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Merge pull request 'Handle errors when scanning a barcode and show a snackbar in case' (#2) from error-handling into master

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Reviewed-on: #2
This commit is contained in:
marco 2024-09-08 13:11:28 +00:00
commit a057115b83
6 changed files with 196 additions and 96 deletions
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2
lib/food_entry/enter_food_widget.dart
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@ -1,4 +1,4 @@
import 'package:calorimeter/perdate/perdate_widget.dart';
import 'package:calorimeter/utils/enter_food_controller.dart';
import 'package:calorimeter/storage/storage.dart';
import 'package:flutter/material.dart';
import 'package:calorimeter/food_entry/food_entry_bloc.dart';

47
lib/food_scan/food_fact_lookup.dart
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@ -1,22 +1,44 @@
import 'dart:convert';
import 'dart:developer';
import 'dart:io';
class FoodFactLookupClient {
FoodFactLookupClient();
static const String host = "world.openfoodfacts.org";
static const String url = "https://world.openfoodfacts.org/api/v3/product/";
String getProductUrl(String ean) {
return "$url$ean.json";
}
Future<FoodFactModel> retrieveFoodInfo(String ean) async {
Future<FoodFactResponse> retrieveFoodInfo(String ean) async {
HttpClient client = HttpClient();
var request = await client.getUrl(Uri.parse(getProductUrl(ean)));
var response = await request.close();
var asString = await response.transform(utf8.decoder).join();
return FoodFactModel.fromJson(jsonDecode(asString));
String asString = "";
try {
var request = await client.getUrl(Uri.parse(getProductUrl(ean)));
var response = await request.close();
if (response.statusCode != HttpStatus.ok) {
return FoodFactResponse(
food: null, status: FoodFactResponseStatus.barcodeNotFound);
}
asString = await response.transform(utf8.decoder).join();
} on SocketException {
return FoodFactResponse(
food: null,
status: FoodFactResponseStatus.foodFactServerNotReachable);
} catch (e) {
log(e.toString());
} finally {
client.close();
}
return FoodFactResponse(
food: FoodFactModel.fromJson(jsonDecode(asString)),
status: FoodFactResponseStatus.ok);
}
}
@ -32,3 +54,16 @@ class FoodFactModel {
kcalPer100g: json['product']['nutriments']['energy-kcal_100g']);
}
}
enum FoodFactResponseStatus {
foodFactServerNotReachable,
barcodeNotFound,
ok,
}
class FoodFactResponse {
final FoodFactModel? food;
final FoodFactResponseStatus status;
FoodFactResponse({required this.food, required this.status});
}

163
lib/perdate/perdate_widget.dart
View File

@ -1,5 +1,6 @@
import 'dart:developer';
import 'package:barcode_scan2/barcode_scan2.dart';
import 'package:calorimeter/food_scan/food_fact_lookup.dart';
import 'package:calorimeter/utils/enter_food_controller.dart';
import 'package:calorimeter/utils/scan_food_floating_button.dart';
import 'package:calorimeter/utils/app_drawer.dart';
import 'package:calorimeter/food_entry/food_entry_bloc.dart';
@ -29,7 +30,6 @@ class _PerDateWidgetState extends State<PerDateWidget> {
@override
void initState() {
log("PerDateWidgetState's initState()");
storage = FoodStorage.getInstance();
entriesFuture = storage.getEntriesForDate(widget.date);
entriesFuture.then((val) {
@ -40,67 +40,118 @@ class _PerDateWidgetState extends State<PerDateWidget> {
@override
Widget build(BuildContext context) {
log("PerDateWidgetState's build()");
return FutureBuilder(
future: entriesFuture,
builder: (context, snapshot) {
if (snapshot.connectionState != ConnectionState.done) {
return const Center(child: CircularProgressIndicator());
} else {
return ChangeNotifierProvider(
create: (context) => EnterFoodController(),
child: BlocProvider(
create: (context) => FoodEntryBloc(
initialState: FoodEntryState(foodEntries: entries),
storage: storage,
forDate: widget.date),
child: BlocBuilder<FoodEntryBloc, FoodEntryState>(
builder: (context, state) {
return Scaffold(
appBar: AppBar(
title:
Text(DateFormat.yMMMMd('de').format(widget.date)),
actions: const [ThemeSwitcherButton()],
return snapshot.connectionState != ConnectionState.done
? const Center(child: CircularProgressIndicator())
: MultiProvider(
providers: [
ChangeNotifierProvider(
create: (context) => EnterFoodController()),
BlocProvider(
create: (context) => FoodEntryBloc(
initialState: FoodEntryState(foodEntries: entries),
storage: storage,
forDate: widget.date,
),
body: FoodEntryList(entries: state.foodEntries),
bottomNavigationBar: BottomAppBar(
shape: const RectangularNotchShape(),
color: Theme.of(context).colorScheme.secondary,
child: SumWidget(foodEntries: state.foodEntries)),
drawer: const AppDrawer(),
floatingActionButton: OverflowBar(children: [
const ScanFoodFloatingButton(),
const SizedBox(width: 8),
CalendarFloatingButton(
startFromDate: widget.date,
onDateSelected: (dateSelected) {
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) {
return PerDateWidget(date: dateSelected);
},
),
);
},
)
],
child: BlocBuilder<FoodEntryBloc, FoodEntryState>(
builder: (context, state) {
return Scaffold(
appBar: AppBar(
title:
Text(DateFormat.yMMMMd('de').format(widget.date)),
actions: const [ThemeSwitcherButton()],
),
]),
floatingActionButtonLocation:
FloatingActionButtonLocation.endDocked);
}),
),
);
}
body: FoodEntryList(entries: state.foodEntries),
bottomNavigationBar: BottomAppBar(
shape: const RectangularNotchShape(),
color: Theme.of(context).colorScheme.secondary,
child: SumWidget(foodEntries: state.foodEntries)),
drawer: const AppDrawer(),
floatingActionButton: OverflowBar(children: [
ScanFoodFloatingButton(
onPressed: () async {
var client = FoodFactLookupClient();
var scanResult = await BarcodeScanner.scan();
if (scanResult.type == ResultType.Cancelled) {
return;
}
if (!context.mounted) return;
if (scanResult.type == ResultType.Error) {
showNewSnackbarWith(context,
"Fehler beim Scannen des Barcodes.");
}
var response = await client
.retrieveFoodInfo(scanResult.rawContent);
if (!context.mounted) return;
if (response.status ==
FoodFactResponseStatus.barcodeNotFound) {
showNewSnackbarWith(context,
"Barcode konnte nicht gefunden werden.");
return;
}
if (response.status ==
FoodFactResponseStatus
.foodFactServerNotReachable) {
showNewSnackbarWith(context,
"OpenFoodFacts-Server konnte nicht erreicht werden.");
return;
}
context.read<EnterFoodController>().set(
response.food!.name,
response.food!.kcalPer100g.toString(),
);
},
),
const SizedBox(width: 8),
CalendarFloatingButton(
startFromDate: widget.date,
onDateSelected: (dateSelected) {
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) {
return PerDateWidget(date: dateSelected);
},
),
);
},
),
]),
floatingActionButtonLocation:
FloatingActionButtonLocation.endDocked);
}),
);
});
}
}
class EnterFoodController extends ChangeNotifier {
String name = "";
String kcalPer100g = "";
void showNewSnackbarWith(BuildContext context, String text) {
var snackbar =
ErrorSnackbar(colorScheme: Theme.of(context).colorScheme, text: text);
void set(String newName, String newKcal) {
name = newName;
kcalPer100g = newKcal;
notifyListeners();
ScaffoldMessenger.of(context).clearSnackBars();
ScaffoldMessenger.of(context).showSnackBar(snackbar);
}
}
class ErrorSnackbar extends SnackBar {
final String text;
final ColorScheme colorScheme;
ErrorSnackbar({
required this.text,
required this.colorScheme,
super.key,
}) : super(
content: Text(text, style: TextStyle(color: colorScheme.onError)),
backgroundColor: colorScheme.error);
}

