Flutter: bloc, how to show an alert dialog
I´m new in the bloc pattern and stream stuff. I want to show up an alert dialog when I press a button, but I can´t find a way to do it. Actually my code is:
Widget button() {
return RaisedButton(
child: Text('Show alert'),
color: Colors.blue[700],
textColor: Colors.white,
onPressed: () {
bloc.submit();
});
}
return Scaffold(
appBar: AppBar(
title: Text("Title"),
),
body: StreamBuilder(
stream: bloc.getAlert,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text("I have Dataaaaaa ${snapshot.data}");
} else
return ListView(
children: <Widget>[
Container(
button()
)
...
And the BLoC:
final _submissionController = StreamController();
Stream get submissionStream=> _submissionController.stream;
Sink get submissionSink=> _submissionController.sink;
I tried to do something like:
Widget button() {
return StreamBuilder(
stream: submissionStream
builder: (context, snapshot){
if (snapshot.hasData){
return showDialog(...)
}else
return RaisedButton(
child: Text('Show alert'),
color: Colors.blue[700],
textColor: Colors.white,
onPressed: () {
bloc.submit();
});
}
But, of course, it didn´t work.
view stream
flutter alert asked Nov 19 '18 at 8:26
Little MonkeyLittle Monkey
17411
add a comment |
I´m new in the bloc pattern and stream stuff. I want to show up an alert dialog when I press a button, but I can´t find a way to do it. Actually my code is:
Widget button() {
return RaisedButton(
child: Text('Show alert'),
color: Colors.blue[700],
textColor: Colors.white,
onPressed: () {
bloc.submit();
});
}
return Scaffold(
appBar: AppBar(
title: Text("Title"),
),
body: StreamBuilder(
stream: bloc.getAlert,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text("I have Dataaaaaa ${snapshot.data}");
} else
return ListView(
children: <Widget>[
Container(
button()
)
...
And the BLoC:
final _submissionController = StreamController();
Stream get submissionStream=> _submissionController.stream;
Sink get submissionSink=> _submissionController.sink;
I tried to do something like:
Widget button() {
return StreamBuilder(
stream: submissionStream
builder: (context, snapshot){
if (snapshot.hasData){
return showDialog(...)
}else
return RaisedButton(
child: Text('Show alert'),
color: Colors.blue[700],
textColor: Colors.white,
onPressed: () {
bloc.submit();
});
}
But, of course, it didn´t work.
view stream
flutter alert asked Nov 19 '18 at 8:26
Little MonkeyLittle Monkey
17411
add a comment |
I´m new in the bloc pattern and stream stuff. I want to show up an alert dialog when I press a button, but I can´t find a way to do it. Actually my code is:
Widget button() {
return RaisedButton(
child: Text('Show alert'),
color: Colors.blue[700],
textColor: Colors.white,
onPressed: () {
bloc.submit();
});
}
return Scaffold(
appBar: AppBar(
title: Text("Title"),
),
body: StreamBuilder(
stream: bloc.getAlert,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text("I have Dataaaaaa ${snapshot.data}");
} else
return ListView(
children: <Widget>[
Container(
button()
)
...
And the BLoC:
final _submissionController = StreamController();
Stream get submissionStream=> _submissionController.stream;
Sink get submissionSink=> _submissionController.sink;
I tried to do something like:
Widget button() {
return StreamBuilder(
stream: submissionStream
builder: (context, snapshot){
if (snapshot.hasData){
return showDialog(...)
}else
return RaisedButton(
child: Text('Show alert'),
color: Colors.blue[700],
textColor: Colors.white,
onPressed: () {
bloc.submit();
});
}
But, of course, it didn´t work.
view stream
flutter alert asked Nov 19 '18 at 8:26
Little MonkeyLittle Monkey
17411
I´m new in the bloc pattern and stream stuff. I want to show up an alert dialog when I press a button, but I can´t find a way to do it. Actually my code is:
Widget button() {
return RaisedButton(
child: Text('Show alert'),
color: Colors.blue[700],
textColor: Colors.white,
onPressed: () {
bloc.submit();
});
}
return Scaffold(
appBar: AppBar(
title: Text("Title"),
),
body: StreamBuilder(
stream: bloc.getAlert,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text("I have Dataaaaaa ${snapshot.data}");
} else
return ListView(
children: <Widget>[
Container(
button()
)
...
And the BLoC:
final _submissionController = StreamController();
Stream get submissionStream=> _submissionController.stream;
Sink get submissionSink=> _submissionController.sink;
I tried to do something like:
Widget button() {
return StreamBuilder(
stream: submissionStream
builder: (context, snapshot){
if (snapshot.hasData){
return showDialog(...)
