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I want to add search functionality from Api. It is a backend search, so I get data continuous when clicked on on-changed function. I use future provider to get data. Please tell how can I achieve that.
Here Is my design what I want to do. Ui Image Demo
Also Here Is my code demo
`
class SearchPage extends StatelessWidget {
const SearchPage({super.key});
#override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
ChangeNotifierProvider(create: (context) => SearchProvider()),
],
child: Consumer<SearchProvider>(
builder: (context, value, child) => Scaffold(
appBar: BuildSearchAppBar(),
body: Body()
),
),
);
}
}
class BuildSearchAppBar extends StatelessWidget with PreferredSizeWidget {
BuildSearchAppBar({super.key});
#override
Size get preferredSize => const Size.fromHeight(kToolbarHeight);
#override
Widget build(BuildContext context) {
SearchProvider provider = Provider.of<SearchProvider>(context);
return AppBar(
title: TextField(
controller: provider.textEditingController,
decoration: InputDecoration(
alignLabelWithHint: true,
floatingLabelBehavior: FloatingLabelBehavior.never,
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(6.r),
),
constraints: BoxConstraints.tight(Size(1.sw, 40.h)),
labelText: "Search",
prefixIcon: Icon(
Icons.search,
size: 20.r,
),
labelStyle: TextStyle(fontSize: 15.sp, fontStyle: FontStyle.italic),
),
onChanged: (value) {
provider.showProductSuggetion();
},
),
actions: [
IconButton(
onPressed: () {
provider.textEditingController.clear();
},
icon: const Icon(Icons.clear),
),
],
);
}
}
class SearchProvider with ChangeNotifier {
bool isClicked = false;
final TextEditingController textEditingController = TextEditingController();
void showProductSuggetion() {
isClicked = true;
FutureProvider(
create: (_) => searchSuggestionService(textEditingController.text),
initialData: SearchSuggetionModel());
notifyListeners();
}
Future<SearchSuggetionModel> searchSuggestionService(String keyword) async {
Map<String, Map<String, Object>> singleProductVariable = {
"productPrams": {"search": keyword, "visibility": true, "approved": true}
};
QueryResult queryResult = await qlclient.query(
QueryOptions(
document: gql(QueryDocument.searchSuggestion),
variables: singleProductVariable),
);
var data = queryResult.data as Map<String, dynamic>;
print(data);
var body = SearchSuggetionModel.fromJson(data);
notifyListeners();
return body;
}
}
I want to implement backend search with continues data fetching using provider.
I created a login form in where i am passing the username to dashboard screen using shared perference, problem is when i logged in from abc name and pass it to dashboard it is displaying correct name, but when i logged in from xyz name it display the abc name on dashboard, it is not reseting the variable value, i run the app again, hot reload each and everything but noting happend.
here is the code of login screen
String getname="";
Future login() async {
Dio dio = new Dio();
var myPrefs = await SharedPreferences.getInstance();
data = {
'username':"abc",
'password': "abc123",
'date': formattedDate
};
await dio.post(localhostUrlLogin,data: json.encode(data),)
.then((onResponse) async {
getname = (onResponse.data['User']['username']);
}).catchError((onerror) {});
await myPrefs.setString('name', getname);
Navigator.push(
context, new MaterialPageRoute(builder: (context) =>dashboard()));
}
dashboard screen code
class dashboard extends StatefulWidget {
#override
_dashboard State createState() => _dashboard State();
}
class _dashboard State extends State<dashboard > {
String getname = "";
_userDetails() async {
SharedPreferences myPrefs = await SharedPreferences.getInstance();
setState(() {
getname = myPrefs.getString('name');
}
void initState() {
super.initState();
_userDetails();
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.grey[200],
appBar: new MyAppBar(title: Text("Home")),
drawer: NavigationDrawerWidget(),
body: SingleChildScrollView(
child: Column(children: [
SizedBox(height: 10),
Center(
child: Text(
"Hello, " + getname,
style: TextStyle(fontSize: 35, fontWeight: FontWeight.bold),
),
),
}
please help how to fix it.
I have a list of cards and each card has a long press function which when clicked, pops up an alert dialog. I would like the card to change color based on the option chosen in the alert dialog. My alert dialog has 3 options:
Completed (Card should change to color green),
In Progress ( Color orange),
Cancel (Color grey).
At first, when the screen loads, it should show list of cards each painted the color based on the value saved in the database. Then, when the user long presses a card and chooses an option from the alert dialog, the card's color should change based on the chosen option. Only that particular card's color should change.
