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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/material.dart';
class TestIcon extends StatefulWidget {
const TestIcon({Key? key}) : super(key: key);
@override
TestIconState createState() => TestIconState();
}
class TestIconState extends State<TestIcon> {
late IconThemeData iconTheme;
@override
Widget build(BuildContext context) {
iconTheme = IconTheme.of(context);
return const Icon(Icons.expand_more);
}
}
class TestText extends StatefulWidget {
const TestText(this.text, {Key? key}) : super(key: key);
final String text;
@override
TestTextState createState() => TestTextState();
}
class TestTextState extends State<TestText> {
late TextStyle textStyle;
@override
Widget build(BuildContext context) {
textStyle = DefaultTextStyle.of(context).style;
return Text(widget.text);
}
}
void main() {
const Color _dividerColor = Color(0x1f333333);
const Color _accentColor = Colors.blueAccent;
const Color _unselectedWidgetColor = Colors.black54;
const Color _headerColor = Colors.black45;
testWidgets('ExpansionTile initial state', (WidgetTester tester) async {
final Key topKey = UniqueKey();
const Key expandedKey = PageStorageKey<String>('expanded');
const Key collapsedKey = PageStorageKey<String>('collapsed');
const Key defaultKey = PageStorageKey<String>('default');
final Key tileKey = UniqueKey();
await tester.pumpWidget(MaterialApp(
theme: ThemeData(
dividerColor: _dividerColor,
),
home: Material(
child: SingleChildScrollView(
child: Column(
children: <Widget>[
ListTile(title: const Text('Top'), key: topKey),
ExpansionTile(
key: expandedKey,
initiallyExpanded: true,
title: const Text('Expanded'),
backgroundColor: Colors.red,
children: <Widget>[
ListTile(
key: tileKey,
title: const Text('0'),
),
],
),
ExpansionTile(
key: collapsedKey,
initiallyExpanded: false,
title: const Text('Collapsed'),
children: <Widget>[
ListTile(
key: tileKey,
title: const Text('0'),
),
],
),
const ExpansionTile(
key: defaultKey,
title: Text('Default'),
children: <Widget>[
ListTile(title: Text('0')),
],
),
],
),
),
),
));
double getHeight(Key key) => tester.getSize(find.byKey(key)).height;
Container getContainer(Key key) => tester.firstWidget(find.descendant(
of: find.byKey(key),
matching: find.byType(Container),
));
expect(getHeight(topKey), getHeight(expandedKey) - getHeight(tileKey) - 2.0);
expect(getHeight(topKey), getHeight(collapsedKey) - 2.0);
expect(getHeight(topKey), getHeight(defaultKey) - 2.0);
BoxDecoration expandedContainerDecoration = getContainer(expandedKey).decoration! as BoxDecoration;
expect(expandedContainerDecoration.color, Colors.red);
expect(expandedContainerDecoration.border!.top.color, _dividerColor);
expect(expandedContainerDecoration.border!.bottom.color, _dividerColor);
BoxDecoration collapsedContainerDecoration = getContainer(collapsedKey).decoration! as BoxDecoration;
expect(collapsedContainerDecoration.color, Colors.transparent);
expect(collapsedContainerDecoration.border!.top.color, Colors.transparent);
expect(collapsedContainerDecoration.border!.bottom.color, Colors.transparent);
await tester.tap(find.text('Expanded'));
await tester.tap(find.text('Collapsed'));
await tester.tap(find.text('Default'));
await tester.pump();
// Pump to the middle of the animation for expansion.
await tester.pump(const Duration(milliseconds: 100));
final BoxDecoration collapsingContainerDecoration = getContainer(collapsedKey).decoration! as BoxDecoration;
expect(collapsingContainerDecoration.color, Colors.transparent);
// Opacity should change but color component should remain the same.
expect(collapsingContainerDecoration.border!.top.color, const Color(0x15333333));
expect(collapsingContainerDecoration.border!.bottom.color, const Color(0x15333333));
// Pump all the way to the end now.
