ex9-6.md

9.6 Using a SizedBox

Example

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  static const String _title = 'SizedBox Widget Demo';
  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: _title,
      home: MyStatelessWidget(),
    );
  }
}

class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('SizedBox Example')),
      body: _buildSizedBoxWidget(),
    );
  }

  Widget _buildSizedBoxWidget() {
    return SingleChildScrollView(
      padding: const EdgeInsets.all(10.0),
      child: Column(
        children: const [
          SizedBox(
            width: 200,
            height: 100,
            child: Card(
                color: Colors.amber, child: Center(child: Text('Developer'))),
          ),
          SizedBox(
            width: 300,
            height: 100,
            child: Card(
                color: Colors.green,
                child: Center(child: Text('Flutter Framework'))),
          ),
          SizedBox(
            width: 400,
            height: 100,
            child: Card(
                color: Colors.blue, child: Center(child: Text('Dart SDK'))),
          ),
        ],
      ),
    );
  }
}