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dart / external / github.com / flutter / flutter / 9a3b9f62a9d34f8d970496d403e99e61f1e2072e / . / packages / flutter / test / material / dropdown_test.dart
blob: 23b0c0188ae272315bfb6d1351211d58ee27786c [file] [log] [blame]
// 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.
// no-shuffle:
// //TODO(gspencergoog): Remove this tag once this test's state leaks/test
// dependencies have been fixed.
// https://github.com/flutter/flutter/issues/85160
// Fails with "flutter test --test-randomize-ordering-seed=456"
// reduced-test-set:
// This file is run as part of a reduced test set in CI on Mac and Windows
// machines.
@Tags(<String>['reduced-test-set', 'no-shuffle'])
import 'dart:math' as math;
import 'package:flutter/cupertino.dart';
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 '../widgets/semantics_tester.dart';
import 'feedback_tester.dart';
const List<String> menuItems = <String>['one', 'two', 'three', 'four'];
void onChanged<T>(T _) { }
final Type dropdownButtonType = DropdownButton<String>(
onChanged: (_) { },
items: const <DropdownMenuItem<String>>[],
).runtimeType;
Finder _iconRichText(Key iconKey) {
return find.descendant(
of: find.byKey(iconKey),
matching: find.byType(RichText),
);
}
Widget buildDropdown({
required bool isFormField,
Key? buttonKey,
String? value = 'two',
ValueChanged<String?>? onChanged,
VoidCallback? onTap,
Widget? icon,
Color? iconDisabledColor,
Color? iconEnabledColor,
double iconSize = 24.0,
bool isDense = false,
bool isExpanded = false,
Widget? hint,
Widget? disabledHint,
Widget? underline,
List<String>? items = menuItems,
List<Widget> Function(BuildContext)? selectedItemBuilder,
double? itemHeight = kMinInteractiveDimension,
AlignmentDirectional alignment = AlignmentDirectional.centerStart,
TextDirection textDirection = TextDirection.ltr,
Size? mediaSize,
FocusNode? focusNode,
bool autofocus = false,
Color? focusColor,
Color? dropdownColor,
double? menuMaxHeight,
}) {
final List<DropdownMenuItem<String>>? listItems = items?.map<DropdownMenuItem<String>>((String item) {
return DropdownMenuItem<String>(
key: ValueKey<String>(item),
value: item,
child: Text(item, key: ValueKey<String>('${item}Text')),
);
}).toList();
if (isFormField) {
return Form(
child: DropdownButtonFormField<String>(
key: buttonKey,
value: value,
hint: hint,
disabledHint: disabledHint,
onChanged: onChanged,
onTap: onTap,
icon: icon,
iconSize: iconSize,
iconDisabledColor: iconDisabledColor,
iconEnabledColor: iconEnabledColor,
isDense: isDense,
isExpanded: isExpanded,
// No underline attribute
focusNode: focusNode,
autofocus: autofocus,
focusColor: focusColor,
dropdownColor: dropdownColor,
items: listItems,
selectedItemBuilder: selectedItemBuilder,
itemHeight: itemHeight,
alignment: alignment,
menuMaxHeight: menuMaxHeight,
),
);
}
return DropdownButton<String>(
key: buttonKey,
value: value,
hint: hint,
disabledHint: disabledHint,
onChanged: onChanged,
onTap: onTap,
icon: icon,
iconSize: iconSize,
iconDisabledColor: iconDisabledColor,
iconEnabledColor: iconEnabledColor,
isDense: isDense,
isExpanded: isExpanded,
underline: underline,
focusNode: focusNode,
autofocus: autofocus,
focusColor: focusColor,
dropdownColor: dropdownColor,
items: listItems,
selectedItemBuilder: selectedItemBuilder,
itemHeight: itemHeight,
alignment: alignment,
menuMaxHeight: menuMaxHeight,
);
}
Widget buildFrame({
Key? buttonKey,
String? value = 'two',
ValueChanged<String?>? onChanged,
VoidCallback? onTap,
Widget? icon,
Color? iconDisabledColor,
Color? iconEnabledColor,
double iconSize = 24.0,
bool isDense = false,
bool isExpanded = false,
Widget? hint,
Widget? disabledHint,
Widget? underline,
List<String>? items = menuItems,
List<Widget> Function(BuildContext)? selectedItemBuilder,
double? itemHeight = kMinInteractiveDimension,
AlignmentDirectional alignment = AlignmentDirectional.centerStart,
TextDirection textDirection = TextDirection.ltr,
Size? mediaSize,
FocusNode? focusNode,
bool autofocus = false,
Color? focusColor,
Color? dropdownColor,
bool isFormField = false,
double? menuMaxHeight,
Alignment dropdownAlignment = Alignment.center,
}) {
return TestApp(
textDirection: textDirection,
mediaSize: mediaSize,
child: Material(
child: Align(
alignment: dropdownAlignment,
child: RepaintBoundary(
child: buildDropdown(
isFormField: isFormField,
buttonKey: buttonKey,
value: value,
hint: hint,
disabledHint: disabledHint,
onChanged: onChanged,
onTap: onTap,
icon: icon,
iconSize: iconSize,
iconDisabledColor: iconDisabledColor,
iconEnabledColor: iconEnabledColor,
isDense: isDense,
isExpanded: isExpanded,
underline: underline,
focusNode: focusNode,
autofocus: autofocus,
focusColor: focusColor,
dropdownColor: dropdownColor,
items: items,
selectedItemBuilder: selectedItemBuilder,
itemHeight: itemHeight,
alignment: alignment,
menuMaxHeight: menuMaxHeight,
),
),
),
),
);
}
class TestApp extends StatefulWidget {
const TestApp({
super.key,
required this.textDirection,
required this.child,
this.mediaSize,
});
final TextDirection textDirection;
final Widget child;
final Size? mediaSize;
@override
State<TestApp> createState() => _TestAppState();
}
class _TestAppState extends State<TestApp> {
@override
Widget build(BuildContext context) {
return Localizations(
locale: const Locale('en', 'US'),
delegates: const <LocalizationsDelegate<dynamic>>[
DefaultWidgetsLocalizations.delegate,
DefaultMaterialLocalizations.delegate,
],
child: MediaQuery(
data: MediaQueryData.fromWindow(WidgetsBinding.instance.window).copyWith(size: widget.mediaSize),
child: Directionality(
textDirection: widget.textDirection,
child: Navigator(
onGenerateRoute: (RouteSettings settings) {
assert(settings.name == '/');
return MaterialPageRoute<void>(
settings: settings,
builder: (BuildContext context) => widget.child,
);
},
),
),
),
);
}
}
// When the dropdown's menu is popped up, a RenderParagraph for the selected
// menu's text item will appear both in the dropdown button and in the menu.
// The RenderParagraphs should be aligned, i.e. they should have the same
// size and location.
void checkSelectedItemTextGeometry(WidgetTester tester, String value) {
final List<RenderBox> boxes = tester.renderObjectList<RenderBox>(find.byKey(ValueKey<String>('${value}Text'))).toList();
expect(boxes.length, equals(2));
final RenderBox box0 = boxes[0];
final RenderBox box1 = boxes[1];
expect(box0.localToGlobal(Offset.zero), equals(box1.localToGlobal(Offset.zero)));
expect(box0.size, equals(box1.size));
}
Future<void> checkDropdownColor(WidgetTester tester, {Color? color, bool isFormField = false }) async {
const String text = 'foo';
await tester.pumpWidget(
MaterialApp(
home: Material(
child: isFormField
? Form(
child: DropdownButtonFormField<String>(
dropdownColor: color,
value: text,
items: const <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
value: text,
child: Text(text),
),
],
onChanged: (_) {},
),
)
: DropdownButton<String>(
dropdownColor: color,
value: text,
items: const <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
value: text,
child: Text(text),
),
],
onChanged: (_) {},
),
),
),
);
await tester.tap(find.text(text));
await tester.pump();
expect(
find.ancestor(
of: find.text(text).last,
matching: find.byType(CustomPaint),
).at(2),
paints
..save()
..rrect()
..rrect()
..rrect()
..rrect(color: color ?? Colors.grey[50], hasMaskFilter: false),
);
}
void main() {
testWidgets('Default dropdown golden', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget build() => buildFrame(buttonKey: buttonKey, onChanged: onChanged);
await tester.pumpWidget(build());
final Finder buttonFinder = find.byKey(buttonKey);
assert(tester.renderObject(buttonFinder).attached);
await expectLater(
find.ancestor(of: buttonFinder, matching: find.byType(RepaintBoundary)).first,
matchesGoldenFile('dropdown_test.default.png'),
);
});
testWidgets('Expanded dropdown golden', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget build() => buildFrame(buttonKey: buttonKey, isExpanded: true, onChanged: onChanged);
await tester.pumpWidget(build());
final Finder buttonFinder = find.byKey(buttonKey);
assert(tester.renderObject(buttonFinder).attached);
await expectLater(
find.ancestor(of: buttonFinder, matching: find.byType(RepaintBoundary)).first,
matchesGoldenFile('dropdown_test.expanded.png'),
);
});
testWidgets('Dropdown button control test', (WidgetTester tester) async {
String? value = 'one';
void didChangeValue(String? newValue) {
value = newValue;
}
Widget build() => buildFrame(value: value, onChanged: didChangeValue);
await tester.pumpWidget(build());
await tester.tap(find.text('one'));
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('one'));
await tester.tap(find.text('three').last);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('three'));
await tester.tap(find.text('three'), warnIfMissed: false);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('three'));
await tester.pumpWidget(build());
await tester.tap(find.text('two').last);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('two'));
});
testWidgets('Dropdown button with no app', (WidgetTester tester) async {
String? value = 'one';
void didChangeValue(String? newValue) {
value = newValue;
}
Widget build() {
return Directionality(
textDirection: TextDirection.ltr,
child: Navigator(
initialRoute: '/',
onGenerateRoute: (RouteSettings settings) {
return MaterialPageRoute<void>(
settings: settings,
builder: (BuildContext context) {
return Material(
child: buildFrame(value: 'one', onChanged: didChangeValue),
);
},
);
},
),
);
}
await tester.pumpWidget(build());
await tester.tap(find.text('one'));
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('one'));
await tester.tap(find.text('three').last);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('three'));
await tester.tap(find.text('three'), warnIfMissed: false);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('three'));
await tester.pumpWidget(build());
await tester.tap(find.text('two').last);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('two'));
});
testWidgets('DropdownButton does not allow duplicate item values', (WidgetTester tester) async {
final List<DropdownMenuItem<String>> itemsWithDuplicateValues = <String>['a', 'b', 'c', 'c']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList();
await expectLater(
() => tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: DropdownButton<String>(
value: 'c',
onChanged: (String? newValue) {},
items: itemsWithDuplicateValues,
),
),
),
),
throwsA(isAssertionError.having(
(AssertionError error) => error.toString(),
'.toString()',
contains("There should be exactly one item with [DropdownButton]'s value"),
)),
);
});
testWidgets('DropdownButton value should only appear in one menu item', (WidgetTester tester) async {
final List<DropdownMenuItem<String>> itemsWithDuplicateValues = <String>['a', 'b', 'c', 'd']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList();
await expectLater(
() => tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: DropdownButton<String>(
value: 'e',
onChanged: (String? newValue) {},
items: itemsWithDuplicateValues,
),
),
),
),
throwsA(isAssertionError.having(
(AssertionError error) => error.toString(),
'.toString()',
contains("There should be exactly one item with [DropdownButton]'s value"),
)),
);
});
testWidgets('Dropdown form field uses form field state', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
final GlobalKey<FormState> formKey = GlobalKey<FormState>();
String? value;
await tester.pumpWidget(
StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return MaterialApp(
home: Material(
child: Form(
key: formKey,
child: DropdownButtonFormField<String>(
key: buttonKey,
value: value,
hint: const Text('Select Value'),
decoration: const InputDecoration(
prefixIcon: Icon(Icons.fastfood),
),
items: menuItems.map((String val) {
return DropdownMenuItem<String>(
value: val,
child: Text(val),
);
}).toList(),
validator: (String? v) => v == null ? 'Must select value' : null,
onChanged: (String? newValue) {},
onSaved: (String? v) {
setState(() {
value = v;
});
},
),
),
),
);
},
),
);
int getIndex() {
final IndexedStack stack = tester.element(find.byType(IndexedStack)).widget as IndexedStack;
return stack.index!;
}
// Initial value of null displays hint
expect(value, equals(null));
expect(getIndex(), 4);
await tester.tap(find.text('Select Value'), warnIfMissed: false);
await tester.pumpAndSettle();
await tester.tap(find.text('three').last);
await tester.pumpAndSettle();
expect(getIndex(), 2);
// Changes only made to FormField state until form saved
expect(value, equals(null));
final FormState form = formKey.currentState!;
form.save();
expect(value, equals('three'));
});
testWidgets('Dropdown in ListView', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/12053
// Positions a DropdownButton at the left and right edges of the screen,
// forcing it to be sized down to the viewport width
const String value = 'foo';
final UniqueKey itemKey = UniqueKey();
await tester.pumpWidget(
MaterialApp(
home: Material(
child: ListView(
children: <Widget>[
DropdownButton<String>(
value: value,
items: <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
key: itemKey,
value: value,
child: const Text(value),
),
],
onChanged: (_) { },
),
],
),
),
),
);
await tester.tap(find.text(value));
await tester.pump();
final List<RenderBox> itemBoxes = tester.renderObjectList<RenderBox>(find.byKey(itemKey)).toList();
expect(itemBoxes[0].localToGlobal(Offset.zero).dx, equals(0.0));
expect(itemBoxes[1].localToGlobal(Offset.zero).dx, equals(16.0));
expect(itemBoxes[1].size.width, equals(800.0 - 16.0 * 2));
});
testWidgets('Dropdown menu can position correctly inside a nested navigator', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/66870
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
appBar: AppBar(),
body: Column(
children: <Widget>[
ConstrainedBox(
constraints: const BoxConstraints(maxWidth: 500, maxHeight: 200),
child: Navigator(
onGenerateRoute: (RouteSettings s) {
return MaterialPageRoute<void>(builder: (BuildContext context) {
return Center(
child: DropdownButton<int>(
value: 1,
items: const <DropdownMenuItem<int>>[
DropdownMenuItem<int>(
value: 1,
child: Text('First Item'),
),
DropdownMenuItem<int>(
value: 2,
child: Text('Second Item'),
),
],
onChanged: (_) { },
),
);
});
},
),
),
],
),
),
),
);
await tester.tap(find.text('First Item'));
await tester.pump();
final RenderBox secondItem = tester.renderObjectList<RenderBox>(find.text('Second Item')).toList()[1];
expect(secondItem.localToGlobal(Offset.zero).dx, equals(150.0));
expect(secondItem.localToGlobal(Offset.zero).dy, equals(176.0));
});
testWidgets('Dropdown screen edges', (WidgetTester tester) async {
int? value = 4;
final List<DropdownMenuItem<int>> items = <DropdownMenuItem<int>>[
for (int i = 0; i < 20; ++i) DropdownMenuItem<int>(value: i, child: Text('$i')),
];
void handleChanged(int? newValue) {
value = newValue;
}
final DropdownButton<int> button = DropdownButton<int>(
value: value,
onChanged: handleChanged,
items: items,
);
await tester.pumpWidget(
MaterialApp(
home: Material(
child: Align(
alignment: Alignment.topCenter,
child: button,
),
),
),
);
await tester.tap(find.text('4'));
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
// We should have two copies of item 5, one in the menu and one in the
// button itself.
expect(tester.elementList(find.text('5')), hasLength(2));
// We should only have one copy of item 19, which is in the button itself.
