ex9-2.md

9.2 Using an AppBar

Example

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  final String title = 'Container Widget';
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: title,
      home: Scaffold(
        appBar: MyAppBar(title: title),
        body: const MyCenterWidget(),
      ),
    );
  }
}

class MyAppBar extends StatelessWidget implements PreferredSizeWidget {
  final String title;
  final double sizeAppBar = 200.0;

  const MyAppBar({Key? key, required this.title}) : super(key: key);

  @override
  Size get preferredSize => Size.fromHeight(sizeAppBar);

  @override
  build(BuildContext context) {
    return AppBar(
      title: Text(title),
      backgroundColor: Colors.black,
      elevation: 0.0,
      leading: IconButton(onPressed: () {}, icon: const Icon(Icons.menu)),
      actions: [IconButton(onPressed: () {}, icon: const Icon(Icons.settings))],
    );
  }
}

class MyCenterWidget extends StatelessWidget {
  const MyCenterWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const Center(
      child: Text('Hello Flutter!'),
    );
  }
}