I define a model reactively with GetX and send this model reactively to the view with the help of StateMixin. But this variable I sent changes the main variable as well. How exactly does this happen and how can I fix it? In the example I gave below, when I change the id value, the id automatically changes in the rawMyModel model. But I don't want it to change.
detail_controller.dart
class DetailController extends GetxController with StateMixin<Rx<MyModel>> {
late final MyModel rawMyModel;
#override
void onInit() async {
super.onInit();
rawMyModel = (Get.arguments as MyModel);
change(Rx(rawMyModel), status: RxStatus.success());
}
void reset() {
change(Rx(rawMyModel), status: RxStatus.success());
}
}
detail_page.dart
class DetailPage extends GetView<DetailController> {
const DetailPage({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
body: controller.obx((Rx<MyModel>? myModel) => _buildBody(myModel: myModel!)),
);
}
Widget _buildBody({required Rx<MyModel> myModel}) {
print(myModel.value.toString());
myModel.update((val) => val.id = 5); // change
}
}
Related
I'm new to Riverpod and am trying to migrate an app over from Provider. If I had a TextField and wanted to set its value based on my Provider model, I would do this:
class MyWidget extends StatefulWidget{
const MyWidget({ Key? key }) : super(key: key);
#override
State<MyWidget> createState() => _MyWidgetState();
}
class _MyWidgetState extends State<MyWidget> {
var controller = TextEditingController();
#override
void didChangeDependencies() {
super.didChangeDependencies();
//Set the value here...
var model = Provider.of<Model>(context);
controller.text = model.name;
}
Widget build(BuildContext context) {
return TextField(controller: controller)
}
}
As I understand it, didChangeDependencies() would listen to changes from Provider.of<Model>(context) and update my controller accordingly.
I'm trying to pull off the same thing with Provider, but I can't ever get the TextField's value to show up.
class MyWidget extends ConsumerStatefulWidget {
const MyWidget({Key? key}) : super(key: key);
#override
ConsumerState<ConsumerStatefulWidget> createState() => _MyWidgetState();
}
class _MyWidgetState extends ConsumerState<MyWidget> {
var controller = TextEditingController();
#override
void didChangeDependencies() {
super.didChangeDependencies();
//Trying the same thing here...
final name = ref.watch(providerName);
controller.text = name;
}
Widget build(BuildContext context) {
final name = ref.watch(providerName);
return Column(
children: [
//This doesn't work:
TextField(controller: controller),
//I know my provider has the value, because this works fine:
Text(name),
]
}
}
How can I get my TextEditingController's text property to update?
From Riverpod official website
///1.Create a [StateNotifier] sub-class, StateNotifier is something where you can define functions that can change your state like in this state is of String type, you also can use objects (Classes instead of primitive types)
class Counter extends StateNotifier<String> {
Counter() : super('');
void changeText(String text){
state=text;
}
///2.Create a provider [StateNotifierProvider] with this you can use in your widget
final counterProvider = StateNotifierProvider<Counter, String>((ref) {
return Counter();
});
///3.Consume the Provider this is how we can attach state with our widget
class Home extends ConsumerWidget {
#override
Widget build(BuildContext context, WidgetRef ref) {
final text = ref.watch(counterProvider);
return Text('$text');
}
}
so here you can add you widget like button and onTap executes the code like
onTap()=>changeText(textController.text);
So your text [Text('$text');] will automatically change.
String inputText = controller.text;
This is a case.
I want to use one TimerWidget for 1+ forms.
And i don`t want to save its state in the Store.
So I created it as an Event, and realized like this.
/// Action
class TimeIsOnAction extends AppAction {
TimeIsOnAction(this.timerCounter);
final int timerCounter;
#override
Future<AppState?> reduce() async {
return state.copyWith(timerCounter: Event(timerCounter));
}
}
/// Widget
class TimerWidget extends StatelessWidget {
const TimerWidget({Key? key, required this.timerCounter}) : super(key: key);
final Event<int> timerCounter;
#override
Widget build(BuildContext context) {
final timer = timerCounter.state ?? 0;
// !!!! Consume or Not ???
timerCounter.consume();
return Center(child: Text('$timer'));
}
}
//////////////////////////////////////////////////////////////////////////////
/// Connector
class TimerWidgetConnector extends StatelessWidget {
const TimerWidgetConnector({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return StoreConnector<AppState, _Vm>(
vm: () => _Factory(),
builder: (context, vm) {
return TimerWidget(
timerCounter: vm.timerCounter,
);
},
);
}
}
///
class _Factory extends AppVmFactory {
#override
_Vm fromStore() {
return _Vm(
timerCounter: state.timerCounter,
);
}
}
///
class _Vm extends Vm {
final Event<int> timerCounter;
_Vm({
required this.timerCounter,
}) : super(equals: [timerCounter]);
}
/// Persisting
#override
Future<void> persistDifference(
{AppState? lastPersistedState, required AppState newState}) async {
if (lastPersistedState == null || lastPersistedState != newState) {
return _safeWrapperS(() async {
final json = newState.toJson();
final s = jsonEncode(json);
_saveString(_appStateKey, s);
return;
});
}
}
/// Applying 1
children: [
const Center(child: TimerWidgetConnector()),
Center(child: Text('$isDarkMode')),
/// Applying 2
10.verticalSpace,
const Center(child: TimerWidgetConnector()),
10.verticalSpace,
But! If i consume event in TimerWidget.build after applying - it works only on one Form
If i don't consume - its state automatically persisted with every event changing.
