flutter, static snackbar access

main.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      routes: {
        '/1': (ctx) => MyHome(),
        '/2': (ctx) => MySecondPage(),
      },
      initialRoute: '/1',
      debugShowCheckedModeBanner: false,
      builder: (ctx, child) {
        return Scaffold(
          body: Builder(builder: (ctx) {
            Snacker.context = ctx;
            return child;
          }),
        );
      },
    );
  }
}

class Snacker {
  static BuildContext _context;

  static set context(val) {
    _context = val;
  }

  static hide([SnackBarClosedReason reason = SnackBarClosedReason.remove]) {
    Scaffold.of(_context).hideCurrentSnackBar(reason: reason);
  }

  static show(SnackBar snackBar) {
    Scaffold.of(_context).showSnackBar(snackBar);
  }
}

class MyHome extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('home'),
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.dock),
            onPressed: () {
              Snacker.hide();
              Snacker.show(SnackBar(content: Text("snackbar page 1")));
            },
          ),
        ],
      ),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Text('hello home!'),
            RaisedButton(
              child: Text('go to page 2'),
              onPressed: () {
                Navigator.of(context).pushNamed('/2');
              },
            )
          ],
        ),
      ),
    );
  }
}

class MySecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('second page'),
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.dock),
            onPressed: () {
              Snacker.hide();
              Snacker.show(SnackBar(content: Text("snackbar page 2")));
            },
          ),
        ],
      ),
      body: Center(
        child: Text('hello, second page!'),
      ),
    );
  }
}