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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_test/flutter_test.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/physics.dart';
import '../flutter_test_alternative.dart' show Fake;
import '../rendering/mock_canvas.dart';
import '../rendering/recording_canvas.dart';
import '../widgets/semantics_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({ Key? key, this.child }) : super(key: key);
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({ Key? key}) : super(key: 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 Container(
color: Colors.blue,
child: Column(
children: <Widget>[
TabBar(
controller: tabController,
tabs: const <Tab>[
Tab(text: 'Yellow'),
Tab(text: 'Grey'),
],
),
Expanded(
flex: 1,
child: TabBarView(
controller: tabController,
children: <Widget>[
Container(color: Colors.yellow),
Container(color: Colors.grey),
],
),
),
],
),
);
}
}
Widget buildFrame({
Key? tabBarKey,
required List<String> tabs,
required String value,
bool isScrollable = false,
Color? indicatorColor,
}) {
return boilerplate(
child: DefaultTabController(
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,
),
),
);
}
typedef TabControllerFrameBuilder = Widget Function(BuildContext context, TabController controller);
class TabControllerFrame extends StatefulWidget {
const TabControllerFrame({
Key? key,
required this.length,
this.initialIndex = 0,
required this.builder,
}) : super(key: key);
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 }) {
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(),
),
),
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({ ScrollPhysics? parent }) : super(parent: 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;
}
void main() {
setUp(() {
debugResetSemanticsIdCounter();
});
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: 'Ahem'), home: const Center(child: Material(child: Tab(text: 'x')))),
);
expect(tester.renderObject<RenderParagraph>(find.byType(RichText)).text.style!.fontFamily, 'Ahem');
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: 'Ahem'), 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, 'Ahem');
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: 'Ahem'),
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, 'Ahem');
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: 'Ahem'), 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, 'Ahem');
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 tap selects tab', (WidgetTester tester) async {
final List<String> tabs = <String>['A', 'B', 'C'];
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'C', isScrollable: false));
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', isScrollable: false));
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', isScrollable: false));
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', isScrollable: false));
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('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
// 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/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,
child: SizedBox(
width: 300.0,
height: 200.0,
child: DefaultTabController(
length: tabs.length,
child: Scaffold(
appBar: AppBar(
title: const Text('tabs'),
bottom: TabBar(
isScrollable: true,
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
),
),
body: TabBarView(
children: tabs.map<Widget>((String name) => Text('${index++}')).toList(),
),
),
),
),
),
),
);
// After a small slow fling to the left, we expect the second item to still be visible.
await tester.fling(find.text('AAAAAA'), const Offset(-25.0, 0.0), 100.0);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
final RenderBox box = tester.renderObject(find.text('BBBBBB'));
expect(box.localToGlobal(Offset.zero).dx, greaterThan(0.0));
});
testWidgets('TabController change notification', (WidgetTester tester) async {
final List<String> tabs = <String>['LEFT', 'RIGHT'];
await tester.pumpWidget(buildLeftRightApp(tabs: tabs, value: 'LEFT'));
final TabController controller = DefaultTabController.of(tester.element(find.text('LEFT')))!;
expect(controller, isNotNull);
expect(controller.index, 0);
late String value;
controller.addListener(() {
value = tabs[controller.index];
});
await tester.tap(find.text('RIGHT'));
await tester.pumpAndSettle();
expect(value, 'RIGHT');
await tester.tap(find.text('LEFT'));
await tester.pumpAndSettle();
expect(value, 'LEFT');
final Offset leftFlingStart = tester.getCenter(find.text('LEFT CHILD'));
await tester.flingFrom(leftFlingStart, const Offset(-200.0, 0.0), 10000.0);
await tester.pumpAndSettle();
expect(value, 'RIGHT');
final Offset rightFlingStart = tester.getCenter(find.text('RIGHT CHILD'));
await tester.flingFrom(rightFlingStart, const Offset(200.0, 0.0), 10000.0);
await tester.pumpAndSettle();
expect(value, 'LEFT');
});
testWidgets('Explicit TabController', (WidgetTester tester) async {
final List<String> tabs = <String>['LEFT', 'RIGHT'];
late TabController tabController;
Widget buildTabControllerFrame(BuildContext context, TabController controller) {
tabController = controller;
return MaterialApp(
theme: ThemeData(platform: TargetPlatform.android),
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('LEFT CHILD')),
Center(child: Text('RIGHT CHILD')),
],
),
),
);
}
await tester.pumpWidget(TabControllerFrame(
builder: buildTabControllerFrame,
length: tabs.length,
initialIndex: 1,
));
expect(find.text('LEFT'), findsOneWidget);
expect(find.text('RIGHT'), findsOneWidget);
expect(find.text('LEFT CHILD'), findsNothing);
expect(find.text('RIGHT CHILD'), findsOneWidget);
expect(tabController.index, 1);
expect(tabController.previousIndex, 1);
expect(tabController.indexIsChanging, false);
expect(tabController.animation!.value, 1.0);
expect(tabController.animation!.status, AnimationStatus.forward);
tabController.index = 0;
await tester.pump(const Duration(milliseconds: 500));
await tester.pump(const Duration(milliseconds: 500));
expect(find.text('LEFT CHILD'), findsOneWidget);
expect(find.text('RIGHT CHILD'), findsNothing);
tabController.index = 1;
await tester.pump(const Duration(milliseconds: 500));
await tester.pump(const Duration(milliseconds: 500));
expect(find.text('LEFT CHILD'), findsNothing);
expect(find.text('RIGHT CHILD'), findsOneWidget);
});
testWidgets('TabController listener resets index', (WidgetTester tester) async {
// This is a regression test for the scenario brought up here
// https://github.com/flutter/flutter/pull/7387#pullrequestreview-15630946
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.android),
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,
));
tabController.animation!.addListener(() {
if (tabController.animation!.status == AnimationStatus.forward)
tabController.index = 2;
expect(tabController.indexIsChanging, true);
});
expect(tabController.index, 0);
expect(tabController.indexIsChanging, false);
tabController.animateTo(1, duration: const Duration(milliseconds: 200), curve: Curves.linear);
await tester.pump();
await tester.pump(const Duration(milliseconds: 300));
expect(tabController.index, 2);
expect(tabController.indexIsChanging, false);
});
testWidgets('TabBarView child disposed during animation', (WidgetTester tester) async {
// This is a regression test for the scenario brought up here
// https://github.com/flutter/flutter/pull/7387#discussion_r95089191x
final List<String> tabs = <String>['LEFT', 'RIGHT'];
await tester.pumpWidget(buildLeftRightApp(tabs: tabs, value: 'LEFT'));
// Fling to the left, switch from the 'LEFT' tab to the 'RIGHT'
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
});
testWidgets('TabBar unselectedLabelColor control test', (WidgetTester tester) async {
final TabController controller = TabController(
vsync: const TestVSync(),
length: 2,
);
late Color firstColor;
late Color secondColor;
await tester.pumpWidget(
boilerplate(
child: TabBar(
controller: controller,
labelColor: Colors.green[500],
unselectedLabelColor: Colors.blue[500],
tabs: <Widget>[
Builder(
builder: (BuildContext context) {
firstColor = IconTheme.of(context).color!;
return const Text('First');
}
),
Builder(
builder: (BuildContext context) {
secondColor = IconTheme.of(context).color!;
return const Text('Second');
}
),
],
),
),
);
expect(firstColor, equals(Colors.green[500]));
expect(secondColor, equals(Colors.blue[500]));
});
testWidgets('TabBarView page left and right test', (WidgetTester tester) async {
final TabController controller = TabController(
vsync: const TestVSync(),
length: 2,
);
await tester.pumpWidget(
boilerplate(
child: TabBarView(
controller: controller,
children: const <Widget>[ Text('First'), Text('Second') ],
),
),
);
expect(controller.index, equals(0));
TestGesture gesture = await tester.startGesture(const Offset(100.0, 100.0));
expect(controller.index, equals(0));
// Drag to the left and right, by less than the TabBarView's width.
