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flutter / mirrors / flutter / 4119210e733f74308a20e786393edb591dddd019 / . / packages / flutter / test / material / snack_bar_test.dart
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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file is run as part of a reduced test set in CI on Mac and Windows
// machines.
@Tags(<String>['reduced-test-set'])
import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('SnackBar control test', (WidgetTester tester) async {
const String helloSnackBar = 'Hello SnackBar';
const Key tapTarget = Key('tap-target');
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
key: tapTarget,
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
content: Text(helloSnackBar),
duration: Duration(seconds: 2),
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
);
},
),
),
));
expect(find.text(helloSnackBar), findsNothing);
await tester.tap(find.byKey(tapTarget));
expect(find.text(helloSnackBar), findsNothing);
await tester.pump(); // schedule animation
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(); // begin animation
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 0.75s // animation last frame; two second timer starts here
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 1.50s
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 2.25s
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 3.00s // timer triggers to dismiss snackbar, reverse animation is scheduled
await tester.pump(); // begin animation
expect(find.text(helloSnackBar), findsOneWidget); // frame 0 of dismiss animation
await tester.pump(const Duration(milliseconds: 750)); // 3.75s // last frame of animation, snackbar removed from build
expect(find.text(helloSnackBar), findsNothing);
});
testWidgets('SnackBar twice test', (WidgetTester tester) async {
int snackBarCount = 0;
const Key tapTarget = Key('tap-target');
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
key: tapTarget,
onTap: () {
snackBarCount += 1;
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text('bar$snackBarCount'),
duration: const Duration(seconds: 2),
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
);
},
),
),
));
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
await tester.tap(find.byKey(tapTarget)); // queue bar1
await tester.tap(find.byKey(tapTarget)); // queue bar2
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
await tester.pump(); // schedule animation for bar1
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(); // begin animation
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 0.75s // animation last frame; two second timer starts here
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 1.50s
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 2.25s
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 3.00s // timer triggers to dismiss snackbar, reverse animation is scheduled
await tester.pump(); // begin animation
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 3.75s // last frame of animation, snackbar removed from build, new snack bar put in its place
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(); // begin animation
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 4.50s // animation last frame; two second timer starts here
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 5.25s
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 6.00s
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 6.75s // timer triggers to dismiss snackbar, reverse animation is scheduled
await tester.pump(); // begin animation
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 7.50s // last frame of animation, snackbar removed from build, new snack bar put in its place
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
});
testWidgets('SnackBar cancel test', (WidgetTester tester) async {
int snackBarCount = 0;
const Key tapTarget = Key('tap-target');
late int time;
late ScaffoldFeatureController<SnackBar, SnackBarClosedReason> lastController;
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
key: tapTarget,
onTap: () {
snackBarCount += 1;
lastController = ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text('bar$snackBarCount'),
duration: Duration(seconds: time),
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
);
},
),
),
));
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
time = 1000;
await tester.tap(find.byKey(tapTarget)); // queue bar1
final ScaffoldFeatureController<SnackBar, SnackBarClosedReason> firstController = lastController;
time = 2;
await tester.tap(find.byKey(tapTarget)); // queue bar2
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
await tester.pump(); // schedule animation for bar1
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(); // begin animation
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 0.75s // animation last frame; two second timer starts here
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 1.50s
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 2.25s
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 10000)); // 12.25s
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
firstController.close(); // snackbar is manually dismissed
await tester.pump(const Duration(milliseconds: 750)); // 13.00s // reverse animation is scheduled
await tester.pump(); // begin animation
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 13.75s // last frame of animation, snackbar removed from build, new snack bar put in its place
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(); // begin animation
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 14.50s // animation last frame; two second timer starts here
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 15.25s
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 16.00s
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 16.75s // timer triggers to dismiss snackbar, reverse animation is scheduled
await tester.pump(); // begin animation
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 17.50s // last frame of animation, snackbar removed from build, new snack bar put in its place
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
});
testWidgets('SnackBar dismiss test', (WidgetTester tester) async {
const Key tapTarget = Key('tap-target');
late DismissDirection dismissDirection;
late double width;
int snackBarCount = 0;
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
width = MediaQuery.of(context).size.width;
return GestureDetector(
key: tapTarget,
onTap: () {
snackBarCount += 1;
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text('bar$snackBarCount'),
duration: const Duration(seconds: 2),
dismissDirection: dismissDirection,
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
);
},
),
),
));
await _testSnackBarDismiss(
tester: tester,
tapTarget: tapTarget,
scaffoldWidth: width,
onDismissDirectionChange: (DismissDirection dir) => dismissDirection = dir,
onDragGestureChange: () => snackBarCount = 0,
);
});
testWidgets('SnackBar cannot be tapped twice', (WidgetTester tester) async {
int tapCount = 0;
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(
label: 'ACTION',
onPressed: () {
++tapCount;
},
),
));
},
child: const Text('X'),
);
},
),
),
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
expect(tapCount, equals(0));
await tester.tap(find.text('ACTION'));
expect(tapCount, equals(1));
await tester.tap(find.text('ACTION'));
expect(tapCount, equals(1));
await tester.pump();
await tester.tap(find.text('ACTION'));
expect(tapCount, equals(1));
});
testWidgets('Light theme SnackBar has dark background', (WidgetTester tester) async {
final ThemeData lightTheme = ThemeData.light();
await tester.pumpWidget(
MaterialApp(
theme: lightTheme,
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(
label: 'ACTION',
onPressed: () { },
),
),
);
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final RenderPhysicalModel renderModel = tester.renderObject(
find.widgetWithText(Material, 'I am a snack bar.').first,
);
// There is a somewhat complicated background color calculation based
// off of the surface color. For the default light theme it
// should be this value.