I have read somewhere that this might be achievable using valuechangenotifier. So here's what I did so far:
First I created my changenotifier class like below:
import 'package:flutter/material.dart';
class ColorChanger with ChangeNotifier{
Color _color = Colors.white;
ColorChanger(this._color);
getColor() => _color;
setTheme (Color color) {
_color = color;
notifyListeners();
}
}
Then I used it in my dart class. However, the color does not seem to change. What am I missing here?
class OrderItem extends StatefulWidget {
final ord.OrderItem order;
OrderItem(this.order);
#override
_OrderItemState createState() => _OrderItemState();
}
class _OrderItemState extends State<OrderItem> {
var _expanded = false;
var mycolor = Colors.white;
#override
Widget build(BuildContext context) {
ColorChanger _color = Provider.of<ColorChanger>(context);
var listProducts = widget.order.products;
return Card(
color: widget.order.orderStatus=='completed'
?Colors.lightGreen:widget.order.orderStatus=='inprogress'?
Colors.orangeAccent:
widget.order.orderStatus=='cancelled'?Colors.grey:mycolor,
margin: EdgeInsets.all(10),
child: Column(
children: <Widget>[
ListTile(
title: RichText(
text: new TextSpan(
style: new TextStyle(
fontSize: 14.0,
color: Colors.black,
),
children: <TextSpan>[
new TextSpan(
text: 'Order Number : ',
style: new TextStyle(fontWeight: FontWeight.bold)),
new TextSpan(text: widget.order.uniqueOrderNumber),
],
),
),
trailing: IconButton(
icon: Icon(_expanded ? Icons.expand_less : Icons.expand_more),
onPressed: () {
setState(() {
_expanded = !_expanded;
});
},
),
onLongPress: toggleSelection,
),
],
),
);
}
void toggleSelection() {
ColorChanger _color = Provider.of<ColorChanger>(context,listen:false);
Widget completeOrder = FlatButton(
child: Text('Completed'),
onPressed: () async {
try {
Navigator.of(context).pop(true);
// setState(() {
_color.setTheme(Colors.lightGreen);
// });
await Provider.of<Orders>(context, listen: false)
.updateOrder(widget.order,'completed');
} catch (error) {
}
});
Widget startOrder = FlatButton(
child: Text('In progress'),
onPressed: () async {
try {
Navigator.of(context).pop(true);
// setState(() {
_color.setTheme(Colors.orangeAccent);
//});
//Update Db to mark order in progress
await Provider.of<Orders>(context, listen: false)
.updateOrder(widget.order,'inprogress');
} catch (error) {
}
});
Widget cancelOrder = FlatButton(
child: Text('Cancel'),
onPressed: () async {
try {
Navigator.of(context).pop(false);
// setState(() {
_color.setTheme(Colors.grey);
// });
//Update Db to mark order as cancelled
await Provider.of<Orders>(context, listen: false)
.updateOrder(widget.order,'cancelled');
} catch (error) {
}
});
showDialog(
context: context,
builder: (ctx) => AlertDialog(
title: Text('Take Action'),
content: Text('What do you want to do with the order?'),
actions: <Widget>[
startOrder,
completeOrder,
cancelOrder
],
),
);
});
}
}
SECOND TRY based on Loren's answer.
import 'package:flutter/material.dart';
class ColorChanger with ChangeNotifier{
Color color = Colors.white;
setTheme (Color newColor) {
color = newColor;
notifyListeners();
}
}
class OrderItem extends StatefulWidget {
final ord.OrderItem order;
OrderItem(this.order);
#override
_OrderItemState createState() => _OrderItemState();
}
class _OrderItemState extends State<OrderItem> {
var _expanded = false;
//Set the color based on what was last saved in the DB
void didChangeDependencies() async {
var colorChanger = Provider.of<ColorChanger>(context, listen: false);
if(widget.order.orderStatus=='completed')
colorChanger.setTheme(Colors.lightGreen);
else if(widget.order.orderStatus=='inprogress')
colorChanger.setTheme(Colors.orangeAccent);
else if(widget.order.orderStatus=='cancelled')
colorChanger.setTheme(Colors.grey);
super.didChangeDependencies();
}
#override
Widget build(BuildContext context) {
var listProducts = widget.order.products;
return Consumer<ColorChanger>(
builder: (context, colorChanger, child) {
return Card(
color: widget.order.orderStatus=='completed'
?Colors.lightGreen:widget.order.orderStatus=='inprogress'?