12
lib/utils/enter_food_controller.dart Normal file
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@ -0,0 +1,12 @@
import 'package:flutter/material.dart';
class EnterFoodController extends ChangeNotifier {
String name = "";
String kcalPer100g = "";
void set(String newName, String newKcal) {
name = newName;
kcalPer100g = newKcal;
notifyListeners();
}
}

22
lib/utils/scan_food_floating_button.dart
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@ -1,30 +1,16 @@
import 'package:barcode_scan2/barcode_scan2.dart';
import 'package:calorimeter/food_scan/food_fact_lookup.dart';
import 'package:calorimeter/perdate/perdate_widget.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
class ScanFoodFloatingButton extends StatelessWidget {
const ScanFoodFloatingButton({
super.key,
});
final Function() onPressed;
const ScanFoodFloatingButton({super.key, required this.onPressed});
@override
Widget build(BuildContext context) {
return FloatingActionButton(
heroTag: "scanFoodFAB",
child: const Icon(Icons.barcode_reader),
onPressed: () async {
var client = FoodFactLookupClient();
var scanResult = await BarcodeScanner.scan();
var food = await client.retrieveFoodInfo(scanResult.rawContent);
if (!context.mounted) return;
context
.read<EnterFoodController>()
.set(food.name, food.kcalPer100g.toString());
onPressed: () {
onPressed();
},
);
}

46
lib/utils/sum_widget.dart
View File

@ -2,37 +2,53 @@ import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:calorimeter/food_entry/food_entry_bloc.dart';
import 'package:calorimeter/utils/settings_bloc.dart';
import 'package:calorimeter/utils/row_with_spacers_widget.dart';
class SumWidget extends StatefulWidget {
class SumWidget extends StatelessWidget {
final List<FoodEntry> foodEntries;
const SumWidget({required this.foodEntries, super.key});
@override
State<SumWidget> createState() => _SumWidgetState();
}
class _SumWidgetState extends State<SumWidget> {
@override
Widget build(BuildContext context) {
return BlocBuilder<SettingsDataBloc, SettingsState>(
builder: (context, state) {
var sum = 0.0;
for (var entry in widget.foodEntries) {
for (var entry in foodEntries) {
sum += entry.kcalPerMass / 100 * entry.mass;
}
var diff = state.kcalLimit - sum;
var diffLimit = state.kcalLimit ~/ 4;
return RowWidget(
Text(
var textColor = Theme.of(context).colorScheme.onSecondary;
var newTextColor = textColor;
var brightness = Theme.of(context).brightness;
switch (brightness) {
case Brightness.dark:
if (diff < 0) {
newTextColor = Colors.red[900]!;
} else if (diff < diffLimit) {
newTextColor = Colors.orange[900]!;
}
break;
case Brightness.light:
if (diff < 0) {
newTextColor = Colors.redAccent;
} else if (diff < diffLimit) {
newTextColor = Colors.orangeAccent;
}
break;
}
return Align(
alignment: Alignment.centerLeft,
child: Text(
'kcal heute: ${sum.ceil().toString()}/${state.kcalLimit.ceil()}',
style: Theme.of(context)
.textTheme
.bodyMedium!
.copyWith(color: Theme.of(context).colorScheme.onPrimary),
.bodyLarge!
.copyWith(color: newTextColor),
),
null,
null,
null,
);
},
);