.dart';
import 'package:flutter/material.dart';

class MealSourceListScreen extends StatefulWidget {
  static const String routeName = '/meal-sources';

  const MealSourceListScreen({Key? key}) : super(key: key);

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

class _MealSourceListScreenState extends State<MealSourceListScreen> {
  List<MealSource> _mealSources = [];

  @override
  void initState() {
    super.initState();
    reload();
  }

  void reload({String? message}) {
    setState(() {
      _mealSources = MealSource.getAll();
    });
    setState(() {
      if (message != null) {
        var snackBar = SnackBar(
          content: Text(message),
          duration: const Duration(seconds: 2),
        );
        ScaffoldMessenger.of(context)
          ..removeCurrentSnackBar()
          ..showSnackBar(snackBar);
      }
    });
  }

  void onDelete(MealSource mealSource) {
    MealSource.remove(mealSource.id);
    reload(message: 'Meal Source deleted');
  }

  void handleDeleteAction(MealSource mealSource) async {
    if (showConfirmationDialogOnDelete) {
      Dialogs.showConfirmationDialog(
        context: context,
        onConfirm: () => onDelete(mealSource),
        message: 'Are you sure you want to delete this Meal Source?',
      );
    } else {
      onDelete(mealSource);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Meal Sources'),
        actions: <Widget>[
          IconButton(onPressed: reload, icon: const Icon(Icons.refresh))
        ],
      ),
      drawer: const Navigation(currentLocation: MealSourceListScreen.routeName),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          Expanded(
            child: _mealSources.isNotEmpty ? ListView.builder(
              padding: const EdgeInsets.only(top: 10.0),
              itemCount: _mealSources.length,
              itemBuilder: (context, index) {
                final mealSource = _mealSources[index];

                return ListTile(
                  onTap: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(
                        builder: (context) => MealSourceDetailScreen(
                          id: mealSource.id,
                        ),
                      ),
                    ).then((message) => reload(message: message));
                  },
                  title: Text(mealSource.value),
                  subtitle: Text(mealSource.notes ?? ''),
                  trailing: Row(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      IconButton(
                        icon: const Icon(
                          Icons.delete,
                          color: Colors.blue,
                        ),
                        onPressed: () async {
                          handleDeleteAction(mealSource);
                        },
                      ),
                    ],
                  ),
                );
              }
            ) : const Center(
              child: Text('You have not created any Meal Sources yet!'),
            ),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => const MealSourceDetailScreen(),
            ),
          ).then((message) => reload(message: message));
        },
        child: const Icon(Icons.add),
      ),
    );
  }
}