47 lines
970 B
Dart
47 lines
970 B
Dart
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import 'package:flutter/material.dart';
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typedef Widget ChangeNotifierWidgetBuilder<T extends ChangeNotifier>(
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BuildContext context,
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T value,
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);
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class ChangeNotifierBuilder<T extends ChangeNotifier> extends StatefulWidget {
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final ChangeNotifierWidgetBuilder<T> builder;
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final T value;
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const ChangeNotifierBuilder({
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Key key,
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@required this.builder,
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@required this.value,
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}) : super(key: key);
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@override
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_ChangeNotifierBuilderState createState() => _ChangeNotifierBuilderState();
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}
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class _ChangeNotifierBuilderState extends State<ChangeNotifierBuilder> {
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@override
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void initState() {
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super.initState();
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widget.value.addListener(_onChange);
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}
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void _onChange() {
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if (mounted) {
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setState(() {});
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}
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}
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@override
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void dispose() {
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widget.value.removeListener(_onChange);
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return widget.builder(context, widget.value);
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}
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}
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