}else
return RaisedButton(
child: Text('Show alert'),
color: Colors.blue[700],
textColor: Colors.white,
onPressed: () {
bloc.submit();
});
}
But, of course, it didn´t work.
view stream
flutter alert view stream
flutter alert asked Nov 19 '18 at 8:26
Little MonkeyLittle Monkey
17411
asked Nov 19 '18 at 8:26
Little MonkeyLittle Monkey
17411
asked Nov 19 '18 at 8:26
Little MonkeyLittle Monkey
17411
asked Nov 19 '18 at 8:26
Little MonkeyLittle Monkey
17411
asked Nov 19 '18 at 8:26
Little MonkeyLittle Monkey
17411
17411
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
You can't show a dialog when build working. When you have new data, then you create a new widget. Probably better for you will be not using the stream in this case, but if it necessary you should use
WidgetsBinding.instance.addPostFrameCallback((_) => yourFunction(context));
in your if
if (snapshot.hasData) {
WidgetsBinding.instance.addPostFrameCallback((_) => showDialogFunction(context));
}
This code will be launched after build method, so dialog will show immediately.
Bloc function always return widget, so always return button() or different wiget when stream has data
answered Nov 19 '18 at 13:43
MateuszMateusz
1562
Yes, probably is better to avoid using BLoC in these cases, but since I´m pretty new to it, I still have to learn how do things properly with it. However the way you suggested worked, so thank you!
– Little Monkey
Nov 19 '18 at 14:31
add a comment |
Here is what I did, it might be wrong as I'm also new to flutter. But works for my scenario.
Widget build(BuildContext context) {
final authBloc = BlocProvider.of<AuthBloc>(context);
authBloc.outServerResponse.listen((serverResponse) {
if (serverResponse.status == 'success') {
_navigateToLogin();
} else {
_showSnakBar(serverResponse.message);
}
});
.... Rest of the code which returns the widget,
which in my case is form widget with button for submitting as follows,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
authBloc.processRegister.add(_registrationData.toMap());
}
}
outServerResponse is the stream that outputs after finishing API POST call.
authBloc.processRegister is the input sink to pass form data to my Auth API Service Provider.
_nagivateToLogin & _showSnakBar are simple functions
_navigateToLogin() {
Navigator.of(context).pop();
}
_showSnakBar(String msg) {
Scaffold.of(context).showSnackBar(
SnackBar(
content: Text(msg),
),
);
}
answered Jan 4 at 9:31
blisssanblisssan
396
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can't show a dialog when build working. When you have new data, then you create a new widget. Probably better for you will be not using the stream in this case, but if it necessary you should use
WidgetsBinding.instance.addPostFrameCallback((_) => yourFunction(context));
in your if
if (snapshot.hasData) {
WidgetsBinding.instance.addPostFrameCallback((_) => showDialogFunction(context));
}
This code will be launched after build method, so dialog will show immediately.
Bloc function always return widget, so always return button() or different wiget when stream has data
answered Nov 19 '18 at 13:43
MateuszMateusz
1562
Yes, probably is better to avoid using BLoC in these cases, but since I´m pretty new to it, I still have to learn how do things properly with it. However the way you suggested worked, so thank you!
– Little Monkey
Nov 19 '18 at 14:31
add a comment |
You can't show a dialog when build working. When you have new data, then you create a new widget. Probably better for you will be not using the stream in this case, but if it necessary you should use
WidgetsBinding.instance.addPostFrameCallback((_) => yourFunction(context));
in your if
if (snapshot.hasData) {
WidgetsBinding.instance.addPostFrameCallback((_) => showDialogFunction(context));
}
This code will be launched after build method, so dialog will show immediately.
Bloc function always return widget, so always return button() or different wiget when stream has data
answered Nov 19 '18 at 13:43
MateuszMateusz
1562
Yes, probably is better to avoid using BLoC in these cases, but since I´m pretty new to it, I still have to learn how do things properly with it. However the way you suggested worked, so thank you!
– Little Monkey
Nov 19 '18 at 14:31
add a comment |
You can't show a dialog when build working. When you have new data, then you create a new widget. Probably better for you will be not using the stream in this case, but if it necessary you should use
WidgetsBinding.instance.addPostFrameCallback((_) => yourFunction(context));
in your if
if (snapshot.hasData) {
WidgetsBinding.instance.addPostFrameCallback((_) => showDialogFunction(context));
}
This code will be launched after build method, so dialog will show immediately.
Bloc function always return widget, so always return button() or different wiget when stream has data
answered Nov 19 '18 at 13:43
MateuszMateusz
1562
You can't show a dialog when build working. When you have new data, then you create a new widget. Probably better for you will be not using the stream in this case, but if it necessary you should use
WidgetsBinding.instance.addPostFrameCallback((_) => yourFunction(context));
in your if
if (snapshot.hasData) {
WidgetsBinding.instance.addPostFrameCallback((_) => showDialogFunction(context));
}
This code will be launched after build method, so dialog will show immediately.
Bloc function always return widget, so always return button() or different wiget when stream has data
answered Nov 19 '18 at 13:43
MateuszMateusz
1562
edited Nov 19 '18 at 14:33
answered Nov 19 '18 at 13:43
MateuszMateusz
1562
answered Nov 19 '18 at 13:43
MateuszMateusz
1562
answered Nov 19 '18 at 13:43
MateuszMateusz
1562
1562
Yes, probably is better to avoid using BLoC in these cases, but since I´m pretty new to it, I still have to learn how do things properly with it. However the way you suggested worked, so thank you!