expect(renderModel.color, equals(const Color(0xFF333333)));
});
testWidgets('Dark theme SnackBar has light background', (WidgetTester tester) async {
final ThemeData darkTheme = ThemeData.dark();
await tester.pumpWidget(
MaterialApp(
theme: darkTheme,
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(
label: 'ACTION',
onPressed: () { },
),
),
);
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final RenderPhysicalModel renderModel = tester.renderObject(
find.widgetWithText(Material, 'I am a snack bar.').first,
);
expect(renderModel.color, equals(darkTheme.colorScheme.onSurface));
});
testWidgets('Dark theme SnackBar has primary text buttons', (WidgetTester tester) async {
final ThemeData darkTheme = ThemeData.dark();
await tester.pumpWidget(
MaterialApp(
theme: darkTheme,
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(
label: 'ACTION',
onPressed: () { },
),
),
);
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final TextStyle buttonTextStyle = tester.widget<RichText>(
find.descendant(of: find.text('ACTION'), matching: find.byType(RichText))
).text.style!;
expect(buttonTextStyle.color, equals(darkTheme.colorScheme.primary));
});
testWidgets('SnackBar should inherit theme data from its ancestor.', (WidgetTester tester) async {
final SliderThemeData sliderTheme = SliderThemeData.fromPrimaryColors(
primaryColor: Colors.black,
primaryColorDark: Colors.black,
primaryColorLight: Colors.black,
valueIndicatorTextStyle: const TextStyle(color: Colors.black),
);
final ChipThemeData chipTheme = ChipThemeData.fromDefaults(
primaryColor: Colors.black,
secondaryColor: Colors.white,
labelStyle: const TextStyle(color: Colors.black),
);
const PageTransitionsTheme pageTransitionTheme = PageTransitionsTheme(
builders: <TargetPlatform, PageTransitionsBuilder>{
TargetPlatform.iOS: CupertinoPageTransitionsBuilder(),
TargetPlatform.macOS: CupertinoPageTransitionsBuilder(),
},
);
final ThemeData theme = ThemeData.light().copyWith(
visualDensity: VisualDensity.standard,
primaryColor: Colors.black,
primaryColorBrightness: Brightness.dark,
primaryColorLight: Colors.black,
primaryColorDark: Colors.black,
canvasColor: Colors.black,
shadowColor: Colors.black,
scaffoldBackgroundColor: Colors.black,
bottomAppBarColor: Colors.black,
cardColor: Colors.black,
dividerColor: Colors.black,
focusColor: Colors.black,
hoverColor: Colors.black,
highlightColor: Colors.black,
splashColor: Colors.black,
splashFactory: InkRipple.splashFactory,
unselectedWidgetColor: Colors.black,
disabledColor: Colors.black,
buttonTheme: const ButtonThemeData(colorScheme: ColorScheme.dark()),
toggleButtonsTheme: const ToggleButtonsThemeData(textStyle: TextStyle(color: Colors.black)),
secondaryHeaderColor: Colors.black,
backgroundColor: Colors.black,
dialogBackgroundColor: Colors.black,
indicatorColor: Colors.black,
hintColor: Colors.black,
errorColor: Colors.black,
toggleableActiveColor: Colors.black,
textTheme: ThemeData.dark().textTheme,
primaryTextTheme: ThemeData.dark().textTheme,
inputDecorationTheme: ThemeData.dark().inputDecorationTheme.copyWith(border: const OutlineInputBorder()),
iconTheme: ThemeData.dark().iconTheme,
primaryIconTheme: ThemeData.dark().iconTheme,
sliderTheme: sliderTheme,
tabBarTheme: const TabBarTheme(labelColor: Colors.black),
tooltipTheme: const TooltipThemeData(height: 100),
cardTheme: const CardTheme(color: Colors.black),
chipTheme: chipTheme,
platform: TargetPlatform.iOS,
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
applyElevationOverlayColor: false,
pageTransitionsTheme: pageTransitionTheme,
appBarTheme: const AppBarTheme(backgroundColor: Colors.black),
scrollbarTheme: const ScrollbarThemeData(radius: Radius.circular(10.0)),
bottomAppBarTheme: const BottomAppBarTheme(color: Colors.black),
colorScheme: const ColorScheme.light(),
dialogTheme: const DialogTheme(backgroundColor: Colors.black),
floatingActionButtonTheme: const FloatingActionButtonThemeData(backgroundColor: Colors.black),
navigationRailTheme: const NavigationRailThemeData(backgroundColor: Colors.black),
typography: Typography.material2018(),
snackBarTheme: const SnackBarThemeData(backgroundColor: Colors.black),
bottomSheetTheme: const BottomSheetThemeData(backgroundColor: Colors.black),
popupMenuTheme: const PopupMenuThemeData(color: Colors.black),
bannerTheme: const MaterialBannerThemeData(backgroundColor: Colors.black),
dividerTheme: const DividerThemeData(color: Colors.black),
bottomNavigationBarTheme: const BottomNavigationBarThemeData(type: BottomNavigationBarType.fixed),
timePickerTheme: const TimePickerThemeData(backgroundColor: Colors.black),
textButtonTheme: TextButtonThemeData(style: TextButton.styleFrom(foregroundColor: Colors.red)),
elevatedButtonTheme: ElevatedButtonThemeData(style: ElevatedButton.styleFrom(backgroundColor: Colors.green)),
outlinedButtonTheme: OutlinedButtonThemeData(style: OutlinedButton.styleFrom(foregroundColor: Colors.blue)),
textSelectionTheme: const TextSelectionThemeData(cursorColor: Colors.black),
dataTableTheme: const DataTableThemeData(),
checkboxTheme: const CheckboxThemeData(),
radioTheme: const RadioThemeData(),
switchTheme: const SwitchThemeData(),
progressIndicatorTheme: const ProgressIndicatorThemeData(),
);
ThemeData? themeBeforeSnackBar;
ThemeData? themeAfterSnackBar;
await tester.pumpWidget(
MaterialApp(
theme: theme,
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
themeBeforeSnackBar = Theme.of(context);
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Builder(
builder: (BuildContext context) {
themeAfterSnackBar = Theme.of(context);
return const Text('I am a snack bar.');
},
),
duration: const Duration(seconds: 2),
action: SnackBarAction(
label: 'ACTION',
onPressed: () { },
),
),
);
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final ThemeData comparedTheme = themeBeforeSnackBar!.copyWith(
colorScheme: themeAfterSnackBar!.colorScheme,
); // Fields replaced by SnackBar.
expect(comparedTheme, themeAfterSnackBar);
});
testWidgets('Snackbar margin can be customized', (WidgetTester tester) async {
const double padding = 20.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('I am a snack bar.'),
margin: EdgeInsets.all(padding),
behavior: SnackBarBehavior.floating,
),
);
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final Finder materialFinder = find.descendant(
of: find.byType(SnackBar),
matching: find.byType(Material),
);
final Offset snackBarBottomLeft = tester.getBottomLeft(materialFinder);
final Offset snackBarBottomRight = tester.getBottomRight(materialFinder);
expect(snackBarBottomLeft.dx, padding);
expect(snackBarBottomLeft.dy, 600 - padding); // Device height is 600.
expect(snackBarBottomRight.dx, 800 - padding); // Device width is 800.
});
testWidgets('SnackbarBehavior.floating is positioned within safe area', (WidgetTester tester) async {
const double viewPadding = 50.0;
const double floatingSnackBarDefaultBottomMargin = 10.0;
await tester.pumpWidget(
MaterialApp(
home: MediaQuery(
data: const MediaQueryData(
// Simulate non-safe area.
viewPadding: EdgeInsets.only(bottom: viewPadding),
),
child: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('I am a snack bar.'),
behavior: SnackBarBehavior.floating,
),
);
},
child: const Text('X'),
);
},
),
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // Start animation
await tester.pump(const Duration(milliseconds: 750));
final Finder materialFinder = find.descendant(
of: find.byType(SnackBar),
matching: find.byType(Material),
);
final Offset snackBarBottomLeft = tester.getBottomLeft(materialFinder);
expect(
snackBarBottomLeft.dy,
// Device height is 600.