// The selected index (controller.index) should not change.
await gesture.moveBy(const Offset(-100.0, 0.0));
await gesture.moveBy(const Offset(100.0, 0.0));
expect(controller.index, equals(0));
expect(find.text('First'), findsOneWidget);
expect(find.text('Second'), findsNothing);
// Drag more than the TabBarView's width to the right. This forces
// the selected index to change to 1.
await gesture.moveBy(const Offset(-500.0, 0.0));
await gesture.up();
await tester.pump(); // start the scroll animation
await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
expect(controller.index, equals(1));
expect(find.text('First'), findsNothing);
expect(find.text('Second'), findsOneWidget);
gesture = await tester.startGesture(const Offset(100.0, 100.0));
expect(controller.index, equals(1));
// Drag to the left and right, by less than the TabBarView's width.
// The selected index (controller.index) should not change.
await gesture.moveBy(const Offset(-100.0, 0.0));
await gesture.moveBy(const Offset(100.0, 0.0));
expect(controller.index, equals(1));
expect(find.text('First'), findsNothing);
expect(find.text('Second'), findsOneWidget);
// Drag more than the TabBarView's width to the left. This forces
// the selected index to change back to 0.
await gesture.moveBy(const Offset(500.0, 0.0));
await gesture.up();
await tester.pump(); // start the scroll animation
await tester.pump(const Duration(seconds: 1)); // finish the scroll animation
expect(controller.index, equals(0));
expect(find.text('First'), findsOneWidget);
expect(find.text('Second'), findsNothing);
});
testWidgets('TabBar tap animates the selection indicator', (WidgetTester tester) async {
// This is a regression test for https://github.com/flutter/flutter/issues/7479
final List<String> tabs = <String>['A', 'B'];
const Color indicatorColor = Color(0xFFFF0000);
await tester.pumpWidget(buildFrame(tabs: tabs, value: 'A', indicatorColor: indicatorColor));
final RenderBox box = tester.renderObject(find.byType(TabBar));
final TabIndicatorRecordingCanvas canvas = TabIndicatorRecordingCanvas(indicatorColor);
final TestRecordingPaintingContext context = TestRecordingPaintingContext(canvas);
box.paint(context, Offset.zero);
final Rect indicatorRect0 = canvas.indicatorRect;
expect(indicatorRect0.left, 0.0);
expect(indicatorRect0.width, 400.0);
expect(indicatorRect0.height, 2.0);
await tester.tap(find.text('B'));
await tester.pump();
await tester.pump(const Duration(milliseconds: 50));
box.paint(context, Offset.zero);
final Rect indicatorRect1 = canvas.indicatorRect;
expect(indicatorRect1.left, greaterThan(indicatorRect0.left));
expect(indicatorRect1.right, lessThan(800.0));
expect(indicatorRect1.height, 2.0);
await tester.pump(const Duration(milliseconds: 300));
box.paint(context, Offset.zero);
final Rect indicatorRect2 = canvas.indicatorRect;
expect(indicatorRect2.left, 400.0);
expect(indicatorRect2.width, 400.0);
expect(indicatorRect2.height, 2.0);
});
testWidgets('TabBarView child disposed during animation', (WidgetTester tester) async {
// This is a regression test for this patch:
// https://github.com/flutter/flutter/pull/9015
final TabController controller = TabController(
vsync: const TestVSync(),
length: 2,
);
Widget buildFrame() {
return boilerplate(
child: TabBar(
key: UniqueKey(),
controller: controller,
tabs: const <Widget>[ Text('A'), Text('B') ],
),
);
}
await tester.pumpWidget(buildFrame());
// The original TabBar will be disposed. The controller should no
// longer have any listeners from the original TabBar.
await tester.pumpWidget(buildFrame());
controller.index = 1;
await tester.pump(const Duration(milliseconds: 300));
});
testWidgets('TabBarView scrolls end close to a new page', (WidgetTester tester) async {
// This is a regression test for https://github.com/flutter/flutter/issues/9375
final TabController tabController = TabController(
vsync: const TestVSync(),
initialIndex: 1,
length: 3,
);
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: SizedBox.expand(
child: Center(
child: SizedBox(
width: 400.0,
height: 400.0,
child: TabBarView(
controller: tabController,
children: const <Widget>[
Center(child: Text('0')),
Center(child: Text('1')),
Center(child: Text('2')),
],
),
),
),
),
));
expect(tabController.index, 1);
final PageView pageView = tester.widget(find.byType(PageView));
final PageController pageController = pageView.controller;
final ScrollPosition position = pageController.position;
// The TabBarView's page width is 400, so page 0 is at scroll offset 0.0,
// page 1 is at 400.0, page 2 is at 800.0.
expect(position.pixels, 400.0);
// Not close enough to switch to page 2
pageController.jumpTo(500.0);
expect(tabController.index, 1);
// Close enough to switch to page 2
pageController.jumpTo(700.0);
expect(tabController.index, 2);
// Same behavior going left: not left enough to get to page 0
pageController.jumpTo(300.0);
expect(tabController.index, 1);
// Left enough to get to page 0
pageController.jumpTo(100.0);
expect(tabController.index, 0);
});
testWidgets('Can switch to non-neighboring tab in nested TabBarView without crashing', (WidgetTester tester) async {
// This is a regression test for https://github.com/flutter/flutter/issues/18756
final TabController _mainTabController = TabController(length: 4, vsync: const TestVSync());
final TabController _nestedTabController = TabController(length: 2, vsync: const TestVSync());
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Exception for Nested Tabs'),
bottom: TabBar(
controller: _mainTabController,
tabs: const <Widget>[
Tab(icon: Icon(Icons.add), text: 'A'),
Tab(icon: Icon(Icons.add), text: 'B'),
Tab(icon: Icon(Icons.add), text: 'C'),
Tab(icon: Icon(Icons.add), text: 'D'),
],
),
),
body: TabBarView(
controller: _mainTabController,
children: <Widget>[
Container(color: Colors.red),
_NestedTabBarContainer(tabController: _nestedTabController),
Container(color: Colors.green),
Container(color: Colors.indigo),
],
),
),
),
);
// expect first tab to be selected
expect(_mainTabController.index, 0);
// tap on third tab
await tester.tap(find.text('C'));
await tester.pumpAndSettle();
// expect third tab to be selected without exceptions
expect(_mainTabController.index, 2);
});
testWidgets('TabBarView can warp when child is kept alive and contains ink', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/57662.
