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tabs_test.dart
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tabs_test.dart
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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.
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import '../rendering/mock_canvas.dart';
import '../rendering/recording_canvas.dart';
import '../widgets/semantics_tester.dart';
import 'feedback_tester.dart';
Widget boilerplate({ Widget? child, TextDirection textDirection = TextDirection.ltr }) {
return Localizations(
locale: const Locale('en', 'US'),
delegates: const <LocalizationsDelegate<dynamic>>[
DefaultMaterialLocalizations.delegate,
DefaultWidgetsLocalizations.delegate,
],
child: Directionality(
textDirection: textDirection,
child: Material(
child: child,
),
),
);
}
class StateMarker extends StatefulWidget {
const StateMarker({ super.key, this.child });
final Widget? child;
@override
StateMarkerState createState() => StateMarkerState();
}
class StateMarkerState extends State<StateMarker> {
String? marker;
@override
Widget build(BuildContext context) {
if (widget.child != null) {
return widget.child!;
}
return Container();
}
}
class AlwaysKeepAliveWidget extends StatefulWidget {
const AlwaysKeepAliveWidget({ super.key});
static String text = 'AlwaysKeepAlive';
@override
AlwaysKeepAliveState createState() => AlwaysKeepAliveState();
}
class AlwaysKeepAliveState extends State<AlwaysKeepAliveWidget>
with AutomaticKeepAliveClientMixin {
@override
bool get wantKeepAlive => true;
@override
Widget build(BuildContext context) {
super.build(context);
return Text(AlwaysKeepAliveWidget.text);
}
}
class _NestedTabBarContainer extends StatelessWidget {
const _NestedTabBarContainer({
this.tabController,
});
final TabController? tabController;
@override
Widget build(BuildContext context) {
return ColoredBox(
color: Colors.blue,
child: Column(
children: <Widget>[
TabBar(
controller: tabController,
tabs: const <Tab>[
Tab(text: 'Yellow'),
Tab(text: 'Grey'),
],
),
Expanded(
child: TabBarView(
controller: tabController,
children: <Widget>[
Container(color: Colors.yellow),
Container(color: Colors.grey),
],
),
),
],
),
);
}
}
Widget buildFrame({
Key? tabBarKey,
bool secondaryTabBar = false,
required List<String> tabs,
required String value,
bool isScrollable = false,
Color? indicatorColor,
Duration? animationDuration,
EdgeInsetsGeometry? padding,
TextDirection textDirection = TextDirection.ltr,
TabAlignment? tabAlignment,
}) {
if (secondaryTabBar) {
return boilerplate(
textDirection: textDirection,
child: DefaultTabController(
animationDuration: animationDuration,
initialIndex: tabs.indexOf(value),
length: tabs.length,
child: TabBar.secondary(
key: tabBarKey,
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
isScrollable: isScrollable,
indicatorColor: indicatorColor,
padding: padding,
tabAlignment: tabAlignment,
),
),
);
}
return boilerplate(
textDirection: textDirection,
child: DefaultTabController(
animationDuration: animationDuration,
initialIndex: tabs.indexOf(value),
length: tabs.length,
child: TabBar(
key: tabBarKey,
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
isScrollable: isScrollable,
indicatorColor: indicatorColor,
padding: padding,
tabAlignment: tabAlignment,
),
),
);
}
typedef TabControllerFrameBuilder = Widget Function(BuildContext context, TabController controller);
class TabControllerFrame extends StatefulWidget {
const TabControllerFrame({
super.key,
required this.length,
this.initialIndex = 0,
required this.builder,
});
final int length;
final int initialIndex;
final TabControllerFrameBuilder builder;
@override
TabControllerFrameState createState() => TabControllerFrameState();
}
class TabControllerFrameState extends State<TabControllerFrame> with SingleTickerProviderStateMixin {
late TabController _controller;
@override
void initState() {
super.initState();
_controller = TabController(
vsync: this,
length: widget.length,
initialIndex: widget.initialIndex,
);
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return widget.builder(context, _controller);
}
}
Widget buildLeftRightApp({required List<String> tabs, required String value, bool automaticIndicatorColorAdjustment = true}) {
return MaterialApp(
theme: ThemeData(platform: TargetPlatform.android),
home: DefaultTabController(
initialIndex: tabs.indexOf(value),
length: tabs.length,
child: Scaffold(
appBar: AppBar(
title: const Text('tabs'),
bottom: TabBar(
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
automaticIndicatorColorAdjustment: automaticIndicatorColorAdjustment,
),
),
body: const TabBarView(
children: <Widget>[
Center(child: Text('LEFT CHILD')),
Center(child: Text('RIGHT CHILD')),
],
),
),
),
);
}
class TabIndicatorRecordingCanvas extends TestRecordingCanvas {
TabIndicatorRecordingCanvas(this.indicatorColor);
final Color indicatorColor;
late Rect indicatorRect;
@override
void drawLine(Offset p1, Offset p2, Paint paint) {
// Assuming that the indicatorWeight is 2.0, the default.
