I've the following code, the code working fine. It retrieves News from DB and presents it in the ListView. The News have two types (1 and 2).
class NewsFragment extends StatefulWidget {
NewsFragment({Key? key, required this.eltype}) : super(key: key);
final int eltype;
#override State<StatefulWidget> createState() {
return new NewsFragmentState();
}
}
class NewsFragmentState extends State<NewsFragment> {
late Future <List<news_item>> futureData;
( ... )
Future <List<news_item>> fetchNews({eltype: 0, lu: 0}) async {
...
}
#override
initState() {
super.initState();
void getNewsfromDB({eltype: 0}) async {
futureData = fetchNews(eltype: eltype);
}
getNewsfromDB(eltype: widget.eltype);
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: FutureBuilder <List<news_item>> (
future: futureData,
builder: (context, snapshot) {
if (snapshot.hasData) {
List<news_item> data = snapshot.data!;
BDS_Utilities.BDS_log('Element Type:${widget.eltype} #${data.length}', 'build');
return
Scaffold(
body: (data.length > 0)
? ListView.separated(
(...)
There is a parameter to pass to the NewsFragment class, the class is called by a Drawer ...
_getDrawerItemWidget(int pos) {
switch (pos) {
case 1:
return new NewsFragment(eltype: 0);
case 2:
return new NewsFragment(eltype: 1);
case 3:
return new MapFragment();
...
other cases ...
If new NewsFragment(eltype: 0) is called and then new NewsFragment(eltype: 1), or vice versa, nothing changes, the initState() is not called so the content is not refreshed.
If new NewsFragment(eltype: 0) is called then new MapFragment(), then new NewsFragment(eltype: 1) the initState() is invoked and the content is refreshed since it is fetched from the DB via FetchNews function.
How can I refresh the content after several continuous NewsFragment calls with different parameters? How can I tell to NewsFragment to call initState() or didChangeDependencies()? Or only if eltype is different from the actual one.
Related
I have a Flutter widget which gets data from a server and renders a List. After getting the data, I parse the data and convert it to an internal object in my application, so the function is something like this:
Future<List<Data>> getData(Thing thing) async {
var response = await http.get(Uri.parse(MY_URL));
// do some processing
return data;
}
After that, I've defined a stateful widget which calls this function and takes the future to render a List.
class DataList extends StatefulWidget {
const DataList({Key key}) : super(key: key);
#override
_DataListState createState() => _DataListState();
}
class _DataListState extends State<DataList> {
Widget createListView(BuildContext context, AsyncSnapshot snapshot) {
List<Data> values = snapshot.data;
if (values.isEmpty) {
return NoResultsWidget('No results.');
}
return ListView.builder(
itemCount: values.length,
itemBuilder: (BuildContext context, int index) {
return values[index];
},
);
}
#override
Widget build(BuildContext context) {
var data = getSomething().then((thing) => getData(thing));
return FutureBuilder(
future: data,
builder: (BuildContext context, AsyncSnapshot snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
return CustomErrorWidget('Error');
case ConnectionState.waiting:
return LoadingWidget();
default:
if (snapshot.hasError) {
return CustomErrorWidget('Error.');
} else {
return createListView(context, snapshot);
}
}
},
);
}
}
Now, the code works just fine in this manner. But, when I try to move my data to be a class variable (of type Future<List>) that I update through the initState method, the variable just never updates. Example code below:
class _DataListState extends State<DataList> {
Future<List<Data>> data;
....
#override
void initState() {
super.initState();
updateData();
}
void updateData() {
data = getSomething().then((thing) => getData(thing));
}
....
}
I want to add a refresh indicator to update the data on refresh, and to do that I need to make my data a class variable to update it on refresh, but I can't seem to figure out how to make my data part of the state of the stateful widget and have it work. any help or guides to a github code example would be appreciated.
You need to wrap the assignment of the data variable in setState so that Flutter knows the variable changed and rebuilds your widget.
For example:
void updateData() {
setState(() {
data = getSomething().then((thing) => getData(thing));
});
}
I have been learning flutter for 2-3 months now and I feel I have a reached a fundamental roadblock with understanding state management. This post will be long unfortunately so please bare with me and I hope I put the right detail.