– Little Monkey
Nov 19 '18 at 14:31
add a comment |
Yes, probably is better to avoid using BLoC in these cases, but since I´m pretty new to it, I still have to learn how do things properly with it. However the way you suggested worked, so thank you!
– Little Monkey
Nov 19 '18 at 14:31
Yes, probably is better to avoid using BLoC in these cases, but since I´m pretty new to it, I still have to learn how do things properly with it. However the way you suggested worked, so thank you!
– Little Monkey
Nov 19 '18 at 14:31
Yes, probably is better to avoid using BLoC in these cases, but since I´m pretty new to it, I still have to learn how do things properly with it. However the way you suggested worked, so thank you!
– Little Monkey
Nov 19 '18 at 14:31
add a comment |
Here is what I did, it might be wrong as I'm also new to flutter. But works for my scenario.
Widget build(BuildContext context) {
final authBloc = BlocProvider.of<AuthBloc>(context);
authBloc.outServerResponse.listen((serverResponse) {
if (serverResponse.status == 'success') {
_navigateToLogin();
} else {
_showSnakBar(serverResponse.message);
}
});
.... Rest of the code which returns the widget,
which in my case is form widget with button for submitting as follows,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
authBloc.processRegister.add(_registrationData.toMap());
}
}
outServerResponse is the stream that outputs after finishing API POST call.
authBloc.processRegister is the input sink to pass form data to my Auth API Service Provider.
_nagivateToLogin & _showSnakBar are simple functions
_navigateToLogin() {
Navigator.of(context).pop();
}
_showSnakBar(String msg) {
Scaffold.of(context).showSnackBar(
SnackBar(
content: Text(msg),
),
);
}
answered Jan 4 at 9:31
blisssanblisssan
396
add a comment |
Here is what I did, it might be wrong as I'm also new to flutter. But works for my scenario.
Widget build(BuildContext context) {
final authBloc = BlocProvider.of<AuthBloc>(context);
authBloc.outServerResponse.listen((serverResponse) {
if (serverResponse.status == 'success') {
_navigateToLogin();
} else {
_showSnakBar(serverResponse.message);
}
});
.... Rest of the code which returns the widget,
which in my case is form widget with button for submitting as follows,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
authBloc.processRegister.add(_registrationData.toMap());
}
}
outServerResponse is the stream that outputs after finishing API POST call.
authBloc.processRegister is the input sink to pass form data to my Auth API Service Provider.
_nagivateToLogin & _showSnakBar are simple functions
_navigateToLogin() {
Navigator.of(context).pop();
}
_showSnakBar(String msg) {
Scaffold.of(context).showSnackBar(
SnackBar(
content: Text(msg),
),
);
}
answered Jan 4 at 9:31
blisssanblisssan
396
add a comment |
Here is what I did, it might be wrong as I'm also new to flutter. But works for my scenario.
Widget build(BuildContext context) {
final authBloc = BlocProvider.of<AuthBloc>(context);
authBloc.outServerResponse.listen((serverResponse) {
if (serverResponse.status == 'success') {
_navigateToLogin();
} else {
_showSnakBar(serverResponse.message);
}
});
.... Rest of the code which returns the widget,
which in my case is form widget with button for submitting as follows,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
authBloc.processRegister.add(_registrationData.toMap());
}
}
outServerResponse is the stream that outputs after finishing API POST call.
authBloc.processRegister is the input sink to pass form data to my Auth API Service Provider.
_nagivateToLogin & _showSnakBar are simple functions
_navigateToLogin() {
Navigator.of(context).pop();
}
_showSnakBar(String msg) {
Scaffold.of(context).showSnackBar(
SnackBar(
content: Text(msg),
),
);
}
answered Jan 4 at 9:31
blisssanblisssan
396
Here is what I did, it might be wrong as I'm also new to flutter. But works for my scenario.
Widget build(BuildContext context) {
final authBloc = BlocProvider.of<AuthBloc>(context);
authBloc.outServerResponse.listen((serverResponse) {
if (serverResponse.status == 'success') {
_navigateToLogin();
} else {
_showSnakBar(serverResponse.message);
}
});
.... Rest of the code which returns the widget,
which in my case is form widget with button for submitting as follows,
onPressed: () {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
authBloc.processRegister.add(_registrationData.toMap());
}
}
outServerResponse is the stream that outputs after finishing API POST call.
authBloc.processRegister is the input sink to pass form data to my Auth API Service Provider.
_nagivateToLogin & _showSnakBar are simple functions
_navigateToLogin() {
Navigator.of(context).pop();
}
_showSnakBar(String msg) {
Scaffold.of(context).showSnackBar(
SnackBar(
content: Text(msg),
),
);
}
answered Jan 4 at 9:31
blisssanblisssan
396
answered Jan 4 at 9:31
blisssanblisssan
396
answered Jan 4 at 9:31
blisssanblisssan
396
answered Jan 4 at 9:31
blisssanblisssan
396
396
add a comment |
add a comment |
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