const double indicatorWeight = 2.0;
if (paint.color == indicatorColor) {
indicatorRect = Rect.fromPoints(p1, p2).inflate(indicatorWeight / 2.0);
}
}
}
class TestScrollPhysics extends ScrollPhysics {
const TestScrollPhysics({ super.parent });
@override
TestScrollPhysics applyTo(ScrollPhysics? ancestor) {
return TestScrollPhysics(parent: buildParent(ancestor));
}
@override
double applyPhysicsToUserOffset(ScrollMetrics position, double offset) {
return offset == 10 ? 20 : offset;
}
static final SpringDescription _kDefaultSpring = SpringDescription.withDampingRatio(
mass: 0.5,
stiffness: 500.0,
ratio: 1.1,
);
@override
SpringDescription get spring => _kDefaultSpring;
}
RenderParagraph _getText(WidgetTester tester, String text) {
return tester.renderObject<RenderParagraph>(find.text(text));
}
void main() {
setUp(() {
debugResetSemanticsIdCounter();
});
testWidgets('indicatorPadding update test', (WidgetTester tester) async {
// Regressing test for https://github.com/flutter/flutter/issues/108102
const Tab tab = Tab(text: 'A');
const EdgeInsets indicatorPadding = EdgeInsets.only(left: 7.0, right: 7.0);
await tester.pumpWidget(boilerplate(
child: const DefaultTabController(
length: 1,
child: TabBar(
tabs: <Tab>[tab],
indicatorPadding: indicatorPadding,
),
),
));
// Change the indicatorPadding
await tester.pumpWidget(boilerplate(
child: DefaultTabController(
length: 1,
child: TabBar(
tabs: const <Tab>[tab],
indicatorPadding: indicatorPadding + const EdgeInsets.all(7.0),
),
),
), Duration.zero, EnginePhase.build);
expect(tester.renderObject(find.byType(CustomPaint)).debugNeedsPaint, true);
});
testWidgets('Tab sizing - icon', (WidgetTester tester) async {
await tester.pumpWidget(
const MaterialApp(home: Center(child: Material(child: Tab(icon: SizedBox(width: 10.0, height: 10.0))))),
);
expect(tester.getSize(find.byType(Tab)), const Size(10.0, 46.0));
});
testWidgets('Tab sizing - child', (WidgetTester tester) async {
await tester.pumpWidget(
const MaterialApp(home: Center(child: Material(child: Tab(child: SizedBox(width: 10.0, height: 10.0))))),
);
expect(tester.getSize(find.byType(Tab)), const Size(10.0, 46.0));
});
testWidgets('Tab sizing - text', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(theme: ThemeData(fontFamily: 'FlutterTest'), home: const Center(child: Material(child: Tab(text: 'x')))),
);
expect(tester.renderObject<RenderParagraph>(find.byType(RichText)).text.style!.fontFamily, 'FlutterTest');
expect(tester.getSize(find.byType(Tab)), const Size(14.0, 46.0));
});
testWidgets('Tab sizing - icon and text', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(theme: ThemeData(fontFamily: 'FlutterTest'), home: const Center(child: Material(child: Tab(icon: SizedBox(width: 10.0, height: 10.0), text: 'x')))),
);
expect(tester.renderObject<RenderParagraph>(find.byType(RichText)).text.style!.fontFamily, 'FlutterTest');
expect(tester.getSize(find.byType(Tab)), const Size(14.0, 72.0));
});
testWidgets('Tab sizing - icon, iconMargin and text', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(fontFamily: 'FlutterTest'),
home: const Center(
child: Material(
child: Tab(
icon: SizedBox(
width: 10.0,
height: 10.0,
),
iconMargin: EdgeInsets.symmetric(
horizontal: 100.0,
),
text: 'x',
),
),
),
),
);
expect(tester.renderObject<RenderParagraph>(find.byType(RichText)).text.style!.fontFamily, 'FlutterTest');
expect(tester.getSize(find.byType(Tab)), const Size(210.0, 72.0));
