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johnpryan/main.dart Secret

Last active Mar 29, 2021
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Navigator 2.0 Pages example
import 'package:flutter/material.dart';
void main() {
runApp(BooksApp());
}
class Book {
final String title;
final String author;
Book(this.title, this.author);
}
class BooksApp extends StatefulWidget {
@override
State<StatefulWidget> createState() => _BooksAppState();
}
class _BooksAppState extends State<BooksApp> {
Book _selectedBook;
List<Book> books = [
Book('Left Hand of Darkness', 'Ursula K. Le Guin'),
Book('Too Like the Lightning', 'Ada Palmer'),
Book('Kindred', 'Octavia E. Butler'),
];
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Books App',
home: Navigator(
pages: [
MaterialPage(
key: ValueKey('BooksListPage'),
child: BooksListScreen(
books: books,
onTapped: _handleBookTapped,
),
),
if (_selectedBook != null) BookDetailsPage(book: _selectedBook)
],
onPopPage: (route, result) {
if (!route.didPop(result)) {
return false;
}
// Update the list of pages by setting _selectedBook to null
setState(() {
_selectedBook = null;
});
return true;
},
),
);
}
void _handleBookTapped(Book book) {
setState(() {
_selectedBook = book;
});
}
}
class BookDetailsPage extends Page {
final Book book;
BookDetailsPage({
this.book,
}) : super(key: ValueKey(book));
Route createRoute(BuildContext context) {
return MaterialPageRoute(
settings: this,
builder: (BuildContext context) {
return BookDetailsScreen(book: book);
},
);
}
}
class BooksListScreen extends StatelessWidget {
final List<Book> books;
final ValueChanged<Book> onTapped;
BooksListScreen({
@required this.books,
@required this.onTapped,
});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: ListView(
children: [
for (var book in books)
ListTile(
title: Text(book.title),
subtitle: Text(book.author),
onTap: () => onTapped(book),
)
],
),
);
}
}
class BookDetailsScreen extends StatelessWidget {
final Book book;
BookDetailsScreen({
@required this.book,
});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
if (book != null) ...[
Text(book.title, style: Theme.of(context).textTheme.headline6),
Text(book.author, style: Theme.of(context).textTheme.subtitle1),
],
],
),
),
);
}
}
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