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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
/// Flutter code sample for [OrderedTraversalPolicy].
void main() => runApp(const OrderedTraversalPolicyExampleApp());
class OrderedTraversalPolicyExampleApp extends StatelessWidget {
const OrderedTraversalPolicyExampleApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('OrderedTraversalPolicy Sample')),
body: const Center(
child: OrderedTraversalPolicyExample(),
),
),
);
}
}
class DemoButton extends StatelessWidget {
const DemoButton({
super.key,
required this.name,
this.autofocus = false,
required this.order,
});
final String name;
final bool autofocus;
final double order;
void _handleOnPressed() {
debugPrint('Button $name pressed.');
debugDumpFocusTree();
}
@override
Widget build(BuildContext context) {
return FocusTraversalOrder(
order: NumericFocusOrder(order),
child: TextButton(
autofocus: autofocus,
onPressed: () => _handleOnPressed(),
child: Text(name),
),
);
}
}
class OrderedTraversalPolicyExample extends StatelessWidget {
const OrderedTraversalPolicyExample({super.key});
@override
Widget build(BuildContext context) {
return FocusTraversalGroup(
policy: OrderedTraversalPolicy(),
child: const Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
DemoButton(name: 'Six', order: 6),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
DemoButton(name: 'Five', order: 5),
DemoButton(name: 'Four', order: 4),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
DemoButton(name: 'Three', order: 3),
DemoButton(name: 'Two', order: 2),
DemoButton(name: 'One', order: 1, autofocus: true),
],
),
],
),
);
}
}