Problem Definition
I have a list of widgets in a shopping cart,im at the point where I click minus and it only has 1 left the widget must be removed.No matter what I try I cant get that widget to be removed. If I click back button and go back into cart the Item will not appear anymore.
I have considered other methods, like disposing the widget(that didn't seem to work) and I was busy implementing Visibility Show/hide widgets in Flutter programmatically
but that doesn't feel like the right way.If my understanding of providers,changeNotifiers,async and future builders,is correct the below method should work and I think its fundamental to my flutter journey to understand why it doesn't work.
Overview:The idea was to use the minus button on CartItemWidget to call a method that updates Json stored on the local device, then repopulate the List cartProdList in ProductProvider which calls
notifyListeners() and then should propagate everywhere the provider is used. Now I have used this pattern successfully 5 times now, the only different this time is it will be removing a widget which I haven't done before. But this should work dynamically if the future is based of the same provider right ?
function call order
CartItemWidget.onPressed:()
calls >>>
ProductProvider.cartMinusOne(String id)
calls >>>
ProductProvider.Future<List<Product>> cartProducts()
well here goes the code.I also wouldn't mind comments on things I could be doing better in all areas.
CartWidget
class CartWidget extends StatefulWidget {
#override
_CartWidgetState createState() => _CartWidgetState();
}
class _CartWidgetState extends State<CartWidget> {
var providerOfProd;
ProductProvider cartProdProvider = new ProductProvider();
#override
void initState() {
_productsList = new ProductsList();
super.initState();
providerOfProd = Provider.of<ProductProvider>(context, listen: false).cartProducts();
}
#override
Widget build(BuildContext context) {
........
Column(children: <Widget>[
FutureBuilder(
future: providerOfProd,
builder: (context, snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return Container(
width: 0,
height: 0,
);
case ConnectionState.done:
return ListView.separated(
..............
},
itemBuilder: (context, index) {
return CartItemWidget(
product: cartProdProvider.cartProdList.elementAt(index),
heroTag: 'cart',
quantity: cartProdProvider.cartProdList.elementAt(index).cartqty,
key: UniqueKey(),
);
},
);
.........
CartItemWidget
class CartItemWidget extends StatefulWidget {
CartItemWidget({Key key, this.product, this.heroTag, this.quantity = 1}) : super(key: key);
// ProductProvider cartProd = new ProductProvider();
String heroTag;
Product product;
int quantity;
#override
_CartItemWidgetState createState() => _CartItemWidgetState();
}
class _CartItemWidgetState extends State<CartItemWidget> {
#override
Widget build(BuildContext context) {
return Consumer<ProductProvider>(
builder: (context, productProv, _) => InkWell(
child: Container(
.............
child: Row(
children: <Widget>[
.............
IconButton(
onPressed: () {
setState(() {
productProv.cartMinusOne(widget.product.id);
widget.quantity = this.decrementQuantity(widget.quantity);
});
}
.............
ProductProvider
class ProductProvider with ChangeNotifier {
ProductProvider() {
cartProducts();
}
List<Product> cartProdList;
cartMinusOne(String id) async {
//Code to minus item,then return as a string to save as local jason
var test = jsonEncode(cartList);
saveLocalJson(test, 'cart.json');
cartProducts();
notifyListeners();
}
Future<List<Product>> cartProducts() async {
String jsonString = await JsonProvider().getProductJson();
String cartString = await getCartJson();
var filterProdList = (json.decode(jsonString) as List).map((i) => Product.fromJson(i)).toList();
//code to get match cart list to product list
cartProdList = filterProdList.where((element) => element.cartqty > 0).toList();
notifyListeners();
return cartProdList;
}
........................
Imagine two Widgets: Main that manages a tabbar and therefore holds several Widgets - and Dashboard.