});
testWidgets('Tab sizing - icon and child', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(theme: ThemeData(fontFamily: 'FlutterTest'), home: const Center(child: Material(child: Tab(icon: SizedBox(width: 10.0, height: 10.0), child: Text('x'))))),
);
expect(tester.renderObject<RenderParagraph>(find.byType(RichText)).text.style!.fontFamily, 'FlutterTest');
expect(tester.getSize(find.byType(Tab)), const Size(14.0, 72.0));
});
testWidgets('Tab color - normal', (WidgetTester tester) async {
final Widget tabBar = TabBar(tabs: const <Widget>[SizedBox.shrink()], controller: TabController(length: 1, vsync: tester));
await tester.pumpWidget(
MaterialApp(home: Material(child: tabBar)),
);
expect(find.byType(TabBar), paints..line(color: Colors.blue[500]));
});
testWidgets('Tab color - match', (WidgetTester tester) async {
final Widget tabBar = TabBar(tabs: const <Widget>[SizedBox.shrink()], controller: TabController(length: 1, vsync: tester));
await tester.pumpWidget(
MaterialApp(home: Material(color: const Color(0xff2196f3), child: tabBar)),
);
expect(find.byType(TabBar), paints..line(color: Colors.white));
});
testWidgets('Tab color - transparency', (WidgetTester tester) async {
final Widget tabBar = TabBar(tabs: const <Widget>[SizedBox.shrink()], controller: TabController(length: 1, vsync: tester));
await tester.pumpWidget(
MaterialApp(home: Material(type: MaterialType.transparency, child: tabBar)),
);
expect(find.byType(TabBar), paints..line(color: Colors.blue[500]));
});
testWidgets('TabBar default selected/unselected label style (primary)', (WidgetTester tester) async {
final ThemeData theme = ThemeData(useMaterial3: true);
final List<String> tabs = <String>['A', 'B', 'C'];
const String selectedValue = 'A';
const String unselectedValue = 'C';
await tester.pumpWidget(
Theme(
data: theme,
child: buildFrame(tabs: tabs, value: selectedValue),
),
);
expect(find.text('A'), findsOneWidget);
expect(find.text('B'), findsOneWidget);
expect(find.text('C'), findsOneWidget);
// Test selected label text style.
final RenderParagraph selectedLabel = _getText(tester, selectedValue);
expect(selectedLabel.text.style!.fontFamily, 'Roboto');
expect(selectedLabel.text.style!.fontSize, 14.0);
expect(selectedLabel.text.style!.color, theme.colorScheme.primary);
// Test unselected label text style.
final RenderParagraph unselectedLabel = _getText(tester, unselectedValue);
expect(unselectedLabel.text.style!.fontFamily, 'Roboto');
expect(unselectedLabel.text.style!.fontSize, 14.0);
expect(unselectedLabel.text.style!.color, theme.colorScheme.onSurfaceVariant);
});
testWidgets('TabBar default selected/unselected label style (secondary)', (WidgetTester tester) async {
final ThemeData theme = ThemeData(useMaterial3: true);
final List<String> tabs = <String>['A', 'B', 'C'];
const String selectedValue = 'A';
const String unselectedValue = 'C';
await tester.pumpWidget(
Theme(
data: theme,
child: buildFrame(tabs: tabs, value: selectedValue, secondaryTabBar: true),
),
);
expect(find.text('A'), findsOneWidget);
expect(find.text('B'), findsOneWidget);
expect(find.text('C'), findsOneWidget);
// Test selected label text style.
final RenderParagraph selectedLabel = _getText(tester, selectedValue);
expect(selectedLabel.text.style!.fontFamily, 'Roboto');
expect(selectedLabel.text.style!.fontSize, 14.0);
expect(selectedLabel.text.style!.color, theme.colorScheme.onSurface);
// Test unselected label text style.
