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Dart Extensions methods example 4
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData.dark(),
home: MyHomePage(title: 'Flutter Extension methods'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You can use Extension methods in Dart!',
).h1().paddingAll(20),
Text(
'You can use Extension methods in Flutter too!',
)
.h1(
style: TextStyle(
fontSize: 32,
color: Colors.blue,
),
)
.paddingAll(30),
],
),
),
);
}
}
extension TextExtensions on Text {
Text h1({TextStyle style}) {
final TextStyle defaultStyle = TextStyle(fontSize: 24, color: Colors.red);
return Text(data,
key: key,
locale: locale,
maxLines: maxLines,
overflow: overflow,
semanticsLabel: semanticsLabel,
softWrap: softWrap,
strutStyle: strutStyle,
textAlign: textAlign,
textDirection: textDirection,
textScaleFactor: textScaleFactor,
textWidthBasis: textWidthBasis,
style: (this.style ?? defaultStyle).merge(style ?? defaultStyle));
}
}
extension on Widget {
Widget paddingAll(double padding) => Padding(
padding: EdgeInsets.all(padding),
child: this,
);
}
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