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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.
/// Flutter code sample for [Focus].
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
static const String _title = 'Flutter Code Sample';
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: _title,
home: MyStatefulWidget(),
);
}
}
class MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({super.key});
@override
State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
int focusedChild = 0;
List<Widget> children = <Widget>[];
List<FocusNode> childFocusNodes = <FocusNode>[];
@override
void initState() {
super.initState();
// Add the first child.
_addChild();
}
@override
void dispose() {
for (final FocusNode node in childFocusNodes) {
node.dispose();
}
super.dispose();
}
void _addChild() {
// Calling requestFocus here creates a deferred request for focus, since the
// node is not yet part of the focus tree.
childFocusNodes
.add(FocusNode(debugLabel: 'Child ${children.length}')..requestFocus());
children.add(Padding(
padding: const EdgeInsets.all(2.0),
child: ActionChip(
focusNode: childFocusNodes.last,
label: Text('CHILD ${children.length}'),
onPressed: () {},
),
));
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Wrap(
children: children,
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
setState(() {
focusedChild = children.length;
_addChild();
});
},
child: const Icon(Icons.add),
),
);
}
}