79 lines
2 KiB
Dart
79 lines
2 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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/// Flutter code sample for [TabBar.onFocusChange].
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void main() => runApp(const TabBarApp());
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class TabBarApp extends StatelessWidget {
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const TabBarApp({super.key});
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@override
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Widget build(BuildContext context) {
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return const MaterialApp(home: TabBarExample());
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}
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}
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class TabBarExample extends StatefulWidget {
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const TabBarExample({super.key});
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@override
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State<TabBarExample> createState() => _TabBarExampleState();
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}
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class _TabBarExampleState extends State<TabBarExample> {
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int? focusedIndex;
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@override
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Widget build(BuildContext context) {
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return DefaultTabController(
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initialIndex: 1,
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length: 3,
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child: Scaffold(
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appBar: AppBar(
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title: const Text('TabBar Sample'),
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bottom: TabBar(
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onFocusChange: (bool value, int index) {
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setState(() {
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focusedIndex = switch (value) {
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true => index,
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false => null,
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};
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});
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},
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tabs: <Widget>[
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Tab(
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icon: Icon(
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Icons.cloud_outlined,
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size: focusedIndex == 0 ? 35 : 25,
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),
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),
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Tab(
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icon: Icon(
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Icons.beach_access_sharp,
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size: focusedIndex == 1 ? 35 : 25,
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),
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),
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Tab(
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icon: Icon(
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Icons.brightness_5_sharp,
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size: focusedIndex == 2 ? 35 : 25,
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),
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),
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],
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),
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),
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body: const TabBarView(
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children: <Widget>[
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Center(child: Text("It's cloudy here")),
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Center(child: Text("It's rainy here")),
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Center(child: Text("It's sunny here")),
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],
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),
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),
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);
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}
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}
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