600 - viewPadding - floatingSnackBarDefaultBottomMargin,
);
});
testWidgets('Snackbar padding can be customized', (WidgetTester tester) async {
const double padding = 20.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('I am a snack bar.'),
padding: EdgeInsets.all(padding),
),
);
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final Finder textFinder = find.text('I am a snack bar.');
final Finder materialFinder = find.descendant(
of: find.byType(SnackBar),
matching: find.byType(Material),
);
final Offset textBottomLeft = tester.getBottomLeft(textFinder);
final Offset textTopRight = tester.getTopRight(textFinder);
final Offset snackBarBottomLeft = tester.getBottomLeft(materialFinder);
final Offset snackBarTopRight = tester.getTopRight(materialFinder);
expect(textBottomLeft.dx - snackBarBottomLeft.dx, padding);
expect(snackBarTopRight.dx - textTopRight.dx, padding);
expect(snackBarBottomLeft.dy - textBottomLeft.dy, padding);
expect(textTopRight.dy - snackBarTopRight.dy, padding);
});
testWidgets('Snackbar width can be customized', (WidgetTester tester) async {
const double width = 200.0;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('I am a snack bar.'),
width: width,
behavior: SnackBarBehavior.floating,
),
);
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final Finder materialFinder = find.descendant(
of: find.byType(SnackBar),
matching: find.byType(Material),
);
final Offset snackBarBottomLeft = tester.getBottomLeft(materialFinder);
final Offset snackBarBottomRight = tester.getBottomRight(materialFinder);
expect(snackBarBottomLeft.dx, (800 - width) / 2); // Device width is 800.
expect(snackBarBottomRight.dx, (800 + width) / 2); // Device width is 800.
});
testWidgets('Snackbar labels can be colored', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(
textColor: Colors.lightBlue,
disabledTextColor: Colors.red,
label: 'ACTION',
onPressed: () { },
),
),
);
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final Element actionTextBox = tester.element(find.text('ACTION'));
final Widget textWidget = actionTextBox.widget;
final DefaultTextStyle defaultTextStyle = DefaultTextStyle.of(actionTextBox);
if (textWidget is Text) {
final TextStyle effectiveStyle = defaultTextStyle.style.merge(textWidget.style);
expect(effectiveStyle.color, Colors.lightBlue);
} else {
expect(false, true);
}
});
testWidgets('SnackBar button text alignment', (WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
home: MediaQuery(
data: const MediaQueryData(
padding: EdgeInsets.only(
left: 10.0,
top: 20.0,
right: 30.0,
bottom: 40.0,
),
),
child: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () { }),
));
},
child: const Text('X'),
);
},
),
),
),
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750)); // Animation last frame.
final Offset textBottomLeft = tester.getBottomLeft(find.text('I am a snack bar.'));
final Offset textBottomRight = tester.getBottomRight(find.text('I am a snack bar.'));
final Offset actionTextBottomLeft = tester.getBottomLeft(find.text('ACTION'));
final Offset actionTextBottomRight = tester.getBottomRight(find.text('ACTION'));
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
expect(textBottomLeft.dx - snackBarBottomLeft.dx, 24.0 + 10.0); // margin + left padding
expect(snackBarBottomLeft.dy - textBottomLeft.dy, 17.0 + 40.0); // margin + bottom padding
expect(actionTextBottomLeft.dx - textBottomRight.dx, 24.0 + 12.0); // action padding + margin
expect(snackBarBottomRight.dx - actionTextBottomRight.dx, 24.0 + 12.0 + 30.0); // action (padding + margin) + right padding
expect(snackBarBottomRight.dy - actionTextBottomRight.dy, 17.0 + 40.0); // margin + bottom padding
});
testWidgets(
'Custom padding between SnackBar and its contents when set to SnackBarBehavior.fixed',
(WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
home: MediaQuery(
data: const MediaQueryData(
padding: EdgeInsets.only(
left: 10.0,
top: 20.0,
right: 30.0,
bottom: 40.0,
),
),
child: Scaffold(
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(icon: Icon(Icons.favorite), label: 'Animutation'),
BottomNavigationBarItem(icon: Icon(Icons.block), label: 'Zombo.com'),
],
),
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
));
},
child: const Text('X'),
);
},
),
),
),
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750)); // Animation last frame.
final Offset textBottomLeft = tester.getBottomLeft(find.text('I am a snack bar.'));
final Offset textBottomRight = tester.getBottomRight(find.text('I am a snack bar.'));
final Offset actionTextBottomLeft = tester.getBottomLeft(find.text('ACTION'));
final Offset actionTextBottomRight = tester.getBottomRight(find.text('ACTION'));
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
expect(textBottomLeft.dx - snackBarBottomLeft.dx, 24.0 + 10.0); // margin + left padding
expect(snackBarBottomLeft.dy - textBottomLeft.dy, 17.0); // margin (with no bottom padding)
expect(actionTextBottomLeft.dx - textBottomRight.dx, 24.0 + 12.0); // action padding + margin
expect(snackBarBottomRight.dx - actionTextBottomRight.dx, 24.0 + 12.0 + 30.0); // action (padding + margin) + right padding
expect(snackBarBottomRight.dy - actionTextBottomRight.dy, 17.0); // margin (with no bottom padding)
},
);
testWidgets('SnackBar should push FloatingActionButton above', (WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
home: MediaQuery(
data: const MediaQueryData(
padding: EdgeInsets.only(
left: 10.0,
top: 20.0,
right: 30.0,
bottom: 40.0,
),
),
child: Scaffold(
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.send),
onPressed: () {},
),
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
));
},
child: const Text('X'),
);
},
),
),
),
));
// Get the Rect of the FAB to compare after the SnackBar appears.
final Rect originalFabRect = tester.getRect(find.byType(FloatingActionButton));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750)); // Animation last frame.
final Rect fabRect = tester.getRect(find.byType(FloatingActionButton));
// FAB should shift upwards after SnackBar appears.
expect(fabRect.center.dy, lessThan(originalFabRect.center.dy));
final Offset snackBarTopRight = tester.getTopRight(find.byType(SnackBar));
// FAB's surrounding padding is set to [kFloatingActionButtonMargin] in floating_action_button_location.dart by default.
const int defaultFabPadding = 16;
// FAB should be positioned above the SnackBar by the default padding.
expect(fabRect.bottomRight.dy, snackBarTopRight.dy - defaultFabPadding);
});
testWidgets('Floating SnackBar button text alignment', (WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
theme: ThemeData(
snackBarTheme: const SnackBarThemeData(behavior: SnackBarBehavior.floating),
),
home: MediaQuery(
data: const MediaQueryData(
padding: EdgeInsets.only(
left: 10.0,
top: 20.0,
right: 30.0,
bottom: 40.0,
),
),
child: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
));
},
child: const Text('X'),
);
},
),
),
),
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750)); // Animation last frame.
final Offset textBottomLeft = tester.getBottomLeft(find.text('I am a snack bar.'));
final Offset textBottomRight = tester.getBottomRight(find.text('I am a snack bar.'));
final Offset actionTextBottomLeft = tester.getBottomLeft(find.text('ACTION'));
final Offset actionTextBottomRight = tester.getBottomRight(find.text('ACTION'));
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
expect(textBottomLeft.dx - snackBarBottomLeft.dx, 31.0 + 10.0); // margin + left padding
expect(snackBarBottomLeft.dy - textBottomLeft.dy, 27.0); // margin (with no bottom padding)
expect(actionTextBottomLeft.dx - textBottomRight.dx, 16.0 + 8.0); // action padding + margin
expect(snackBarBottomRight.dx - actionTextBottomRight.dx, 31.0 + 30.0 + 8.0); // margin + right (padding + margin)
expect(snackBarBottomRight.dy - actionTextBottomRight.dy, 27.0); // margin (with no bottom padding)
});
testWidgets(
'Custom padding between SnackBar and its contents when set to SnackBarBehavior.floating',
(WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
theme: ThemeData(
snackBarTheme: const SnackBarThemeData(behavior: SnackBarBehavior.floating),
),
home: MediaQuery(
data: const MediaQueryData(
padding: EdgeInsets.only(
left: 10.0,
top: 20.0,
right: 30.0,
bottom: 40.0,
),
),
child: Scaffold(
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(icon: Icon(Icons.favorite), label: 'Animutation'),
BottomNavigationBarItem(icon: Icon(Icons.block), label: 'Zombo.com'),
],
),
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
));
},
child: const Text('X'),
);
},
),
),
),
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750)); // Animation last frame.