final TabController controller = TabController(
vsync: const TestVSync(),
length: 3,
);
await tester.pumpWidget(
boilerplate(
child: TabBarView(
controller: controller,
children: const <Widget>[
Text('Page 1'),
Text('Page 2'),
KeepAliveInk('Page 3'),
],
),
),
);
expect(controller.index, equals(0));
expect(find.text('Page 1'), findsOneWidget);
expect(find.text('Page 3'), findsNothing);
controller.index = 2;
await tester.pumpAndSettle();
expect(find.text('Page 1'), findsNothing);
expect(find.text('Page 3'), findsOneWidget);
controller.index = 0;
await tester.pumpAndSettle();
expect(find.text('Page 1'), findsOneWidget);
expect(find.text('Page 3'), findsNothing);
expect(tester.takeException(), isNull);
});
testWidgets('TabBarView scrolls end close to a new page with custom physics', (WidgetTester tester) async {
final TabController tabController = TabController(
vsync: const TestVSync(),
initialIndex: 1,
length: 3,
);
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: SizedBox.expand(
child: Center(
child: SizedBox(
width: 400.0,
height: 400.0,
child: TabBarView(
controller: tabController,
physics: const TestScrollPhysics(),
children: const <Widget>[
Center(child: Text('0')),
Center(child: Text('1')),
Center(child: Text('2')),
],
),
),
),
),
));
expect(tabController.index, 1);
final PageView pageView = tester.widget(find.byType(PageView));
final PageController pageController = pageView.controller;
final ScrollPosition position = pageController.position;
// The TabBarView's page width is 400, so page 0 is at scroll offset 0.0,
// page 1 is at 400.0, page 2 is at 800.0.
expect(position.pixels, 400.0);
// Not close enough to switch to page 2
pageController.jumpTo(500.0);
expect(tabController.index, 1);
// Close enough to switch to page 2
pageController.jumpTo(700.0);
expect(tabController.index, 2);
// Same behavior going left: not left enough to get to page 0
pageController.jumpTo(300.0);
expect(tabController.index, 1);
// Left enough to get to page 0
pageController.jumpTo(100.0);
expect(tabController.index, 0);
});
testWidgets('TabBar accepts custom physics', (WidgetTester tester) async {
final List<Tab> tabs = List<Tab>.generate(20, (int index) {
return Tab(text: 'TAB #$index');
});
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
initialIndex: tabs.length - 1,
);
await tester.pumpWidget(
boilerplate(
child: TabBar(
isScrollable: true,
controller: controller,
tabs: tabs,
physics: const TestScrollPhysics(),
),
),
);
final TabBar tabBar = tester.widget(find.byType(TabBar));
final double position = tabBar.physics!.applyPhysicsToUserOffset(MockScrollMetrics(), 10);
expect(position, equals(20));
});
testWidgets('Scrollable TabBar with a non-zero TabController initialIndex', (WidgetTester tester) async {
// This is a regression test for https://github.com/flutter/flutter/issues/9374
final List<Tab> tabs = List<Tab>.generate(20, (int index) {
return Tab(text: 'TAB #$index');
});
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
initialIndex: tabs.length - 1,
);
await tester.pumpWidget(
boilerplate(
child: TabBar(
isScrollable: true,
controller: controller,
tabs: tabs,
),
),
);
// The initialIndex tab should be visible and right justified
expect(find.text('TAB #19'), findsOneWidget);
// Tabs have a minimum width of 72.0 and 'TAB #19' is wider than
// that. Tabs are padded horizontally with kTabLabelPadding.
final double tabRight = 800.0 - kTabLabelPadding.right;
expect(tester.getTopRight(find.widgetWithText(Tab, 'TAB #19')).dx, tabRight);
});
testWidgets('TabBar with indicatorWeight, indicatorPadding (LTR)', (WidgetTester tester) async {
const Color indicatorColor = Color(0xFF00FF00);
const double indicatorWeight = 8.0;
const double padLeft = 8.0;
const double padRight = 4.0;
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(
boilerplate(
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
indicatorWeight: indicatorWeight,
indicatorColor: indicatorColor,
indicatorPadding: const EdgeInsets.only(left: padLeft, right: padRight),
controller: controller,
tabs: tabs,
),
),
),
);
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
expect(tabBarBox.size.height, 54.0); // 54 = _kTabHeight(46) + indicatorWeight(8.0)
const double indicatorY = 54.0 - indicatorWeight / 2.0;
double indicatorLeft = padLeft + indicatorWeight / 2.0;
double indicatorRight = 200.0 - (padRight + indicatorWeight / 2.0);
expect(tabBarBox, paints..line(
color: indicatorColor,
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
// Select tab 3
controller.index = 3;
await tester.pumpAndSettle();
indicatorLeft = 600.0 + padLeft + indicatorWeight / 2.0;
indicatorRight = 800.0 - (padRight + indicatorWeight / 2.0);
expect(tabBarBox, paints..line(
color: indicatorColor,
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
});
testWidgets('TabBar with indicatorWeight, indicatorPadding (RTL)', (WidgetTester tester) async {
const Color indicatorColor = Color(0xFF00FF00);
const double indicatorWeight = 8.0;
const double padLeft = 8.0;
const double padRight = 4.0;
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(
boilerplate(
textDirection: TextDirection.rtl,
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
indicatorWeight: indicatorWeight,
indicatorColor: indicatorColor,
indicatorPadding: const EdgeInsets.only(left: padLeft, right: padRight),
controller: controller,
tabs: tabs,
),
),
),
);
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
expect(tabBarBox.size.height, 54.0); // 54 = _kTabHeight(46) + indicatorWeight(8.0)
expect(tabBarBox.size.width, 800.0);
const double indicatorY = 54.0 - indicatorWeight / 2.0;
double indicatorLeft = 600.0 + padLeft + indicatorWeight / 2.0;
double indicatorRight = 800.0 - padRight - indicatorWeight / 2.0;
expect(tabBarBox, paints..line(
color: indicatorColor,
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
// Select tab 3
controller.index = 3;
await tester.pumpAndSettle();
indicatorLeft = padLeft + indicatorWeight / 2.0;
indicatorRight = 200.0 - padRight - indicatorWeight / 2.0;
expect(tabBarBox, paints..line(
color: indicatorColor,
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
});
testWidgets('TabBar changes indicator attributes', (WidgetTester tester) async {
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,
);
Color indicatorColor = const Color(0xFF00FF00);
double indicatorWeight = 8.0;
double padLeft = 8.0;
double padRight = 4.0;
Widget buildFrame() {
return boilerplate(
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
indicatorWeight: indicatorWeight,
indicatorColor: indicatorColor,
indicatorPadding: EdgeInsets.only(left: padLeft, right: padRight),
controller: controller,
tabs: tabs,
),
),
);
}
await tester.pumpWidget(buildFrame());
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
expect(tabBarBox.size.height, 54.0); // 54 = _kTabHeight(46) + indicatorWeight(8.0)
double indicatorY = 54.0 - indicatorWeight / 2.0;
double indicatorLeft = padLeft + indicatorWeight / 2.0;
double indicatorRight = 200.0 - (padRight + indicatorWeight / 2.0);
expect(tabBarBox, paints..line(
color: indicatorColor,
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
indicatorColor = const Color(0xFF0000FF);
indicatorWeight = 4.0;
padLeft = 4.0;
padRight = 8.0;
await tester.pumpWidget(buildFrame());
expect(tabBarBox.size.height, 50.0); // 54 = _kTabHeight(46) + indicatorWeight(4.0)
indicatorY = 50.0 - indicatorWeight / 2.0;
indicatorLeft = padLeft + indicatorWeight / 2.0;
indicatorRight = 200.0 - (padRight + indicatorWeight / 2.0);
expect(tabBarBox, paints..line(
color: indicatorColor,
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
});