// The copy in the menu shouldn't be in the tree because it's off-screen.
expect(tester.elementList(find.text('19')), hasLength(1));
expect(value, 4);
await tester.tap(find.byWidget(button), warnIfMissed: false);
expect(value, 4);
// this waits for the route's completer to complete, which calls handleChanged
await tester.idle();
expect(value, 4);
});
for (final TextDirection textDirection in TextDirection.values) {
testWidgets('Dropdown button aligns selected menu item ($textDirection)', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget build() => buildFrame(buttonKey: buttonKey, textDirection: textDirection, onChanged: onChanged);
await tester.pumpWidget(build());
final RenderBox buttonBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBox.attached);
final Offset buttonOriginBeforeTap = buttonBox.localToGlobal(Offset.zero);
await tester.tap(find.text('two'));
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
// Tapping the dropdown button should not cause it to move.
expect(buttonBox.localToGlobal(Offset.zero), equals(buttonOriginBeforeTap));
// The selected dropdown item is both in menu we just popped up, and in
// the IndexedStack contained by the dropdown button. Both of them should
// have the same origin and height as the dropdown button.
final List<RenderBox> itemBoxes = tester.renderObjectList<RenderBox>(find.byKey(const ValueKey<String>('two'))).toList();
expect(itemBoxes.length, equals(2));
for (final RenderBox itemBox in itemBoxes) {
assert(itemBox.attached);
assert(textDirection != null);
switch (textDirection) {
case TextDirection.rtl:
expect(
buttonBox.localToGlobal(buttonBox.size.bottomRight(Offset.zero)),
equals(itemBox.localToGlobal(itemBox.size.bottomRight(Offset.zero))),
);
break;
case TextDirection.ltr:
expect(buttonBox.localToGlobal(Offset.zero), equals(itemBox.localToGlobal(Offset.zero)));
break;
}
expect(buttonBox.size.height, equals(itemBox.size.height));
}
// The two RenderParagraph objects, for the 'two' items' Text children,
// should have the same size and location.
checkSelectedItemTextGeometry(tester, 'two');
await tester.pumpWidget(Container()); // reset test
});
}
testWidgets('Arrow icon aligns with the edge of button when expanded', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget build() => buildFrame(buttonKey: buttonKey, isExpanded: true, onChanged: onChanged);
await tester.pumpWidget(build());
final RenderBox buttonBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBox.attached);
final RenderBox arrowIcon = tester.renderObject<RenderBox>(find.byIcon(Icons.arrow_drop_down));
assert(arrowIcon.attached);
// Arrow icon should be aligned with far right of button when expanded
expect(
arrowIcon.localToGlobal(Offset.zero).dx,
buttonBox.size.centerRight(Offset(-arrowIcon.size.width, 0.0)).dx,
);
});
testWidgets('Dropdown button icon will accept widgets as icons', (WidgetTester tester) async {
final Widget customWidget = Container(
decoration: ShapeDecoration(
shape: CircleBorder(
side: BorderSide(
width: 5.0,
color: Colors.grey.shade700,
),
),
),
);
await tester.pumpWidget(buildFrame(
icon: customWidget,
onChanged: onChanged,
));
expect(find.byWidget(customWidget), findsOneWidget);
expect(find.byIcon(Icons.arrow_drop_down), findsNothing);
await tester.pumpWidget(buildFrame(
icon: const Icon(Icons.assessment),
onChanged: onChanged,
));
expect(find.byIcon(Icons.assessment), findsOneWidget);
expect(find.byIcon(Icons.arrow_drop_down), findsNothing);
});
testWidgets('Dropdown button icon should have default size and colors when not defined', (WidgetTester tester) async {
final Key iconKey = UniqueKey();
final Icon customIcon = Icon(Icons.assessment, key: iconKey);
await tester.pumpWidget(buildFrame(
icon: customIcon,
onChanged: onChanged,
));
// test for size
final RenderBox icon = tester.renderObject(find.byKey(iconKey));
expect(icon.size, const Size(24.0, 24.0));
// test for enabled color
final RichText enabledRichText = tester.widget<RichText>(_iconRichText(iconKey));
expect(enabledRichText.text.style!.color, Colors.grey.shade700);
// test for disabled color
await tester.pumpWidget(buildFrame(
icon: customIcon,
));
final RichText disabledRichText = tester.widget<RichText>(_iconRichText(iconKey));
expect(disabledRichText.text.style!.color, Colors.grey.shade400);
});
testWidgets('Dropdown button icon should have the passed in size and color instead of defaults', (WidgetTester tester) async {
final Key iconKey = UniqueKey();
final Icon customIcon = Icon(Icons.assessment, key: iconKey);
await tester.pumpWidget(buildFrame(
icon: customIcon,
iconSize: 30.0,
iconEnabledColor: Colors.pink,
iconDisabledColor: Colors.orange,
onChanged: onChanged,
));
// test for size
final RenderBox icon = tester.renderObject(find.byKey(iconKey));
expect(icon.size, const Size(30.0, 30.0));
// test for enabled color
final RichText enabledRichText = tester.widget<RichText>(_iconRichText(iconKey));
expect(enabledRichText.text.style!.color, Colors.pink);
// test for disabled color
await tester.pumpWidget(buildFrame(
icon: customIcon,
iconSize: 30.0,
iconEnabledColor: Colors.pink,
iconDisabledColor: Colors.orange,
));
final RichText disabledRichText = tester.widget<RichText>(_iconRichText(iconKey));
expect(disabledRichText.text.style!.color, Colors.orange);
});
testWidgets('Dropdown button should use its own size and color properties over those defined by the theme', (WidgetTester tester) async {
final Key iconKey = UniqueKey();
final Icon customIcon = Icon(
Icons.assessment,
key: iconKey,
size: 40.0,
color: Colors.yellow,
);
await tester.pumpWidget(buildFrame(
icon: customIcon,
iconSize: 30.0,
iconEnabledColor: Colors.pink,
iconDisabledColor: Colors.orange,
onChanged: onChanged,
));
// test for size
final RenderBox icon = tester.renderObject(find.byKey(iconKey));
expect(icon.size, const Size(40.0, 40.0));
// test for enabled color
final RichText enabledRichText = tester.widget<RichText>(_iconRichText(iconKey));
expect(enabledRichText.text.style!.color, Colors.yellow);
// test for disabled color
await tester.pumpWidget(buildFrame(
icon: customIcon,
iconSize: 30.0,
iconEnabledColor: Colors.pink,
iconDisabledColor: Colors.orange,
));
final RichText disabledRichText = tester.widget<RichText>(_iconRichText(iconKey));
expect(disabledRichText.text.style!.color, Colors.yellow);
});
testWidgets('Dropdown button with isDense:true aligns selected menu item', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget build() => buildFrame(buttonKey: buttonKey, isDense: true, onChanged: onChanged);
await tester.pumpWidget(build());
final RenderBox buttonBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBox.attached);
await tester.tap(find.text('two'));
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
// The selected dropdown item is both in menu we just popped up, and in
// the IndexedStack contained by the dropdown button. Both of them should
// have the same vertical center as the button.
final List<RenderBox> itemBoxes = tester.renderObjectList<RenderBox>(find.byKey(const ValueKey<String>('two'))).toList();
expect(itemBoxes.length, equals(2));
// When isDense is true, the button's height is reduced. The menu items'
// heights are not.
final double menuItemHeight = itemBoxes.map<double>((RenderBox box) => box.size.height).reduce(math.max);
expect(menuItemHeight, greaterThan(buttonBox.size.height));
for (final RenderBox itemBox in itemBoxes) {
assert(itemBox.attached);
final Offset buttonBoxCenter = buttonBox.size.center(buttonBox.localToGlobal(Offset.zero));
final Offset itemBoxCenter = itemBox.size.center(itemBox.localToGlobal(Offset.zero));
expect(buttonBoxCenter.dy, equals(itemBoxCenter.dy));
}
// The two RenderParagraph objects, for the 'two' items' Text children,
// should have the same size and location.
checkSelectedItemTextGeometry(tester, 'two');
});
testWidgets('Dropdown button can have a text style with no fontSize specified', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/33425
const String value = 'foo';
final UniqueKey itemKey = UniqueKey();
await tester.pumpWidget(TestApp(
textDirection: TextDirection.ltr,
child: Material(
child: DropdownButton<String>(
value: value,
items: <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
key: itemKey,
value: 'foo',
child: const Text(value),
),
],
isDense: true,
onChanged: (_) { },
style: const TextStyle(color: Colors.blue),
),
),
));
expect(tester.takeException(), isNull);
});
testWidgets('Dropdown menu scrolls to first item in long lists', (WidgetTester tester) async {
// Open the dropdown menu
final Key buttonKey = UniqueKey();
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
value: null, // nothing selected
items: List<String>.generate(/*length=*/ 100, (int index) => index.toString()),
onChanged: onChanged,
));
await tester.tap(find.byKey(buttonKey));
await tester.pump();
await tester.pumpAndSettle(); // finish the menu animation
// Find the first item in the scrollable dropdown list
final Finder menuItemFinder = find.byType(Scrollable);
final RenderBox menuItemContainer = tester.renderObject<RenderBox>(menuItemFinder);
final RenderBox firstItem = tester.renderObject<RenderBox>(
find.descendant(of: menuItemFinder, matching: find.byKey(const ValueKey<String>('0'))),
);
// List should be scrolled so that the first item is at the top. Menu items
// are offset 8.0 from the top edge of the scrollable menu.
const Offset selectedItemOffset = Offset(0.0, -8.0);
expect(
firstItem.size.topCenter(firstItem.localToGlobal(selectedItemOffset)).dy,
equals(menuItemContainer.size.topCenter(menuItemContainer.localToGlobal(Offset.zero)).dy),
);
});
testWidgets('Dropdown menu aligns selected item with button in long lists', (WidgetTester tester) async {
// Open the dropdown menu
final Key buttonKey = UniqueKey();
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
value: '50',
items: List<String>.generate(/*length=*/ 100, (int index) => index.toString()),
onChanged: onChanged,
));
final RenderBox buttonBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
await tester.tap(find.byKey(buttonKey));
await tester.pumpAndSettle(); // finish the menu animation
// Find the selected item in the scrollable dropdown list
final RenderBox selectedItem = tester.renderObject<RenderBox>(
find.descendant(of: find.byType(Scrollable), matching: find.byKey(const ValueKey<String>('50'))),
);
// List should be scrolled so that the selected item is in line with the button
expect(
selectedItem.size.center(selectedItem.localToGlobal(Offset.zero)).dy,
equals(buttonBox.size.center(buttonBox.localToGlobal(Offset.zero)).dy),
);
});
testWidgets('Dropdown menu scrolls to last item in long lists', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
value: '99',
items: List<String>.generate(/*length=*/ 100, (int index) => index.toString()),
onChanged: onChanged,
));
await tester.tap(find.byKey(buttonKey));
await tester.pump();
final ScrollController scrollController = PrimaryScrollController.of(tester.element(find.byType(ListView)))!;
// Make sure there is no overscroll
expect(scrollController.offset, scrollController.position.maxScrollExtent);
// Find the selected item in the scrollable dropdown list
final Finder menuItemFinder = find.byType(Scrollable);
final RenderBox menuItemContainer = tester.renderObject<RenderBox>(menuItemFinder);
final RenderBox selectedItem = tester.renderObject<RenderBox>(
find.descendant(
of: menuItemFinder,
matching: find.byKey(const ValueKey<String>('99')),
),
);
// kMaterialListPadding.vertical is 8.