final Offset textBottomLeft = tester.getBottomLeft(find.text('I am a snack bar.'));
final Offset textBottomRight = tester.getBottomRight(find.text('I am a snack bar.'));
final Offset actionTextBottomLeft = tester.getBottomLeft(find.text('ACTION'));
final Offset actionTextBottomRight = tester.getBottomRight(find.text('ACTION'));
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
expect(textBottomLeft.dx - snackBarBottomLeft.dx, 31.0 + 10.0); // margin + left padding
expect(snackBarBottomLeft.dy - textBottomLeft.dy, 27.0); // margin (with no bottom padding)
expect(actionTextBottomLeft.dx - textBottomRight.dx, 16.0 + 8.0); // action (margin + padding)
expect(snackBarBottomRight.dx - actionTextBottomRight.dx, 31.0 + 30.0 + 8.0); // margin + right (padding + margin)
expect(snackBarBottomRight.dy - actionTextBottomRight.dy, 27.0); // margin (with no bottom padding)
},
);
testWidgets('SnackBarClosedReason', (WidgetTester tester) async {
final GlobalKey<ScaffoldMessengerState> scaffoldMessengerKey = GlobalKey<ScaffoldMessengerState>();
bool actionPressed = false;
SnackBarClosedReason? closedReason;
await tester.pumpWidget(MaterialApp(
scaffoldMessengerKey: scaffoldMessengerKey,
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('snack'),
duration: const Duration(seconds: 2),
action: SnackBarAction(
label: 'ACTION',
onPressed: () {
actionPressed = true;
},
),
)).closed.then<void>((SnackBarClosedReason reason) {
closedReason = reason;
});
},
child: const Text('X'),
);
},
),
),
));
// Pop up the snack bar and then press its action button.
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
expect(actionPressed, isFalse);
await tester.tap(find.text('ACTION'));
expect(actionPressed, isTrue);
// Closed reason is only set when the animation is complete.
await tester.pump(const Duration(milliseconds: 250));
expect(closedReason, isNull);
// Wait for animation to complete.
await tester.pumpAndSettle(const Duration(seconds: 1));
expect(closedReason, equals(SnackBarClosedReason.action));
// Pop up the snack bar and then swipe downwards to dismiss it.
await tester.tap(find.text('X'));
await tester.pump(const Duration(milliseconds: 750));
await tester.pump(const Duration(milliseconds: 750));
await tester.drag(find.text('snack'), const Offset(0.0, 50.0));
await tester.pumpAndSettle(const Duration(seconds: 1));
expect(closedReason, equals(SnackBarClosedReason.swipe));
// Pop up the snack bar and then remove it.
await tester.tap(find.text('X'));
await tester.pump(const Duration(milliseconds: 750));
scaffoldMessengerKey.currentState!.removeCurrentSnackBar();
await tester.pumpAndSettle(const Duration(seconds: 1));
expect(closedReason, equals(SnackBarClosedReason.remove));
// Pop up the snack bar and then hide it.
await tester.tap(find.text('X'));
await tester.pump(const Duration(milliseconds: 750));
scaffoldMessengerKey.currentState!.hideCurrentSnackBar();
await tester.pumpAndSettle(const Duration(seconds: 1));
expect(closedReason, equals(SnackBarClosedReason.hide));
// Pop up the snack bar and then let it time out.
await tester.tap(find.text('X'));
await tester.pump(const Duration(milliseconds: 750));
await tester.pump(const Duration(milliseconds: 750));
await tester.pump(const Duration(milliseconds: 1500));
await tester.pump(); // begin animation
await tester.pumpAndSettle(const Duration(seconds: 1));
expect(closedReason, equals(SnackBarClosedReason.timeout));
});
testWidgets('accessible navigation behavior with action', (WidgetTester tester) async {
final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
await tester.pumpWidget(MaterialApp(
home: MediaQuery(
data: const MediaQueryData(accessibleNavigation: true),
child: ScaffoldMessenger(
child: Builder(
builder: (BuildContext context) {
return Scaffold(
key: scaffoldKey,
body: GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('snack'),
duration: const Duration(seconds: 1),
action: SnackBarAction(
label: 'ACTION',
onPressed: () { },
),
));
},
child: const Text('X'),
),
);
},
),
),
),
));
await tester.tap(find.text('X'));
await tester.pump();
// Find action immediately
expect(find.text('ACTION'), findsOneWidget);
// Snackbar doesn't close
await tester.pump(const Duration(seconds: 10));
expect(find.text('ACTION'), findsOneWidget);
await tester.tap(find.text('ACTION'));
await tester.pump();
// Snackbar closes immediately
expect(find.text('ACTION'), findsNothing);
});
testWidgets('contributes dismiss semantics', (WidgetTester tester) async {
final SemanticsHandle handle = tester.ensureSemantics();
final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
await tester.pumpWidget(MaterialApp(
home: MediaQuery(
data: const MediaQueryData(accessibleNavigation: true),
child: ScaffoldMessenger(
child: Builder(builder: (BuildContext context) {
return Scaffold(
key: scaffoldKey,
body: GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('snack'),
duration: const Duration(seconds: 1),
action: SnackBarAction(
label: 'ACTION',
onPressed: () { },
),
));
},
child: const Text('X'),
),
);
}),
),
),
));
await tester.tap(find.text('X'));
await tester.pumpAndSettle();
expect(tester.getSemantics(find.text('snack')), matchesSemantics(
isLiveRegion: true,
hasDismissAction: true,
hasScrollDownAction: true,
hasScrollUpAction: true,
label: 'snack',
textDirection: TextDirection.ltr,
));
handle.dispose();
});
testWidgets('SnackBar default display duration test', (WidgetTester tester) async {
const String helloSnackBar = 'Hello SnackBar';
const Key tapTarget = Key('tap-target');
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
key: tapTarget,
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
content: Text(helloSnackBar),
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
);
},
),
),
));
expect(find.text(helloSnackBar), findsNothing);
await tester.tap(find.byKey(tapTarget));
expect(find.text(helloSnackBar), findsNothing);
await tester.pump(); // schedule animation
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(); // begin animation
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 0.75s // animation last frame; four second timer starts here
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 1.50s
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 2.25s
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 3.00s
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 3.75s
expect(find.text(helloSnackBar), findsOneWidget);
await tester.pump(const Duration(milliseconds: 1000)); // 4.75s // timer triggers to dismiss snackbar, reverse animation is scheduled
await tester.pump(); // begin animation
expect(find.text(helloSnackBar), findsOneWidget); // frame 0 of dismiss animation
await tester.pump(const Duration(milliseconds: 750)); // 5.50s // last frame of animation, snackbar removed from build
expect(find.text(helloSnackBar), findsNothing);
});
testWidgets('SnackBar handles updates to accessibleNavigation', (WidgetTester tester) async {
Future<void> boilerplate({ required bool accessibleNavigation }) {
return tester.pumpWidget(MaterialApp(
home: MediaQuery(
data: MediaQueryData(accessibleNavigation: accessibleNavigation),
child: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('test'),
action: SnackBarAction(label: 'foo', onPressed: () { }),
));
},
behavior: HitTestBehavior.opaque,
child: const Text('X'),
);
},
),
),
),
));
}
await boilerplate(accessibleNavigation: false);
expect(find.text('test'), findsNothing);
await tester.tap(find.text('X'));
await tester.pump(); // schedule animation
expect(find.text('test'), findsOneWidget);
await tester.pump(); // begin animation
await tester.pump(const Duration(milliseconds: 4750)); // 4.75s
expect(find.text('test'), findsOneWidget);
// Enabled accessible navigation
await boilerplate(accessibleNavigation: true);
await tester.pump(const Duration(milliseconds: 4000)); // 8.75s
await tester.pump();
expect(find.text('test'), findsOneWidget);
// disable accessible navigation
await boilerplate(accessibleNavigation: false);