Colors.orangeAccent:
widget.order.orderStatus=='cancelled'?Colors.grey:mycolor,
margin: EdgeInsets.all(10),
child: Column(
children: <Widget>[
ListTile(
title: RichText(
text: new TextSpan(
style: new TextStyle(
fontSize: 14.0,
color: Colors.black,
),
children: <TextSpan>[
new TextSpan(
text: 'Order Number : ',
style: new TextStyle(fontWeight: FontWeight.bold)),
new TextSpan(text: widget.order.uniqueOrderNumber),
],
),
),
trailing: IconButton(
icon: Icon(_expanded ? Icons.expand_less : Icons.expand_more),
onPressed: () {
setState(() {
_expanded = !_expanded;
});
},
),
onLongPress: toggleSelection,
),
],
),
)};
}
void toggleSelection() {
ColorChanger _color = Provider.of<ColorChanger>(context,listen:false);
Widget completeOrder = FlatButton(
child: Text('Completed'),
onPressed: () async {
try {
Navigator.of(context).pop(true);
// setState(() {
_color.setTheme(Colors.lightGreen);
// });
await Provider.of<Orders>(context, listen: false)
.updateOrder(widget.order,'completed');
} catch (error) {
}
});
Widget startOrder = FlatButton(
child: Text('In progress'),
onPressed: () async {
try {
Navigator.of(context).pop(true);
// setState(() {
_color.setTheme(Colors.orangeAccent);
//});
//Update Db to mark order in progress
await Provider.of<Orders>(context, listen: false)
.updateOrder(widget.order,'inprogress');
} catch (error) {
}
});
Widget cancelOrder = FlatButton(
child: Text('Cancel'),
onPressed: () async {
try {
Navigator.of(context).pop(false);
// setState(() {
_color.setTheme(Colors.grey);
// });
//Update Db to mark order as cancelled
await Provider.of<Orders>(context, listen: false)
.updateOrder(widget.order,'cancelled');
} catch (error) {
}
});
showDialog(
context: context,
builder: (ctx) => AlertDialog(
title: Text('Take Action'),
content: Text('What do you want to do with the order?'),
actions: <Widget>[
startOrder,
completeOrder,
cancelOrder
],
),
);
});
}
}
When I do it this way, it changes the color of all the cards instead of just that one card. What am I doing wrong here?
Sharing order.dart
class OrderItem {
final String id;
final double amount;
final int deliveryFee;
final List<CartItem> products;
final DateTime dateTime;
final String deliveryMethod;
final String uniqueOrderNumber;
final String orderStatus;
final String userId;
final String customMessage;
final String customerName;
final String phoneNumber;
OrderItem(
{#required this.id,
#required this.amount,
#required this.products,
#required this.dateTime,
#required this.deliveryMethod,
#required this.uniqueOrderNumber,
#required this.isOrderComplete,
this.orderStatus,
#required this.customMessage,
#required this.deliveryFee,
this.customerName,
this.phoneNumber,
#required this.userId});
}
class Orders with ChangeNotifier {
final String authToken;
final String userId;
Orders(this.authToken, this.userId);
List<OrderItem> _orders = [];
List<OrderItem> get orders {
return [..._orders];
}
Future<void> updateOrder(OrderItem order,String orderStatus) async {
final id = order.id;
final customerId = order.userId;
final url =
'https://cv.firebaseio.com/orders/$customerId/$id.json?auth=$authToken';
try {
await http.patch(url,
body: json.encode({
'orderStatus':orderStatus
}));
} catch (error) {
print(error);
}
notifyListeners();
}
UPDATED ANSWER:
So when trying to do this with Provider I kept getting errors that would have required me to keep bugging you for more and more code to try and replicate everything you have going on, and I didn't want to get into that.
So this solution may or may not be acceptable to you because it uses GetX State Management, but it works. In addition it doesn't require wrapping your whole app in provider widgets so dealing with scope etc...is a non issue.
Let's add a statusColor property to your OrderItem model. This is what will get changed.
Color statusColor = Colors.white; // or whatever you you want the default color to be
Your updated Orders class that uses GetX instead of ChangeNotifier (again, not because Provider can't do this, but because I was dealing with too many errors and frankly GetX is easier in my opinion anyway)
class Orders extends GetxController {
final String authToken;
final String userId;
Orders(this.authToken, this.userId);
List<OrderItem> orders = []; // back to what I said earlier about no point in getters and setters here
// temp function just to test this on my end
void addOrder(OrderItem order) {
orders.add(order);
update();
}
// this loops through the list to find the matching order number,
// then updates the color for just that order
void updateOrderStatusColor({OrderItem updatedOrder, String status}) {
for (final order in orders) {
if (order.uniqueOrderNumber == updatedOrder.uniqueOrderNumber) {
switch (status) {
case 'completed':
{
order.statusColor = Colors.greenAccent;
}
break;
case 'inprogress':
{
order.statusColor = Colors.orangeAccent;
}
break;
case 'cancelled':
{
order.statusColor = Colors.grey;
}
break;
}
}
}
update(); // equivelent of notifyListeners();
}
// ...the rest of your class
}
A few small changes to your card. didChangeDependencies can go away entirely.