Is there recipe for that case?
I hope you could help me!
Error saying 'tables' has not been initiliazed. But when I set tables = [] instead of
widget.data.then((result) {tables = result.tables;})
it works. I think the problem comes from my app state data which is a Future.
My simplified code:
class NavBar extends StatefulWidget {
final Future<Metadata> data;
const NavBar({Key? key, required this.data}) : super(key: key);
#override
State<NavBar> createState() => _NavBarState();
}
class _NavBarState extends State<NavBar> {
late List<MyTable> tables;
#override
void initState() {
widget.data.then((result) {
tables = result.tables;
});
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: buildPages(page.p)
)
);
}
Widget buildPages(index){
switch (index) {
case 0:
return ShowTablesNew(tables: tables);
case 1:
return const Details();
case 2:
return const ShowTables();
default:
return const ShowTables();
}
}
}
Future doesn't contain any data. It's an asynchronous computation that will provide data "later". The initialization error happens because the variable 'tables' is marked as late init but is accessed before the future is completed, when in fact it's not initialized yet.
Check this codelab for async programming with dart.
For your code you can use async/await in the initState method doing something like this
String user = '';
#override
void initState() {
asyncInitState();
super.initState();
}
void asyncInitState() async {
final result = await fetchUser();
setState(() {
user = result;
});
}
but since you're using a list of custom objects the most straightforward way is probably to use a FutureBuilder widget
I'm still a beginner with streams and bloc pattern.
I would like to do following:
Trigger an event.
Based on the event get back a state with an object
Store this object as JSON in a database.
All examples are showing, how an object can be displayed in a widget with BlocBuilder. But I don't need to display the value, only get it and store it. I can't figure out how to get the value into a variable.
How can I do that? In the View class I'm dispatching the event, but now I need to know how to get the object in the state back without using BlocBuilder.
Here are the details:
Bloc
class SchoolBloc extends Bloc<SchoolEvent, SchoolState> {
final SchoolRepository _schoolRepository;
StreamSubscription _schoolSubscription;
SchoolBloc({#required SchoolRepository schoolRepository})
: assert(schoolRepository != null),
_schoolRepository = schoolRepository;
#override
SchoolState get initialState => SchoolsLoading();
#override
Stream<SchoolState> mapEventToState(SchoolEvent event) async* {
if (event is LoadSchool) {
yield* _mapLoadSchoolToState();
Stream<SchoolState> _mapLoadSchoolToState(LoadSchool event) async* {
_schoolSubscription?.cancel();
_schoolSubscription = _schoolRepository.school(event.id).listen(
(school) {
SchoolLoaded(school);
}
);
}
Event
#immutable
abstract class SchoolEvent extends Equatable {
SchoolEvent([List props = const []]) : super(props);
}
class LoadSchool extends SchoolEvent {
final String id;
LoadSchool(this.id) : super([id]);
#override
String toString() => 'LoadSchool';
}
State
#immutable
abstract class SchoolState extends Equatable {
SchoolState([List props = const []]) : super(props);
}
class SchoolLoaded extends SchoolState {
final School school;
SchoolLoaded([this.school]) : super([school]);
#override
String toString() => 'SchoolLoaded { school: $school}';
}
View
class CourseView extends StatefulWidget {
#override
State<StatefulWidget> createState() => _CourseViewState();
}
class _CourseViewState extends State<CourseView> {
#override
initState() {
super.initState();
print("this is my init text");
final _schoolBloc = BlocProvider.of<SchoolBloc>(context);
_schoolBloc.dispatch(LoadSchool("3kRHuyk20UggHwm4wrUI"));
// Here I want to get back the school object and save it to a db
}
Test that fails
For testing purposes I have done following:
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:teach_mob/core/blocs/school/school.dart';
class CourseView extends StatefulWidget {
#override
State<StatefulWidget> createState() => _CourseViewState();
}
class _CourseViewState extends State<CourseView> {
#override
void initState() {
super.initState();
BlocProvider.of<SchoolBloc>(context)
.dispatch(LoadSchool("3kRHuyk20UggHwm4wrUI"));
}
#override
Widget build(BuildContext context) {
return BlocListener<SchoolBloc, SchoolState>(
listener: (context, state) {
print("BlocListener is triggered");
},
child: Text("This is a test")
);
}
}
The LoadSchool event is triggered. The text in the child attribute of BlocListener is displayed, but the listener function that should print "BlocListener is triggered" is not executed.
Use BlocListener. It is meant to be used for those cases you mention.
I have 2 screens in my Flutter app: a list of records and a screen for creating and editing records.