await tester.pumpAndSettle(const Duration(milliseconds: 5750));
expect(find.text('test'), findsNothing);
});
testWidgets('Snackbar calls onVisible once', (WidgetTester tester) async {
const Key tapTarget = Key('tap-target');
int called = 0;
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
key: tapTarget,
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('hello'),
duration: const Duration(seconds: 1),
onVisible: () {
called += 1;
},
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
);
},
),
),
));
await tester.tap(find.byKey(tapTarget));
await tester.pump(); // start animation
await tester.pumpAndSettle();
expect(find.text('hello'), findsOneWidget);
expect(called, 1);
});
testWidgets('Snackbar does not call onVisible when it is queued', (WidgetTester tester) async {
const Key tapTarget = Key('tap-target');
int called = 0;
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
key: tapTarget,
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('hello'),
duration: const Duration(seconds: 1),
onVisible: () {
called += 1;
},
));
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('hello 2'),
duration: const Duration(seconds: 1),
onVisible: () {
called += 1;
},
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
);
},
),
),
));
await tester.tap(find.byKey(tapTarget));
await tester.pump(); // start animation
await tester.pumpAndSettle();
expect(find.text('hello'), findsOneWidget);
expect(called, 1);
});
group('SnackBar position', () {
for (final SnackBarBehavior behavior in SnackBarBehavior.values) {
final SnackBar snackBar = SnackBar(
content: const Text('SnackBar text'),
behavior: behavior,
);
testWidgets(
'$behavior should align SnackBar with the bottom of Scaffold '
'when Scaffold has no other elements',
(WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Container(),
),
),
);
final ScaffoldMessengerState scaffoldMessengerState = tester.state(find.byType(ScaffoldMessenger));
scaffoldMessengerState.showSnackBar(snackBar);
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
final Offset scaffoldBottomRight = tester.getBottomRight(find.byType(Scaffold));
expect(snackBarBottomRight, equals(scaffoldBottomRight));
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset scaffoldBottomLeft = tester.getBottomLeft(find.byType(Scaffold));
expect(snackBarBottomLeft, equals(scaffoldBottomLeft));
},
);
testWidgets(
'$behavior should align SnackBar with the top of BottomNavigationBar '
'when Scaffold has no FloatingActionButton',
(WidgetTester tester) async {
final UniqueKey boxKey = UniqueKey();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Container(),
bottomNavigationBar: SizedBox(key: boxKey, width: 800, height: 60),
),
),
);
final ScaffoldMessengerState scaffoldMessengerState = tester.state(find.byType(ScaffoldMessenger));
scaffoldMessengerState.showSnackBar(snackBar);
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
final Offset bottomNavigationBarTopRight = tester.getTopRight(find.byKey(boxKey));
expect(snackBarBottomRight, equals(bottomNavigationBarTopRight));
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset bottomNavigationBarTopLeft = tester.getTopLeft(find.byKey(boxKey));
expect(snackBarBottomLeft, equals(bottomNavigationBarTopLeft));
},
);
testWidgets(
'Padding of $behavior is not consumed by viewInsets',
(WidgetTester tester) async {
final Widget child = MaterialApp(
home: Scaffold(
resizeToAvoidBottomInset: false,
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.send),
onPressed: () {},
),
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
behavior: behavior,
),
);
},
child: const Text('X'),
);
},
),
),
);
await tester.pumpWidget(
MediaQuery(
data: const MediaQueryData(
padding: EdgeInsets.only(bottom: 20.0),
),
child: child,
),
);
await tester.tap(find.text('X'));
await tester.pumpAndSettle(); // Show snackbar
final Offset initialBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset initialBottomRight = tester.getBottomRight(find.byType(SnackBar));
// Consume bottom padding - as if by the keyboard opening
await tester.pumpWidget(
MediaQuery(
data: const MediaQueryData(
viewPadding: EdgeInsets.all(20),
viewInsets: EdgeInsets.all(100),
),
child: child,
),
);
await tester.tap(find.text('X'));
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
final Offset finalBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset finalBottomRight = tester.getBottomRight(find.byType(SnackBar));
expect(initialBottomLeft, finalBottomLeft);
expect(initialBottomRight, finalBottomRight);
},
);
}
testWidgets(
'${SnackBarBehavior.fixed} should align SnackBar with the bottom of Scaffold '
'when Scaffold has a FloatingActionButton',
(WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Container(),
floatingActionButton: FloatingActionButton(onPressed: () {}),
),
),
);
final ScaffoldMessengerState scaffoldMessengerState = tester.state(find.byType(ScaffoldMessenger));
scaffoldMessengerState.showSnackBar(
const SnackBar(
content: Text('Snackbar text'),
behavior: SnackBarBehavior.fixed,
),
);
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
final Offset scaffoldBottomRight = tester.getBottomRight(find.byType(Scaffold));
expect(snackBarBottomRight, equals(scaffoldBottomRight));
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset scaffoldBottomLeft = tester.getBottomLeft(find.byType(Scaffold));
expect(snackBarBottomLeft, equals(scaffoldBottomLeft));
},
);
testWidgets(
'${SnackBarBehavior.floating} should align SnackBar with the top of FloatingActionButton when Scaffold has a FloatingActionButton',
(WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
home: Scaffold(
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.send),
onPressed: () {},
),
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
behavior: SnackBarBehavior.floating,
));
},
child: const Text('X'),
);
},
),
),
));
await tester.tap(find.text('X'));
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset floatingActionButtonTopLeft = tester.getTopLeft(
find.byType(FloatingActionButton),
);
// Since padding between the SnackBar and the FAB is created by the SnackBar,
// the bottom offset of the SnackBar should be equal to the top offset of the FAB
expect(snackBarBottomLeft.dy, floatingActionButtonTopLeft.dy);
},
);
testWidgets(
'${SnackBarBehavior.fixed} should align SnackBar with the top of BottomNavigationBar '
'when Scaffold has a BottomNavigationBar and FloatingActionButton',
(WidgetTester tester) async {
final UniqueKey boxKey = UniqueKey();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Container(),
bottomNavigationBar: SizedBox(key: boxKey, width: 800, height: 60),
floatingActionButton: FloatingActionButton(onPressed: () {}),
),
),
);
final ScaffoldMessengerState scaffoldMessengerState = tester.state(find.byType(ScaffoldMessenger));
scaffoldMessengerState.showSnackBar(
const SnackBar(
content: Text('SnackBar text'),
behavior: SnackBarBehavior.fixed,
),
);
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
final Offset bottomNavigationBarTopRight = tester.getTopRight(find.byKey(boxKey));
expect(snackBarBottomRight, equals(bottomNavigationBarTopRight));
final Offset snackBarBottomLeft = tester.getBottomLeft(find.byType(SnackBar));
final Offset bottomNavigationBarTopLeft = tester.getTopLeft(find.byKey(boxKey));
expect(snackBarBottomLeft, equals(bottomNavigationBarTopLeft));
},
);
testWidgets(
'${SnackBarBehavior.floating} should align SnackBar with the top of FloatingActionButton '
'when Scaffold has BottomNavigationBar and FloatingActionButton',
(WidgetTester tester) async {
final UniqueKey boxKey = UniqueKey();
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Container(),
bottomNavigationBar: SizedBox(key: boxKey, width: 800, height: 60),
floatingActionButton: FloatingActionButton(onPressed: () {}),
),
),
);
final ScaffoldMessengerState scaffoldMessengerState = tester.state(find.byType(ScaffoldMessenger));
scaffoldMessengerState.showSnackBar(
const SnackBar(