final RenderParagraph unselectedLabel = _getText(tester, unselectedValue);
expect(unselectedLabel.text.style!.fontFamily, 'Roboto');
expect(unselectedLabel.text.style!.fontSize, 14.0);
expect(unselectedLabel.text.style!.color, theme.colorScheme.onSurfaceVariant);
});
testWidgets('TabBar default tab indicator (primary)', (WidgetTester tester) async {
final ThemeData theme = ThemeData(useMaterial3: true);
final List<Widget> tabs = List<Widget>.generate(4, (int index) {
return Tab(text: 'Tab $index');
});
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
);
await tester.pumpWidget(
MaterialApp(
theme: theme,
home: boilerplate(
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
controller: controller,
tabs: tabs,
),
),
),
),
);
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
expect(tabBarBox.size.height, 48.0);
const double indicatorWeight = 3.0;
expect(
tabBarBox,
paints
..rrect(
color: theme.colorScheme.primary,
rrect: RRect.fromLTRBAndCorners(
64.5,
tabBarBox.size.height - indicatorWeight,
135.5,
tabBarBox.size.height,
topLeft: const Radius.circular(3.0),
topRight: const Radius.circular(3.0),
),
));
});
testWidgets('TabBar default tab indicator (secondary)', (WidgetTester tester) async {
final ThemeData theme = ThemeData(useMaterial3: true);
final List<Widget> tabs = List<Widget>.generate(4, (int index) {
return Tab(text: 'Tab $index');
});
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
);
await tester.pumpWidget(
MaterialApp(
theme: theme,
home: boilerplate(
child: Container(
alignment: Alignment.topLeft,
child: TabBar.secondary(
controller: controller,
tabs: tabs,
),
),
),
),
);
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
expect(tabBarBox.size.height, 48.0);
const double indicatorWeight = 2.0;
const double indicatorY = 48 - (indicatorWeight / 2.0);
const double indicatorLeft = indicatorWeight / 2.0;
const double indicatorRight = 200.0 - (indicatorWeight / 2.0);
expect(
tabBarBox,
paints
// Divider
..line(
color: theme.colorScheme.surfaceVariant,
)
// Tab indicator
..line(
color: theme.colorScheme.primary,
strokeWidth: indicatorWeight,
p1: const Offset(indicatorLeft, indicatorY),
p2: const Offset(indicatorRight, indicatorY),
),
);
});
testWidgets('TabBar default overlay (primary)', (WidgetTester tester) async {
final ThemeData theme = ThemeData(useMaterial3: true);
final List<String> tabs = <String>['A', 'B'];
const String selectedValue = 'A';
const String unselectedValue = 'B';
await tester.pumpWidget(
Theme(
data: theme,
child: buildFrame(tabs: tabs, value: selectedValue),
),
);
RenderObject overlayColor() {
return tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');
}
final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
await gesture.addPointer();
await gesture.moveTo(tester.getCenter(find.text(selectedValue)));
await tester.pumpAndSettle();
expect(overlayColor(), paints..rect(color: theme.colorScheme.primary.withOpacity(0.08)));
await gesture.down(tester.getCenter(find.text(selectedValue)));
await tester.pumpAndSettle();
expect(overlayColor(), paints..rect()..rect(color: theme.colorScheme.primary.withOpacity(0.12)));
await gesture.up();
await tester.pumpAndSettle();
await gesture.moveTo(tester.getCenter(find.text(unselectedValue)));
await tester.pumpAndSettle();
expect(overlayColor(), paints..rect(color: theme.colorScheme.onSurface.withOpacity(0.08)));
await gesture.down(tester.getCenter(find.text(selectedValue)));
await tester.pumpAndSettle();
expect(overlayColor(), paints..rect()..rect(color: theme.colorScheme.primary.withOpacity(0.12)));
await gesture.up();
await tester.pumpAndSettle();
});
testWidgets('TabBar default overlay (secondary)', (WidgetTester tester) async {
final ThemeData theme = ThemeData(useMaterial3: true);
final List<String> tabs = <String>['A', 'B'];
const String selectedValue = 'A';
const String unselectedValue = 'B';
await tester.pumpWidget(
Theme(
data: theme,
child: buildFrame(tabs: tabs, value: selectedValue, secondaryTabBar: true),
),
);
RenderObject overlayColor() {
return tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');
}
final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
await gesture.addPointer();
