info.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart' show Clipboard, ClipboardData;

class Info extends StatelessWidget {
  static const String id = 'info';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Informations'),
        actions: [ButtonCoffee()],
      ),
      body: SingleChildScrollView(
        padding: EdgeInsets.all(10.0),
        child: Text(
          textoInfo,
          style: TextStyle(fontSize: 18.0),
        ),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return IconButton(
      icon: Icon(Icons.free_breakfast),
      onPressed: () {
        showDialog(
          context: context,
          builder: (BuildContext context) => Scaffold(
            backgroundColor: Colors.transparent,
            body: Builder(
              builder: (context) => DialogInfo(),
            ),
          ),
        );
      },
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text('Informations sur cette application'),
      content: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Le jeu du pendu est un logiciel libre, sans publicité.'),
          ],
        ),
      ),
      actions: [
        FlatButton(
          child: Text('Fermer'),
          onPressed: () => Navigator.of(context).pop(),
        )
      ],
    );
  }
}

const String textoInfo = '''
LE JEU DU PENDU
''';