content: Text('SnackBar text'),
behavior: SnackBarBehavior.floating,
),
);
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
final Offset snackBarBottomRight = tester.getBottomRight(find.byType(SnackBar));
final Offset fabTopRight = tester.getTopRight(find.byType(FloatingActionButton));
expect(snackBarBottomRight.dy, equals(fabTopRight.dy));
},
);
Future<void> openFloatingSnackBar(WidgetTester tester) async {
final ScaffoldMessengerState scaffoldMessengerState = tester.state(find.byType(ScaffoldMessenger));
scaffoldMessengerState.showSnackBar(
const SnackBar(
content: Text('SnackBar text'),
behavior: SnackBarBehavior.floating,
),
);
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
}
void expectSnackBarNotVisibleError(WidgetTester tester) {
final AssertionError exception = tester.takeException() as AssertionError;
const String message = 'Floating SnackBar presented off screen.\n'
'A SnackBar with behavior property set to SnackBarBehavior.floating is fully '
'or partially off screen because some or all the widgets provided to '
'Scaffold.floatingActionButton, Scaffold.persistentFooterButtons and '
'Scaffold.bottomNavigationBar take up too much vertical space.\n'
'Consider constraining the size of these widgets to allow room for the SnackBar to be visible.';
expect(exception.message, message);
}
testWidgets('Snackbar with SnackBarBehavior.floating will assert when offsetted too high by a large Scaffold.floatingActionButton', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/84263
Future<void> boilerplate({required double? fabHeight}) {
return tester.pumpWidget(
MaterialApp(
home: Scaffold(
floatingActionButton: Container(height: fabHeight),
),
),
);
}
// Run once with a visible SnackBar to compute the empty space above SnackBar.
const double mediumFabHeight = 100;
await boilerplate(fabHeight: mediumFabHeight);
await openFloatingSnackBar(tester);
expect(tester.takeException(), isNull);
final double spaceAboveSnackBar = tester.getTopLeft(find.byType(SnackBar)).dy;
// Run with the Snackbar fully off screen.
await boilerplate(fabHeight: spaceAboveSnackBar + mediumFabHeight * 2);
await openFloatingSnackBar(tester);
expectSnackBarNotVisibleError(tester);
// Run with the Snackbar partially off screen.
await boilerplate(fabHeight: spaceAboveSnackBar + mediumFabHeight + 10);
await openFloatingSnackBar(tester);
expectSnackBarNotVisibleError(tester);
// Run with the Snackbar fully visible right on the top of the screen.
await boilerplate(fabHeight: spaceAboveSnackBar + mediumFabHeight);
await openFloatingSnackBar(tester);
expect(tester.takeException(), isNull);
});
testWidgets('Snackbar with SnackBarBehavior.floating will assert when offsetted too high by a large Scaffold.persistentFooterButtons', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/84263
await tester.pumpWidget(
const MaterialApp(
home: Scaffold(
persistentFooterButtons: <Widget>[SizedBox(height: 1000)],
),
),
);
await openFloatingSnackBar(tester);
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
expectSnackBarNotVisibleError(tester);
});
testWidgets('Snackbar with SnackBarBehavior.floating will assert when offsetted too high by a large Scaffold.bottomNavigationBar', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/84263
await tester.pumpWidget(
const MaterialApp(
home: Scaffold(
bottomNavigationBar: SizedBox(height: 1000),
),
),
);
await openFloatingSnackBar(tester);
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
expectSnackBarNotVisibleError(tester);
});
testWidgets(
'SnackBar has correct end padding when it contains an action with fixed behavior',
(WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('Some content'),
behavior: SnackBarBehavior.fixed,
action: SnackBarAction(
label: 'ACTION',
onPressed: () {},
),
));
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pumpAndSettle();
final Offset snackBarTopRight = tester.getTopRight(find.byType(SnackBar));
final Offset actionTopRight = tester.getTopRight(find.byType(SnackBarAction));
expect(snackBarTopRight.dx - actionTopRight.dx, 12.0);
},
);
testWidgets(
'SnackBar has correct end padding when it contains an action with floating behavior',
(WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: const Text('Some content'),
behavior: SnackBarBehavior.floating,
action: SnackBarAction(
label: 'ACTION',
onPressed: () {},
),
));
},
child: const Text('X'),
);
},
),
),
),
);
await tester.tap(find.text('X'));
await tester.pumpAndSettle();
final Offset snackBarTopRight = tester.getTopRight(find.byType(SnackBar));
final Offset actionTopRight = tester.getTopRight(find.byType(SnackBarAction));
expect(snackBarTopRight.dx - actionTopRight.dx, 8.0 + 15.0); // button margin + horizontal scaffold outside margin
},
);
});
testWidgets('SnackBars hero across transitions when using ScaffoldMessenger', (WidgetTester tester) async {
const String snackBarText = 'hello snackbar';
const String firstHeader = 'home';
const String secondHeader = 'second';
const Key snackTarget = Key('snack-target');
const Key transitionTarget = Key('transition-target');
Widget buildApp() {
return MaterialApp(
routes: <String, WidgetBuilder> {
'/': (BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text(firstHeader)),
body: Center(
child: ElevatedButton(
key: transitionTarget,
child: const Text('PUSH'),
onPressed: () {
Navigator.of(context).pushNamed('/second');
},
),
),
floatingActionButton: FloatingActionButton(
key: snackTarget,
onPressed: () async {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text(snackBarText),
),
);
},
child: const Text('X'),
),
);
},
'/second': (BuildContext context) => Scaffold(appBar: AppBar(title: const Text(secondHeader))),
},
);
}
await tester.pumpWidget(buildApp());
expect(find.text(snackBarText), findsNothing);
expect(find.text(firstHeader), findsOneWidget);
expect(find.text(secondHeader), findsNothing);
// Present SnackBar
await tester.tap(find.byKey(snackTarget));
await tester.pump(); // schedule animation
expect(find.text(snackBarText), findsOneWidget);
await tester.pump(); // begin animation
expect(find.text(snackBarText), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750));
expect(find.text(snackBarText), findsOneWidget);
// Push new route
await tester.tap(find.byKey(transitionTarget));
await tester.pump();
expect(find.text(snackBarText), findsOneWidget);
expect(find.text(firstHeader), findsOneWidget);
expect(find.text(secondHeader, skipOffstage: false), findsOneWidget);
await tester.pump();
expect(find.text(snackBarText), findsOneWidget);
expect(find.text(firstHeader), findsOneWidget);
expect(find.text(secondHeader), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750));
expect(find.text(snackBarText), findsOneWidget);
expect(find.text(firstHeader), findsNothing);
expect(find.text(secondHeader), findsOneWidget);
});
testWidgets('Should have only one SnackBar during back swipe navigation', (WidgetTester tester) async {
const String snackBarText = 'hello snackbar';
const Key snackTarget = Key('snack-target');
const Key transitionTarget = Key('transition-target');
Widget buildApp() {
final PageTransitionsTheme pageTransitionTheme = PageTransitionsTheme(
builders: <TargetPlatform, PageTransitionsBuilder>{
for(final TargetPlatform platform in TargetPlatform.values)
platform: const CupertinoPageTransitionsBuilder(),
},
);
return MaterialApp(
theme: ThemeData(pageTransitionsTheme: pageTransitionTheme),
initialRoute: '/',
routes: <String, WidgetBuilder> {
'/': (BuildContext context) {
return Scaffold(
body: Center(
child: ElevatedButton(
key: transitionTarget,
child: const Text('PUSH'),
onPressed: () {
Navigator.of(context).pushNamed('/second');
},
),
),
);
},
'/second': (BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
key: snackTarget,
onPressed: () async {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text(snackBarText),
),
);
},
child: const Text('X'),
),
);
},
},
);
}
await tester.pumpWidget(buildApp());
// Transition to second page.