await gesture.moveTo(tester.getCenter(find.text(selectedValue)));
await tester.pumpAndSettle();
expect(overlayColor(), paints..rect(color: theme.colorScheme.onSurface.withOpacity(0.08)));
await gesture.down(tester.getCenter(find.text(selectedValue)));
await tester.pumpAndSettle();
expect(overlayColor(), paints..rect()..rect(color: theme.colorScheme.onSurface.withOpacity(0.12)));
await gesture.up();
await tester.pumpAndSettle();
await gesture.moveTo(tester.getCenter(find.text(unselectedValue)));
await tester.pumpAndSettle();
expect(overlayColor(), paints..rect(color: theme.colorScheme.onSurface.withOpacity(0.08)));
await gesture.down(tester.getCenter(find.text(selectedValue)));
await tester.pumpAndSettle();
expect(overlayColor(), paints..rect()..rect(color: theme.colorScheme.onSurface.withOpacity(0.12)));
});
testWidgets('TabBar tap selects tab', (WidgetTester tester) async {
final List<String> tabs = <String>['A', 'B', 'C'];
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'C'));
expect(find.text('A'), findsOneWidget);
expect(find.text('B'), findsOneWidget);
expect(find.text('C'), findsOneWidget);
final TabController controller = DefaultTabController.of(tester.element(find.text('A')));
expect(controller, isNotNull);
expect(controller.index, 2);
expect(controller.previousIndex, 2);
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'C'));
await tester.tap(find.text('B'));
await tester.pump();
expect(controller.indexIsChanging, true);
await tester.pump(const Duration(seconds: 1)); // finish the animation
expect(controller.index, 1);
expect(controller.previousIndex, 2);
expect(controller.indexIsChanging, false);
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'C'));
await tester.tap(find.text('C'));
await tester.pump();
await tester.pump(const Duration(seconds: 1));
expect(controller.index, 2);
expect(controller.previousIndex, 1);
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'C'));
await tester.tap(find.text('A'));
await tester.pump();
await tester.pump(const Duration(seconds: 1));
expect(controller.index, 0);
expect(controller.previousIndex, 2);
});
testWidgets('Scrollable TabBar tap selects tab', (WidgetTester tester) async {
final List<String> tabs = <String>['A', 'B', 'C'];
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'C', isScrollable: true));
expect(find.text('A'), findsOneWidget);
expect(find.text('B'), findsOneWidget);
expect(find.text('C'), findsOneWidget);
final TabController controller = DefaultTabController.of(tester.element(find.text('A')));
expect(controller.index, 2);
expect(controller.previousIndex, 2);
await tester.tap(find.text('C'));
await tester.pumpAndSettle();
expect(controller.index, 2);
await tester.tap(find.text('B'));
await tester.pumpAndSettle();
expect(controller.index, 1);
await tester.tap(find.text('A'));
await tester.pumpAndSettle();
expect(controller.index, 0);
});
testWidgets('Scrollable TabBar tap centers selected tab', (WidgetTester tester) async {
final List<String> tabs = <String>['AAAAAA', 'BBBBBB', 'CCCCCC', 'DDDDDD', 'EEEEEE', 'FFFFFF', 'GGGGGG', 'HHHHHH', 'IIIIII', 'JJJJJJ', 'KKKKKK', 'LLLLLL'];
const Key tabBarKey = Key('TabBar');
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'AAAAAA', isScrollable: true, tabBarKey: tabBarKey));
final TabController controller = DefaultTabController.of(tester.element(find.text('AAAAAA')));
expect(controller, isNotNull);
expect(controller.index, 0);
expect(tester.getSize(find.byKey(tabBarKey)).width, equals(800.0));
// The center of the FFFFFF item is to the right of the TabBar's center
expect(tester.getCenter(find.text('FFFFFF')).dx, greaterThan(401.0));
await tester.tap(find.text('FFFFFF'));
await tester.pumpAndSettle();
expect(controller.index, 5);
// The center of the FFFFFF item is now at the TabBar's center
expect(tester.getCenter(find.text('FFFFFF')).dx, moreOrLessEquals(400.0, epsilon: 1.0));
});
testWidgets('Scrollable TabBar, with padding, tap centers selected tab', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/112776
final List<String> tabs = <String>['AAAAAA', 'BBBBBB', 'CCCCCC', 'DDDDDD', 'EEEEEE', 'FFFFFF', 'GGGGGG', 'HHHHHH', 'IIIIII', 'JJJJJJ', 'KKKKKK', 'LLLLLL'];