testWidgets('TabBar with directional indicatorPadding (LTR)', (WidgetTester tester) async {
final List<Widget> tabs = <Widget>[
SizedBox(key: UniqueKey(), width: 130.0, height: 30.0),
SizedBox(key: UniqueKey(), width: 140.0, height: 40.0),
SizedBox(key: UniqueKey(), width: 150.0, height: 50.0),
];
const double indicatorWeight = 2.0; // the default
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
);
await tester.pumpWidget(
boilerplate(
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
indicatorPadding: const EdgeInsetsDirectional.only(start: 100.0),
isScrollable: true,
controller: controller,
tabs: tabs,
),
),
),
);
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
const double tabBarHeight = 50.0 + indicatorWeight; // 50 = max tab height
expect(tabBarBox.size.height, tabBarHeight);
// Tab0 width = 130, height = 30
double tabLeft = kTabLabelPadding.left;
double tabRight = tabLeft + 130.0;
double tabTop = (tabBarHeight - indicatorWeight - 30.0) / 2.0;
double tabBottom = tabTop + 30.0;
Rect tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[0].key!)), tabRect);
// Tab1 width = 140, height = 40
tabLeft = tabRight + kTabLabelPadding.right + kTabLabelPadding.left;
tabRight = tabLeft + 140.0;
tabTop = (tabBarHeight - indicatorWeight - 40.0) / 2.0;
tabBottom = tabTop + 40.0;
tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[1].key!)), tabRect);
// Tab2 width = 150, height = 50
tabLeft = tabRight + kTabLabelPadding.right + kTabLabelPadding.left;
tabRight = tabLeft + 150.0;
tabTop = (tabBarHeight - indicatorWeight - 50.0) / 2.0;
tabBottom = tabTop + 50.0;
tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[2].key!)), tabRect);
// Tab 0 selected, indicator padding resolves to left: 100.0
const double indicatorLeft = 100.0 + indicatorWeight / 2.0;
final double indicatorRight = 130.0 + kTabLabelPadding.horizontal - indicatorWeight / 2.0;
final double indicatorY = tabBottom + indicatorWeight / 2.0;
expect(tabBarBox, paints..line(
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
});
testWidgets('TabBar with directional indicatorPadding (RTL)', (WidgetTester tester) async {
final List<Widget> tabs = <Widget>[
SizedBox(key: UniqueKey(), width: 130.0, height: 30.0),
SizedBox(key: UniqueKey(), width: 140.0, height: 40.0),
SizedBox(key: UniqueKey(), width: 150.0, height: 50.0),
];
const double indicatorWeight = 2.0; // the default
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
);
await tester.pumpWidget(
boilerplate(
textDirection: TextDirection.rtl,
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
indicatorPadding: const EdgeInsetsDirectional.only(start: 100.0),
isScrollable: true,
controller: controller,
tabs: tabs,
),
),
),
);
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
const double tabBarHeight = 50.0 + indicatorWeight; // 50 = max tab height
expect(tabBarBox.size.height, tabBarHeight);
// Tab2 width = 150, height = 50
double tabLeft = kTabLabelPadding.left;
double tabRight = tabLeft + 150.0;
double tabTop = (tabBarHeight - indicatorWeight - 50.0) / 2.0;
double tabBottom = tabTop + 50.0;
Rect tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[2].key!)), tabRect);
// Tab1 width = 140, height = 40
tabLeft = tabRight + kTabLabelPadding.right + kTabLabelPadding.left;
tabRight = tabLeft + 140.0;
tabTop = (tabBarHeight - indicatorWeight - 40.0) / 2.0;
tabBottom = tabTop + 40.0;
tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[1].key!)), tabRect);
// Tab0 width = 130, height = 30
tabLeft = tabRight + kTabLabelPadding.right + kTabLabelPadding.left;
tabRight = tabLeft + 130.0;
tabTop = (tabBarHeight - indicatorWeight - 30.0) / 2.0;
tabBottom = tabTop + 30.0;
tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[0].key!)), tabRect);
// Tab 0 selected, indicator padding resolves to right: 100.0
final double indicatorLeft = tabLeft - kTabLabelPadding.left + indicatorWeight / 2.0;
final double indicatorRight = tabRight + kTabLabelPadding.left - indicatorWeight / 2.0 - 100.0;
const double indicatorY = 50.0 + indicatorWeight / 2.0;
expect(tabBarBox, paints..line(
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
});
testWidgets('TabBar with labelPadding', (WidgetTester tester) async {
const double indicatorWeight = 2.0; // default indicator weight
const EdgeInsets labelPadding = EdgeInsets.only(left: 3.0, right: 7.0);
const EdgeInsets indicatorPadding = labelPadding;
final List<Widget> tabs = <Widget>[
SizedBox(key: UniqueKey(), width: 130.0, height: 30.0),
SizedBox(key: UniqueKey(), width: 140.0, height: 40.0),
SizedBox(key: UniqueKey(), width: 150.0, height: 50.0),
];
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
);
await tester.pumpWidget(
boilerplate(
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
labelPadding: labelPadding,
indicatorPadding: labelPadding,
isScrollable: true,
controller: controller,
tabs: tabs,
),
),
),
);
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
const double tabBarHeight = 50.0 + indicatorWeight; // 50 = max tab height
expect(tabBarBox.size.height, tabBarHeight);
// Tab0 width = 130, height = 30
double tabLeft = labelPadding.left;
double tabRight = tabLeft + 130.0;
double tabTop = (tabBarHeight - indicatorWeight - 30.0) / 2.0;
double tabBottom = tabTop + 30.0;
Rect tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[0].key!)), tabRect);
// Tab1 width = 140, height = 40
tabLeft = tabRight + labelPadding.right + labelPadding.left;
tabRight = tabLeft + 140.0;
tabTop = (tabBarHeight - indicatorWeight - 40.0) / 2.0;
tabBottom = tabTop + 40.0;
tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[1].key!)), tabRect);
// Tab2 width = 150, height = 50
tabLeft = tabRight + labelPadding.right + labelPadding.left;
tabRight = tabLeft + 150.0;
tabTop = (tabBarHeight - indicatorWeight - 50.0) / 2.0;
tabBottom = tabTop + 50.0;
tabRect = Rect.fromLTRB(tabLeft, tabTop, tabRight, tabBottom);
expect(tester.getRect(find.byKey(tabs[2].key!)), tabRect);
// Tab 0 selected, indicatorPadding == labelPadding
final double indicatorLeft = indicatorPadding.left + indicatorWeight / 2.0;
final double indicatorRight = 130.0 + labelPadding.horizontal - indicatorPadding.right - indicatorWeight / 2.0;
final double indicatorY = tabBottom + indicatorWeight / 2.0;
expect(tabBarBox, paints..line(
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
});
testWidgets('Overflowing RTL tab bar', (WidgetTester tester) async {
final List<Widget> tabs = List<Widget>.filled(100,
// For convenience padded width of each tab will equal 100:
// 68 + kTabLabelPadding.horizontal(32)
SizedBox(key: UniqueKey(), width: 68.0, height: 40.0),
);
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
);
const double indicatorWeight = 2.0; // the default
await tester.pumpWidget(
boilerplate(
textDirection: TextDirection.rtl,
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
isScrollable: true,
controller: controller,
tabs: tabs,
),
),
),
);
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
const double tabBarHeight = 40.0 + indicatorWeight; // 40 = tab height
expect(tabBarBox.size.height, tabBarHeight);
// Tab 0 out of 100 selected
double indicatorLeft = 99.0 * 100.0 + indicatorWeight / 2.0;
double indicatorRight = 100.0 * 100.0 - indicatorWeight / 2.0;
const double indicatorY = 40.0 + indicatorWeight / 2.0;
expect(tabBarBox, paints..line(
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
controller.animateTo(tabs.length - 1, duration: const Duration(seconds: 1), curve: Curves.linear);
await tester.pump();
await tester.pump(const Duration(milliseconds: 500));
// The x coordinates of p1 and p2 were derived empirically, not analytically.