// it seems like you had 2 classes with the same name, which is not recommended
class OrderItemCard extends StatefulWidget {
final OrderItem order;
OrderItemCard(this.order);
#override
_OrderItemCardState createState() => _OrderItemCardState();
}
class _OrderItemCardState extends State<OrderItemCard> {
var _expanded = false;
final controller = Get.find<Orders>(); // equivilent of Provider.of... finds the same instance without needing context
void toggleSelection() {
Widget completeOrder = TextButton(
child: Text('Completed'),
onPressed: () async {
try {
Navigator.of(context).pop(true);
controller.updateOrderStatusColor(
updatedOrder: widget.order, status: 'completed'); // calling new function here
} catch (error) {}
});
Widget startOrder = FlatButton(
child: Text('In progress'),
onPressed: () async {
try {
Navigator.of(context).pop(true);
controller.updateOrderStatusColor(
updatedOrder: widget.order, status: 'inprogress');
} catch (error) {}
});
Widget cancelOrder = FlatButton(
child: Text('Cancel'),
onPressed: () async {
controller.updateOrderStatusColor(
updatedOrder: widget.order, status: 'cancelled');
try {
Navigator.of(context).pop(false);
} catch (error) {}
});
showDialog(
context: context,
builder: (ctx) => AlertDialog(
title: Text('Take Action'),
content: Text('What do you want to do with the order?'),
actions: <Widget>[startOrder, completeOrder, cancelOrder],
),
);
}
#override
Widget build(BuildContext context) {
return Card(
margin: EdgeInsets.all(10),
color: widget.order.statusColor, // new color property added to your model
child: Column(
children: <Widget>[
ListTile(
title: RichText(
text: new TextSpan(
style: new TextStyle(
fontSize: 14.0,
color: Colors.black,
),
children: <TextSpan>[
new TextSpan(
text: 'Order Number : ${widget.order.uniqueOrderNumber} ',
style: new TextStyle(fontWeight: FontWeight.bold)),
],
),
),
trailing: IconButton(
icon: Icon(_expanded ? Icons.expand_less : Icons.expand_more),
onPressed: () {
setState(() {
_expanded = !_expanded;
});
},
),
onLongPress: toggleSelection,
),
],
),
);
}
}
Not sure what you have going on in your UI but here's a quick demo of how it would work in GetX. It's a simple ListView.builder populated from the orders list from the GetX Class. The GetBuilder<Orders> widget rebuilds when update() is called. Also a simple button that adds a dummy item for demo purposes. I don't know how you're generating your unique order # but I'm just using the list index for this. Both inside a column within a scaffold on a demo page.
// Equivilent of Consumer but doesn't need context nor any provider widget above it
GetBuilder<Orders>(
builder: (controller) => Expanded(
child: ListView.builder(
itemCount: controller.orders.length,
itemBuilder: (context, index) =>
OrderItemCard(controller.orders[index])),
),
),
TextButton(
onPressed: () {
final controller = Get.find<Orders>();
final orderItem = OrderItem(
orderStatus: ' ',
uniqueOrderNumber: controller.orders.length
.toString(), // just a hack to generate a unique order # for demo
);
controller.addOrder(orderItem);
},
child: Text('Add Item'),
)
Last thing is just initializing the GetX Controller. It can be done anywhere as long as its before you try and use it.
void main() {
// initialing the GetX GetxController
// not sure how you're generating the required auth and user id
// but I'm just passing in empty strings for now
Get.put(Orders('', ''));
runApp(MyApp());
}
So if you're open to GetX here, you can leave Provider for any other ChangeNotifier classes you may have in place if you want. For this you would just need to replace any Consumer<Orders> with GetBuilder<Order> and then get rid of the Provider<Orders>(create:... widget entirely.
OLD ANSWER:
You're missing a couple things in order to be using Provider properly and get the color changing the way you want.
For starters, your Card needs to be wrapped in a Consumer widget that gets notified of changes and rebuilds its children. Inside the Consumer, you need to be using the color property of the ChangeNotifier class. It doesn't need to know or care about the orderStatus because you're already explicitly telling it to change color when you call the setTheme method.