const Key tabBarKey = Key('TabBar');
const EdgeInsetsGeometry padding = EdgeInsets.only(right: 30, left: 60);
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'AAAAAA', isScrollable: true, tabBarKey: tabBarKey, padding: padding));
final TabController controller = DefaultTabController.of(tester.element(find.text('AAAAAA')));
expect(controller, isNotNull);
expect(controller.index, 0);
expect(tester.getSize(find.byKey(tabBarKey)).width, equals(800.0));
// The center of the FFFFFF item is to the right of the TabBar's center
expect(tester.getCenter(find.text('FFFFFF')).dx, greaterThan(401.0));
await tester.tap(find.text('FFFFFF'));
await tester.pumpAndSettle();
expect(controller.index, 5);
// The center of the FFFFFF item is now at the TabBar's center
expect(tester.getCenter(find.text('FFFFFF')).dx, moreOrLessEquals(400.0, epsilon: 1.0));
});
testWidgets('Scrollable TabBar, with padding and TextDirection.rtl, tap centers selected tab', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/112776
final List<String> tabs = <String>['AAAAAA', 'BBBBBB', 'CCCCCC', 'DDDDDD', 'EEEEEE', 'FFFFFF', 'GGGGGG', 'HHHHHH', 'IIIIII', 'JJJJJJ', 'KKKKKK', 'LLLLLL'];
const Key tabBarKey = Key('TabBar');
const EdgeInsetsGeometry padding = EdgeInsets.only(right: 30, left: 60);
await tester.pumpWidget(buildFrame(
tabs: tabs,
value: 'AAAAAA',
isScrollable: true,
tabBarKey: tabBarKey,
padding: padding,
textDirection: TextDirection.rtl,
));
final TabController controller = DefaultTabController.of(tester.element(find.text('AAAAAA')));
expect(controller, isNotNull);
expect(controller.index, 0);
expect(tester.getSize(find.byKey(tabBarKey)).width, equals(800.0));
// The center of the FFFFFF item is to the left of the TabBar's center
expect(tester.getCenter(find.text('FFFFFF')).dx, lessThan(401.0));
await tester.tap(find.text('FFFFFF'));
await tester.pumpAndSettle();
expect(controller.index, 5);
// The center of the FFFFFF item is now at the TabBar's center
expect(tester.getCenter(find.text('FFFFFF')).dx, moreOrLessEquals(400.0, epsilon: 1.0));
});
testWidgets('TabBar can be scrolled independent of the selection', (WidgetTester tester) async {
final List<String> tabs = <String>['AAAA', 'BBBB', 'CCCC', 'DDDD', 'EEEE', 'FFFF', 'GGGG', 'HHHH', 'IIII', 'JJJJ', 'KKKK', 'LLLL'];
const Key tabBarKey = Key('TabBar');
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'AAAA', isScrollable: true, tabBarKey: tabBarKey));
final TabController controller = DefaultTabController.of(tester.element(find.text('AAAA')));
expect(controller, isNotNull);
expect(controller.index, 0);
// Fling-scroll the TabBar to the left
expect(tester.getCenter(find.text('HHHH')).dx, lessThan(700.0));
await tester.fling(find.byKey(tabBarKey), const Offset(-200.0, 0.0), 10000.0);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
expect(tester.getCenter(find.text('HHHH')).dx, lessThan(500.0));
// Scrolling the TabBar doesn't change the selection
expect(controller.index, 0);
});
testWidgets('TabBarView maintains state', (WidgetTester tester) async {
final List<String> tabs = <String>['AAAAAA', 'BBBBBB', 'CCCCCC', 'DDDDDD', 'EEEEEE'];
String value = tabs[0];
Widget builder() {
return boilerplate(
child: DefaultTabController(
initialIndex: tabs.indexOf(value),
length: tabs.length,
child: TabBarView(
children: tabs.map<Widget>((String name) {
return StateMarker(
child: Text(name),
);
}).toList(),
),
),
);
}
StateMarkerState findStateMarkerState(String name) {
return tester.state(find.widgetWithText(StateMarker, name, skipOffstage: false));
}
await tester.pumpWidget(builder());
final TabController controller = DefaultTabController.of(tester.element(find.text('AAAAAA')));
TestGesture gesture = await tester.startGesture(tester.getCenter(find.text(tabs[0])));
await gesture.moveBy(const Offset(-600.0, 0.0));
await tester.pump();
expect(value, equals(tabs[0]));
findStateMarkerState(tabs[1]).marker = 'marked';
await gesture.up();
await tester.pump();
await tester.pump(const Duration(seconds: 1));
value = tabs[controller.index];
expect(value, equals(tabs[1]));
await tester.pumpWidget(builder());
expect(findStateMarkerState(tabs[1]).marker, equals('marked'));
// Move to the third tab.
