SnackBar
1 2 | SnackBar({ @required Widget content, Color backgroundColor, SnackBarAction action, Duration duration: _kSnackBarDisplayDuration, Animation animation }) Scaffold.of(context).showSnackBar() |
açıklama
Ekranın alt kısmında kısa bir süre görüntülenen isteğe bağlı eylem ile hafif bir mesaj sunar.
parametreler
1 2 3 4 5 6 7 | SnackBar({ @required Widget content, Color backgroundColor, SnackBarAction action, Duration duration: _kSnackBarDisplayDuration, Animation animation }) |
örnek uygulama
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 88 89 90 | import 'package:flutter/material.dart'; void main() => runApp(new MyApp()); class MyApp extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return new MaterialApp( title: 'Flutter Demo', theme: new ThemeData( primarySwatch: Colors.blue, ), home: new MyHomePage(title: 'Show Snackbar'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => new _MyHomePageState(); } class _MyHomePageState extends State { final GlobalKey _scaffoldKey = new GlobalKey(); @override Widget build(BuildContext context) { return Scaffold( key: _scaffoldKey, appBar: new AppBar( title: new Text(widget.title), ), body: Row( mainAxisAlignment: MainAxisAlignment.center, children: [ Column( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ RaisedButton( color: Colors.red, child: Text('Snackbar that throws error'), onPressed: () { Scaffold.of(context).showSnackBar(SnackBar( content: Text('It throws error'), duration: Duration(seconds: 3), )); }), Builder( builder: (context) => RaisedButton( color: Colors.green, child: Text('Show Snackbar using context from Builder'), onPressed: () { Scaffold.of(context).showSnackBar(SnackBar( content: Text('Context from Builder'), duration: Duration(seconds: 3), )); }), ), SeparateWidget(), RaisedButton( color: Colors.yellow, child: Text('Show Snackbar using a GlobalKey'), onPressed: () { _scaffoldKey.currentState.showSnackBar(SnackBar( content: Text('Assign a GlobalKey to the Scaffold'), duration: Duration(seconds: 3), )); }), ], ), ], ), // This trailing comma makes auto-formatting nicer for build methods. ); } } class SeparateWidget extends StatelessWidget { @override Widget build(BuildContext context) { return RaisedButton( color: Colors.blueAccent, child: Text("Button moved to separate widget"), onPressed: () { Scaffold.of(context).showSnackBar(SnackBar( content: Text('Button moved to separate widget'), duration: Duration(seconds: 3), )); }); } } |