const Offset menuPaddingOffset = Offset(0.0, -8.0);
final Offset selectedItemOffset = selectedItem.localToGlobal(Offset.zero);
final Offset menuItemContainerOffset = menuItemContainer.localToGlobal(menuPaddingOffset);
// Selected item should be aligned to the bottom of the dropdown menu.
expect(
selectedItem.size.bottomCenter(selectedItemOffset).dy,
menuItemContainer.size.bottomCenter(menuItemContainerOffset).dy,
);
});
testWidgets('Size of DropdownButton with null value', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
String? value;
Widget build() => buildFrame(buttonKey: buttonKey, value: value, onChanged: onChanged);
await tester.pumpWidget(build());
final RenderBox buttonBoxNullValue = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBoxNullValue.attached);
value = 'three';
await tester.pumpWidget(build());
final RenderBox buttonBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBox.attached);
// A Dropdown button with a null value should be the same size as a
// one with a non-null value.
expect(buttonBox.localToGlobal(Offset.zero), equals(buttonBoxNullValue.localToGlobal(Offset.zero)));
expect(buttonBox.size, equals(buttonBoxNullValue.size));
});
testWidgets('Size of DropdownButton with no items', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/26419
final Key buttonKey = UniqueKey();
List<String>? items;
Widget build() => buildFrame(buttonKey: buttonKey, items: items, onChanged: onChanged);
await tester.pumpWidget(build());
final RenderBox buttonBoxNullItems = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBoxNullItems.attached);
items = <String>[];
await tester.pumpWidget(build());
final RenderBox buttonBoxEmptyItems = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBoxEmptyItems.attached);
items = <String>['one', 'two', 'three', 'four'];
await tester.pumpWidget(build());
final RenderBox buttonBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBox.attached);
// A Dropdown button with a null value should be the same size as a
// one with a non-null value.
expect(buttonBox.localToGlobal(Offset.zero), equals(buttonBoxNullItems.localToGlobal(Offset.zero)));
expect(buttonBox.size, equals(buttonBoxNullItems.size));
});
testWidgets('Layout of a DropdownButton with null value', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
String? value;
void onChanged(String? newValue) {
value = newValue;
}
Widget build() => buildFrame(buttonKey: buttonKey, value: value, onChanged: onChanged);
await tester.pumpWidget(build());
final RenderBox buttonBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBox.attached);
// Show the menu.
await tester.tap(find.byKey(buttonKey));
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
// Tap on item 'one', which must appear over the button.
await tester.tap(find.byKey(buttonKey), warnIfMissed: false);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
await tester.pumpWidget(build());
expect(value, equals('one'));
});
testWidgets('Size of DropdownButton with null value and a hint', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
String? value;
// The hint will define the dropdown's width
Widget build() => buildFrame(buttonKey: buttonKey, value: value, hint: const Text('onetwothree'));
await tester.pumpWidget(build());
expect(find.text('onetwothree'), findsOneWidget);
final RenderBox buttonBoxHintValue = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBoxHintValue.attached);
value = 'three';
await tester.pumpWidget(build());
final RenderBox buttonBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
assert(buttonBox.attached);
// A Dropdown button with a null value and a hint should be the same size as a
// one with a non-null value.
expect(buttonBox.localToGlobal(Offset.zero), equals(buttonBoxHintValue.localToGlobal(Offset.zero)));
expect(buttonBox.size, equals(buttonBoxHintValue.size));
});
testWidgets('Dropdown menus must fit within the screen', (WidgetTester tester) async {
// The dropdown menu isn't readily accessible. To find it we're assuming that it
// contains a ListView and that it's an instance of _DropdownMenu.
Rect getMenuRect() {
late Rect menuRect;
tester.element(find.byType(ListView)).visitAncestorElements((Element element) {
if (element.toString().startsWith('_DropdownMenu')) {
final RenderBox box = element.findRenderObject()! as RenderBox;
assert(box != null);
menuRect = box.localToGlobal(Offset.zero) & box.size;
return false;
}
return true;
});
assert(menuRect != null);
return menuRect;
}
// In all of the tests that follow we're assuming that the dropdown menu
// is horizontally aligned with the center of the dropdown button and padded
// on the top, left, and right.
const EdgeInsets buttonPadding = EdgeInsets.only(top: 8.0, left: 16.0, right: 24.0);
Rect getExpandedButtonRect() {
final RenderBox box = tester.renderObject<RenderBox>(find.byType(dropdownButtonType));
final Rect buttonRect = box.localToGlobal(Offset.zero) & box.size;
return buttonPadding.inflateRect(buttonRect);
}
late Rect buttonRect;
late Rect menuRect;
Future<void> popUpAndDown(Widget frame) async {
await tester.pumpWidget(frame);
await tester.tap(find.byType(dropdownButtonType));
await tester.pumpAndSettle();
menuRect = getMenuRect();
buttonRect = getExpandedButtonRect();
await tester.tap(find.byType(dropdownButtonType), warnIfMissed: false);
}
// Dropdown button is along the top of the app. The top of the menu is
// aligned with the top of the expanded button and shifted horizontally
// so that it fits within the frame.
await popUpAndDown(
buildFrame(dropdownAlignment: Alignment.topLeft, value: menuItems.last, onChanged: onChanged),
);
expect(menuRect.topLeft, Offset.zero);
expect(menuRect.topRight, Offset(menuRect.width, 0.0));
await popUpAndDown(
buildFrame(dropdownAlignment: Alignment.topCenter, value: menuItems.last, onChanged: onChanged),
);
expect(menuRect.topLeft, Offset(buttonRect.left, 0.0));
expect(menuRect.topRight, Offset(buttonRect.right, 0.0));
await popUpAndDown(
buildFrame(dropdownAlignment: Alignment.topRight, value: menuItems.last, onChanged: onChanged),
);
expect(menuRect.topLeft, Offset(800.0 - menuRect.width, 0.0));
expect(menuRect.topRight, const Offset(800.0, 0.0));
// Dropdown button is along the middle of the app. The top of the menu is
// aligned with the top of the expanded button (because the 1st item
// is selected) and shifted horizontally so that it fits within the frame.
await popUpAndDown(
buildFrame(dropdownAlignment: Alignment.centerLeft, value: menuItems.first, onChanged: onChanged),
);
expect(menuRect.topLeft, Offset(0.0, buttonRect.top));
expect(menuRect.topRight, Offset(menuRect.width, buttonRect.top));
await popUpAndDown(
buildFrame(value: menuItems.first, onChanged: onChanged),
);
expect(menuRect.topLeft, buttonRect.topLeft);
expect(menuRect.topRight, buttonRect.topRight);
await popUpAndDown(
buildFrame(dropdownAlignment: Alignment.centerRight, value: menuItems.first, onChanged: onChanged),
);
expect(menuRect.topLeft, Offset(800.0 - menuRect.width, buttonRect.top));
expect(menuRect.topRight, Offset(800.0, buttonRect.top));
// Dropdown button is along the bottom of the app. The bottom of the menu is
// aligned with the bottom of the expanded button and shifted horizontally
// so that it fits within the frame.
await popUpAndDown(
buildFrame(dropdownAlignment: Alignment.bottomLeft, value: menuItems.first, onChanged: onChanged),
);
expect(menuRect.bottomLeft, const Offset(0.0, 600.0));
expect(menuRect.bottomRight, Offset(menuRect.width, 600.0));
await popUpAndDown(
buildFrame(dropdownAlignment: Alignment.bottomCenter, value: menuItems.first, onChanged: onChanged),
);
expect(menuRect.bottomLeft, Offset(buttonRect.left, 600.0));
expect(menuRect.bottomRight, Offset(buttonRect.right, 600.0));
await popUpAndDown(
buildFrame(dropdownAlignment: Alignment.bottomRight, value: menuItems.first, onChanged: onChanged),
);
expect(menuRect.bottomLeft, Offset(800.0 - menuRect.width, 600.0));
expect(menuRect.bottomRight, const Offset(800.0, 600.0));
});
testWidgets('Dropdown menus are dismissed on screen orientation changes, but not on keyboard hide', (WidgetTester tester) async {
await tester.pumpWidget(buildFrame(onChanged: onChanged, mediaSize: const Size(800, 600)));
await tester.tap(find.byType(dropdownButtonType));
await tester.pumpAndSettle();
expect(find.byType(ListView), findsOneWidget);
// Show a keyboard (simulate by shortening the height).
await tester.pumpWidget(buildFrame(onChanged: onChanged, mediaSize: const Size(800, 300)));
await tester.pump();
expect(find.byType(ListView, skipOffstage: false), findsOneWidget);
// Hide a keyboard again (simulate by increasing the height).
await tester.pumpWidget(buildFrame(onChanged: onChanged, mediaSize: const Size(800, 600)));
await tester.pump();
expect(find.byType(ListView, skipOffstage: false), findsOneWidget);
// Rotate the device (simulate by changing the aspect ratio).
await tester.pumpWidget(buildFrame(onChanged: onChanged, mediaSize: const Size(600, 800)));
await tester.pump();
expect(find.byType(ListView, skipOffstage: false), findsNothing);
});
testWidgets('Semantics Tree contains only selected element', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(buildFrame(onChanged: onChanged));
expect(semantics, isNot(includesNodeWith(label: menuItems[0])));
expect(semantics, includesNodeWith(label: menuItems[1]));
expect(semantics, isNot(includesNodeWith(label: menuItems[2])));
expect(semantics, isNot(includesNodeWith(label: menuItems[3])));
semantics.dispose();
});
testWidgets('Dropdown button includes semantics', (WidgetTester tester) async {
final SemanticsHandle handle = tester.ensureSemantics();
const Key key = Key('test');
await tester.pumpWidget(buildFrame(
buttonKey: key,
value: null,
onChanged: (String? _) { },
hint: const Text('test'),
));
// By default the hint contributes the label.
expect(tester.getSemantics(find.byKey(key)), matchesSemantics(
isButton: true,
label: 'test',
hasTapAction: true,
isFocusable: true,
));
await tester.pumpWidget(buildFrame(
buttonKey: key,
value: 'three',
onChanged: onChanged,
hint: const Text('test'),
));
// Displays label of select item and is no longer tappable.
expect(tester.getSemantics(find.byKey(key)), matchesSemantics(
isButton: true,
label: 'three',
hasTapAction: true,
isFocusable: true,
));
handle.dispose();
});
testWidgets('Dropdown menu includes semantics', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
const Key key = Key('test');
await tester.pumpWidget(buildFrame(
buttonKey: key,
value: null,
onChanged: onChanged,
));
await tester.tap(find.byKey(key));
await tester.pumpAndSettle();
expect(semantics, hasSemantics(TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
children: <TestSemantics>[
TestSemantics(
children: <TestSemantics>[
TestSemantics(
flags: <SemanticsFlag>[
SemanticsFlag.scopesRoute,
SemanticsFlag.namesRoute,
],
label: 'Popup menu',
children: <TestSemantics>[
TestSemantics(
children: <TestSemantics>[
TestSemantics(
flags: <SemanticsFlag>[
SemanticsFlag.hasImplicitScrolling,
],
children: <TestSemantics>[
TestSemantics(
label: 'one',
textDirection: TextDirection.ltr,
flags: <SemanticsFlag>[
SemanticsFlag.isFocused,
SemanticsFlag.isFocusable,
],
tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
actions: <SemanticsAction>[SemanticsAction.tap],
),
TestSemantics(
label: 'two',
textDirection: TextDirection.ltr,
flags: <SemanticsFlag>[SemanticsFlag.isFocusable],
tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
actions: <SemanticsAction>[SemanticsAction.tap],
),
TestSemantics(
label: 'three',
textDirection: TextDirection.ltr,
flags: <SemanticsFlag>[SemanticsFlag.isFocusable],
tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
actions: <SemanticsAction>[SemanticsAction.tap],
),
TestSemantics(
label: 'four',
textDirection: TextDirection.ltr,
flags: <SemanticsFlag>[SemanticsFlag.isFocusable],
tags: <SemanticsTag>[const SemanticsTag('RenderViewport.twoPane')],
actions: <SemanticsAction>[SemanticsAction.tap],
),
],
),
],
),
],
),
],
),
TestSemantics(),
],
),
],
), ignoreId: true, ignoreRect: true, ignoreTransform: true));
semantics.dispose();
});
testWidgets('disabledHint displays on empty items or onChanged', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget build({ List<String>? items, ValueChanged<String?>? onChanged }) => buildFrame(
items: items,
onChanged: onChanged,
buttonKey: buttonKey,
value: null,
hint: const Text('enabled'),
disabledHint: const Text('disabled'),
);
// [disabledHint] should display when [items] is null
await tester.pumpWidget(build(onChanged: onChanged));
expect(find.text('enabled'), findsNothing);
expect(find.text('disabled'), findsOneWidget);
// [disabledHint] should display when [items] is an empty list.
await tester.pumpWidget(build(items: <String>[], onChanged: onChanged));
expect(find.text('enabled'), findsNothing);
expect(find.text('disabled'), findsOneWidget);
// [disabledHint] should display when [onChanged] is null
await tester.pumpWidget(build(items: menuItems));
expect(find.text('enabled'), findsNothing);
expect(find.text('disabled'), findsOneWidget);
final RenderBox disabledHintBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
// A Dropdown button with a disabled hint should be the same size as a
// one with a regular enabled hint.
await tester.pumpWidget(build(items: menuItems, onChanged: onChanged));
expect(find.text('disabled'), findsNothing);
expect(find.text('enabled'), findsOneWidget);
final RenderBox enabledHintBox = tester.renderObject<RenderBox>(find.byKey(buttonKey));
expect(enabledHintBox.localToGlobal(Offset.zero), equals(disabledHintBox.localToGlobal(Offset.zero)));
expect(enabledHintBox.size, equals(disabledHintBox.size));
});
// Regression test for https://github.com/flutter/flutter/issues/70177
testWidgets('disabledHint behavior test', (WidgetTester tester) async {
Widget build({ List<String>? items, ValueChanged<String?>? onChanged, String? value, Widget? hint, Widget? disabledHint }) => buildFrame(
items: items,
onChanged: onChanged,
value: value,
hint: hint,
disabledHint: disabledHint,
);
// The selected value should be displayed when the button is disabled.