expect(tabBarBox, paints..line(
strokeWidth: indicatorWeight,
p1: const Offset(2476.0, indicatorY),
p2: const Offset(2574.0, indicatorY),
));
await tester.pump(const Duration(milliseconds: 501));
// Tab 99 out of 100 selected, appears on the far left because RTL
indicatorLeft = indicatorWeight / 2.0;
indicatorRight = 100.0 - indicatorWeight / 2.0;
expect(tabBarBox, paints..line(
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
});
testWidgets('correct semantics', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final List<Tab> tabs = List<Tab>.generate(2, (int index) {
return Tab(text: 'TAB #$index');
});
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
initialIndex: 0,
);
await tester.pumpWidget(
boilerplate(
child: Semantics(
container: true,
child: TabBar(
isScrollable: true,
controller: controller,
tabs: tabs,
),
),
),
);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
id: 1,
rect: TestSemantics.fullScreen,
children: <TestSemantics>[
TestSemantics(
id: 2,
rect: TestSemantics.fullScreen,
children: <TestSemantics>[
TestSemantics(
id: 3,
rect: TestSemantics.fullScreen,
flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
children: <TestSemantics>[
TestSemantics(
id: 4,
actions: <SemanticsAction>[SemanticsAction.tap],
flags: <SemanticsFlag>[
SemanticsFlag.isSelected,
SemanticsFlag.isFocusable,
],
label: 'TAB #0\nTab 1 of 2',
rect: const Rect.fromLTRB(0.0, 0.0, 116.0, kTextTabBarHeight),
transform: Matrix4.translationValues(0.0, 276.0, 0.0),
),
TestSemantics(
id: 5,
flags: <SemanticsFlag>[SemanticsFlag.isFocusable],
actions: <SemanticsAction>[SemanticsAction.tap],
label: 'TAB #1\nTab 2 of 2',
rect: const Rect.fromLTRB(0.0, 0.0, 116.0, kTextTabBarHeight),
transform: Matrix4.translationValues(116.0, 276.0, 0.0),
),
],
),
],
),
],
),
],
);
expect(semantics, hasSemantics(expectedSemantics));
semantics.dispose();
});
testWidgets('correct scrolling semantics', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final List<Tab> tabs = List<Tab>.generate(20, (int index) {
return Tab(text: 'This is a very wide tab #$index');
});
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
initialIndex: 0,
);
await tester.pumpWidget(
boilerplate(
child: Semantics(
container: true,
child: TabBar(
isScrollable: true,
controller: controller,
tabs: tabs,
),
),
),
);
const String tab0title = 'This is a very wide tab #0\nTab 1 of 20';
const String tab10title = 'This is a very wide tab #10\nTab 11 of 20';
expect(semantics, includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollLeft]));
expect(semantics, includesNodeWith(label: tab0title));
expect(semantics, isNot(includesNodeWith(label: tab10title)));
controller.index = 10;
await tester.pumpAndSettle();
expect(semantics, isNot(includesNodeWith(label: tab0title)));
expect(semantics, includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollLeft, SemanticsAction.scrollRight]));
expect(semantics, includesNodeWith(label: tab10title));
controller.index = 19;
await tester.pumpAndSettle();
expect(semantics, includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollRight]));
controller.index = 0;
await tester.pumpAndSettle();
expect(semantics, includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollLeft]));
expect(semantics, includesNodeWith(label: tab0title));
expect(semantics, isNot(includesNodeWith(label: tab10title)));
semantics.dispose();
});
testWidgets('TabBar etc with zero tabs', (WidgetTester tester) async {
final TabController controller = TabController(
vsync: const TestVSync(),
length: 0,
);
await tester.pumpWidget(
boilerplate(
child: Column(
children: <Widget>[
TabBar(
controller: controller,
tabs: const <Widget>[],
),
Flexible(
child: TabBarView(
controller: controller,
children: const <Widget>[],
),
),
],
),
),
);
expect(controller.index, 0);
expect(tester.getSize(find.byType(TabBar)), const Size(800.0, 48.0));
expect(tester.getSize(find.byType(TabBarView)), const Size(800.0, 600.0 - 48.0));
// A fling in the TabBar or TabBarView, shouldn't do anything.
await tester.fling(find.byType(TabBar), const Offset(-100.0, 0.0), 5000.0);
await tester.pumpAndSettle();
await tester.fling(find.byType(TabBarView), const Offset(100.0, 0.0), 5000.0);
await tester.pumpAndSettle();
expect(controller.index, 0);
});
testWidgets('TabBar etc with one tab', (WidgetTester tester) async {
final TabController controller = TabController(
vsync: const TestVSync(),
length: 1,
);
await tester.pumpWidget(
boilerplate(
child: Column(
children: <Widget>[
TabBar(
controller: controller,
tabs: const <Widget>[Tab(text: 'TAB')],
),
Flexible(
child: TabBarView(
controller: controller,
children: const <Widget>[Text('PAGE')],
),
),
],
),
),
);
expect(controller.index, 0);
expect(find.text('TAB'), findsOneWidget);
expect(find.text('PAGE'), findsOneWidget);
expect(tester.getSize(find.byType(TabBar)), const Size(800.0, 48.0));
expect(tester.getSize(find.byType(TabBarView)), const Size(800.0, 600.0 - 48.0));
// The one tab should be center vis the app's width (800).
final double tabLeft = tester.getTopLeft(find.widgetWithText(Tab, 'TAB')).dx;
final double tabRight = tester.getTopRight(find.widgetWithText(Tab, 'TAB')).dx;
expect(tabLeft + (tabRight - tabLeft) / 2.0, 400.0);
// A fling in the TabBar or TabBarView, shouldn't move the tab.
