Flutter demo #6, AlertDialog

demo6.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(home: MyApp()));
}

void pn(num n) => print(n);

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    Widget scaffold = Scaffold(
      appBar: AppBar(title: Text("My App")),
      body: Container(
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                "Press button to alert!",
                style: TextStyle(
                  color: Colors.red,
                  fontSize: 30,
                ),
              ),
              RaisedButton(
                onPressed: () {
                  alert(context);
                },
                color: Colors.blue,
                textColor: Colors.white,
                child: Text("Alert!"),
              ),
            ],
          ),
        ),
      ),
    );

    return scaffold;
  }

  void alert(BuildContext context) {
    AlertDialog dialog = AlertDialog(
      backgroundColor: Colors.yellow,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(15)),
      ),
      content: Row(
        children: <Widget>[
          Icon(
            Icons.warning,
            color: Colors.red,
            size: 30,
          ),
          Padding(padding: EdgeInsets.only(right: 10)),
          Text(
            "This is a dialog.",
            style: TextStyle(
              color: Colors.red,
              fontSize: 30,
            ),
          ),
        ],
      ),
      actions: <Widget>[
        FlatButton(
          onPressed: () {
            Navigator.pop(context, true);
          },
          child: Text(
            "CLOSE",
            style: TextStyle(color: Colors.black),
          ),
        ),
      ],
    );

    showDialog(
      barrierDismissible: false,
      context: context,
      builder: (BuildContext context) => dialog,
    );

    //print("in alert()");
  }
}