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Add CupertinoSlider
example (#93633)
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examples/api/lib/cupertino/slider/cupertino_slider.0.dart
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85
examples/api/lib/cupertino/slider/cupertino_slider.0.dart
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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 CupertinoSlider
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import 'package:flutter/cupertino.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 = 'Flutter Code Sample';
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@override
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Widget build(BuildContext context) {
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return const CupertinoApp(
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title: _title,
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home: CupertinoSliderSample(),
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);
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}
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}
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class CupertinoSliderSample extends StatefulWidget {
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const CupertinoSliderSample({Key? key}) : super(key: key);
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@override
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State<CupertinoSliderSample> createState() => _CupertinoSliderSampleState();
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}
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class _CupertinoSliderSampleState extends State<CupertinoSliderSample> {
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double _currentSliderValue = 0.0;
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String? _sliderStatus;
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@override
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Widget build(BuildContext context) {
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return CupertinoPageScaffold(
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child: Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: <Widget>[
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// Display the current slider value.
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Text('$_currentSliderValue'),
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CupertinoSlider(
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key: const Key('slider'),
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value: _currentSliderValue,
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// This allows the slider to jump between divisions.
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// If null, the slide movement is continuous.
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divisions: 5,
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// The maximum slider value
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max: 100,
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activeColor: CupertinoColors.systemPurple,
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thumbColor: CupertinoColors.systemPurple,
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// This is called when sliding is started.
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onChangeStart: (double value) {
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setState(() {
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_sliderStatus = 'Sliding';
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});
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},
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// This is called when sliding has ended.
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onChangeEnd: (double value) {
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setState(() {
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_sliderStatus = 'Finished sliding';
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});
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},
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// This is called when slider value is changed.
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onChanged: (double value) {
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setState(() {
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_currentSliderValue = value;
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});
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},
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),
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Text(
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_sliderStatus ?? '',
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style: CupertinoTheme.of(context).textTheme.textStyle.copyWith(
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fontSize: 12,
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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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// 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/cupertino.dart';
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import 'package:flutter_api_samples/cupertino/slider/cupertino_slider.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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Future<void> _dragSlider(WidgetTester tester, Key sliderKey) {
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final Offset topLeft = tester.getTopLeft(find.byKey(sliderKey));
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const double unit = CupertinoThumbPainter.radius;
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const double delta = 3.0 * unit;
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return tester.dragFrom(topLeft + const Offset(unit, unit), const Offset(delta, 0.0));
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}
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testWidgets('Can change value using CupertinoSlider', (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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// Check for the initial slider value.
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expect(find.text('0.0'), findsOneWidget);
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await _dragSlider(tester, const Key('slider'));
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await tester.pumpAndSettle();
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// Check for the updated slider value.
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expect(find.text('40.0'), findsOneWidget);
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});
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}
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@ -35,6 +35,12 @@ import 'thumb_painter.dart';
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/// that use a slider will listen for the [onChanged] callback and rebuild the
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/// slider with a new [value] to update the visual appearance of the slider.
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///
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/// {@tool dartpad}
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/// This example shows how to show the current slider value as it changes.
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///
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/// ** See code in examples/api/lib/cupertino/slider/cupertino_slider.0.dart **
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/// {@end-tool}
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///
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/// See also:
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///
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/// * <https://developer.apple.com/ios/human-interface-guidelines/controls/sliders/>
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