await tester.fling(find.byType(TabBar), const Offset(-100.0, 0.0), 5000.0);
await tester.pump(const Duration(milliseconds: 50));
expect(tester.getTopLeft(find.widgetWithText(Tab, 'TAB')).dx, tabLeft);
expect(tester.getTopRight(find.widgetWithText(Tab, 'TAB')).dx, tabRight);
await tester.pumpAndSettle();
await tester.fling(find.byType(TabBarView), const Offset(100.0, 0.0), 5000.0);
await tester.pump(const Duration(milliseconds: 50));
expect(tester.getTopLeft(find.widgetWithText(Tab, 'TAB')).dx, tabLeft);
expect(tester.getTopRight(find.widgetWithText(Tab, 'TAB')).dx, tabRight);
await tester.pumpAndSettle();
expect(controller.index, 0);
expect(find.text('TAB'), findsOneWidget);
expect(find.text('PAGE'), findsOneWidget);
});
testWidgets('can tap on indicator at very bottom of TabBar to switch tabs', (WidgetTester tester) async {
final TabController controller = TabController(
vsync: const TestVSync(),
length: 2,
initialIndex: 0,
);
await tester.pumpWidget(
boilerplate(
child: Column(
children: <Widget>[
TabBar(
controller: controller,
indicatorWeight: 30.0,
tabs: const <Widget>[Tab(text: 'TAB1'), Tab(text: 'TAB2')],
),
Flexible(
child: TabBarView(
controller: controller,
children: const <Widget>[Text('PAGE1'), Text('PAGE2')],
),
),
],
),
),
);
expect(controller.index, 0);
final Offset bottomRight = tester.getBottomRight(find.byType(TabBar)) - const Offset(1.0, 1.0);
final TestGesture gesture = await tester.startGesture(bottomRight);
await gesture.up();
await tester.pumpAndSettle();
expect(controller.index, 1);
});
testWidgets('can override semantics of tabs', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final List<Tab> tabs = List<Tab>.generate(2, (int index) {
return Tab(
child: Semantics(
label: 'Semantics override $index',
child: ExcludeSemantics(
child: Text('TAB #$index'),
),
),
);
});
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
initialIndex: 0,
);
await tester.pumpWidget(
boilerplate(
child: Semantics(
container: true,
child: TabBar(
isScrollable: true,
controller: controller,
tabs: tabs,
),
),
),
);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
id: 1,
rect: TestSemantics.fullScreen,
children: <TestSemantics>[
TestSemantics(
id: 2,
rect: TestSemantics.fullScreen,
children: <TestSemantics>[
TestSemantics(
id: 3,
rect: TestSemantics.fullScreen,
flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
children: <TestSemantics>[
TestSemantics(
id: 4,
flags: <SemanticsFlag>[
SemanticsFlag.isSelected,
SemanticsFlag.isFocusable,
],
actions: <SemanticsAction>[SemanticsAction.tap],
label: 'Semantics override 0\nTab 1 of 2',
rect: const Rect.fromLTRB(0.0, 0.0, 116.0, kTextTabBarHeight),
transform: Matrix4.translationValues(0.0, 276.0, 0.0),
),
TestSemantics(
id: 5,
flags: <SemanticsFlag>[SemanticsFlag.isFocusable],
actions: <SemanticsAction>[SemanticsAction.tap],
label: 'Semantics override 1\nTab 2 of 2',
rect: const Rect.fromLTRB(0.0, 0.0, 116.0, kTextTabBarHeight),
transform: Matrix4.translationValues(116.0, 276.0, 0.0),
),
],
),
],
),
],
),
],
);
expect(semantics, hasSemantics(expectedSemantics));
semantics.dispose();
});
testWidgets('can be notified of TabBar onTap behavior', (WidgetTester tester) async {
int tabIndex = -1;
Widget buildFrame({
required TabController controller,
required List<String> tabs,
}) {
return boilerplate(
child: Container(
child: TabBar(
controller: controller,
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
onTap: (int index) {
tabIndex = index;
},
),
),
);
}
final List<String> tabs = <String>['A', 'B', 'C'];
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
initialIndex: tabs.indexOf('C'),
);
await tester.pumpWidget(buildFrame(tabs: tabs, controller: controller));
expect(find.text('A'), findsOneWidget);
expect(find.text('B'), findsOneWidget);
expect(find.text('C'), findsOneWidget);
expect(controller, isNotNull);
expect(controller.index, 2);
expect(tabIndex, -1); // no tap so far so tabIndex should reflect that
// Verify whether the [onTap] notification works when the [TabBar] animates.
await tester.pumpWidget(buildFrame(tabs: tabs, controller: controller));
await tester.tap(find.text('B'));
await tester.pump();
expect(controller.indexIsChanging, true);
await tester.pumpAndSettle();
expect(controller.index, 1);
expect(controller.previousIndex, 2);
expect(controller.indexIsChanging, false);
expect(tabIndex, controller.index);
tabIndex = -1;
await tester.pumpWidget(buildFrame(tabs: tabs, controller: controller));
await tester.tap(find.text('C'));
await tester.pump();
await tester.pumpAndSettle();
expect(controller.index, 2);
expect(controller.previousIndex, 1);
expect(tabIndex, controller.index);
tabIndex = -1;
await tester.pumpWidget(buildFrame(tabs: tabs, controller: controller));
await tester.tap(find.text('A'));
await tester.pump();
await tester.pumpAndSettle();
expect(controller.index, 0);
expect(controller.previousIndex, 2);
expect(tabIndex, controller.index);
tabIndex = -1;
// Verify whether [onTap] is called even when the [TabController] does
// not change.
final int currentControllerIndex = controller.index;
await tester.pumpWidget(buildFrame(tabs: tabs, controller: controller));
await tester.tap(find.text('A'));
await tester.pump();
await tester.pumpAndSettle();
expect(controller.index, currentControllerIndex); // controller has not changed
expect(tabIndex, 0);
});
test('illegal constructor combinations', () {
expect(() => Tab(icon: nonconst(null)), throwsAssertionError);
expect(() => Tab(icon: Container(), text: 'foo', child: Container()), throwsAssertionError);
expect(() => Tab(text: 'foo', child: Container()), throwsAssertionError);
});
testWidgets('Tabs changes mouse cursor when a tab is hovered', (WidgetTester tester) async {
final List<String> tabs = <String>['A', 'B'];
await tester.pumpWidget(MaterialApp(home: DefaultTabController(
length: tabs.length,
child: Scaffold(
body: MouseRegion(
cursor: SystemMouseCursors.forbidden,
child: TabBar(
mouseCursor: SystemMouseCursors.text,
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
),
),
),
),
));
final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse, pointer: 1);
await gesture.addPointer(location: tester.getCenter(find.byType(Tab).first));
addTearDown(gesture.removePointer);
await tester.pump();
expect(RendererBinding.instance!.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.text);
// Test default cursor
await tester.pumpWidget(MaterialApp(home: DefaultTabController(
length: tabs.length,
child: Scaffold(
body: MouseRegion(
cursor: SystemMouseCursors.forbidden,
child: TabBar(
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
),
),
),
),
));
expect(RendererBinding.instance!.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.click);
});
testWidgets('TabController changes', (WidgetTester tester) async {
// This is a regression test for https://github.com/flutter/flutter/issues/14812
Widget buildFrame(TabController controller) {
return boilerplate(
child: Container(
alignment: Alignment.topLeft,
child: TabBar(
controller: controller,
tabs: const <Tab>[
Tab(text: 'LEFT'),
Tab(text: 'RIGHT'),
],
),
),
);
}
final TabController controller1 = TabController(
vsync: const TestVSync(),
length: 2,
initialIndex: 0,
);
final TabController controller2 = TabController(
vsync: const TestVSync(),
length: 2,
initialIndex: 0,
);
await tester.pumpWidget(buildFrame(controller1));
await tester.pumpWidget(buildFrame(controller2));
expect(controller1.index, 0);
expect(controller2.index, 0);
const double indicatorWeight = 2.0;
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
expect(tabBarBox.size.height, 48.0); // 48 = _kTabHeight(46) + indicatorWeight(2.0)
const double indicatorY = 48.0 - indicatorWeight / 2.0;
double indicatorLeft = indicatorWeight / 2.0;
double indicatorRight = 400.0 - indicatorWeight / 2.0; // 400 = screen_width / 2
expect(tabBarBox, paints..line(
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
await tester.tap(find.text('RIGHT'));
await tester.pumpAndSettle();
expect(controller1.index, 0);
expect(controller2.index, 1);
// Verify that the TabBar's _IndicatorPainter is now listening to
// tabController2.