await tester.pumpWidget(build(items: menuItems, value: 'two'));
// The dropdown icon and the selected menu item are vertically aligned.
expect(tester.getCenter(find.text('two')).dy, tester.getCenter(find.byType(Icon)).dy);
// If [value] is null, the button is enabled, hint is displayed.
await tester.pumpWidget(build(
items: menuItems,
onChanged: onChanged,
hint: const Text('hint'),
disabledHint: const Text('disabledHint'),
));
expect(tester.getCenter(find.text('hint')).dy, tester.getCenter(find.byType(Icon)).dy);
// If [value] is null, the button is disabled, [disabledHint] is displayed when [disabledHint] is non-null.
await tester.pumpWidget(build(
items: menuItems,
hint: const Text('hint'),
disabledHint: const Text('disabledHint'),
));
expect(tester.getCenter(find.text('disabledHint')).dy, tester.getCenter(find.byType(Icon)).dy);
// If [value] is null, the button is disabled, [hint] is displayed when [disabledHint] is null.
await tester.pumpWidget(build(
items: menuItems,
hint: const Text('hint'),
));
expect(tester.getCenter(find.text('hint')).dy, tester.getCenter(find.byType(Icon)).dy);
int? getIndex() {
final IndexedStack stack = tester.element(find.byType(IndexedStack)).widget as IndexedStack;
return stack.index;
}
// If [value], [hint] and [disabledHint] are null, the button is disabled, nothing displayed.
await tester.pumpWidget(build(
items: menuItems,
));
expect(getIndex(), null);
// If [value], [hint] and [disabledHint] are null, the button is enabled, nothing displayed.
await tester.pumpWidget(build(
items: menuItems,
onChanged: onChanged,
));
expect(getIndex(), null);
});
testWidgets('DropdownButton selected item color test', (WidgetTester tester) async {
Widget build({ ValueChanged<String?>? onChanged, String? value, Widget? hint, Widget? disabledHint }) {
return MaterialApp(
theme: ThemeData(
disabledColor: Colors.pink,
),
home: Scaffold(
body: Center(
child: Column(children: <Widget>[
DropdownButtonFormField<String>(
style: const TextStyle(
color: Colors.yellow,
),
disabledHint: disabledHint,
hint: hint,
items: const <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
value: 'one',
child: Text('one'),
),
DropdownMenuItem<String>(
value: 'two',
child: Text('two'),
),
],
value: value,
onChanged: onChanged,
),
]),
),
),
);
}
Color textColor(String text) {
return tester.renderObject<RenderParagraph>(find.text(text)).text.style!.color!;
}
// The selected value should be displayed when the button is enabled.
await tester.pumpWidget(build(onChanged: onChanged, value: 'two'));
// The dropdown icon and the selected menu item are vertically aligned.
expect(tester.getCenter(find.text('two')).dy, tester.getCenter(find.byType(Icon)).dy);
// Selected item has a normal color from [DropdownButtonFormField.style]
// when the button is enabled.
expect(textColor('two'), Colors.yellow);
// The selected value should be displayed when the button is disabled.
await tester.pumpWidget(build(value: 'two'));
expect(tester.getCenter(find.text('two')).dy, tester.getCenter(find.byType(Icon)).dy);
// Selected item has a disabled color from [theme.disabledColor]
// when the button is disable.
expect(textColor('two'), Colors.pink);
});
testWidgets(
'DropdowwnButton hint displays when the items list is empty, '
'items is null, and disabledHint is null',
(WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget build({ List<String>? items }) {
return buildFrame(
items: items,
buttonKey: buttonKey,
value: null,
hint: const Text('hint used when disabled'),
);
}
// [hint] should display when [items] is null and [disabledHint] is not defined
await tester.pumpWidget(build());
expect(find.text('hint used when disabled'), findsOneWidget);
// [hint] should display when [items] is an empty list and [disabledHint] is not defined.
await tester.pumpWidget(build(items: <String>[]));
expect(find.text('hint used when disabled'), findsOneWidget);
},
);
testWidgets('DropdownButton disabledHint is null by default', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget build({ List<String>? items }) {
return buildFrame(
items: items,
buttonKey: buttonKey,
value: null,
hint: const Text('hint used when disabled'),
);
}
// [hint] should display when [items] is null and [disabledHint] is not defined
await tester.pumpWidget(build());
expect(find.text('hint used when disabled'), findsOneWidget);
// [hint] should display when [items] is an empty list and [disabledHint] is not defined.
await tester.pumpWidget(build(items: <String>[]));
expect(find.text('hint used when disabled'), findsOneWidget);
});
testWidgets('Size of largest widget is used DropdownButton when selectedItemBuilder is non-null', (WidgetTester tester) async {
final List<String> items = <String>['25', '50', '100'];
const String selectedItem = '25';
await tester.pumpWidget(buildFrame(
// To test the size constraints, the selected item should not be the
// largest item. This validates that the button sizes itself according
// to the largest item regardless of which one is selected.
value: selectedItem,
items: items,
itemHeight: null,
selectedItemBuilder: (BuildContext context) {
return items.map<Widget>((String item) {
return SizedBox(
height: double.parse(item),
width: double.parse(item),
child: Center(child: Text(item)),
);
}).toList();
},
onChanged: (String? newValue) {},
));
final RenderBox dropdownButtonRenderBox = tester.renderObject<RenderBox>(
find.widgetWithText(Row, '25'),
);
// DropdownButton should be the height of the largest item
expect(dropdownButtonRenderBox.size.height, 100);
// DropdownButton should be width of largest item added to the icon size
expect(dropdownButtonRenderBox.size.width, 100 + 24.0);
});
testWidgets(
'Enabled button - Size of largest widget is used DropdownButton when selectedItemBuilder '
'is non-null and hint is defined, but smaller than largest selected item widget',
(WidgetTester tester) async {
final List<String> items = <String>['25', '50', '100'];
await tester.pumpWidget(buildFrame(
value: null,
// [hint] widget is smaller than largest selected item widget
hint: const SizedBox(
height: 50,
width: 50,
child: Text('hint'),
),
items: items,
itemHeight: null,
selectedItemBuilder: (BuildContext context) {
return items.map<Widget>((String item) {
return SizedBox(
height: double.parse(item),
width: double.parse(item),
child: Center(child: Text(item)),
);
}).toList();
},
onChanged: (String? newValue) {},
));
final RenderBox dropdownButtonRenderBox = tester.renderObject<RenderBox>(
find.widgetWithText(Row, 'hint'),
);
// DropdownButton should be the height of the largest item
expect(dropdownButtonRenderBox.size.height, 100);
// DropdownButton should be width of largest item added to the icon size
expect(dropdownButtonRenderBox.size.width, 100 + 24.0);
},
);
testWidgets(
'Enabled button - Size of largest widget is used DropdownButton when selectedItemBuilder '
'is non-null and hint is defined, but larger than largest selected item widget',
(WidgetTester tester) async {
final List<String> items = <String>['25', '50', '100'];
const String selectedItem = '25';
await tester.pumpWidget(buildFrame(
// To test the size constraints, the selected item should not be the
// largest item. This validates that the button sizes itself according
// to the largest item regardless of which one is selected.
value: selectedItem,
// [hint] widget is larger than largest selected item widget
hint: const SizedBox(
height: 125,
width: 125,
child: Text('hint'),
),
items: items,
itemHeight: null,
selectedItemBuilder: (BuildContext context) {
return items.map<Widget>((String item) {
return SizedBox(
height: double.parse(item),
width: double.parse(item),
child: Center(child: Text(item)),
);
}).toList();
},
onChanged: (String? newValue) {},
));
final RenderBox dropdownButtonRenderBox = tester.renderObject<RenderBox>(
find.widgetWithText(Row, '25'),
);
// DropdownButton should be the height of the largest item (hint inclusive)
expect(dropdownButtonRenderBox.size.height, 125);
// DropdownButton should be width of largest item (hint inclusive) added to the icon size
expect(dropdownButtonRenderBox.size.width, 125 + 24.0);
},
);
testWidgets(
'Disabled button - Size of largest widget is used DropdownButton when selectedItemBuilder '
'is non-null, and hint is defined, but smaller than largest selected item widget',
(WidgetTester tester) async {
final List<String> items = <String>['25', '50', '100'];
await tester.pumpWidget(buildFrame(
value: null,
// [hint] widget is smaller than largest selected item widget
hint: const SizedBox(
height: 50,
width: 50,
child: Text('hint'),
),
items: items,
itemHeight: null,
selectedItemBuilder: (BuildContext context) {
return items.map<Widget>((String item) {
return SizedBox(
height: double.parse(item),
width: double.parse(item),
child: Center(child: Text(item)),
);
}).toList();
},
));
final RenderBox dropdownButtonRenderBox = tester.renderObject<RenderBox>(
find.widgetWithText(Row, 'hint'),
);
// DropdownButton should be the height of the largest item
expect(dropdownButtonRenderBox.size.height, 100);
// DropdownButton should be width of largest item added to the icon size
expect(dropdownButtonRenderBox.size.width, 100 + 24.0);
},
);
testWidgets(
'Disabled button - Size of largest widget is used DropdownButton when selectedItemBuilder '
'is non-null and hint is defined, but larger than largest selected item widget',
(WidgetTester tester) async {
final List<String> items = <String>['25', '50', '100'];
await tester.pumpWidget(buildFrame(
value: null,
// [hint] widget is larger than largest selected item widget
hint: const SizedBox(
height: 125,
width: 125,
child: Text('hint'),
),
items: items,
itemHeight: null,
selectedItemBuilder: (BuildContext context) {
return items.map<Widget>((String item) {
return SizedBox(
height: double.parse(item),
width: double.parse(item),
child: Center(child: Text(item)),
);
}).toList();
},
));
final RenderBox dropdownButtonRenderBox = tester.renderObject<RenderBox>(
find.widgetWithText(Row, '25'),
);
// DropdownButton should be the height of the largest item (hint inclusive)
expect(dropdownButtonRenderBox.size.height, 125);
// DropdownButton should be width of largest item (hint inclusive) added to the icon size
expect(dropdownButtonRenderBox.size.width, 125 + 24.0);
},
);
testWidgets(
'Disabled button - Size of largest widget is used DropdownButton when selectedItemBuilder '
'is non-null, and disabledHint is defined, but smaller than largest selected item widget',
(WidgetTester tester) async {
final List<String> items = <String>['25', '50', '100'];
await tester.pumpWidget(buildFrame(
value: null,
// [hint] widget is smaller than largest selected item widget
disabledHint: const SizedBox(
height: 50,
width: 50,
child: Text('hint'),
),
items: items,
itemHeight: null,
selectedItemBuilder: (BuildContext context) {
return items.map<Widget>((String item) {
return SizedBox(
height: double.parse(item),
width: double.parse(item),
child: Center(child: Text(item)),
);
}).toList();
},
));
final RenderBox dropdownButtonRenderBox = tester.renderObject<RenderBox>(
find.widgetWithText(Row, 'hint'),
);
// DropdownButton should be the height of the largest item
expect(dropdownButtonRenderBox.size.height, 100);
// DropdownButton should be width of largest item added to the icon size
expect(dropdownButtonRenderBox.size.width, 100 + 24.0);
},
);
testWidgets(
'Disabled button - Size of largest widget is used DropdownButton when selectedItemBuilder '
'is non-null and disabledHint is defined, but larger than largest selected item widget',
(WidgetTester tester) async {
final List<String> items = <String>['25', '50', '100'];
await tester.pumpWidget(buildFrame(
value: null,
// [hint] widget is larger than largest selected item widget
disabledHint: const SizedBox(
height: 125,
width: 125,
child: Text('hint'),
),
items: items,
itemHeight: null,
selectedItemBuilder: (BuildContext context) {
return items.map<Widget>((String item) {
return SizedBox(
height: double.parse(item),
width: double.parse(item),
child: Center(child: Text(item)),
);
}).toList();
},
));
final RenderBox dropdownButtonRenderBox = tester.renderObject<RenderBox>(
find.widgetWithText(Row, '25'),
);
// DropdownButton should be the height of the largest item (hint inclusive)
expect(dropdownButtonRenderBox.size.height, 125);
// DropdownButton should be width of largest item (hint inclusive) added to the icon size
expect(dropdownButtonRenderBox.size.width, 125 + 24.0);
},
);
testWidgets('Dropdown in middle showing middle item', (WidgetTester tester) async {
final List<DropdownMenuItem<int>> items = List<DropdownMenuItem<int>>.generate(
100,
(int i) => DropdownMenuItem<int>(value: i, child: Text('$i')),
);
final DropdownButton<int> button = DropdownButton<int>(
value: 50,
onChanged: (int? newValue) { },
items: items,
);
double getMenuScroll() {
double scrollPosition;
final ScrollController scrollController = PrimaryScrollController.of(tester.element(find.byType(ListView)))!;
assert(scrollController != null);
scrollPosition = scrollController.position.pixels;
assert(scrollPosition != null);
return scrollPosition;
}
await tester.pumpWidget(
MaterialApp(
home: Material(
child: Align(
child: button,
),
),
),
);
await tester.tap(find.text('50'));
await tester.pumpAndSettle();
expect(getMenuScroll(), 2180.0);
});
testWidgets('Dropdown in top showing bottom item', (WidgetTester tester) async {