On Main Constructor I create a first Instance of Dashboard and the other tabbar Widgets with some dummy data (they are getting fetched in the meanwhile in initState). I build these with Futurebuilder. Once the data arrived I want to create a new Instance of Dashboard, but it won't change.
class _MainState extends State<HomePage> {
var _tabs = <Widget>[];
Future<dynamic> futureData;
_MainState() {
_tabs.add(Dashboard(null));
}
#override
void initState() {
super.initState();
futureData = _getData();
}
#override
Widget build(BuildContext context) {
return FutureBuilder(
future: futureData,
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.data != null) {
tabs[0] = Dashboard(snapshot.data);
} else {
return CircularProgressIndicator();
}
});
}
}
class DashboardScreen extends StatefulWidget {
final data;
DashboardScreen(this.data,
{Key key})
: super(key: key) {
print('Dashboard Constructor: ' + data.toString());
}
#override
_DashboardScreenState createState() => _DashboardScreenState(data);
}
class _DashboardScreenState extends State<DashboardScreen> {
var data;
_DashboardScreenState(this.data);
#override
void initState() {
super.initState();
print('InitState: ' + data.toString());
}
#override
void didUpdateWidget(Widget oldWidget) {
super.didUpdateWidget(oldWidget);
print('didUpdateWidget');
}
#override
void didChangeDependencies() {
super.didChangeDependencies();
print('didChangeDependencies' + data.toString());
}
#override
Widget build(BuildContext context) {
return Text(data.toString());
}
}
When I print on several available methods it comes clear that the DasboardScreenState is not recreated. Only the DashboardScreen Constructor is called again when the data arrived, but not it's state...
flutter: MainConstructor: null
flutter: Dashboard Constructor: null
flutter: InitState: null
flutter: didChangeDependencies: null
flutter: Dashboard Constructor: MachineStatus.Manual <- Here the data arrived in futureBuilder
How can I force the State to recreate? I tried to use the key parameter with UniqueKey(), but that didn't worked. Also inherrited widget seems not to be the solution either, despite the fact that i don't know how to use it in my use case, because the child is only available in the ..ScreenState but not the updated data..
I could imagine to inform dashboardScreenState by using Stream: listen to messages and then call setState() - I think, but that's only a workaround.
Can anyone help me please :)?
I know I have had issues with the if statement before, try:
return FutureBuilder(
future: futureData,
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.hasData) { //use hasData
DataType data = snapshot.data; //Declare Values first
tabs[0] = Dashboard(data);
} else {
return CircularProgressIndicator();
}
});
in flutter I use a class to load values for switch widgets from a database and then update that database when the switch is toggled. Somehow I need to have that class call setstate on the calling function of the instance but it doesn't seem to work.
See the code below for an example.
The first switch is how I'd write it without the database class. That is working fine, when tapping the switch it both moves and the print shows that the value changed.
In the second switch widget however, I used the database class to build it but it doesn't seem to call the callback function correctly. The print always prints false.
I thought I tried all combinations of => and (){} but something is still amiss. I'm pretty sure the problem is how the callback is handled in the line: callBackFunctionForSetState();
maybe that should be called with callBackFunctionForSetState((){}); but that also doesn't work.
import 'package:flutter/material.dart';
void main() {
runApp(App());
}
bool myBool = true;
class App extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Title',
home: ScreenUpgrades(),
);
}
}
class ScreenUpgrades extends StatefulWidget {
#override
_ScreenUpgradesState createState() => _ScreenUpgradesState();
}
class _ScreenUpgradesState extends State<ScreenUpgrades> {
#override
Widget build(BuildContext ctxt) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Upgrades"),
),
body: FutureBuilder(
future: buildSwitchList(),
builder: (BuildContext ctxt, AsyncSnapshot snapshot) {
if (snapshot.hasData) {
return ListView(children: snapshot.data);
} else {
return Center(child: CircularProgressIndicator());
}
}));
}
Future<List> buildSwitchList() async {
List<Widget> widgetList = [];
//This one below for a working example only
widgetList.add(Switch(value: myBool,onChanged: (bb)=>nonDBSetState()));
//Normally I'll create a bunch of widgets by loading their data from the DB as below
widgetList.add(DataBaseSwitchBuilder(1,()=>setState((){})).listViewWidget);
return widgetList;
}
nonDBSetState()
{
myBool = !myBool;
print('New value of first switch: ' + myBool.toString());
setState((){});
}
}
class DataBaseSwitchBuilder {
Widget listViewWidget;
int dbID;
bool onOff;
Function callBackFunctionForSetState;
DataBaseSwitchBuilder (int paramID, Function callBack)
{
dbID=paramID; //used to query the parameter from the DB
onOff = true;
callBackFunctionForSetState=callBack;
listViewWidget=(Switch(value: onOff,onChanged: (bb)=> updateDBAndState()));
}
updateDBAndState()
{
//update the switch
onOff = !onOff;
print('DB Swtich value now: ' + onOff.toString());
//first we save the record in the DB
//todo: code for updating DB
//Then call the passed function which should be a setstate from the calling function
//Below doesn't seem to work.
callBackFunctionForSetState();
}
}
I'm just expecting that the updateDBAndState will allow me to save the new value of the switch to the database and then call the setstate callback.
