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RefreshIndicator
: Add notificationPredicate
example (#103894)
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@ -11,21 +11,16 @@ void main() => runApp(const MyApp());
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class MyApp extends StatelessWidget {
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const MyApp({super.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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home: RefreshIndicatorExample(),
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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({super.key, required this.title});
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final String title;
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const RefreshIndicatorExample({super.key});
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@override
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State<RefreshIndicatorExample> createState() => _RefreshIndicatorExampleState();
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@ -39,7 +34,7 @@ class _RefreshIndicatorExampleState extends State<RefreshIndicatorExample> {
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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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title: const Text('RefreshIndicator Sample'),
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),
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body: RefreshIndicator(
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key: _refreshIndicatorKey,
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@ -0,0 +1,87 @@
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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({super.key});
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@override
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Widget build(BuildContext context) {
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return const MaterialApp(
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home: RefreshIndicatorExample(),
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);
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}
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}
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class RefreshIndicatorExample extends StatelessWidget {
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const RefreshIndicatorExample({super.key});
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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: const Text('RefreshIndicator Sample'),
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),
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body: RefreshIndicator(
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color: Colors.white,
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backgroundColor: Colors.blue,
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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 asynchronous code
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return Future<void>.delayed(const Duration(seconds: 3));
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},
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// This check is used to customize listening to scroll notifications
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// from the widget's children.
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//
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// By default this is set to `notification.depth == 0`, which ensures
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// the only the scroll notifications from the first child are listened to.
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//
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// Here setting `notification.depth == 1` triggers the refresh indicator
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// when overscrolling the nested scroll view.
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notificationPredicate: (ScrollNotification notification) {
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return notification.depth == 1;
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},
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child: SingleChildScrollView(
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child: Column(
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children: <Widget>[
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Container(
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height: 100,
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alignment: Alignment.center,
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color: Colors.pink[100],
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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Text(
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'Pull down here',
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style: Theme.of(context).textTheme.headlineMedium,
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),
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const Text("RefreshIndicator won't trigger"),
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],
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),
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),
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Container(
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color: Colors.green[100],
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child: ListView.builder(
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shrinkWrap: true,
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itemCount: 25,
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itemBuilder: (BuildContext context, int index) {
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return const ListTile(
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title: Text('Pull down here'),
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subtitle: Text('RefreshIndicator will trigger'),
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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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),
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),
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);
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}
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}
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@ -0,0 +1,27 @@
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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.1.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('Pulling from nested scroll view triggers refresh indicator', (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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// Pull from the upper scroll view.
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await tester.fling(find.text('Pull down here').first, const Offset(0.0, 300.0), 1000.0);
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await tester.pump();
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expect(find.byType(RefreshProgressIndicator), findsNothing);
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await tester.pumpAndSettle(); // Advance pending time
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// Pull from the nested scroll view.
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await tester.fling(find.text('Pull down here').at(3), const Offset(0.0, 300.0), 1000.0);
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await tester.pump();
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expect(find.byType(RefreshProgressIndicator), findsOneWidget);
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await tester.pumpAndSettle(); // Advance pending time
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});
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}
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@ -78,6 +78,13 @@ enum RefreshIndicatorTriggerMode {
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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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/// {@tool dartpad}
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/// This example shows how to trigger [RefreshIndicator] in a nested scroll view using
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/// the [notificationPredicate] property.
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///
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/// ** See code in examples/api/lib/material/refresh_indicator/refresh_indicator.1.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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