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RefreshIndicator
: Add an interactive example (#97254)
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// 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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// Flutter code sample for RefreshIndicator
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import 'package:flutter/material.dart';
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void main() => runApp(const MyApp());
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class MyApp extends StatelessWidget {
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const MyApp({Key? key}) : super(key: key);
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static const String _title = 'RefreshIndicator Sample';
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@override
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Widget build(BuildContext context) {
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return const MaterialApp(
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title: _title,
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home: RefreshIndicatorExample(title: _title),
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);
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}
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}
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class RefreshIndicatorExample extends StatefulWidget {
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const RefreshIndicatorExample({Key? key, required this.title}) : super(key: key);
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final String title;
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@override
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State<RefreshIndicatorExample> createState() => _RefreshIndicatorExampleState();
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}
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class _RefreshIndicatorExampleState extends State<RefreshIndicatorExample> {
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final GlobalKey<RefreshIndicatorState> _refreshIndicatorKey =
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GlobalKey<RefreshIndicatorState>();
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text(widget.title),
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),
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body: RefreshIndicator(
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key: _refreshIndicatorKey,
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color: Colors.white,
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backgroundColor: Colors.blue,
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strokeWidth: 4.0,
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onRefresh: () async {
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// Replace this delay with the code to be executed during refresh
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// and return a Future when code finishs execution.
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return Future<void>.delayed(const Duration(seconds: 3));
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},
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// Pull from top to show refresh indicator.
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child: ListView.builder(
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itemCount: 25,
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itemBuilder: (BuildContext context, int index) {
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return ListTile(
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title: Text('Item $index'),
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);
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},
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),
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),
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floatingActionButton: FloatingActionButton.extended(
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onPressed: () {
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// Show refresh indicator programmatically on button tap.
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_refreshIndicatorKey.currentState?.show();
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},
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icon: const Icon(Icons.refresh),
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label: const Text('Show Indicator'),
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),
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);
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}
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}
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@ -0,0 +1,35 @@
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// 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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import 'package:flutter_api_samples/material/refresh_indicator/refresh_indicator.0.dart' as example;
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('Trigger RefreshIndicator - Pull from top', (WidgetTester tester) async {
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await tester.pumpWidget(
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const example.MyApp(),
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);
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await tester.fling(find.text('Item 1'), const Offset(0.0, 300.0), 1000.0);
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await tester.pump();
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await tester.pump(const Duration(seconds: 1));
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await tester.pump(const Duration(seconds: 1));
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expect(tester.getCenter(find.byType(RefreshProgressIndicator)).dy, lessThan(300.0));
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await tester.pumpAndSettle(); // Advance pending time
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});
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testWidgets('Trigger RefreshIndicator - Button', (WidgetTester tester) async {
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await tester.pumpWidget(
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const example.MyApp(),
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);
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await tester.tap(find.byType(FloatingActionButton));
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await tester.pump();
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await tester.pump(const Duration(seconds: 1));
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await tester.pump(const Duration(seconds: 1));
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expect(tester.getCenter(find.byType(RefreshProgressIndicator)).dy, lessThan(300.0));
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await tester.pumpAndSettle(); // Advance pending time
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});
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}
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@ -71,6 +71,12 @@ enum RefreshIndicatorTriggerMode {
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///
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/// The trigger mode is configured by [RefreshIndicator.triggerMode].
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///
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/// {@tool dartpad}
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/// This example shows how [RefreshIndicator] can be triggered in different ways.
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///
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/// ** See code in examples/api/lib/material/refresh_indicator/refresh_indicator.0.dart **
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/// {@end-tool}
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///
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/// ## Troubleshooting
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///
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/// ### Refresh indicator does not show up
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