Just to respond to "How to pass setstate as a parameter to a class method"
widget controler
class Controller {
Controller._privateConstructor();
factory Controller() => _singleton;
static final Controller _singleton =
Controller._privateConstructor();
late Function setStateHandler;
void initSetState(Function setState) => setStateHandler = setState;
void triggerSetState() => setStateHandler();
}
widget
#override
void initState() {
super.initState();
controller.initSetState(() => setState(() {
widgetVariable = true;
}));
}
I'm using an inherited Widget to access a Bloc with some long running task (e.g. search).
I want to trigger the search on page 1 and continue to the next page when this is finished. Therefore I'm listening on a stream and wait for the result to happen and then navigate to the result page.
Now, due to using an inherited widget to access the Bloc I can't access the bloc with context.inheritFromWidgetOfExactType() during initState() and the exception as I read it, recommends doing this in didChangeDependencies().
Doing so this results in some weird behavior as the more often I go back and forth, the more often the stream I access fires which would lead to the second page beeing pushed multiple times. And this increases with each back and forth interaction. I don't understand why the stream why this is happening. Any insights here are welcome. As a workaround I keep a local variable _onSecondPage holding the state to avoid pushing several times to the second Page.
I found now How to call a method from InheritedWidget only once? which helps in my case and I could access the inherited widget through context.ancestorInheritedElementForWidgetOfExactType() and just listen to the stream and navigate to the second page directly from initState().
Then the stream behaves as I would expect, but the question is, does this have any other side effects, so I should rather get it working through listening on the stream in didChangeDependencides() ?
Code examples
My FirstPage widget listening in the didChangeDependencies() on the stream. Working, but I think I miss something. The more often i navigate from first to 2nd page, the second page would be pushed multiple times on the navigation stack if not keeping a local _onSecondPage variable.
#override
void didChangeDependencies() {
super.didChangeDependencies();
debugPrint("counter: $_counter -Did change dependencies called");
// This works the first time, after that going back and forth to the second screen is opened several times
BlocProvider.of(context).bloc.finished.stream.listen((bool isFinished) {
_handleRouting(isFinished);
});
}
void _handleRouting(bool isFinished) async {
if (isFinished && !_onSecondPage) {
_onSecondPage = true;
debugPrint("counter: $_counter - finished: $isFinished : ${DateTime.now().toIso8601String()} => NAVIGATE TO OTHER PAGE");
await Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),
);
_onSecondPage = false;
} else {
debugPrint("counter: $_counter - finished: $isFinished : ${DateTime.now().toIso8601String()} => not finished, nothing to do now");
}
}
#override
void dispose() {
debugPrint("counter: $_counter - disposing my homepage State");
subscription?.cancel();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
StreamBuilder(
stream: BlocProvider.of(context).bloc.counter.stream,
initialData: 0,
builder: (context, snapshot) {
_counter = snapshot.data;
return Text(
"${snapshot.data}",
style: Theme.of(context).textTheme.display1,
);
},
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
A simple Bloc faking some long running work
///Long Work Bloc
class LongWorkBloc {
final BehaviorSubject<bool> startLongWork = BehaviorSubject<bool>();
final BehaviorSubject<bool> finished = BehaviorSubject<bool>();
int _counter = 0;
final BehaviorSubject<int> counter = BehaviorSubject<int>();
LongWorkBloc() {
startLongWork.stream.listen((bool start) {
if (start) {
debugPrint("Start long running work");
Future.delayed(Duration(seconds: 1), () => {}).then((Map<dynamic, dynamic> reslut) {
_counter++;
counter.sink.add(_counter);
finished.sink.add(true);
finished.sink.add(false);
});
}
});
}
dispose() {
startLongWork?.close();
finished?.close();
counter?.close();
}
}
Better working code
If I however remove the code to access the inherited widget from didChangeDependencies() and listen to the stream in the initState() it seems to be working properly.
