Вы можете скопировать и вставить полный код ниже
DialogCollection().defaultDialog(context) означает выполнение этой функции
Вы можете вызвать Button с помощью DialogCollection().defaultDialog, чтобы передать адрес функции и передать context
фрагмент кода
Button("DEFAULT DIALOG", DialogCollection().defaultDialog, context)
Button(String text, Function callback, BuildContext context) {
return Column(
children: <Widget>[
Container(
width: 230,
child: RaisedButton(
onPressed: () {
callback(context);
},
рабочая демонстрация
полный код
import 'package:flutter/material.dart';
class DialogCollection {
defaultDialog(BuildContext context) {
return showDialog(
context: context,
//barrierDismissible: false, //on touch outside does not dismiss the dialog
builder: (BuildContext context) {
return WillPopScope(
//WillPopScope stops dismissing dialog on outside touch and back press
onWillPop: () {
Navigator.of(context).pop();
return null;
},
child: AlertDialog(
title: Text(
"Dialog Title",
textAlign: TextAlign.center,
),
titlePadding: const EdgeInsets.all(15.0),
titleTextStyle: TextStyle(
color: Colors.redAccent,
fontSize: 20,
fontWeight: FontWeight.bold,
),
content: Text("This is the description of the dialog."),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
color: Colors.lightBlueAccent,
textColor: Colors.white,
child: Text(
"Yes",
style: TextStyle(
fontSize: 18,
),
),
),
FlatButton(
onPressed: () {
Navigator.of(context).pop();
},
color: Colors.redAccent,
textColor: Colors.white,
child: Text(
"No",
style: TextStyle(
fontSize: 18,
),
),
),
],
),
);
});
}
}
class DialogPage extends StatefulWidget {
@override
_DialogPageState createState() => _DialogPageState();
}
class _DialogPageState extends State<DialogPage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Dialogs"),
),
body: Center(
child: SingleChildScrollView(
padding: EdgeInsets.only(top: 35),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
verticalDirection: VerticalDirection.down,
children: <Widget>[
Button(
"DEFAULT DIALOG", DialogCollection().defaultDialog, context),
//Button("DIALOG WITH ICON - 1", DialogCollection().customDialog_1(context)),
/* Button("Widget", DialogCollection().defaultDialog(context)),
Button("Widget", DialogCollection().defaultDialog(context)),
Button("Widget", DialogCollection().defaultDialog(context)),
Button("Widget", DialogCollection().defaultDialog(context)),*/
],
),
),
),
);
}
Button(String text, Function callback, BuildContext context) {
return Column(
children: <Widget>[
Container(
width: 230,
child: RaisedButton(
onPressed: () {
callback(context);
},
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(25.0),
//side: BorderSide(color: Colors.red)
),
color: Colors.blueGrey,
padding: EdgeInsets.only(
top: 12.0, bottom: 12.0, left: 40.0, right: 40.0),
textColor: Colors.white,
child: Text(
text,
textAlign: TextAlign.center,
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 18,
),
),
),
),
Container(
height: 35,
)
],
);
}
}
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: DialogPage(),
);
}
}
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: AppBar(
title: Text(widget.title),
),
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.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}