indicatorLeft = 400.0 + indicatorWeight / 2.0;
indicatorRight = 800.0 - indicatorWeight / 2.0;
expect(tabBarBox, paints..line(
strokeWidth: indicatorWeight,
p1: Offset(indicatorLeft, indicatorY),
p2: Offset(indicatorRight, indicatorY),
));
});
testWidgets('Default tab indicator color is white', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/15958
final List<String> tabs = <String>['LEFT', 'RIGHT'];
await tester.pumpWidget(buildLeftRightApp(tabs: tabs, value: 'LEFT'));
final RenderBox tabBarBox = tester.firstRenderObject<RenderBox>(find.byType(TabBar));
expect(tabBarBox, paints..line(
color: Colors.white,
));
});
testWidgets('Skipping tabs with global key does not crash', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/24660
final List<String> tabs = <String>[
'Tab1',
'Tab2',
'Tab3',
'Tab4',
];
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
);
await tester.pumpWidget(
MaterialApp(
home: Align(
alignment: Alignment.topLeft,
child: SizedBox(
width: 300.0,
height: 200.0,
child: 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: <Widget>[
Text('1', key: GlobalKey()),
Text('2', key: GlobalKey()),
Text('3', key: GlobalKey()),
Text('4', key: GlobalKey()),
],
),
),
),
),
),
);
expect(find.text('1'), findsOneWidget);
expect(find.text('4'), findsNothing);
await tester.tap(find.text('Tab4'));
await tester.pumpAndSettle();
expect(controller.index, 3);
expect(find.text('4'), findsOneWidget);
expect(find.text('1'), findsNothing);
});
testWidgets('Skipping tabs with a KeepAlive child works', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/11895
final List<String> tabs = <String>[
'Tab1',
'Tab2',
'Tab3',
'Tab4',
'Tab5',
];
final TabController controller = TabController(
vsync: const TestVSync(),
length: tabs.length,
);
await tester.pumpWidget(
MaterialApp(
home: Align(
alignment: Alignment.topLeft,
child: SizedBox(
width: 300.0,
height: 200.0,
child: 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: <Widget>[
AlwaysKeepAliveWidget(key: UniqueKey()),
const Text('2'),
const Text('3'),
const Text('4'),
const Text('5'),
],
),
),
),
),
),
);
expect(find.text(AlwaysKeepAliveWidget.text), findsOneWidget);
expect(find.text('4'), findsNothing);
await tester.tap(find.text('Tab4'));
await tester.pumpAndSettle();
await tester.pump();
expect(controller.index, 3);
expect(find.text(AlwaysKeepAliveWidget.text, skipOffstage: false), findsOneWidget);
expect(find.text('4'), findsOneWidget);
});
testWidgets('tabbar does not scroll when viewport dimensions initially change from zero to non-zero', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/10531.
const List<Widget> tabs = <Widget>[
Tab(text: 'NEW MEXICO'),
Tab(text: 'GABBA'),
Tab(text: 'HEY'),
];
final TabController controller = TabController(vsync: const TestVSync(), length: tabs.length);
Widget buildTestWidget({double? width, double? height}) {
return MaterialApp(
home: Center(
child: SizedBox(
height: height,
width: width,
child: Scaffold(
appBar: AppBar(
title: const Text('AppBarBug'),
bottom: PreferredSize(
preferredSize: const Size.fromHeight(30.0),
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 15.0),
child: Align(
alignment: FractionalOffset.center,
child: TabBar(
controller: controller,
isScrollable: true,
tabs: tabs,
),
),
),
),
),
body: const Center(
child: Text('Hello World'),
),
),
),
),
);
}
await tester.pumpWidget(
buildTestWidget(
width: 0.0,
height: 0.0,
),
);
await tester.pumpWidget(
buildTestWidget(
width: 300.0,
height: 400.0,
),
);
expect(tester.hasRunningAnimations, isFalse);
expect(await tester.pumpAndSettle(), 1); // no more frames are scheduled.
});
// Regression test for https://github.com/flutter/flutter/issues/20292.
testWidgets('Number of tabs can be updated dynamically', (WidgetTester tester) async {
final List<String> threeTabs = <String>['A', 'B', 'C'];
final List<String> twoTabs = <String>['A', 'B'];
final List<String> oneTab = <String>['A'];
final Key key = UniqueKey();
Widget buildTabs(List<String> tabs) {
return boilerplate(
child: DefaultTabController(
key: key,
length: tabs.length,
child: TabBar(
tabs: tabs.map<Widget>((String tab) => Tab(text: tab)).toList(),
),
),
);
}
TabController getController() => DefaultTabController.of(tester.element(find.text('A')))!;
await tester.pumpWidget(buildTabs(threeTabs));
await tester.tap(find.text('B'));
await tester.pump();
TabController controller = getController();
expect(controller.previousIndex, 0);
expect(controller.index, 1);
expect(controller.length, 3);
await tester.pumpWidget(buildTabs(twoTabs));
controller = getController();
expect(controller.previousIndex, 0);
expect(controller.index, 1);
expect(controller.length, 2);
await tester.pumpWidget(buildTabs(oneTab));
controller = getController();
expect(controller.previousIndex, 1);
expect(controller.index, 0);
expect(controller.length, 1);
await tester.pumpWidget(buildTabs(twoTabs));
controller = getController();
expect(controller.previousIndex, 1);
expect(controller.index, 0);
expect(controller.length, 2);
});
// Regression test for https://github.com/flutter/flutter/issues/15008.
testWidgets('TabBar with one tab has correct color', (WidgetTester tester) async {
const Tab tab = Tab(text: 'A');
const Color selectedTabColor = Color(0x00000001);
const Color unselectedTabColor = Color(0x00000002);
await tester.pumpWidget(boilerplate(
child: const DefaultTabController(
length: 1,
child: TabBar(
tabs: <Tab>[tab],
labelColor: selectedTabColor,
unselectedLabelColor: unselectedTabColor,
),
),
));
final IconThemeData iconTheme = IconTheme.of(tester.element(find.text('A')));
expect(iconTheme.color, equals(selectedTabColor));
});
testWidgets('Replacing the tabController after disposing the old one', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/32428
TabController controller = TabController(vsync: const TestVSync(), length: 2);
await tester.pumpWidget(
MaterialApp(
home: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return Scaffold(
appBar: AppBar(
bottom: TabBar(
controller: controller,
tabs: List<Widget>.generate(controller.length, (int index) => Tab(text: 'Tab$index')),
),
actions: <Widget>[
TextButton(
child: const Text('Change TabController length'),
onPressed: () {
setState(() {
controller.dispose();
controller = TabController(vsync: const TestVSync(), length: 3);
});
},
),
],
),
body: TabBarView(
controller: controller,
children: List<Widget>.generate(controller.length, (int index) => Center(child: Text('Tab $index'))),
),
);
},
),
),
);
expect(controller.index, 0);
expect(controller.length, 2);
expect(find.text('Tab0'), findsOneWidget);
expect(find.text('Tab1'), findsOneWidget);
expect(find.text('Tab2'), findsNothing);
await tester.tap(find.text('Change TabController length'));
await tester.pumpAndSettle();
expect(controller.index, 0);
expect(controller.length, 3);
expect(find.text('Tab0'), findsOneWidget);
expect(find.text('Tab1'), findsOneWidget);
expect(find.text('Tab2'), findsOneWidget);
});
testWidgets('DefaultTabController should allow for a length of zero', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/20292.