Consumer<ColorChanger>( // this is what rebuilds and changes the color
builder: (context, colorChanger, child) {
return Card(
color: colorChanger.color, // colorChanger here is equivalent of declaring final colorChanger = Provider.of<ColorChanger>(context...
child: Column(
children: <Widget>[
ListTile(
title: RichText(
text: new TextSpan(
style: new TextStyle(
fontSize: 14.0,
color: Colors.black,
),
children: <TextSpan>[
new TextSpan(
text: 'Order Number : ',
style: new TextStyle(fontWeight: FontWeight.bold)),
new TextSpan(text: widget.order.uniqueOrderNumber),
],
),
),
trailing: IconButton(
icon: Icon(_expanded ? Icons.expand_less : Icons.expand_more),
onPressed: () {
setState(() {
_expanded = !_expanded;
});
},
),
onLongPress: toggleSelection,
),
],
),
);
});
Next, see this link as to why you're not gaining anything with using the private _color and public getColor in your ChangeNotifier class.
So lets simplify that a bit.
class ColorChanger with ChangeNotifier {
Color color = Colors.white;
ColorChanger(this.color);
setTheme(Color newColor) {
color = newColor;
notifyListeners();
}
}
Now, whenever you call the setTheme function from your dialog, that card will change to whatever color you pass into it because the Consumer widget is notified, and will rebuild with the updated color value of the ChangeNotifier class.
Something like this would be the simplest way to the thing you want to achieve:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
// define a list of colors:
final colors = <Color>[
Colors.white, // this is the inital color
Colors.green,
Colors.orange,
Colors.grey
];
int index = 0;
Future<int> showMyDialog(BuildContext context) async {
// Since all Navigator.push(...) and showDialog(...) calls are futures
// we can send values alongside them when we pop the context:
// final value = await Navigator.push(...);
// or
// final value = await showDialog(...);
// then we do a:
// Navigator.pop(context, SOME_VALUE,);
// the value variable will be assigned to the one we sent
return await showDialog(
context: context,
builder: (context) => AlertDialog(
title: Text('Take Action'),
content: Text('What do you want to do with the order?'),
actions: <Widget>[
TextButton(
child: Text('Completed',
style: TextStyle(
color: Colors.green,
)),
onPressed: () => Navigator.pop(context, 1)),
TextButton(
child: Text('In progress',
style: TextStyle(
color: Colors.orange,
)),
onPressed: () => Navigator.pop(context, 2)),
TextButton(
child: Text('Cancel',
style: TextStyle(
color: Colors.grey,
)),
onPressed: () => Navigator.pop(context, 3)),
],
),
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(children: <Widget>[
Card(
color: colors[index],
child: Container(width: 50, height: 50),
),
ElevatedButton(
child: Text('Show dialog'),
onPressed: () async {
// call the showMyDialog function, it returns
// a future int so we have to await it
final int _index = await showMyDialog(context);
// if the returned value (_index) is null we use
// the old one value to avoid erros in the code
setState(() => index = _index ?? index);
}),
]),
);
}
}
A very simple workaround would be to declare a global color variable cardColor and assign it to the color property of the card. Then on the alertdialog, change the 'onChange'or 'onTap' property of the widget so that on tapping, the widget changes the value of the global variable cardColor to a different color. Don't forget to do the final step i.e. changing the value of the variable, inside setState()
The best way to achieve it by using AwesomeDialog
https://pub.dev/packages/awesome_dialog
AwesomeDialog(
context: context,
dialogType: DialogType.INFO,
animType: AnimType.BOTTOMSLIDE,
title: 'Dialog Title',
desc: 'Dialog description here.............',
btnCancelOnPress: () {},
btnOkOnPress: () {},
)..show();
Okay, good day everyone, here comes a question:
I've started using flutter for mobile front, it's quite nice.
But I cannot understand an idea of handling a jwt token and redirecting if it is exists.
Consider small app, let me simplify:
final storage = FlutterSecureStorage(); # init storage here?