final List<DropdownMenuItem<int>> items = List<DropdownMenuItem<int>>.generate(
100,
(int i) => DropdownMenuItem<int>(value: i, child: Text('$i')),
);
final DropdownButton<int> button = DropdownButton<int>(
value: 99,
onChanged: (int? newValue) { },
items: items,
);
double getMenuScroll() {
double scrollPosition;
final ScrollController scrollController = PrimaryScrollController.of(tester.element(find.byType(ListView)))!;
assert(scrollController != null);
scrollPosition = scrollController.position.pixels;
assert(scrollPosition != null);
return scrollPosition;
}
await tester.pumpWidget(
MaterialApp(
home: Material(
child: Align(
alignment: Alignment.topCenter,
child: button,
),
),
),
);
await tester.tap(find.text('99'));
await tester.pumpAndSettle();
expect(getMenuScroll(), 4312.0);
});
testWidgets('Dropdown in bottom showing top item', (WidgetTester tester) async {
final List<DropdownMenuItem<int>> items = List<DropdownMenuItem<int>>.generate(
100,
(int i) => DropdownMenuItem<int>(value: i, child: Text('$i')),
);
final DropdownButton<int> button = DropdownButton<int>(
value: 0,
onChanged: (int? newValue) { },
items: items,
);
double getMenuScroll() {
double scrollPosition;
final ScrollController scrollController = PrimaryScrollController.of(tester.element(find.byType(ListView)))!;
assert(scrollController != null);
scrollPosition = scrollController.position.pixels;
assert(scrollPosition != null);
return scrollPosition;
}
await tester.pumpWidget(
MaterialApp(
home: Material(
child: Align(
alignment: Alignment.bottomCenter,
child: button,
),
),
),
);
await tester.tap(find.text('0'));
await tester.pumpAndSettle();
expect(getMenuScroll(), 0.0);
});
testWidgets('Dropdown in center showing bottom item', (WidgetTester tester) async {
final List<DropdownMenuItem<int>> items = List<DropdownMenuItem<int>>.generate(
100,
(int i) => DropdownMenuItem<int>(value: i, child: Text('$i')),
);
final DropdownButton<int> button = DropdownButton<int>(
value: 99,
onChanged: (int? newValue) { },
items: items,
);
double getMenuScroll() {
double scrollPosition;
final ScrollController scrollController = PrimaryScrollController.of(tester.element(find.byType(ListView)))!;
assert(scrollController != null);
scrollPosition = scrollController.position.pixels;
assert(scrollPosition != null);
return scrollPosition;
}
await tester.pumpWidget(
MaterialApp(
home: Material(
child: Align(
child: button,
),
),
),
);
await tester.tap(find.text('99'));
await tester.pumpAndSettle();
expect(getMenuScroll(), 4312.0);
});
testWidgets('Dropdown menu respects parent size limits', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/24417
int? selectedIndex;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
bottomNavigationBar: const SizedBox(height: 200),
body: Navigator(
onGenerateRoute: (RouteSettings settings) {
return MaterialPageRoute<void>(
builder: (BuildContext context) {
return SafeArea(
child: Container(
alignment: Alignment.topLeft,
// From material/dropdown.dart (menus are unaligned by default):
// _kUnalignedMenuMargin = EdgeInsetsDirectional.only(start: 16.0, end: 24.0)
// This padding ensures that the entire menu will be visible
padding: const EdgeInsetsDirectional.only(start: 16.0, end: 24.0),
child: DropdownButton<int>(
value: 12,
onChanged: (int? i) {
selectedIndex = i;
},
items: List<DropdownMenuItem<int>>.generate(100, (int i) {
return DropdownMenuItem<int>(value: i, child: Text('$i'));
}),
),
),
);
},
);
},
),
),
),
);
await tester.tap(find.text('12'));
await tester.pumpAndSettle();
expect(selectedIndex, null);
await tester.tap(find.text('13').last);
await tester.pumpAndSettle();
expect(selectedIndex, 13);
});
testWidgets('Dropdown button will accept widgets as its underline', (WidgetTester tester) async {
const BoxDecoration decoration = BoxDecoration(
border: Border(bottom: BorderSide(color: Color(0xFFCCBB00), width: 4.0)),
);
const BoxDecoration defaultDecoration = BoxDecoration(
border: Border(bottom: BorderSide(color: Color(0xFFBDBDBD), width: 0.0)),
);
final Widget customUnderline = Container(height: 4.0, decoration: decoration);
final Key buttonKey = UniqueKey();
final Finder decoratedBox = find.descendant(
of: find.byKey(buttonKey),
matching: find.byType(DecoratedBox),
);
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
underline: customUnderline,
onChanged: onChanged,
));
expect(tester.widgetList<DecoratedBox>(decoratedBox).last.decoration, decoration);
await tester.pumpWidget(buildFrame(buttonKey: buttonKey, onChanged: onChanged));
expect(tester.widgetList<DecoratedBox>(decoratedBox).last.decoration, defaultDecoration);
});
testWidgets('DropdownButton selectedItemBuilder builds custom buttons', (WidgetTester tester) async {
const List<String> items = <String>[
'One',
'Two',
'Three',
];
String? selectedItem = items[0];
await tester.pumpWidget(
StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return MaterialApp(
home: Scaffold(
body: DropdownButton<String>(
value: selectedItem,
onChanged: (String? string) {
setState(() => selectedItem = string);
},
selectedItemBuilder: (BuildContext context) {
int index = 0;
return items.map((String string) {
index += 1;
return Text('$string as an Arabic numeral: $index');
}).toList();
},
items: items.map((String string) {
return DropdownMenuItem<String>(
value: string,
child: Text(string),
);
}).toList(),
),
),
);
},
),
);
expect(find.text('One as an Arabic numeral: 1'), findsOneWidget);
await tester.tap(find.text('One as an Arabic numeral: 1'));
await tester.pumpAndSettle();
await tester.tap(find.text('Two'));
await tester.pumpAndSettle();
expect(find.text('Two as an Arabic numeral: 2'), findsOneWidget);
});
testWidgets('DropdownButton uses default color when expanded', (WidgetTester tester) async {
await checkDropdownColor(tester);
});
testWidgets('DropdownButton uses dropdownColor when expanded', (WidgetTester tester) async {
await checkDropdownColor(tester, color: const Color.fromRGBO(120, 220, 70, 0.8));
});
testWidgets('DropdownButtonFormField uses dropdownColor when expanded', (WidgetTester tester) async {
await checkDropdownColor(tester, color: const Color.fromRGBO(120, 220, 70, 0.8), isFormField: true);
});
testWidgets('DropdownButton hint displays properly when selectedItemBuilder is defined', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/42340
final List<String> items = <String>['1', '2', '3'];
String? selectedItem;
await tester.pumpWidget(
StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return MaterialApp(
home: Scaffold(
body: DropdownButton<String>(
hint: const Text('Please select an item'),
value: selectedItem,
onChanged: (String? string) {
setState(() {
selectedItem = string;
});
},
selectedItemBuilder: (BuildContext context) {
return items.map((String item) {
return Text('You have selected: $item');
}).toList();
},
items: items.map((String item) {
return DropdownMenuItem<String>(
value: item,
child: Text(item),
);
}).toList(),
),
),
);
},
),
);
// Initially shows the hint text
expect(find.text('Please select an item'), findsOneWidget);
await tester.tap(find.text('Please select an item'), warnIfMissed: false);
await tester.pumpAndSettle();
await tester.tap(find.text('1'));
await tester.pumpAndSettle();
// Selecting an item should display its corresponding item builder
expect(find.text('You have selected: 1'), findsOneWidget);
});
testWidgets('Variable size and oversized menu items', (WidgetTester tester) async {
final List<double> itemHeights = <double>[30, 40, 50, 60];
double? dropdownValue = itemHeights[0];
Widget buildFrame() {
return MaterialApp(
home: Scaffold(
body: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DropdownButton<double>(
onChanged: (double? value) {
setState(() { dropdownValue = value; });
},
value: dropdownValue,
itemHeight: null,
items: itemHeights.map<DropdownMenuItem<double>>((double value) {
return DropdownMenuItem<double>(
key: ValueKey<double>(value),
value: value,
child: Center(
child: Container(
width: 100,
height: value,
color: Colors.blue,
),
),
);
}).toList(),
);
},
),
),
),
);
}
final Finder dropdownIcon = find.byType(Icon);
final Finder item30 = find.byKey(const ValueKey<double>(30));
final Finder item40 = find.byKey(const ValueKey<double>(40));
final Finder item50 = find.byKey(const ValueKey<double>(50));
final Finder item60 = find.byKey(const ValueKey<double>(60));
// Only the DropdownButton is visible. It contains the selected item
// and a dropdown arrow icon.
await tester.pumpWidget(buildFrame());
expect(dropdownIcon, findsOneWidget);
expect(item30, findsOneWidget);
// All menu items have a minimum height of 48. The centers of the
// dropdown icon and the selected menu item are vertically aligned
// and horizontally adjacent.
expect(tester.getSize(item30), const Size(100, 48));
expect(tester.getCenter(item30).dy, tester.getCenter(dropdownIcon).dy);
expect(tester.getTopRight(item30).dx, tester.getTopLeft(dropdownIcon).dx);
// Show the popup menu.
await tester.tap(item30);
await tester.pumpAndSettle();
// Each item appears twice, once in the menu and once
// in the dropdown button's IndexedStack.
expect(item30.evaluate().length, 2);
expect(item40.evaluate().length, 2);
expect(item50.evaluate().length, 2);
expect(item60.evaluate().length, 2);
// Verify that the items have the expected sizes. The width of the items
// that appear in the menu is padded by 16 on the left and right.
expect(tester.getSize(item30.first), const Size(100, 48));
expect(tester.getSize(item40.first), const Size(100, 48));
expect(tester.getSize(item50.first), const Size(100, 50));
expect(tester.getSize(item60.first), const Size(100, 60));
expect(tester.getSize(item30.last), const Size(132, 48));
expect(tester.getSize(item40.last), const Size(132, 48));
expect(tester.getSize(item50.last), const Size(132, 50));
expect(tester.getSize(item60.last), const Size(132, 60));
// The vertical center of the selectedItem (item30) should
// line up with its button counterpart.
expect(tester.getCenter(item30.first).dy, tester.getCenter(item30.last).dy);
// The menu items should be arranged in a column.
expect(tester.getBottomLeft(item30.last), tester.getTopLeft(item40.last));
expect(tester.getBottomLeft(item40.last), tester.getTopLeft(item50.last));
expect(tester.getBottomLeft(item50.last), tester.getTopLeft(item60.last));
// Dismiss the menu by selecting item40 and then show the menu again.
await tester.tap(item40.last);
await tester.pumpAndSettle();
expect(dropdownValue, 40);
await tester.tap(item40.first);
await tester.pumpAndSettle();
// The vertical center of the selectedItem (item40) should
// line up with its button counterpart.
expect(tester.getCenter(item40.first).dy, tester.getCenter(item40.last).dy);
});
testWidgets('DropdownButton menu items do not resize when its route is popped', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/44877.
const List<String> items = <String>[
'one',
'two',
'three',
];
String? item = items[0];
late MediaQueryData mediaQuery;
await tester.pumpWidget(
StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return MaterialApp(
builder: (BuildContext context, Widget? child) {
mediaQuery = MediaQuery.of(context);
return MediaQuery(
data: mediaQuery,
child: child!,
);
},
home: Scaffold(
body: DropdownButton<String>(
value: item,
items: items.map((String item) => DropdownMenuItem<String>(
value: item,
child: Text(item),
)).toList(),
onChanged: (String? newItem) {
setState(() {
item = newItem;
mediaQuery = mediaQuery.copyWith(
textScaleFactor: mediaQuery.textScaleFactor + 0.1,
);
});
},
),
),
);
},
),
);
// Verify that the first item is showing.
expect(find.text('one'), findsOneWidget);
// Select a different item to trigger setState, which updates mediaQuery
// and forces a performLayout on the popped _DropdownRoute. This operation
// should not cause an exception.
await tester.tap(find.text('one'));
await tester.pumpAndSettle();
await tester.tap(find.text('two').last);
await tester.pumpAndSettle();
expect(find.text('two'), findsOneWidget);
});
testWidgets('DropdownButton hint is selected item', (WidgetTester tester) async {
const double hintPaddingOffset = 8;
const List<String> itemValues = <String>['item0', 'item1', 'item2', 'item3'];
String? selectedItem = 'item0';
Widget buildFrame() {
return MaterialApp(
home: Scaffold(
body: ButtonTheme(
alignedDropdown: true,
child: DropdownButtonHideUnderline(
child: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
// The pretzel below is from an actual app. The price
// of limited configurability is keeping this working.
return DropdownButton<String>(
isExpanded: true,
elevation: 2,
hint: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
// Stack with a positioned widget is used to override the
// hard coded 16px margin in the dropdown code, so that
// this hint aligns "properly" with the menu.
return Stack(
clipBehavior: Clip.none,
alignment: Alignment.topCenter,
children: <Widget>[
PositionedDirectional(
width: constraints.maxWidth + hintPaddingOffset,
start: -hintPaddingOffset,
top: 4.0,
child: Text('-$selectedItem-'),
),
],
);
},
),
onChanged: (String? value) {
setState(() { selectedItem = value; });
},
icon: Container(),
items: itemValues.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
);
},
),
),
),
),
),
);
}
await tester.pumpWidget(buildFrame());
expect(tester.getTopLeft(find.text('-item0-')).dx, 8);
// Show the popup menu.