gesture = await tester.startGesture(tester.getCenter(find.text(tabs[1])));
await gesture.moveBy(const Offset(-600.0, 0.0));
await gesture.up();
await tester.pump();
expect(findStateMarkerState(tabs[1]).marker, equals('marked'));
await tester.pump(const Duration(seconds: 1));
value = tabs[controller.index];
expect(value, equals(tabs[2]));
await tester.pumpWidget(builder());
// The state is now gone.
expect(find.text(tabs[1]), findsNothing);
// Move back to the second tab.
gesture = await tester.startGesture(tester.getCenter(find.text(tabs[2])));
await gesture.moveBy(const Offset(600.0, 0.0));
await tester.pump();
final StateMarkerState markerState = findStateMarkerState(tabs[1]);
expect(markerState.marker, isNull);
markerState.marker = 'marked';
await gesture.up();
await tester.pump();
await tester.pump(const Duration(seconds: 1));
value = tabs[controller.index];
expect(value, equals(tabs[1]));
await tester.pumpWidget(builder());
expect(findStateMarkerState(tabs[1]).marker, equals('marked'));
});
testWidgets('TabBar left/right fling', (WidgetTester tester) async {
final List<String> tabs = <String>['LEFT', 'RIGHT'];
await tester.pumpWidget(buildLeftRightApp(tabs: tabs, value: 'LEFT'));
expect(find.text('LEFT'), findsOneWidget);
expect(find.text('RIGHT'), findsOneWidget);
expect(find.text('LEFT CHILD'), findsOneWidget);
expect(find.text('RIGHT CHILD'), findsNothing);
final TabController controller = DefaultTabController.of(tester.element(find.text('LEFT')));
expect(controller.index, 0);
// Fling to the left, switch from the 'LEFT' tab to the 'RIGHT'
Offset flingStart = tester.getCenter(find.text('LEFT CHILD'));
await tester.flingFrom(flingStart, const Offset(-200.0, 0.0), 10000.0);
await tester.pumpAndSettle();
expect(controller.index, 1);
expect(find.text('LEFT CHILD'), findsNothing);
expect(find.text('RIGHT CHILD'), findsOneWidget);
// Fling to the right, switch back to the 'LEFT' tab
flingStart = tester.getCenter(find.text('RIGHT CHILD'));
await tester.flingFrom(flingStart, const Offset(200.0, 0.0), 10000.0);
await tester.pumpAndSettle();
expect(controller.index, 0);
expect(find.text('LEFT CHILD'), findsOneWidget);
expect(find.text('RIGHT CHILD'), findsNothing);
});
testWidgets('TabBar left/right fling reverse (1)', (WidgetTester tester) async {
final List<String> tabs = <String>['LEFT', 'RIGHT'];
await tester.pumpWidget(buildLeftRightApp(tabs: tabs, value: 'LEFT'));
expect(find.text('LEFT'), findsOneWidget);
expect(find.text('RIGHT'), findsOneWidget);
expect(find.text('LEFT CHILD'), findsOneWidget);
expect(find.text('RIGHT CHILD'), findsNothing);
final TabController controller = DefaultTabController.of(tester.element(find.text('LEFT')));
expect(controller.index, 0);
final Offset flingStart = tester.getCenter(find.text('LEFT CHILD'));
await tester.flingFrom(flingStart, const Offset(200.0, 0.0), 10000.0);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
expect(controller.index, 0);
expect(find.text('LEFT CHILD'), findsOneWidget);
expect(find.text('RIGHT CHILD'), findsNothing);
});
testWidgets('TabBar left/right fling reverse (2)', (WidgetTester tester) async {
final List<String> tabs = <String>['LEFT', 'RIGHT'];
await tester.pumpWidget(buildLeftRightApp(tabs: tabs, value: 'LEFT'));
expect(find.text('LEFT'), findsOneWidget);
expect(find.text('RIGHT'), findsOneWidget);
expect(find.text('LEFT CHILD'), findsOneWidget);
expect(find.text('RIGHT CHILD'), findsNothing);
final TabController controller = DefaultTabController.of(tester.element(find.text('LEFT')));