If I pass an object to the second screen that means I am going to edit this and if I pass null it means that I am creating a new item. The editing screen is a Stateful widget and I am not sure how to use this approach https://flutter.io/cookbook/navigation/passing-data/ for my case.
class RecordPage extends StatefulWidget {
final Record recordObject;
RecordPage({Key key, #required this.recordObject}) : super(key: key);
#override
_RecordPageState createState() => new _RecordPageState();
}
class _RecordPageState extends State<RecordPage> {
#override
Widget build(BuildContext context) {
//.....
}
}
How can I access recordObject inside _RecordPageState?
To use recordObject in _RecordPageState, you have to just write widget.objectname like below
class _RecordPageState extends State<RecordPage> {
#override
Widget build(BuildContext context) {
.....
widget.recordObject
.....
}
}
Full Example
You don't need to pass parameters to State using it's constructor.
You can easily access these using widget.myField.
class MyRecord extends StatefulWidget {
final String recordName;
const MyRecord(this.recordName);
#override
MyRecordState createState() => MyRecordState();
}
class MyRecordState extends State<MyRecord> {
#override
Widget build(BuildContext context) {
return Text(widget.recordName); // Here you direct access using widget
}
}
Pass your data when you Navigate screen :
Navigator.of(context).push(MaterialPageRoute(builder: (context) => MyRecord("WonderWorld")));
class RecordPage extends StatefulWidget {
final Record recordObject;
RecordPage({Key key, #required this.recordObject}) : super(key: key);
#override
_RecordPageState createState() => new _RecordPageState(recordObject);
}
class _RecordPageState extends State<RecordPage> {
Record recordObject
_RecordPageState(this. recordObject); //constructor
#override
Widget build(BuildContext context) {. //closure has access
//.....
}
}
example as below:
class nhaphangle extends StatefulWidget {
final String username;
final List<String> dshangle;// = ["1","2"];
const nhaphangle({ Key key, #required this.username,#required this.dshangle }) : super(key: key);
#override
_nhaphangleState createState() => _nhaphangleState();
}
class _nhaphangleState extends State<nhaphangle> {
TextEditingController mspController = TextEditingController();
TextEditingController soluongController = TextEditingController();
final scrollDirection = Axis.vertical;
DateTime Ngaysx = DateTime.now();
ScrollController _scrollController = new ScrollController();
ApiService _apiService;
List<String> titles = [];
#override
void initState() {
super.initState();
_apiService = ApiService();
titles = widget.dshangle; //here var is call and set to
}
I have to Navigate back to any one of the screens in the list pages but when I did that my onTap function stops working and navigation stops.
class MyBar extends StatefulWidget {
MyBar({this.pageNumber});
final pageNumber;
static const String id = 'mybar_screen';
#override
_MyBarState createState() => _MyBarState();
}
class _MyBarState extends State<MyBar> {
final List pages = [
NotificationScreen(),
AppointmentScreen(),
RequestBloodScreen(),
ProfileScreen(),
];
#override
Widget build(BuildContext context) {
var _selectedItemIndex = widget.pageNumber;
return Scaffold(
bottomNavigationBar: BottomNavigationBar(
elevation: 0,
backgroundColor: Colors.white,
unselectedItemColor: Colors.grey.shade700,
selectedItemColor: Color(kAppColor),
selectedIconTheme: IconThemeData(color: Color(kAppColor)),
currentIndex: _selectedItemIndex,
type: BottomNavigationBarType.fixed,
onTap: (int index) {
setState(() {
_selectedItemIndex = index;
});
},
You should use a Pub/Sub mechanism.
I prefer to use Rx in many situations and languages. For Dart/Flutter this is the package: https://pub.dev/packages/rxdart
For example, you can use a BehaviorSubject to emit data from widget A, pass the stream to widget B which listens for changes and applies them inside the setState.
Widget A:
// initialize subject and put it into the Widget B
BehaviorSubject<LiveOutput> subject = BehaviorSubject();
late WidgetB widgetB = WidgetB(deviceOutput: subject);
// when you have to emit new data
subject.add(deviceOutput);
Widget B:
// add stream at class level
class WidgetB extends StatefulWidget {
final ValueStream<LiveOutput> deviceOutput;
const WidgetB({Key? key, required this.deviceOutput}) : super(key: key);
#override
State<WidgetB> createState() => _WidgetBState();
}
// listen for changes
#override
void initState() {
super.initState();
widget.deviceOutput.listen((event) {
print("new live output");
setState(() {
// do whatever you want
});
});
}
In my app, often instead of using stateful widgets, I use mainly ChangeNotifierProvider<T> in main.dart, some model class
class FooModel extends ChangeNotifier {
var _foo = false;
void changeFooState() {
_foo = true;
notifyListeners();
}
bool getFoo () => _foo;
}
and
var foo = context.read<FooModel>();
# or
var foo = context.watch<FooModel>();
in my stateless widgets. IMO this gives me more precise control over the rebuilding upon runtime state change, compared to stateful widgets.
The recipe can be found in the official docs, the concept is called "lifting state up".