Created
November 21, 2021 12:20
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Build widgets in response to notifications (Flutter)
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import 'package:flutter/widgets.dart'; | |
typedef NotificationBuilderCallback<T extends Notification> = Widget Function( | |
BuildContext context, T? notification); | |
typedef NotificationCondition<T extends Notification> = bool Function( | |
T notification); | |
class NotificationConsumer<T extends Notification> extends StatefulWidget { | |
final NotificationBuilderCallback<T> builder; | |
final NotificationListenerCallback<T>? onNotification; | |
final NotificationCondition? when; | |
const NotificationConsumer({ | |
Key? key, | |
required this.builder, | |
this.onNotification, | |
this.when, | |
}) : super(key: key); | |
@override | |
_NotificationConsumerState createState() => _NotificationConsumerState<T>(); | |
} | |
class _NotificationConsumerState<T extends Notification> | |
extends State<NotificationConsumer<T>> { | |
T? _notification; | |
@override | |
Widget build(BuildContext context) => NotificationListener( | |
child: widget.builder(context, _notification), | |
onNotification: _onNotification, | |
); | |
bool _onNotification(T notification) { | |
if (widget.when?.call(notification) ?? true) { | |
setState(() => _notification = notification); | |
return widget.onNotification?.call(notification) == true; | |
} | |
return false; | |
} | |
} |
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