alertdialogandsnackbardemo

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';

void main() => runApp(MyApp());

//root class
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Material App Bar'),
        ),
        body: Home(),
      ),
    );
  }
}

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
        child: Column(
      children: <Widget>[
        
        RaisedButton(
            child: Text('Snackbar'),
            onPressed: () {
              final mySnackBar = SnackBar(
                content: Text('My Snackbar is here!'));
              Scaffold.of(context).showSnackBar(mySnackBar);
            }),

        RaisedButton(
          onPressed: () {
            showDialog(
              context: context,
              // return object of type AlertDialog
              builder: (BuildContext context) => CupertinoAlertDialog(
                title: Column(
                  children: <Widget>[
                    Text("CupertinoAlertDialog"),
                    Icon(
                      Icons.favorite,
                      color: Colors.red,
                    ),
                  ],
                ),
                content: Text("An iOS-style alert dialog."),
                actions: <Widget>[
                  FlatButton(
                      onPressed: () {
                        Navigator.of(context).pop();
                      },
                      child: Text("OK"))
                ],
              ),
            );
          },
          child: Text('Show Cupertino AlertDialog'),
        ),
      ],
    ));
  }
}

//secondary class
// class Home extends StatelessWidget {
//   void function1() {
//     print('OK');
//   }

//   void function2() {
//     print('Cancel');
//   }

//   @override
//   Widget build(BuildContext context) {
//     return Center(
//       child: RaisedButton(
//           child: Text('Show Alert'),
//           onPressed: () {
//             showDialog(
//                 context: context,
//                 builder: (BuildContext context) {
//                   return AlertDialog(
//                     title: Text('My Alert'),
//                     content: Text('Stop You have Error!'),
//                     actions: <Widget>[
//                       RaisedButton(
//                           child: Text('OK'),
//                           onPressed: () {
//                             Navigator.pop(context);
//                             function1();
//                           }),
//                       RaisedButton(
//                           child: Text('Cancel'),
//                           onPressed: () {
//                             Navigator.pop(context);
//                             function2();
//                           }),
//                     ],
//                   );
//                 });
//           }),
//     );
//   }
// }