await tester.tap(find.text('-item0-'), warnIfMissed: false);
await tester.pumpAndSettle();
expect(tester.getTopLeft(find.text('-item0-')).dx, 8);
});
testWidgets('DropdownButton can be focused, and has focusColor', (WidgetTester tester) async {
tester.binding.focusManager.highlightStrategy = FocusHighlightStrategy.alwaysTraditional;
final UniqueKey buttonKey = UniqueKey();
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
await tester.pumpWidget(buildFrame(buttonKey: buttonKey, onChanged: onChanged, focusNode: focusNode, autofocus: true));
await tester.pumpAndSettle(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isTrue);
expect(find.byType(Material), paints..rect(rect: const Rect.fromLTRB(348.0, 276.0, 452.0, 324.0), color: const Color(0x1f000000)));
await tester.pumpWidget(buildFrame(buttonKey: buttonKey, onChanged: onChanged, focusNode: focusNode, focusColor: const Color(0xff00ff00)));
await tester.pumpAndSettle(); // Pump a frame for autofocus to take effect.
expect(find.byType(Material), paints..rect(rect: const Rect.fromLTRB(348.0, 276.0, 452.0, 324.0), color: const Color(0x1f00ff00)));
});
testWidgets('DropdownButtonFormField can be focused, and has focusColor', (WidgetTester tester) async {
tester.binding.focusManager.highlightStrategy = FocusHighlightStrategy.alwaysTraditional;
final UniqueKey buttonKey = UniqueKey();
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButtonFormField');
await tester.pumpWidget(buildFrame(isFormField: true, buttonKey: buttonKey, onChanged: onChanged, focusNode: focusNode, autofocus: true));
await tester.pumpAndSettle(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isTrue);
expect(find.byType(Material), paints ..rect(rect: const Rect.fromLTRB(0.0, 264.0, 800.0, 336.0), color: const Color(0x1f000000)));
await tester.pumpWidget(buildFrame(isFormField: true, buttonKey: buttonKey, onChanged: onChanged, focusNode: focusNode, focusColor: const Color(0xff00ff00)));
await tester.pumpAndSettle(); // Pump a frame for autofocus to take effect.
expect(find.byType(Material), paints ..rect(rect: const Rect.fromLTRB(0.0, 264.0, 800.0, 336.0), color: const Color(0x1f00ff00)));
});
testWidgets("DropdownButton won't be focused if not enabled", (WidgetTester tester) async {
final UniqueKey buttonKey = UniqueKey();
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
await tester.pumpWidget(buildFrame(buttonKey: buttonKey, focusNode: focusNode, autofocus: true, focusColor: const Color(0xff00ff00)));
await tester.pump(); // Pump a frame for autofocus to take effect (although it shouldn't).
expect(focusNode.hasPrimaryFocus, isFalse);
expect(find.byKey(buttonKey), isNot(paints ..rrect(rrect: const RRect.fromLTRBXY(0.0, 0.0, 104.0, 48.0, 4.0, 4.0), color: const Color(0xff00ff00))));
});
testWidgets('DropdownButton is activated with the enter key', (WidgetTester tester) async {
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
String? value = 'one';
Widget buildFrame() {
return MaterialApp(
home: Scaffold(
body: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DropdownButton<String>(
focusNode: focusNode,
autofocus: true,
onChanged: (String? newValue) {
setState(() {
value = newValue;
});
},
value: value,
itemHeight: null,
items: menuItems.map<DropdownMenuItem<String>>((String item) {
return DropdownMenuItem<String>(
key: ValueKey<String>(item),
value: item,
child: Text(item, key: ValueKey<String>('${item}Text')),
);
}).toList(),
);
},
),
),
),
);
}
await tester.pumpWidget(buildFrame());
await tester.pump(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isTrue);
await tester.sendKeyEvent(LogicalKeyboardKey.enter);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('one'));
await tester.sendKeyEvent(LogicalKeyboardKey.tab); // Focus 'two'
await tester.pump();
await tester.sendKeyEvent(LogicalKeyboardKey.enter); // Select 'two'.
await tester.pump();
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('two'));
});
// Regression test for https://github.com/flutter/flutter/issues/77655.
testWidgets('DropdownButton selecting a null valued item should be selected', (WidgetTester tester) async {
final List<MapEntry<String?, String>> items = <MapEntry<String?, String>>[
const MapEntry<String?, String>(null, 'None'),
const MapEntry<String?, String>('one', 'One'),
const MapEntry<String?, String>('two', 'Two'),
];
String? selectedItem = 'one';
await tester.pumpWidget(
StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return MaterialApp(
home: Scaffold(
body: DropdownButton<String>(
value: selectedItem,
onChanged: (String? string) {
setState(() {
selectedItem = string;
});
},
items: items.map((MapEntry<String?, String> item) {
return DropdownMenuItem<String>(
value: item.key,
child: Text(item.value),
);
}).toList(),
),
),
);
},
),
);
await tester.tap(find.text('One'));
await tester.pumpAndSettle();
await tester.tap(find.text('None').last);
await tester.pumpAndSettle();
expect(find.text('None'), findsOneWidget);
});
testWidgets('DropdownButton is activated with the space key', (WidgetTester tester) async {
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
String? value = 'one';
Widget buildFrame() {
return MaterialApp(
home: Scaffold(
body: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DropdownButton<String>(
focusNode: focusNode,
autofocus: true,
onChanged: (String? newValue) {
setState(() {
value = newValue;
});
},
value: value,
itemHeight: null,
items: menuItems.map<DropdownMenuItem<String>>((String item) {
return DropdownMenuItem<String>(
key: ValueKey<String>(item),
value: item,
child: Text(item, key: ValueKey<String>('${item}Text')),
);
}).toList(),
);
},
),
),
),
);
}
await tester.pumpWidget(buildFrame());
await tester.pump(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isTrue);
await tester.sendKeyEvent(LogicalKeyboardKey.space);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('one'));
await tester.sendKeyEvent(LogicalKeyboardKey.tab); // Focus 'two'
await tester.pump();
await tester.sendKeyEvent(LogicalKeyboardKey.space); // Select 'two'.
await tester.pump();
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('two'));
});
testWidgets('Selected element is focused when dropdown is opened', (WidgetTester tester) async {
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
String? value = 'one';
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DropdownButton<String>(
focusNode: focusNode,
autofocus: true,
onChanged: (String? newValue) {
setState(() {
value = newValue;
});
},
value: value,
itemHeight: null,
items: menuItems.map<DropdownMenuItem<String>>((String item) {
return DropdownMenuItem<String>(
key: ValueKey<String>(item),
value: item,
child: Text(item, key: ValueKey<String>('Text $item')),
);
}).toList(),
);
},
),
),
),
));
await tester.pump(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isTrue);
await tester.sendKeyEvent(LogicalKeyboardKey.enter);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu open animation
expect(value, equals('one'));
expect(Focus.of(tester.element(find.byKey(const ValueKey<String>('one')).last)).hasPrimaryFocus, isTrue);
await tester.sendKeyEvent(LogicalKeyboardKey.tab); // Focus 'two'
await tester.pump();
await tester.sendKeyEvent(LogicalKeyboardKey.enter); // Select 'two' and close the dropdown.
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu close animation
expect(value, equals('two'));
// Now make sure that "two" is focused when we re-open the dropdown.
await tester.sendKeyEvent(LogicalKeyboardKey.enter);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu open animation
expect(value, equals('two'));
final Element element = tester.element(find.byKey(const ValueKey<String>('two')).last);
final FocusNode node = Focus.of(element);
expect(node.hasFocus, isTrue);
});
testWidgets('Selected element is correctly focused with dropdown that more items than fit on the screen', (WidgetTester tester) async {
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
int? value = 1;
final List<int> hugeMenuItems = List<int>.generate(50, (int index) => index);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DropdownButton<int>(
focusNode: focusNode,
autofocus: true,
onChanged: (int? newValue) {
setState(() {
value = newValue;
});
},
value: value,
itemHeight: null,
items: hugeMenuItems.map<DropdownMenuItem<int>>((int item) {
return DropdownMenuItem<int>(
key: ValueKey<int>(item),
value: item,
child: Text(item.toString(), key: ValueKey<String>('Text $item')),
);
}).toList(),
);
},
),
),
),
),
);
await tester.pump(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isTrue);
await tester.sendKeyEvent(LogicalKeyboardKey.enter);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu open animation
expect(value, equals(1));
expect(Focus.of(tester.element(find.byKey(const ValueKey<int>(1)).last)).hasPrimaryFocus, isTrue);
for (int i = 0; i < 41; ++i) {
await tester.sendKeyEvent(LogicalKeyboardKey.tab); // Move to the next one.
await tester.pumpAndSettle(const Duration(milliseconds: 200)); // Wait for it to animate the menu.
}
await tester.sendKeyEvent(LogicalKeyboardKey.enter); // Select '42' and close the dropdown.
await tester.pumpAndSettle(const Duration(seconds: 1)); // Finish the menu close animation
expect(value, equals(42));
// Now make sure that "42" is focused when we re-open the dropdown.
await tester.sendKeyEvent(LogicalKeyboardKey.enter);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu open animation
expect(value, equals(42));
final Element element = tester.element(find.byKey(const ValueKey<int>(42)).last);
final FocusNode node = Focus.of(element);
expect(node.hasFocus, isTrue);
});
testWidgets("Having a focused element doesn't interrupt scroll when flung by touch", (WidgetTester tester) async {
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
int? value = 1;
final List<int> hugeMenuItems = List<int>.generate(100, (int index) => index);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DropdownButton<int>(
focusNode: focusNode,
autofocus: true,
onChanged: (int? newValue) {
setState(() {
value = newValue;
});
},
value: value,
itemHeight: null,
items: hugeMenuItems.map<DropdownMenuItem<int>>((int item) {
return DropdownMenuItem<int>(
key: ValueKey<int>(item),
value: item,
child: Text(item.toString(), key: ValueKey<String>('Text $item')),
);
}).toList(),
);
},
),
),
),
),
);
await tester.pump(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isTrue);
await tester.sendKeyEvent(LogicalKeyboardKey.enter);
await tester.pumpAndSettle();
expect(value, equals(1));
expect(Focus.of(tester.element(find.byKey(const ValueKey<int>(1)).last)).hasPrimaryFocus, isTrue);
// Move to an item very far down the menu.
for (int i = 0; i < 90; ++i) {
await tester.sendKeyEvent(LogicalKeyboardKey.tab); // Move to the next one.
await tester.pumpAndSettle(); // Wait for it to animate the menu.
}
expect(Focus.of(tester.element(find.byKey(const ValueKey<int>(91)).last)).hasPrimaryFocus, isTrue);
// Scroll back to the top using touch, and make sure we end up there.
final Finder menu = find.byWidgetPredicate((Widget widget) {
return widget.runtimeType.toString().startsWith('_DropdownMenu<');
});
final Rect menuRect = tester.getRect(menu).shift(tester.getTopLeft(menu));
for (int i = 0; i < 10; ++i) {
await tester.fling(menu, Offset(0.0, menuRect.height), 10.0);
}
await tester.pumpAndSettle();
// Make sure that we made it to the top and something didn't stop the
// scroll.
expect(find.byKey(const ValueKey<int>(1)), findsNWidgets(2));
expect(
tester.getRect(find.byKey(const ValueKey<int>(1)).last),
equals(const Rect.fromLTRB(372.0, 104.0, 436.0, 152.0)),
);
// Scrolling to the top again has removed the one the focus was on from the
// tree, causing it to lose focus.
expect(Focus.of(tester.element(find.byKey(const ValueKey<int>(91)).last)).hasPrimaryFocus, isFalse);
});
testWidgets('DropdownButton onTap callback can request focus', (WidgetTester tester) async {
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton')..addListener(() { });
int? value = 1;
final List<int> hugeMenuItems = List<int>.generate(100, (int index) => index);
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DropdownButton<int>(
focusNode: focusNode,
onChanged: (int? newValue) {
setState(() {
value = newValue;
});
},
value: value,
itemHeight: null,
items: hugeMenuItems.map<DropdownMenuItem<int>>((int item) {
return DropdownMenuItem<int>(
key: ValueKey<int>(item),
value: item,
child: Text(item.toString()),
);
}).toList(),
);
},
),
),
),
),
);
await tester.pump(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isFalse);
await tester.tap(find.text('1'));
await tester.pumpAndSettle();
// Close the dropdown menu.
await tester.tapAt(const Offset(1.0, 1.0));
await tester.pumpAndSettle();
expect(focusNode.hasPrimaryFocus, isTrue);
});
testWidgets('DropdownButton changes selected item with arrow keys', (WidgetTester tester) async {
final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
String? value = 'one';
Widget buildFrame() {
return MaterialApp(
home: Scaffold(
body: Center(
child: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return DropdownButton<String>(
focusNode: focusNode,
autofocus: true,
onChanged: (String? newValue) {
setState(() {
value = newValue;
});
},
value: value,
itemHeight: null,
items: menuItems.map<DropdownMenuItem<String>>((String item) {
return DropdownMenuItem<String>(
key: ValueKey<String>(item),
value: item,
child: Text(item, key: ValueKey<String>('${item}Text')),
);
}).toList(),
);
},
),
),
),
);
}
await tester.pumpWidget(buildFrame());
await tester.pump(); // Pump a frame for autofocus to take effect.
expect(focusNode.hasPrimaryFocus, isTrue);
await tester.sendKeyEvent(LogicalKeyboardKey.enter);
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('one'));
await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown); // Focus 'two'.
await tester.pump();
await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown); // Focus 'three'.
await tester.pump();
await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp); // Back to 'two'.
await tester.pump();
await tester.sendKeyEvent(LogicalKeyboardKey.enter); // Select 'two'.
await tester.pump();
await tester.pump();
await tester.pump(const Duration(seconds: 1)); // finish the menu animation
expect(value, equals('two'));
});
testWidgets('DropdownButton onTap callback is called when defined', (WidgetTester tester) async {
int dropdownButtonTapCounter = 0;
String? value = 'one';
void onChanged(String? newValue) { value = newValue; }
void onTap() { dropdownButtonTapCounter += 1; }
Widget build() => buildFrame(
value: value,
onChanged: onChanged,
onTap: onTap,
);
await tester.pumpWidget(build());
expect(dropdownButtonTapCounter, 0);
// Tap dropdown button.
await tester.tap(find.text('one'));
await tester.pumpAndSettle();
expect(value, equals('one'));
expect(dropdownButtonTapCounter, 1); // Should update counter.