await tester.tap(find.byKey(transitionTarget));
await tester.pumpAndSettle();
// Present SnackBar
await tester.tap(find.byKey(snackTarget));
await tester.pump(); // schedule animation
expect(find.text(snackBarText), findsOneWidget);
await tester.pump(); // begin animation
expect(find.text(snackBarText), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750));
expect(find.text(snackBarText), findsOneWidget);
// Start the gesture at the edge of the screen.
final TestGesture gesture = await tester.startGesture(const Offset(5.0, 200.0));
// Trigger the swipe.
await gesture.moveBy(const Offset(100.0, 0.0));
// Back gestures should trigger and draw the hero transition in the very same
// frame (since the "from" route has already moved to reveal the "to" route).
await tester.pump();
// We should have only one SnackBar displayed on the screen.
expect(find.text(snackBarText), findsOneWidget);
});
testWidgets('SnackBars should be shown above the bottomSheet', (WidgetTester tester) async {
await tester.pumpWidget(const MaterialApp(
home: Scaffold(
bottomSheet: SizedBox(
width: 200,
height: 50,
child: ColoredBox(
color: Colors.pink,
),
),
),
));
final ScaffoldMessengerState scaffoldMessengerState = tester.state(find.byType(ScaffoldMessenger));
scaffoldMessengerState.showSnackBar(SnackBar(
content: const Text('I love Flutter!'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
behavior: SnackBarBehavior.floating,
));
await tester.pumpAndSettle(); // Have the SnackBar fully animate out.
await expectLater(find.byType(MaterialApp), matchesGoldenFile('snack_bar.goldenTest.workWithBottomSheet.png'));
});
testWidgets('ScaffoldMessenger does not duplicate a SnackBar when presenting a MaterialBanner.', (WidgetTester tester) async {
const Key materialBannerTapTarget = Key('materialbanner-tap-target');
const Key snackBarTapTarget = Key('snackbar-tap-target');
const String snackBarText = 'SnackBar';
const String materialBannerText = 'MaterialBanner';
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: Builder(
builder: (BuildContext context) {
return Column(
children: <Widget>[
GestureDetector(
key: snackBarTapTarget,
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
content: Text(snackBarText),
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
),
GestureDetector(
key: materialBannerTapTarget,
onTap: () {
ScaffoldMessenger.of(context).showMaterialBanner(MaterialBanner(
content: const Text(materialBannerText),
actions: <Widget>[
TextButton(
child: const Text('DISMISS'),
onPressed: () => ScaffoldMessenger.of(context).hideCurrentMaterialBanner(),
),
],
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
),
],
);
},
),
),
));
await tester.tap(find.byKey(snackBarTapTarget));
await tester.tap(find.byKey(materialBannerTapTarget));
await tester.pumpAndSettle();
expect(find.text(snackBarText), findsOneWidget);
expect(find.text(materialBannerText), findsOneWidget);
});
testWidgets('ScaffoldMessenger presents SnackBars to only the root Scaffold when Scaffolds are nested.', (WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: const Scaffold(),
floatingActionButton: FloatingActionButton(onPressed: () {}),
),
));
final ScaffoldMessengerState scaffoldMessengerState = tester.state<ScaffoldMessengerState>(
find.byType(ScaffoldMessenger),
);
scaffoldMessengerState.showSnackBar(SnackBar(
content: const Text('ScaffoldMessenger'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
behavior: SnackBarBehavior.floating,
));
await tester.pumpAndSettle();
expect(find.byType(SnackBar), findsOneWidget);
// The FloatingActionButton helps us identify which Scaffold has the
// SnackBar here. Since the outer Scaffold contains a FAB, the SnackBar
// should be above it. If the inner Scaffold had the SnackBar, it would be
// overlapping the FAB.
