import 'dart:io'; import 'package:flutter/material.dart'; class NotificationProvider extends StatefulWidget { final Widget child; NotificationProvider({@required this.child}); static _NotificationProviderState of(BuildContext context) { return (context.inheritFromWidgetOfExactType(_InheritedNotificationProvider) as _InheritedNotificationProvider) .data; } @override _NotificationProviderState createState() => new _NotificationProviderState(); } class _NotificationProviderState extends State { int count = 0; @override void initState() { super.initState(); } void setCount(int value) { setState(() { count = value; }); } @override Widget build(BuildContext context) { return new _InheritedNotificationProvider( data: this, child: widget.child, ); } } class _InheritedNotificationProvider extends InheritedWidget { final _NotificationProviderState data; _InheritedNotificationProvider({ Key key, @required this.data, @required Widget child, }) : super(key: key, child: child); @override bool updateShouldNotify(_InheritedNotificationProvider old) => true; }