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData.dark(),
home: LoginPage(), # want home page actually, smth like if storage is empty, then call loginpage, if storage is not empty - try to make http request, if request is okay and data received - show homepage, if request is rejected - login to obtain new jwt
);
}
}
http request:
Future<User> userLogin(String login, String password) async {
Response response = await post('$_apiUrl' + '/' + '$_loginUrl',
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(<String, String>{
'login': login,
'password': password,
}));
if (response.statusCode == 200) {
return User.fromJson(json.decode(response.body));
} else {
throw HttpException(
'Error making login request. Status code: ${response.statusCode}');
}
}
User class:
class User {
final String token;
final String uuid;
final String login;
final String email;
final String firstName;
final String lastName;
User({this.token, this.uuid, this.login, this.email, this.firstName, this.lastName});
factory User.fromJson(Map<String, dynamic> json) {
return User(
token: json['token'],
uuid: json['user']['uuid'],
login: json['user']['login'],
email: json['user']['email'],
firstName: json['user']['firstName'],
lastName: json['user']['lastName'],
);
}
}
So how this works now:
In main file as for now I call login page, with a button:
FlatButton(
child: Text(
'Sign in',
style: TextStyle(
color: Colors.black,
),
),
color: Colors.white,
onPressed: () {
Future<User> user = ApiRequestController().userLogin('alex', 'alex123');
Navigator.push(context, MaterialPageRoute(builder: (context) {
return UserProfile(userData: user,);
}));
},
),
Then I get redirected to user profile, nothing interesting:
class UserProfile extends StatefulWidget {
UserProfile({this.userData});
final userData;
#override
_UserProfileState createState() => _UserProfileState();
}
class _UserProfileState extends State<UserProfile> {
#override
void initState() {
// TODO: implement initState
super.initState();
futureUser = widget.userData;
print(futureUser);
}
Future<User> futureUser;
#override
Widget build(BuildContext context) {
common stuff like scaffold etc
And then I build a profile:
FutureBuilder<User>(
future: futureUser,
builder: (context, snapshot) {
if (snapshot.hasData) {
dynamic userProfile = snapshot.data;
return Column(
children: [
Container(
child: ListTile(
title: Text(
'login: ' + '${userProfile.login}',
style: TextStyle(
color: Colors.black,
),
),
),
),
Container(
child: ListTile(
title: Text(
'uuid: ' + '${userProfile.uuid}',
style: TextStyle(
color: Colors.black,
),
),
),
),
Container(
child: ListTile(
title: Text(
'First name: ' + '${userProfile.firstName}',
style: TextStyle(
color: Colors.black,
),
),
),
),
Container(
child: ListTile(
title: Text(
'Last name: ' + '${userProfile.lastName}',
style: TextStyle(
color: Colors.black,
),
),
),
),
Container(
child: ListTile(
title: Text(
'Auth token: ' + '${userProfile.token}',
style: TextStyle(
color: Colors.black,
),
),
),
),
],
);
} else if (snapshot.hasError) {
return Text('${snapshot.error}');
}
return CircularProgressIndicator();
},
),
Interface is simplified for easier understanding.
So what I have now, I have main dart file, where I call login screen (not home screen, because I cannot get an idea how to use token), where I call async http request to an api, then I am redirected to the user profile.
Idea is very simple:
App opened -> send http request with existing auth header, if answer is 200, then show homepage
If answer was not 200 (token expired/corrupted/doesn't exist, checked on the server side), then navigate user to login screen to obtain new auth token
How to store damn jwt token correctly -_-? I've tried multiple times with futures, plain requests, I cannot get an idea of parsing token between multiple screens.
What should I do? Where to initialize a token? Where to store it? How can I call it from other widget?
I've read about InheritedWidget, okay. But i.e., my HomePage already extends StatefulWidget, and there is no multiple inheritance. Extend it to User class or what?
So I am stuck with this simple goal, and cannot move any further. Just need to check if token exists -> show home, if not - show login. After we've obtained correct token - we can use whole app, making each request with an auth token received at first login screen.
Where to initialize token? Where should I inherit InheritedWidget? Model? ViewPage? Where?
Architecture failure :(
Help is much appreciated! Thanks in advance
I'm having a problem with the attached widget tests in flutter. When I run the tests individually, each of them succeeds; however, when I run the entire main() method, the first three tests succeed but the last two fail with the following exception:
Expected: exactly one matching node in the widget tree
Actual: ?:<zero widgets with type "SuccessDialog" (ignoring offstage widgets)>
I understand that the exception means that the widget I'm expecting is not present - what I don't understand is why the test succeeds when run individually but fails after being run after other tests. Is there some instance I need to be "resetting" after each test?
I've tried inserting "final SemanticsHandle handle = tester.ensureSemantics();" at the start of each tests and "handle.dispose();" at the end of each test but got the same results.
EDIT:
After some further investigating it seems like the problem may be with how I manage bloc instances using the flutter_bloc package. I have altered my tests to create a new testWidget instance for each test but am still encountering the same problem. Is there anything I may be missing that would cause a bloc instance to persist across testWidget objects?