await expectLater(
find.byType(MaterialApp),
matchesGoldenFile('snack_bar.scaffold.nested.png'),
);
final Offset snackBarTopRight = tester.getTopRight(find.byType(SnackBar));
expect(snackBarTopRight.dy, 465.0);
});
testWidgets('ScaffoldMessengerState clearSnackBars works as expected', (WidgetTester tester) async {
final List<String> snackBars = <String>['Hello Snackbar', 'Hi Snackbar', 'Bye Snackbar'];
int snackBarCounter = 0;
const Key tapTarget = Key('tap-target');
final GlobalKey<ScaffoldMessengerState> scaffoldMessengerKey = GlobalKey();
await tester.pumpWidget(MaterialApp(
home: ScaffoldMessenger(
key: scaffoldMessengerKey,
child: Scaffold(
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
key: tapTarget,
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text(snackBars[snackBarCounter++]),
duration: const Duration(seconds: 2),
));
},
behavior: HitTestBehavior.opaque,
child: const SizedBox(
height: 100.0,
width: 100.0,
),
);
},
),
),
),
));
expect(find.text(snackBars[0]), findsNothing);
expect(find.text(snackBars[1]), findsNothing);
expect(find.text(snackBars[2]), findsNothing);
await tester.tap(find.byKey(tapTarget));
await tester.tap(find.byKey(tapTarget));
await tester.tap(find.byKey(tapTarget));
expect(find.text(snackBars[0]), findsNothing);
expect(find.text(snackBars[1]), findsNothing);
expect(find.text(snackBars[2]), findsNothing);
await tester.pump(); // schedule animation
expect(find.text(snackBars[0]), findsOneWidget);
scaffoldMessengerKey.currentState!.clearSnackBars();
expect(find.text(snackBars[0]), findsOneWidget);
await tester.pump(const Duration(seconds: 2));
expect(find.text(snackBars[0]), findsNothing);
expect(find.text(snackBars[1]), findsNothing);
expect(find.text(snackBars[2]), findsNothing);
});
Widget doBuildApp({
required SnackBarBehavior? behavior,
EdgeInsetsGeometry? margin,
double? width,
}) {
return MaterialApp(
home: Scaffold(
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.send),
onPressed: () {},
),
body: Builder(
builder: (BuildContext context) {
return GestureDetector(
onTap: () {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
behavior: behavior,
margin: margin,
width: width,
content: const Text('I am a snack bar.'),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
));
},
child: const Text('X'),
);
},
),
),
);
}
testWidgets('Setting SnackBarBehavior.fixed will still assert for margin', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/84935
await tester.pumpWidget(doBuildApp(
behavior: SnackBarBehavior.fixed,
margin: const EdgeInsets.all(8.0),
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final AssertionError exception = tester.takeException() as AssertionError;
expect(
exception.message,
'Margin can only be used with floating behavior. SnackBarBehavior.fixed '
'was set in the SnackBar constructor.',
);
});
testWidgets('Default SnackBarBehavior will still assert for margin', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/84935
await tester.pumpWidget(doBuildApp(
behavior: null,
margin: const EdgeInsets.all(8.0),
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final AssertionError exception = tester.takeException() as AssertionError;
expect(
exception.message,
'Margin can only be used with floating behavior. SnackBarBehavior.fixed '
'was set by default.',
);
});
testWidgets('Setting SnackBarBehavior.fixed will still assert for width', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/84935
await tester.pumpWidget(doBuildApp(
behavior: SnackBarBehavior.fixed,
width: 5.0,
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final AssertionError exception = tester.takeException() as AssertionError;
expect(
exception.message,
'Width can only be used with floating behavior. SnackBarBehavior.fixed '
'was set in the SnackBar constructor.',
);
});
testWidgets('Default SnackBarBehavior will still assert for width', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/84935
await tester.pumpWidget(doBuildApp(
behavior: null,
width: 5.0,
));
await tester.tap(find.text('X'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
final AssertionError exception = tester.takeException() as AssertionError;
expect(
exception.message,
'Width can only be used with floating behavior. SnackBarBehavior.fixed '
'was set by default.',
);
});
testWidgets('Snackbar by default clips BackdropFilter', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/98205
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: const Scaffold(),
floatingActionButton: FloatingActionButton(onPressed: () {}),
),
));
final ScaffoldMessengerState scaffoldMessengerState = tester.state<ScaffoldMessengerState>(
find.byType(ScaffoldMessenger),
);
scaffoldMessengerState.showSnackBar(SnackBar(
backgroundColor: Colors.transparent,
content: BackdropFilter(
filter: ImageFilter.blur(
sigmaX: 20.0,
sigmaY: 20.0,
),
child: const Text('I am a snack bar.'),
),
duration: const Duration(seconds: 2),
action: SnackBarAction(label: 'ACTION', onPressed: () {}),
behavior: SnackBarBehavior.fixed,
));
await tester.pumpAndSettle();
await tester.tap(find.text('I am a snack bar.'));
await tester.pump(); // start animation
await tester.pump(const Duration(milliseconds: 750));
await expectLater(find.byType(MaterialApp), matchesGoldenFile('snack_bar.goldenTest.backdropFilter.png'));
});
testWidgets('ScaffoldMessenger will alert for snackbars that cannot be presented', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/103004
await tester.pumpWidget(const MaterialApp(
home: Center(),
));
final ScaffoldMessengerState scaffoldMessengerState = tester.state<ScaffoldMessengerState>(
find.byType(ScaffoldMessenger),
);
expect(
() {
scaffoldMessengerState.showSnackBar(const SnackBar(
content: Text('SnackBar'),
));
},
throwsA(
isA<AssertionError>().having(
(AssertionError error) => error.toString(),
'description',
contains(
'ScaffoldMessenger.showSnackBar was called, but there are currently '
'no descendant Scaffolds to present to.'
)
),
),
);
});
}
/// Start test for "SnackBar dismiss test".
Future<void> _testSnackBarDismiss({
required WidgetTester tester,
required Key tapTarget,
required double scaffoldWidth,
required ValueChanged<DismissDirection> onDismissDirectionChange,
required VoidCallback onDragGestureChange,
}) async {
final Map<DismissDirection, List<Offset>> dragGestures = _getDragGesturesOfDismissDirections(scaffoldWidth);
for (final DismissDirection key in dragGestures.keys) {
onDismissDirectionChange(key);
for (final Offset dragGesture in dragGestures[key]!) {
onDragGestureChange();
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
await tester.tap(find.byKey(tapTarget)); // queue bar1
await tester.tap(find.byKey(tapTarget)); // queue bar2
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
await tester.pump(); // schedule animation for bar1
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(); // begin animation
expect(find.text('bar1'), findsOneWidget);
expect(find.text('bar2'), findsNothing);
await tester.pump(const Duration(milliseconds: 750)); // 0.75s // animation last frame; two second timer starts here
await tester.drag(find.text('bar1'), dragGesture);
await tester.pump(); // bar1 dismissed, bar2 begins animating
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 750)); // 0.75s // animation last frame; two second timer starts here
await tester.drag(find.text('bar2'), dragGesture);
await tester.pump(); // bar2 dismissed
expect(find.text('bar1'), findsNothing);
expect(find.text('bar2'), findsNothing);
}
}
}
/// Create drag gestures for DismissDirections.
Map<DismissDirection, List<Offset>> _getDragGesturesOfDismissDirections(double scaffoldWidth) {
final Map<DismissDirection, List<Offset>> dragGestures = <DismissDirection, List<Offset>>{};
for (final DismissDirection val in DismissDirection.values) {
switch (val) {
case DismissDirection.down:
dragGestures[val] = <Offset>[const Offset(0.0, 50.0)]; // drag to bottom gesture
break;
case DismissDirection.up:
dragGestures[val] = <Offset>[const Offset(0.0, -50.0)]; // drag to top gesture
break;
case DismissDirection.vertical:
dragGestures[val] = <Offset>[
const Offset(0.0, 50.0), // drag to bottom gesture
const Offset(0.0, -50.0), // drag to top gesture
];
break;
case DismissDirection.startToEnd:
dragGestures[val] = <Offset>[Offset(scaffoldWidth, 0.0)]; // drag to right gesture
break;
case DismissDirection.endToStart:
dragGestures[val] = <Offset>[Offset(-scaffoldWidth, 0.0)]; // drag to left gesture
break;
case DismissDirection.horizontal:
dragGestures[val] = <Offset>[
Offset(scaffoldWidth, 0.0), // drag to right gesture
Offset(-scaffoldWidth, 0.0), // drag to left gesture
];
break;
case DismissDirection.none:
break;
}
}
return dragGestures;
}