Dart Extensions methods example 4

dart_extensions_methods_example_4.dart

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,
      );
}