My new test code looks like this:
main() {
MvnoMockClient.init();
testWidgets(
'Voucher Redemption: Tapping redeem when no values were entered yields 2 field errors',
(WidgetTester tester) async {
Widget testWidget = MediaQuery(
data: MediaQueryData(),
child: MaterialApp(
home: VoucherRedemptionPage(onSuccess: () {}, onFail: () {}),
),
);
await tester.pumpWidget(testWidget);
await tester.tap(find.byType(PrimaryCardButton));
await tester.pump();
expect(find.text("Field is required"), findsNWidgets(2));
});
testWidgets(
'Voucher Redemption: Tapping redeem when only voucher number was entered yields one field error',
(WidgetTester tester) async {
Widget testWidget = MediaQuery(
data: MediaQueryData(),
child: MaterialApp(
home: VoucherRedemptionPage(onSuccess: () {}, onFail: () {}),
),
);
await tester.pumpWidget(testWidget);
await tester.enterText(find.byType(PlainTextField), "0000000000");
await tester.tap(find.byType(PrimaryCardButton));
await tester.pump();
expect(find.text("Field is required"), findsOneWidget);
});
testWidgets(
'Voucher Redemption: Tapping redeem when only mobile number was entered yields one field error',
(WidgetTester tester) async {
Widget testWidget = MediaQuery(
data: MediaQueryData(),
child: MaterialApp(
home: VoucherRedemptionPage(onSuccess: () {}, onFail: () {}),
),
);
await tester.pumpWidget(testWidget);
await tester.enterText(find.byType(MsisdnField), "0815029249");
await tester.tap(find.byType(PrimaryCardButton));
await tester.pump();
expect(find.text("Field is required"), findsOneWidget);
});
testWidgets(
'Voucher Redemption: A successful server response yields a success dialog',
(WidgetTester tester) async {
Widget testWidget = MediaQuery(
data: MediaQueryData(),
child: MaterialApp(
home: VoucherRedemptionPage(onSuccess: () {}, onFail: () {}),
),
);
await tester.pumpWidget(testWidget);
await tester.enterText(find.byType(PlainTextField), "0000000000");
await tester.enterText(find.byType(MsisdnField), "0815029249");
await tester.tap(find.text("REDEEM"));
await tester.pump();
expect(find.byType(SuccessDialog), findsOneWidget);
});
testWidgets(
'Voucher Redemption: An unsuccessful server response yields an error dialog',
(WidgetTester tester) async {
Widget testWidget = MediaQuery(
data: MediaQueryData(),
child: MaterialApp(
home: VoucherRedemptionPage(onSuccess: () {}, onFail: () {}),
),
);
await tester.pumpWidget(testWidget);
gToken = "invalid";
await tester.enterText(find.byType(PlainTextField), "0000000000");
await tester.enterText(find.byType(MsisdnField), "0815029249");
await tester.tap(find.byType(PrimaryCardButton));
await tester.pump();
gToken = "validToken";
expect(find.byType(ErrorDialog), findsOneWidget);
});
}
For additional reference, I have also included the code for the VoucherRedemptionPage and VoucherRedemptionScreen below:
class VoucherRedemptionPage extends StatelessWidget {
final onSuccess;
final onFail;
const VoucherRedemptionPage({Key key, #required this.onSuccess, #required this.onFail})
: super(key: key);
#override
Widget build(BuildContext context) {
var _voucherRedemptionBloc = new VoucherRedemptionBloc();
return Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/" + gFlavor + "/primary_background.png"),
fit: BoxFit.cover),
),
child: new Scaffold(
backgroundColor: Colors.transparent,
appBar: new AppBar(
title: new Text(gDictionary.find("Redeem Voucher")),
),
body: new VoucherRedemptionScreen(
voucherRedemptionBloc: _voucherRedemptionBloc,
onSuccess: this.onSuccess,
onFail: this.onFail,
),
),
);
}
}
class VoucherRedemptionScreen extends StatefulWidget {
const VoucherRedemptionScreen({
Key key,
#required VoucherRedemptionBloc voucherRedemptionBloc,
#required this.onSuccess,
#required this.onFail,
}) : _voucherRedemptionBloc = voucherRedemptionBloc,
super(key: key);
final VoucherRedemptionBloc _voucherRedemptionBloc;
final onSuccess;
final onFail;
#override
VoucherRedemptionScreenState createState() {
return new VoucherRedemptionScreenState(
_voucherRedemptionBloc, onSuccess, onFail);
}
}
class VoucherRedemptionScreenState extends State<VoucherRedemptionScreen> {
final VoucherRedemptionBloc _voucherRedemptionBloc;
final onSuccess;
final onFail;
TextEditingController _msisdnController = TextEditingController();
TextEditingController _voucherPinController = TextEditingController();
GlobalKey<FormState> _formKey = GlobalKey<FormState>();
VoucherRedemptionScreenState(
this._voucherRedemptionBloc, this.onSuccess, this.onFail);