List<String> tabTextContent = <String>[];
await tester.pumpWidget(
MaterialApp(
home: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DefaultTabController(
length: tabTextContent.length,
child: Scaffold(
appBar: AppBar(
title: const Text('Default TabBar Preview'),
bottom: tabTextContent.isNotEmpty
? TabBar(
isScrollable: true,
tabs: tabTextContent.map((String textContent) => Tab(text: textContent)).toList(),
)
: null,
),
body: tabTextContent.isNotEmpty
? TabBarView(
children: tabTextContent.map((String textContent) => Tab(text: "$textContent's view")).toList()
)
: const Center(child: Text('No tabs')),
bottomNavigationBar: BottomAppBar(
child: Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
IconButton(
key: const Key('Add tab'),
icon: const Icon(Icons.add),
onPressed: () {
setState(() {
tabTextContent = List<String>.from(tabTextContent)
..add('Tab ${tabTextContent.length + 1}');
});
},
),
IconButton(
key: const Key('Delete tab'),
icon: const Icon(Icons.delete),
onPressed: () {
setState(() {
tabTextContent = List<String>.from(tabTextContent)
..removeLast();
});
},
),
],
),
),
),
);
},
),
),
);
// Initializes with zero tabs properly
expect(find.text('No tabs'), findsOneWidget);
await tester.tap(find.byKey(const Key('Add tab')));
await tester.pumpAndSettle();
expect(find.text('Tab 1'), findsOneWidget);
expect(find.text("Tab 1's view"), findsOneWidget);
// Dynamically updates to zero tabs properly
await tester.tap(find.byKey(const Key('Delete tab')));
await tester.pumpAndSettle();
expect(find.text('No tabs'), findsOneWidget);
});
testWidgets('TabBar expands vertically to accommodate the Icon and child Text() pair the same amount it would expand for Icon and text pair.', (WidgetTester tester) async {
const double indicatorWeight = 2.0;
const List<Widget> tabListWithText = <Widget>[
Tab(icon: Icon(Icons.notifications), text: 'Test'),
];
const List<Widget> tabListWithTextChild = <Widget>[
Tab(icon: Icon(Icons.notifications), child: Text('Test')),
];
const TabBar tabBarWithText = TabBar(tabs: tabListWithText, indicatorWeight: indicatorWeight,);
const TabBar tabBarWithTextChild = TabBar(tabs: tabListWithTextChild, indicatorWeight: indicatorWeight,);
expect(tabBarWithText.preferredSize, tabBarWithTextChild.preferredSize);
});
testWidgets('Setting TabController index should make TabBar indicator immediately pop into the position', (WidgetTester tester) async {
const List<Tab> tabs = <Tab>[
Tab(text: 'A'), Tab(text: 'B'), Tab(text: 'C')
];
const Color indicatorColor = Color(0xFFFF0000);
late TabController tabController;
Widget buildTabControllerFrame(BuildContext context, TabController controller) {
tabController = controller;
return MaterialApp(
home: Scaffold(
appBar: AppBar(
bottom: TabBar(
controller: controller,
tabs: tabs,
indicatorColor: indicatorColor,
),
),
body: TabBarView(
controller: controller,
children: tabs.map((Tab tab) {
return Center(child: Text(tab.text!));
}).toList(),
),
),
);
}
await tester.pumpWidget(TabControllerFrame(
builder: buildTabControllerFrame,
length: tabs.length,
initialIndex: 0,
));
final RenderBox box = tester.renderObject(find.byType(TabBar));
final TabIndicatorRecordingCanvas canvas = TabIndicatorRecordingCanvas(indicatorColor);
final TestRecordingPaintingContext context = TestRecordingPaintingContext(canvas);
box.paint(context, Offset.zero);
double expectedIndicatorLeft = canvas.indicatorRect.left;
final PageView pageView = tester.widget(find.byType(PageView));
final PageController pageController = pageView.controller;
void pageControllerListener() {
// Whenever TabBarView scrolls due to changing TabController's index,
// check if indicator stays idle in its expectedIndicatorLeft
box.paint(context, Offset.zero);
expect(canvas.indicatorRect.left, expectedIndicatorLeft);
}
// Moving from index 0 to 2 (distanced tabs)
tabController.index = 2;
box.paint(context, Offset.zero);
expectedIndicatorLeft = canvas.indicatorRect.left;
pageController.addListener(pageControllerListener);
await tester.pumpAndSettle();
// Moving from index 2 to 1 (neighboring tabs)
tabController.index = 1;
box.paint(context, Offset.zero);
expectedIndicatorLeft = canvas.indicatorRect.left;
await tester.pumpAndSettle();
pageController.removeListener(pageControllerListener);
});
testWidgets('Setting BouncingScrollPhysics on TabBarView does not include ClampingScrollPhysics', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/57708
await tester.pumpWidget(MaterialApp(
home: DefaultTabController(
length: 10,
child: Scaffold(
body: TabBarView(
physics: const BouncingScrollPhysics(),
children: List<Widget>.generate(10, (int i) => Center(child: Text('index $i'))),
),
),
)
));
final PageView pageView = tester.widget<PageView>(find.byType(PageView));
expect(pageView.physics.toString().contains('ClampingScrollPhysics'), isFalse);
});
testWidgets('TabController changes offset attribute', (WidgetTester tester) async {
final TabController controller = TabController(
vsync: const TestVSync(),
length: 2,
);
late Color firstColor;
late Color secondColor;
await tester.pumpWidget(
boilerplate(
child: TabBar(
controller: controller,
labelColor: Colors.white,
unselectedLabelColor: Colors.black,
tabs: <Widget>[
Builder(builder: (BuildContext context) {
firstColor = DefaultTextStyle.of(context).style.color!;
return const Text('First');
}),
Builder(builder: (BuildContext context) {
secondColor = DefaultTextStyle.of(context).style.color!;
return const Text('Second');
}),
],
),
),
);
expect(firstColor, equals(Colors.white));
expect(secondColor, equals(Colors.black));
controller.offset = 0.6;
await tester.pump();
expect(firstColor, equals(Color.lerp(Colors.white, Colors.black, 0.6)));
expect(secondColor, equals(Color.lerp(Colors.black, Colors.white, 0.6)));
controller.index = 1;
await tester.pump();
expect(firstColor, equals(Colors.black));
expect(secondColor, equals(Colors.white));
controller.offset = 0.6;
await tester.pump();
expect(firstColor, equals(Colors.black));
expect(secondColor, equals(Colors.white));
});
testWidgets('Crash on dispose', (WidgetTester tester) async {
await tester.pumpWidget(Padding(padding: const EdgeInsets.only(right: 200.0), child: TabBarDemo()));
await tester.tap(find.byIcon(Icons.directions_bike));
// There was a time where this would throw an exception
// because we tried to send a notification on dispose.
});
testWidgets('TabController\'s animation value should be in sync with TabBarView\'s scroll value when user interrupts ballistic scroll', (WidgetTester tester) async {
final TabController tabController = TabController(
vsync: const TestVSync(),
length: 3,
);
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: SizedBox.expand(
child: Center(
child: SizedBox(
width: 400.0,
height: 400.0,
child: TabBarView(
controller: tabController,
children: const <Widget>[
Center(child: Text('0')),
Center(child: Text('1')),
Center(child: Text('2')),
],
),
),
),
),
));
final PageView pageView = tester.widget(find.byType(PageView));
final PageController pageController = pageView.controller;
final ScrollPosition position = pageController.position;
expect(tabController.index, 0);
expect(position.pixels, 0.0);
pageController.jumpTo(300.0);
await tester.pump();
expect(tabController.animation!.value, pageController.page);
// Touch TabBarView while ballistic scrolling is happening and
// check if tabController's animation value properly follows page value.
await tester.startGesture(tester.getCenter(find.byType(PageView)));
await tester.pump();
expect(tabController.animation!.value, pageController.page);
});
}
class KeepAliveInk extends StatefulWidget {
const KeepAliveInk(this.title, {Key? key}) : super(key: key);
final String title;
@override
State<StatefulWidget> createState() {
return _KeepAliveInkState();
}
}
class _KeepAliveInkState extends State<KeepAliveInk> with AutomaticKeepAliveClientMixin {
@override
Widget build(BuildContext context) {
super.build(context);
return Ink(
child: Text(widget.title),
);
}
@override
bool get wantKeepAlive => true;