Created
October 18, 2018 08:43
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@immutable | |
class StreamWidget<T> extends StatelessWidget { | |
final Stream<T> stream; | |
final DataBuilder<T> builder; | |
final LoadingBuilder loadingBuilder; | |
final ErrorBuilder errorBuilder; | |
StreamWidget( | |
{@required this.stream, | |
@required this.builder, | |
this.loadingBuilder, | |
this.errorBuilder}); | |
@override | |
Widget build(BuildContext context) => | |
StreamBuilder<T>(builder: (context, snapshot) { | |
if (snapshot.hasError) { | |
return errorBuilder != null | |
? errorBuilder(context, snapshot.error) | |
: Container(); | |
} | |
if (!snapshot.hasData) { | |
return loadingBuilder != null ? loadingBuilder(context) : Container(); | |
} | |
builder(context, snapshot.data); | |
}); | |
} | |
class MyFancyWidget extends StatefulWidget { | |
@override | |
_MyFancyWidgetState createState() => _MyFancyWidgetState(); | |
} | |
class _MyFancyWidgetState extends State<MyFancyWidget> { | |
@override | |
Widget build(BuildContext context) { | |
return StreamWidget<String>( | |
stream: Observable.just("Hello!").delay(Duration(seconds: 2)), | |
loadingBuilder: (context) => CircularProgressIndicator(), | |
builder: (context, message) => Text(message)); | |
} | |
} |
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