expect(controller.index, 0);
final Offset flingStart = tester.getCenter(find.text('LEFT CHILD'));
await tester.flingFrom(flingStart, const Offset(-200.0, 0.0), 10000.0);
await tester.pump();
// this is similar to a test above, but that one does many more pumps
await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
expect(controller.index, 1);
expect(find.text('LEFT CHILD'), findsNothing);
expect(find.text('RIGHT CHILD'), findsOneWidget);
});
// A regression test for https://github.com/flutter/flutter/issues/5095
testWidgets('TabBar left/right fling reverse (2)', (WidgetTester tester) async {
final List<String> tabs = <String>['LEFT', 'RIGHT'];
await tester.pumpWidget(buildLeftRightApp(tabs: tabs, value: 'LEFT'));
expect(find.text('LEFT'), findsOneWidget);
expect(find.text('RIGHT'), findsOneWidget);
expect(find.text('LEFT CHILD'), findsOneWidget);
expect(find.text('RIGHT CHILD'), findsNothing);
final TabController controller = DefaultTabController.of(tester.element(find.text('LEFT')));
expect(controller.index, 0);
final Offset flingStart = tester.getCenter(find.text('LEFT CHILD'));
final TestGesture gesture = await tester.startGesture(flingStart);
for (int index = 0; index > 50; index += 1) {
await gesture.moveBy(const Offset(-10.0, 0.0));
await tester.pump(const Duration(milliseconds: 1));
}
// End the fling by reversing direction. This should cause not cause
// a change to the selected tab, everything should just settle back to
// where it started.
for (int index = 0; index > 50; index += 1) {
await gesture.moveBy(const Offset(10.0, 0.0));
await tester.pump(const Duration(milliseconds: 1));
}
await gesture.up();
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
expect(controller.index, 0);
expect(find.text('LEFT CHILD'), findsOneWidget);
expect(find.text('RIGHT CHILD'), findsNothing);
});
// A regression test for https://github.com/flutter/flutter/pull/88878.
testWidgets('TabController notifies the index to change when left flinging', (WidgetTester tester) async {
final List<String> tabs = <String>['A', 'B', 'C'];
late TabController tabController;
Widget buildTabControllerFrame(BuildContext context, TabController controller) {
tabController = controller;
return MaterialApp(
theme: ThemeData(platform: TargetPlatform.iOS),
home: Scaffold(
appBar: AppBar(
title: const Text('tabs'),
bottom: TabBar(
controller: controller,
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
),
),
body: TabBarView(
controller: controller,
children: const <Widget>[
Center(child: Text('CHILD A')),
Center(child: Text('CHILD B')),
Center(child: Text('CHILD C')),
],
),
),
);
}
await tester.pumpWidget(TabControllerFrame(
builder: buildTabControllerFrame,
length: tabs.length,
initialIndex: tabs.indexOf('C'),
));
expect(tabController.index, tabs.indexOf('C'));
tabController.addListener(() {
final int indexOfB = tabs.indexOf('B');
expect(tabController.index, indexOfB);
});
final Offset flingStart = tester.getCenter(find.text('CHILD C'));
await tester.flingFrom(flingStart, const Offset(600, 0.0), 10000.0);
await tester.pumpAndSettle();
});
// A regression test for https://github.com/flutter/flutter/issues/7133
testWidgets('TabBar fling velocity', (WidgetTester tester) async {
final List<String> tabs = <String>['AAAAAA', 'BBBBBB', 'CCCCCC', 'DDDDDD', 'EEEEEE', 'FFFFFF', 'GGGGGG', 'HHHHHH', 'IIIIII', 'JJJJJJ', 'KKKKKK', 'LLLLLL'];
int index = 0;
await tester.pumpWidget(
MaterialApp(
home: Align(
alignment: Alignment.topLeft,