Here I get hold of the inherited widget holding the stream through context.ancestorInheritedElementForWidgetOfExactType()
Is this ok to do so? Or what would be a flutter best practice in this case?
#override
void initState() {
super.initState();
//this works, but I don't know if this is good practice or has any side effects?
BlocProvider p = context.ancestorInheritedElementForWidgetOfExactType(BlocProvider)?.widget;
if (p != null) {
p.bloc.finished.stream.listen((bool isFinished) {
_handleRouting(isFinished);
});
}
}
Personally, I have not found any reason not to listen to BLoC state streams in initState. As long as you remember to cancel your subscription on dispose
If your BlocProvider is making proper use of InheritedWidget you should not have a problem getting your value inside of initState.
like So
void initState() {
super.initState();
_counterBloc = BlocProvider.of(context);
_subscription = _counterBloc.stateStream.listen((state) {
if (state.total > 20) {
Navigator.push(context,
MaterialPageRoute(builder: (BuildContext context) {
return TestPush();
}));
}
});
}
Here is an example of a nice BlocProvider that should work in any case
import 'package:flutter/widgets.dart';
import 'bloc_base.dart';
class BlocProvider<T extends BlocBase> extends StatefulWidget {
final T bloc;
final Widget child;
BlocProvider({
Key key,
#required this.child,
#required this.bloc,
}) : super(key: key);
#override
_BlocProviderState<T> createState() => _BlocProviderState<T>();
static T of<T extends BlocBase>(BuildContext context) {
final type = _typeOf<_BlocProviderInherited<T>>();
_BlocProviderInherited<T> provider =
context.ancestorInheritedElementForWidgetOfExactType(type)?.widget;
return provider?.bloc;
}
static Type _typeOf<T>() => T;
}
class _BlocProviderState<T extends BlocBase> extends State<BlocProvider<BlocBase>> {
#override
Widget build(BuildContext context) {
return _BlocProviderInherited<T>(
bloc: widget.bloc,
child: widget.child,
);
}
#override
void dispose() {
widget.bloc?.dispose();
super.dispose();
}
}
class _BlocProviderInherited<T> extends InheritedWidget {
final T bloc;
_BlocProviderInherited({
Key key,
#required Widget child,
#required this.bloc,
}) : super(key: key, child: child);
#override
bool updateShouldNotify(InheritedWidget oldWidget) => false;
}
... and finally the BLoC
import 'dart:async';
import 'bloc_base.dart';
abstract class CounterEventBase {
final int amount;
CounterEventBase({this.amount = 1});
}
class CounterIncrementEvent extends CounterEventBase {
CounterIncrementEvent({amount = 1}) : super(amount: amount);
}
class CounterDecrementEvent extends CounterEventBase {
CounterDecrementEvent({amount = 1}) : super(amount: amount);
}
class CounterState {
final int total;
CounterState(this.total);
}
class CounterBloc extends BlocBase {
CounterState _state = CounterState(0);
// Input Streams/Sinks
final _eventInController = StreamController<CounterEventBase>();
Sink<CounterEventBase> get events => _eventInController;
Stream<CounterEventBase> get _eventStream => _eventInController.stream;
// Output Streams/Sinks
final _stateOutController = StreamController<CounterState>.broadcast();
Sink<CounterState> get _states => _stateOutController;
Stream<CounterState> get stateStream => _stateOutController.stream;
// Subscriptions
final List<StreamSubscription> _subscriptions = [];
CounterBloc() {
_subscriptions.add(_eventStream.listen(_handleEvent));
}
_handleEvent(CounterEventBase event) async {
if (event is CounterIncrementEvent) {
_state = (CounterState(_state.total + event.amount));
} else if (event is CounterDecrementEvent) {
_state = (CounterState(_state.total - event.amount));
}
_states.add(_state);
}
#override
void dispose() {
_eventInController.close();
_stateOutController.close();
_subscriptions.forEach((StreamSubscription sub) => sub.cancel());
}
}