#override
void initState() {
super.initState();
}
#override
void dispose() {
super.dispose();
}
#override
Widget build(BuildContext context) {
return BlocBuilder<VoucherRedemptionEvent, VoucherRedemptionState>(
bloc: _voucherRedemptionBloc,
builder: (
BuildContext context,
VoucherRedemptionState currentState,
) {
if (currentState is VoucherRedemptionInitial) {
_voucherPinController.text = currentState.scannedNumber;
return _buildFormCard();
}
if (currentState is VoucherRedemptionLoading) {
return Center(
child: CircularProgressIndicator(),
);
}
if (currentState is VoucherRedemptionSuccess) {
return SuccessDialog(
title: gDictionary.find("Voucher Redeemed Successfully"),
description: currentState.successMessage,
closeText: gDictionary.find("OK"),
closeAction: () {
this.onSuccess();
_voucherRedemptionBloc.dispatch(ResetVoucherRedemptionState());
},
);
}
if (currentState is VoucherRedemptionError) {
return ErrorDialog(
errorCode: currentState.errorCode,
errorMessage: currentState.errorMessage,
closeText: gDictionary.find("OK"),
closeAction: () {
this.onFail();
_voucherRedemptionBloc.dispatch(ResetVoucherRedemptionState());
},
);
}
},
);
}
Widget _buildFormCard() {
return Container(
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.only(
topLeft: Radius.circular(8), topRight: Radius.circular(8))),
padding: EdgeInsets.fromLTRB(12, 12, 12, 0),
width: double.infinity,
height: double.infinity,
child: _buildCardContent(),
);
}
Widget _buildCardContent() {
return SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
gDictionary.find("Transaction Amount"),
style: TextStyle(
fontSize: 14,
color: Theme.of(context).primaryColorDark,
fontWeight: FontWeight.bold),
),
Container(height: 16),
Form(
key: _formKey,
child: _buildFormContent(),
),
],
),
);
}
Column _buildFormContent() {
return Column(
children: <Widget>[
PlainTextField(
controller: _voucherPinController,
label: gDictionary.find("Voucher Number"),
required: true,
),
Container(height: 16),
MsisdnField(
controller: _msisdnController,
label: gDictionary.find("Mobile Number"),
required: true,
),
Divider(),
Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
SecondaryCardButton(
text: gDictionary.find("SCAN VOUCHER"),
onPressed: () {
_voucherRedemptionBloc.dispatch(
ScanBarcode(),
);
},
),
Container(
width: 8.0,
),
PrimaryCardButton(
text: gDictionary.find("REDEEM"),
onPressed: () {
if (_formKey.currentState.validate()) {
_voucherRedemptionBloc.dispatch(
RedeemVoucher(
_voucherPinController.text,
_msisdnController.text,
),
);
}
},
),
],
)
],
);
}
}
Found the problem. I was using the singleton pattern when creating an instance of the bloc - this caused states to persist across different widget objects. Very unlikely that anyone will encounter the same problem that I did but below is the code that I changed to mitigate the problem
Old problematic code:
class VoucherRedemptionBloc
extends Bloc<VoucherRedemptionEvent, VoucherRedemptionState> {
static final VoucherRedemptionBloc _voucherRedemptionBlocSingleton =
new VoucherRedemptionBloc._internal();
factory VoucherRedemptionBloc() {
return _voucherRedemptionBlocSingleton;
}
VoucherRedemptionBloc._internal();
//...
}
Updated working code:
class VoucherRedemptionBloc
extends Bloc<VoucherRedemptionEvent, VoucherRedemptionState> {
VoucherRedemptionBloc();
//...
}
That likely happens because your tests mutate some global variable but do not reset their value.
One way to make it safe is to always use setUp and tearDown instead of mutating variables directly the main scope:
int global = 0;
void main() {
final initialGlobalValue = global;
setUp(() {
global = 42;
});
tearDown(() {
global = initialGlobalValue;
});
test('do something with "global"', () {
expect(++global, 43);
});
test('do something with "global"', () {
// would fail without setUp/tearDown
expect(++global, 43);
});
}
Similarly, if a test needs to modify a variable, use addTearDown instead of manually resetting the value later in the test.
DON'T:
int global = 0;
test("don't", () {
global = 43;
expect(global, 43);
global = 0;
})
DO:
int global = 0;
test('do', () {
global = 43;
addTearDown(() => global = 0);
expect(global, 43);
});
This ensures that the value will always be reset even if the tests fails – so that other test functions normally.
In my case I wasn't setting skipOffstage: false, doing something like this worked for me:
expect(find.text('text', skipOffstage: false), findsNWidgets(2));