// Tap dropdown menu item.
await tester.tap(find.text('three').last);
await tester.pumpAndSettle();
expect(value, equals('three'));
expect(dropdownButtonTapCounter, 1); // Should not change.
// Tap dropdown button again.
await tester.tap(find.text('three'), warnIfMissed: false);
await tester.pumpAndSettle();
expect(value, equals('three'));
expect(dropdownButtonTapCounter, 2); // Should update counter.
// Tap dropdown menu item.
await tester.tap(find.text('two').last);
await tester.pumpAndSettle();
expect(value, equals('two'));
expect(dropdownButtonTapCounter, 2); // Should not change.
});
testWidgets('DropdownMenuItem onTap callback is called when defined', (WidgetTester tester) async {
String? value = 'one';
final List<int> menuItemTapCounters = <int>[0, 0, 0, 0];
void onChanged(String? newValue) { value = newValue; }
final List<VoidCallback> onTapCallbacks = <VoidCallback>[
() { menuItemTapCounters[0] += 1; },
() { menuItemTapCounters[1] += 1; },
() { menuItemTapCounters[2] += 1; },
() { menuItemTapCounters[3] += 1; },
];
int currentIndex = -1;
await tester.pumpWidget(
TestApp(
textDirection: TextDirection.ltr,
child: Material(
child: RepaintBoundary(
child: DropdownButton<String>(
value: value,
onChanged: onChanged,
items: menuItems.map<DropdownMenuItem<String>>((String item) {
currentIndex += 1;
return DropdownMenuItem<String>(
value: item,
onTap: onTapCallbacks[currentIndex],
child: Text(item),
);
}).toList(),
),
),
),
),
);
// Tap dropdown button.
await tester.tap(find.text('one'));
await tester.pumpAndSettle();
expect(value, equals('one'));
// Counters should still be zero.
expect(menuItemTapCounters, <int>[0, 0, 0, 0]);
// Tap dropdown menu item.
await tester.tap(find.text('three').last);
await tester.pumpAndSettle();
// Should update the counter for the third item (second index).
expect(value, equals('three'));
expect(menuItemTapCounters, <int>[0, 0, 1, 0]);
// Tap dropdown button again.
await tester.tap(find.text('three'), warnIfMissed: false);
await tester.pumpAndSettle();
// Should not change.
expect(value, equals('three'));
expect(menuItemTapCounters, <int>[0, 0, 1, 0]);
// Tap dropdown menu item.
await tester.tap(find.text('two').last);
await tester.pumpAndSettle();
// Should update the counter for the second item (first index).
expect(value, equals('two'));
expect(menuItemTapCounters, <int>[0, 1, 1, 0]);
// Tap dropdown button again.
await tester.tap(find.text('two'), warnIfMissed: false);
await tester.pumpAndSettle();
// Should not change.
expect(value, equals('two'));
expect(menuItemTapCounters, <int>[0, 1, 1, 0]);
// Tap the already selected menu item
await tester.tap(find.text('two').last);
await tester.pumpAndSettle();
// Should update the counter for the second item (first index), even
// though it was already selected.
expect(value, equals('two'));
expect(menuItemTapCounters, <int>[0, 2, 1, 0]);
});
testWidgets('Does not crash when option is selected without waiting for opening animation to complete', (WidgetTester tester) async {
// Regression test for b/171846624.
final List<String> options = <String>['first', 'second', 'third'];
String? value = options.first;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) => DropdownButton<String>(
value: value,
items: options.map((String s) => DropdownMenuItem<String>(
value: s,
child: Text(s),
)).toList(),
onChanged: (String? v) {
setState(() {
value = v;
});
},
),
),
),
),
);
expect(find.text('first').hitTestable(), findsOneWidget);
expect(find.text('second').hitTestable(), findsNothing);
expect(find.text('third').hitTestable(), findsNothing);
// Open dropdown.
await tester.tap(find.text('first').hitTestable());
await tester.pump();
expect(find.text('third').hitTestable(), findsOneWidget);
expect(find.text('first').hitTestable(), findsOneWidget);
expect(find.text('second').hitTestable(), findsOneWidget);
// Deliberately not waiting for opening animation to complete!
// Select an option in dropdown.
await tester.tap(find.text('third').hitTestable());
await tester.pump();
expect(find.text('third').hitTestable(), findsOneWidget);
expect(find.text('first').hitTestable(), findsNothing);
expect(find.text('second').hitTestable(), findsNothing);
});
testWidgets('Dropdown menu should persistently show a scrollbar if it is scrollable', (WidgetTester tester) async {
await tester.pumpWidget(buildFrame(
value: '0',
// menu is short enough to fit onto the screen.
items: List<String>.generate(/*length=*/10, (int index) => index.toString()),
onChanged: onChanged,
));
await tester.tap(find.text('0'));
await tester.pumpAndSettle();
ScrollController scrollController = PrimaryScrollController.of(tester.element(find.byType(ListView)))!;
// The scrollbar shouldn't show if the list fits into the screen.
expect(scrollController.position.maxScrollExtent, 0);
expect(find.byType(Scrollbar), isNot(paints..rect()));
await tester.tap(find.text('0').last);
await tester.pumpAndSettle();
await tester.pumpWidget(buildFrame(
value: '0',
// menu is too long to fit onto the screen.
items: List<String>.generate(/*length=*/100, (int index) => index.toString()),
onChanged: onChanged,
));
await tester.tap(find.text('0'));
await tester.pumpAndSettle();
scrollController = PrimaryScrollController.of(tester.element(find.byType(ListView)))!;
// The scrollbar is shown when the list is longer than the height of the screen.
expect(scrollController.position.maxScrollExtent > 0, isTrue);
expect(find.byType(Scrollbar), paints..rect());
});
testWidgets("Dropdown menu's maximum height should be influenced by DropdownButton.menuMaxHeight.", (WidgetTester tester) async {
await tester.pumpWidget(buildFrame(
value: '0',
items: List<String>.generate(/*length=*/64, (int index) => index.toString()),
onChanged: onChanged,
));
await tester.tap(find.text('0'));
await tester.pumpAndSettle();
final Element element = tester.element(find.byType(ListView));
double menuHeight = element.size!.height;
// The default maximum height should be one item height from the edge.
// https://material.io/design/components/menus.html#usage
final double mediaHeight = MediaQuery.of(element).size.height;
final double defaultMenuHeight = mediaHeight - (2 * kMinInteractiveDimension);
expect(menuHeight, defaultMenuHeight);
await tester.tap(find.text('0').last);
await tester.pumpAndSettle();
// Set menuMaxHeight which is less than defaultMenuHeight
await tester.pumpWidget(buildFrame(
value: '0',
items: List<String>.generate(/*length=*/64, (int index) => index.toString()),
onChanged: onChanged,
menuMaxHeight: 7 * kMinInteractiveDimension,
));
await tester.tap(find.text('0'));
await tester.pumpAndSettle();
menuHeight = tester.element(find.byType(ListView)).size!.height;
expect(menuHeight == defaultMenuHeight, isFalse);
expect(menuHeight, kMinInteractiveDimension * 7);
await tester.tap(find.text('0').last);
await tester.pumpAndSettle();
// Set menuMaxHeight which is greater than defaultMenuHeight
await tester.pumpWidget(buildFrame(
value: '0',
items: List<String>.generate(/*length=*/64, (int index) => index.toString()),
onChanged: onChanged,
menuMaxHeight: mediaHeight,
));
await tester.tap(find.text('0'));
await tester.pumpAndSettle();
menuHeight = tester.element(find.byType(ListView)).size!.height;
expect(menuHeight, defaultMenuHeight);
});
// Regression test for https://github.com/flutter/flutter/issues/89029
testWidgets('menu position test with `menuMaxHeight`', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
value: '6',
items: List<String>.generate(/*length=*/64, (int index) => index.toString()),
onChanged: onChanged,
menuMaxHeight: 2 * kMinInteractiveDimension,
));
await tester.tap(find.text('6'));
await tester.pumpAndSettle();
final RenderBox menuBox = tester.renderObject(find.byType(ListView));
final RenderBox buttonBox = tester.renderObject(find.byKey(buttonKey));
// The menu's bottom should align with the drop-button's bottom.
expect(
menuBox.localToGlobal(menuBox.paintBounds.bottomCenter).dy,
buttonBox.localToGlobal(buttonBox.paintBounds.bottomCenter).dy,
);
});
// Regression test for https://github.com/flutter/flutter/issues/76614
testWidgets('Do not crash if used in very short screen', (WidgetTester tester) async {
// The default item height is 48.0 pixels and needs two items padding since
// the menu requires empty space surrounding the menu. Finally, the constraint height
// is 47.0 pixels for the menu rendering.
tester.binding.window.physicalSizeTestValue = const Size(800.0, 48.0 * 3 - 1.0);
tester.binding.window.devicePixelRatioTestValue = 1;
addTearDown(tester.binding.window.clearPhysicalSizeTestValue);
addTearDown(tester.binding.window.clearDevicePixelRatioTestValue);
const String value = 'foo';
final UniqueKey itemKey = UniqueKey();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: DropdownButton<String>(
value: value,
items: <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
key: itemKey,
value: value,
child: const Text(value),
),
],
onChanged: (_) { },
),
),
),
),
);
await tester.tap(find.text(value));
await tester.pumpAndSettle();
final List<RenderBox> itemBoxes = tester.renderObjectList<RenderBox>(find.byKey(itemKey)).toList();
expect(itemBoxes[0].localToGlobal(Offset.zero).dx, 364.0);
expect(itemBoxes[0].localToGlobal(Offset.zero).dy, 47.5);
expect(itemBoxes[1].localToGlobal(Offset.zero).dx, 364.0);
expect(itemBoxes[1].localToGlobal(Offset.zero).dy, 47.5);
expect(
find.ancestor(
of: find.text(value).last,
matching: find.byType(CustomPaint),
).at(2),
paints
..save()
..rrect()
..rrect()
..rrect()
// The height of menu is 47.0.
..rrect(rrect: const RRect.fromLTRBXY(0.0, 0.0, 112.0, 47.0, 2.0, 2.0), color: Colors.grey[50], hasMaskFilter: false),
);
});
testWidgets('Tapping a disabled item should not close DropdownButton', (WidgetTester tester) async {
String? value = 'first';
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) => DropdownButton<String>(
value: value,
items: const <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
enabled: false,
child: Text('disabled'),
),
DropdownMenuItem<String>(
value: 'first',
child: Text('first'),
),
DropdownMenuItem<String>(
value: 'second',
child: Text('second'),
),
],
onChanged: (String? newValue) {
setState(() {
value = newValue;
});
},
),
),
),
),
);
// Open dropdown.
await tester.tap(find.text('first').hitTestable());
await tester.pumpAndSettle();
// Tap on a disabled item.
await tester.tap(find.text('disabled').hitTestable());
await tester.pumpAndSettle();
// The dropdown should still be open, i.e., there should be one widget with 'second' text.
expect(find.text('second').hitTestable(), findsOneWidget);
});
testWidgets('Disabled item should not be focusable', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: DropdownButton<String>(
value: 'enabled',
onChanged: onChanged,
items: const <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
enabled: false,
child: Text('disabled'),
),
DropdownMenuItem<String>(
value: 'enabled',
child: Text('enabled'),
),
],
),
),
),
);
// Open dropdown.
await tester.tap(find.text('enabled').hitTestable());
await tester.pumpAndSettle();
// The `FocusNode` of [disabledItem] should be `null` as enabled is false.
final Element disabledItem = tester.element(find.text('disabled').hitTestable());
expect(Focus.maybeOf(disabledItem), null, reason: 'Disabled menu item should not be able to request focus');
});
testWidgets('alignment test', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
Widget buildFrame({AlignmentGeometry? buttonAlignment, AlignmentGeometry? menuAlignment}) {
return MaterialApp(
home: Scaffold(
body: Center(
child: DropdownButton<String>(
key: buttonKey,
alignment: buttonAlignment ?? AlignmentDirectional.centerStart,
value: 'enabled',
onChanged: onChanged,
items: <DropdownMenuItem<String>>[
DropdownMenuItem<String>(
alignment: buttonAlignment ?? AlignmentDirectional.centerStart,
enabled: false,
child: const Text('disabled'),
),
DropdownMenuItem<String>(
alignment: buttonAlignment ?? AlignmentDirectional.centerStart,
value: 'enabled',
child: const Text('enabled'),
),
],
),
),
),
);
}
await tester.pumpWidget(buildFrame());
final RenderBox buttonBox = tester.renderObject(find.byKey(buttonKey));
RenderBox selectedItemBox = tester.renderObject(find.text('enabled'));
// Default to center-start aligned.
