How to access BuildContext outside of a stateful or stateless widget?
You would need to wrap your Scaffold in a Staless or Stateful widget, so you can get the context, e.g.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { int _counter = 0; void _incrementCounter() { setState(() { _counter++; }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBarLayout(GlobalKey(debugLabel: 'someLabel'), appBarTitle: 'The Title', context: context,), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text( 'You have pushed the button this many times:', ), Text( '$_counter', style: Theme.of(context).textTheme.display1, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: _incrementCounter, tooltip: 'Increment', child: Icon(Icons.add), ), ); } } class AppBarLayout extends AppBar { final GlobalKey<ScaffoldState> _scaffoldKey; final String appBarTitle; final BuildContext context; AppBarLayout(this._scaffoldKey, {this.appBarTitle, this.context}): super( title: Text(appBarTitle), leading: IconButton( onPressed: () => _scaffoldKey.currentState.openDrawer(), iconSize: 28, icon: Icon(Icons.menu,color: Colors.white), ), actions: <Widget>[ IconButton( onPressed: () { print('Button pressed'); }, icon: Icon(Icons.account_box), padding: EdgeInsets.all(0.0), ), ], ); } |
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