crossAxisAlignment.start vs stretch

crossAxisAlignment.start vs stretch

import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: darkBlue,
      ),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Align(
          child: Container(
            width: 600,
            height: 300,
            color: Colors.pink[200],
            child: SingleChildScrollView(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Placeholder(
                    color: Colors.amber,
                    fallbackHeight: 100,
                  ),
                  Divider(),
                  TextColumn(false),
                  Divider(),
                  Container(
                    decoration: BoxDecoration(color: Colors.amber),
                    child: TextColumn(false),
                  ),
                  Divider(),
                  Container(
                    decoration: BoxDecoration(color: Colors.amber),
                    child: TextColumn(true),
                  ),
                  Divider(),
                  Placeholder(
                    color: Colors.amber,
                    fallbackHeight: 100,
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class TextColumn extends StatelessWidget {
  final bool stretch;

  const TextColumn(this.stretch);

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment:
          stretch ? CrossAxisAlignment.stretch : CrossAxisAlignment.start,
      children: [
        Text(
          'Replenish Wallet to launch Ads',
        ),
        const SizedBox(height: 12),
        Text('The money will be stored in the wallet indefinitely.'
//           ' The system will write off no more than your daily budget for Advertising',
            ),
      ],
    );
  }
}