flutter RaisedButton

import 'package:flutter/material.dart';

void main() {
  runApp( MaterialApp(
    title: 'Flutter gesture',
//    home: TutorialHome(),
    home: _home(),
  ));
}


class _home extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _homeState();
  }
}

class _homeState extends State<_home> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          const RaisedButton(
            onPressed: null,
            child: Text(
                'Disabled Button',
                style: TextStyle(fontSize: 20)
            ),
          ),
          const SizedBox(height: 30),
          RaisedButton(
            onPressed: () {},
            child: const Text(
                'Enabled Button',
                style: TextStyle(fontSize: 20)
            ),
          ),
          const SizedBox(height: 30),
          RaisedButton(
            onPressed: () {},
            textColor: Colors.white,
            padding: const EdgeInsets.all(0.0),
            child: Container(
              decoration: const BoxDecoration(
                gradient: LinearGradient(
                  colors: <Color>[
                    Color(0xFF0D47A1),
                    Color(0xFF1976D2),
                    Color(0xFF42A5F5),
                  ],
                ),
              ),
              padding: const EdgeInsets.all(10.0),
              child: const Text(
                  'Gradient Button',
                  style: TextStyle(fontSize: 20)
              ),
            ),
          ),
        ],
      ),
    );
  }
}