Flutter: bloc, how to show an alert dialog
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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 at 8:26
Little Monkey
10810
add a comment |
up vote
0
down vote
favorite
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 at 8:26
Little Monkey
10810
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
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 at 8:26
Little Monkey
10810
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 at 8:26
Little Monkey
10810
asked Nov 19 at 8:26
Little Monkey
10810
asked Nov 19 at 8:26
Little Monkey
10810
asked Nov 19 at 8:26
Little Monkey
10810
asked Nov 19 at 8:26
Little Monkey
10810
10810
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
1
down vote
accepted
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 at 13:43
Mateusz
1212
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 at 14:31
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
accepted
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 at 13:43
Mateusz
1212
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 at 14:31
add a comment |
up vote
1
down vote
accepted
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 at 13:43
Mateusz
1212
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 at 14:31
add a comment |
up vote
1
down vote
accepted
up vote
1
down vote
accepted
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 at 13:43
Mateusz
1212
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 at 13:43
Mateusz
1212
edited Nov 19 at 14:33
answered Nov 19 at 13:43
Mateusz
1212
answered Nov 19 at 13:43
Mateusz
1212
answered Nov 19 at 13:43
Mateusz
1212
1212
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 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 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 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 at 14:31
add a comment |
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