expect(
buttonBox.localToGlobal(Offset(0.0, buttonBox.size.height / 2.0)),
selectedItemBox.localToGlobal(Offset(0.0, selectedItemBox.size.height / 2.0)),
);
await tester.pumpWidget(buildFrame(
buttonAlignment: AlignmentDirectional.center,
menuAlignment: AlignmentDirectional.center,
));
selectedItemBox = tester.renderObject(find.text('enabled'));
// Should be center-center aligned, the icon size is 24.0 pixels.
expect(
buttonBox.localToGlobal(Offset((buttonBox.size.width -24.0) / 2.0, buttonBox.size.height / 2.0)),
selectedItemBox.localToGlobal(Offset(selectedItemBox.size.width / 2.0, selectedItemBox.size.height / 2.0)),
);
// Open dropdown.
await tester.tap(find.text('enabled').hitTestable());
await tester.pumpAndSettle();
final RenderBox selectedItemBoxInMenu = tester.renderObjectList<RenderBox>(find.text('enabled')).toList()[1];
final Finder menu = find.byWidgetPredicate((Widget widget) {
return widget.runtimeType.toString().startsWith('_DropdownMenu<');
});
final Rect menuRect = tester.getRect(menu);
final Offset center = selectedItemBoxInMenu.localToGlobal(
Offset(selectedItemBoxInMenu.size.width / 2.0, selectedItemBoxInMenu.size.height / 2.0)
);
expect(center.dx, menuRect.topCenter.dx,);
expect(
center.dy,
selectedItemBox.localToGlobal(Offset(selectedItemBox.size.width / 2.0, selectedItemBox.size.height / 2.0)).dy,
);
});
group('feedback', () {
late FeedbackTester feedback;
setUp(() {
feedback = FeedbackTester();
});
tearDown(() {
feedback.dispose();
});
Widget feedbackBoilerplate({bool? enableFeedback}) {
return MaterialApp(
home : Material(
child: DropdownButton<String>(
value: 'One',
enableFeedback: enableFeedback,
underline: Container(
height: 2,
color: Colors.deepPurpleAccent,
),
onChanged: (String? value) {},
items: <String>['One', 'Two'].map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
),
),
);
}
testWidgets('Dropdown with enabled feedback', (WidgetTester tester) async {
const bool enableFeedback = true;
await tester.pumpWidget(feedbackBoilerplate(enableFeedback: enableFeedback));
await tester.tap(find.text('One'));
await tester.pumpAndSettle();
await tester.tap(find.widgetWithText(InkWell, 'One').last);
await tester.pumpAndSettle();
expect(feedback.clickSoundCount, 1);
expect(feedback.hapticCount, 0);
});
testWidgets('Dropdown with disabled feedback', (WidgetTester tester) async {
const bool enableFeedback = false;
await tester.pumpWidget(feedbackBoilerplate(enableFeedback: enableFeedback));
await tester.tap(find.text('One'));
await tester.pumpAndSettle();
await tester.tap(find.widgetWithText(InkWell, 'One').last);
await tester.pumpAndSettle();
expect(feedback.clickSoundCount, 0);
expect(feedback.hapticCount, 0);
});
testWidgets('Dropdown with enabled feedback by default', (WidgetTester tester) async {
await tester.pumpWidget(feedbackBoilerplate());
await tester.tap(find.text('One'));
await tester.pumpAndSettle();
await tester.tap(find.widgetWithText(InkWell, 'Two').last);
await tester.pumpAndSettle();
expect(feedback.clickSoundCount, 1);
expect(feedback.hapticCount, 0);
});
});
testWidgets('DropdownButton changes mouse cursor when hovered', (WidgetTester tester) async {
const Key key = Key('testDropdownButton');
await tester.pumpWidget(
MaterialApp(
home: Material(
child: DropdownButton<String>(
key: key,
onChanged: (String? newValue) {},
items: <String>['One', 'Two', 'Three', 'Four']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList()
),
),
),
);
final Finder dropdownButtonFinder = find.byKey(key);
final Offset onDropdownButton = tester.getCenter(dropdownButtonFinder);
final Offset offDropdownButton = tester.getBottomRight(dropdownButtonFinder) + const Offset(1, 1);
final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse, pointer: 1);
await gesture.addPointer(location: onDropdownButton);
await tester.pump();
expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.click);
await gesture.moveTo(offDropdownButton);
expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.basic);
// Test that mouse cursor doesn't change when button is disabled
await tester.pumpWidget(
MaterialApp(
home: Material(
child: DropdownButton<String>(
key: key,
onChanged: null,
items: <String>['One', 'Two', 'Three', 'Four']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
),
),
),
);
await gesture.moveTo(onDropdownButton);
expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.basic);
await gesture.moveTo(offDropdownButton);
expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.basic);
});
testWidgets('Conflicting scrollbars are not applied by ScrollBehavior to Dropdown', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/83819
// Open the dropdown menu
final Key buttonKey = UniqueKey();
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
value: null, // nothing selected
items: List<String>.generate(100, (int index) => index.toString()),
onChanged: onChanged,
));
await tester.tap(find.byKey(buttonKey));
await tester.pump();
await tester.pumpAndSettle(); // finish the menu animation
// The inherited ScrollBehavior should not apply Scrollbars since they are
// already built in to the widget.
expect(find.byType(CupertinoScrollbar), findsNothing);
expect(find.byType(Scrollbar), findsOneWidget);
expect(find.byType(RawScrollbar), findsNothing);
}, variant: TargetPlatformVariant.all());
testWidgets('borderRadius property works properly', (WidgetTester tester) async {
const double radius = 20.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: DropdownButton<String>(
borderRadius: BorderRadius.circular(radius),
value: 'One',
items: <String>['One', 'Two', 'Three', 'Four']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
onChanged: (_) { },
),
),
),
),
);
await tester.tap(find.text('One'));
await tester.pumpAndSettle();
expect(
find.ancestor(
of: find.text('One').last,
matching: find.byType(CustomPaint),
).at(2),
paints
..save()
..rrect()
..rrect()
..rrect()
..rrect(rrect: const RRect.fromLTRBXY(0.0, 0.0, 144.0, 208.0, radius, radius)),
);
});
// Regression test for https://github.com/flutter/flutter/issues/88574
testWidgets("specifying itemHeight affects popup menu items' height", (WidgetTester tester) async {
const String value = 'One';
const double itemHeight = 80;
final List<DropdownMenuItem<String>> menuItems = <String>[
value,
'Two',
'Free',
'Four',
].map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: DropdownButton<String>(
value: value,
itemHeight: itemHeight,
onChanged: (_) {},
items: menuItems,
),
),
),
),
);
await tester.tap(find.text(value));
await tester.pumpAndSettle();
for (final DropdownMenuItem<String> item in menuItems) {
final Iterable<Element> elements = tester.elementList(find.byWidget(item));
for (final Element element in elements){
expect(element.size!.height, itemHeight);
}
}
});
// Regression test for https://github.com/flutter/flutter/issues/92438
testWidgets('Do not throw due to the double precision', (WidgetTester tester) async {
const String value = 'One';
const double itemHeight = 77.701;
final List<DropdownMenuItem<String>> menuItems = <String>[
value,
'Two',
'Free',
].map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: DropdownButton<String>(
value: value,
itemHeight: itemHeight,
onChanged: (_) {},
items: menuItems,
),
),
),
),
);
await tester.tap(find.text(value));
await tester.pumpAndSettle();
expect(tester.takeException(), null);
});
testWidgets('BorderRadius property works properly for DropdownButtonFormField', (WidgetTester tester) async {
const double radius = 20.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: DropdownButtonFormField<String>(
borderRadius: BorderRadius.circular(radius),
value: 'One',
items: <String>['One', 'Two', 'Three', 'Four']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
onChanged: (_) { },
),
),
),
),
);
await tester.tap(find.text('One'));
await tester.pumpAndSettle();
expect(
find.ancestor(
of: find.text('One').last,
matching: find.byType(CustomPaint),
).at(2),
paints
..save()
..rrect()
..rrect()
..rrect()
..rrect(rrect: const RRect.fromLTRBXY(0.0, 0.0, 800.0, 208.0, radius, radius)),
);
});
testWidgets('DropdownButton hint alignment', (WidgetTester tester) async {
final Key buttonKey = UniqueKey();
const String hintText = 'hint';
// DropdownButton with `isExpanded: false` (default)
// AlignmentDirectional.centerStart (default)
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
itemHeight: 100.0,
hint: const Text(hintText)),
);
expect(tester.getTopLeft(find.text(hintText)).dx, 348.0);
expect(tester.getTopLeft(find.text(hintText)).dy, 292.0);
// AlignmentDirectional.topStart
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
alignment: AlignmentDirectional.topStart,
itemHeight: 100.0,
hint: const Text(hintText)),
);
expect(tester.getTopLeft(find.text(hintText)).dx, 348.0);
expect(tester.getTopLeft(find.text(hintText)).dy, 250.0);
// AlignmentDirectional.bottomStart
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
alignment: AlignmentDirectional.bottomStart,
itemHeight: 100.0,
hint: const Text(hintText)),
);
expect(tester.getBottomLeft(find.text(hintText)).dx, 348.0);
expect(tester.getBottomLeft(find.text(hintText)).dy, 350.0);
// AlignmentDirectional.center
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
alignment: AlignmentDirectional.center,
itemHeight: 100.0,
hint: const Text(hintText)),
);
expect(tester.getCenter(find.text(hintText)).dx, 388.0);
expect(tester.getCenter(find.text(hintText)).dy, 300.0);
// AlignmentDirectional.topEnd
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
alignment: AlignmentDirectional.topEnd,
itemHeight: 100.0,
hint: const Text(hintText)),
);
expect(tester.getTopRight(find.text(hintText)).dx, 428.0);
expect(tester.getTopRight(find.text(hintText)).dy, 250.0);
// AlignmentDirectional.centerEnd
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
alignment: AlignmentDirectional.centerEnd,
itemHeight: 100.0,
hint: const Text(hintText)),
);
expect(tester.getTopRight(find.text(hintText)).dx, 428.0);
expect(tester.getTopRight(find.text(hintText)).dy, 292.0);
// AlignmentDirectional.topEnd
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
alignment: AlignmentDirectional.bottomEnd,
itemHeight: 100.0,
hint: const Text(hintText)),
);
expect(tester.getTopRight(find.text(hintText)).dx, 428.0);
expect(tester.getTopRight(find.text(hintText)).dy, 334.0);
// DropdownButton with `isExpanded: true`
// AlignmentDirectional.centerStart (default)
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
itemHeight: 100.0,
isExpanded: true,
hint: const Text(hintText)),
);
expect(tester.getTopLeft(find.text(hintText)).dx, 0.0);
expect(tester.getTopLeft(find.text(hintText)).dy, 292.0);
// AlignmentDirectional.topStart
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
itemHeight: 100.0,
isExpanded: true,
alignment: AlignmentDirectional.topStart,
hint: const Text(hintText)),
);
expect(tester.getTopLeft(find.text(hintText)).dx, 0.0);
expect(tester.getTopLeft(find.text(hintText)).dy, 250.0);
// AlignmentDirectional.bottomStart
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
itemHeight: 100.0,
isExpanded: true,
alignment: AlignmentDirectional.bottomStart,
hint: const Text(hintText)),
);
expect(tester.getBottomLeft(find.text(hintText)).dx, 0.0);
expect(tester.getBottomLeft(find.text(hintText)).dy, 350.0);
// AlignmentDirectional.center
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
itemHeight: 100.0,
isExpanded: true,
alignment: AlignmentDirectional.center,
hint: const Text(hintText)),
);
expect(tester.getCenter(find.text(hintText)).dx, 388.0);
expect(tester.getCenter(find.text(hintText)).dy, 300.0);
// AlignmentDirectional.topEnd
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
itemHeight: 100.0,
isExpanded: true,
alignment: AlignmentDirectional.topEnd,
hint: const Text(hintText)),
);
expect(tester.getTopRight(find.text(hintText)).dx, 776.0);
expect(tester.getTopRight(find.text(hintText)).dy, 250.0);
// AlignmentDirectional.centerEnd
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
itemHeight: 100.0,
isExpanded: true,
alignment: AlignmentDirectional.centerEnd,
hint: const Text(hintText)),
);
expect(tester.getTopRight(find.text(hintText)).dx, 776.0);
expect(tester.getTopRight(find.text(hintText)).dy, 292.0);
// AlignmentDirectional.bottomEnd
await tester.pumpWidget(buildFrame(
buttonKey: buttonKey,
mediaSize: const Size(800, 600),
itemHeight: 100.0,
isExpanded: true,
alignment: AlignmentDirectional.bottomEnd,
hint: const Text(hintText)),
);
expect(tester.getBottomRight(find.text(hintText)).dx, 776.0);
expect(tester.getBottomRight(find.text(hintText)).dy, 350.0);
});
testWidgets('BorderRadius property clips dropdown button and dropdown menu', (WidgetTester tester) async {
const double radius = 20.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: DropdownButtonFormField<String>(
borderRadius: BorderRadius.circular(radius),
value: 'One',
items: <String>['One', 'Two', 'Three', 'Four']
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value,
child: Text(value),
);
}).toList(),
onChanged: (_) { },
),
),
),
),
);
final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
await gesture.addPointer();
await gesture.moveTo(tester.getCenter(find.byType(DropdownButtonFormField<String>)));
await tester.pumpAndSettle();
final RenderObject inkFeatures = tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');
expect(inkFeatures, paints..rrect(rrect: RRect.fromLTRBR(0.0, 276.0, 800.0, 324.0, const Radius.circular(radius))));
await tester.tap(find.text('One'));
await tester.pumpAndSettle();
final RenderClipRRect renderClip = tester.allRenderObjects.whereType<RenderClipRRect>().first;
expect(renderClip.borderRadius, BorderRadius.circular(radius));
});
}