await tester.pump(const Duration(seconds: 1));
expect(getHeight(topKey), getHeight(expandedKey) - 2.0);
expect(getHeight(topKey), getHeight(collapsedKey) - getHeight(tileKey) - 2.0);
expect(getHeight(topKey), getHeight(defaultKey) - getHeight(tileKey) - 2.0);
// Expanded should be collapsed now.
expandedContainerDecoration = getContainer(expandedKey).decoration! as BoxDecoration;
expect(expandedContainerDecoration.color, Colors.transparent);
expect(expandedContainerDecoration.border!.top.color, Colors.transparent);
expect(expandedContainerDecoration.border!.bottom.color, Colors.transparent);
// Collapsed should be expanded now.
collapsedContainerDecoration = getContainer(collapsedKey).decoration! as BoxDecoration;
expect(collapsedContainerDecoration.color, Colors.transparent);
expect(collapsedContainerDecoration.border!.top.color, _dividerColor);
expect(collapsedContainerDecoration.border!.bottom.color, _dividerColor);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('ListTileTheme', (WidgetTester tester) async {
final Key expandedTitleKey = UniqueKey();
final Key collapsedTitleKey = UniqueKey();
final Key expandedIconKey = UniqueKey();
final Key collapsedIconKey = UniqueKey();
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
accentColor: _accentColor,
unselectedWidgetColor: _unselectedWidgetColor,
textTheme: const TextTheme(subtitle1: TextStyle(color: _headerColor)),
),
home: Material(
child: SingleChildScrollView(
child: Column(
children: <Widget>[
const ListTile(title: Text('Top')),
ExpansionTile(
initiallyExpanded: true,
title: TestText('Expanded', key: expandedTitleKey),
backgroundColor: Colors.red,
children: const <Widget>[ListTile(title: Text('0'))],
trailing: TestIcon(key: expandedIconKey),
),
ExpansionTile(
initiallyExpanded: false,
title: TestText('Collapsed', key: collapsedTitleKey),
children: const <Widget>[ListTile(title: Text('0'))],
trailing: TestIcon(key: collapsedIconKey),
),
],
),
),
),
),
);
Color iconColor(Key key) => tester.state<TestIconState>(find.byKey(key)).iconTheme.color!;
Color textColor(Key key) => tester.state<TestTextState>(find.byKey(key)).textStyle.color!;
expect(textColor(expandedTitleKey), _accentColor);
expect(textColor(collapsedTitleKey), _headerColor);
expect(iconColor(expandedIconKey), _accentColor);
expect(iconColor(collapsedIconKey), _unselectedWidgetColor);
// Tap both tiles to change their state: collapse and extend respectively
await tester.tap(find.text('Expanded'));
await tester.tap(find.text('Collapsed'));
await tester.pump();
await tester.pump(const Duration(seconds: 1));
await tester.pump(const Duration(seconds: 1));
expect(textColor(expandedTitleKey), _headerColor);
expect(textColor(collapsedTitleKey), _accentColor);
expect(iconColor(expandedIconKey), _unselectedWidgetColor);
expect(iconColor(collapsedIconKey), _accentColor);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('ExpansionTile subtitle', (WidgetTester tester) async {
await tester.pumpWidget(
const MaterialApp(
home: Scaffold(
body: ExpansionTile(
title: Text('Title'),
subtitle: Text('Subtitle'),
children: <Widget>[ListTile(title: Text('0'))],
),
),
),
);
expect(find.text('Subtitle'), findsOneWidget);
});
testWidgets('ExpansionTile maintainState', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
platform: TargetPlatform.iOS,
dividerColor: _dividerColor,
),
home: Material(
child: SingleChildScrollView(
child: Column(
children: const <Widget>[
ExpansionTile(
title: Text('Tile 1'),
initiallyExpanded: false,
maintainState: true,
children: <Widget>[
Text('Maintaining State'),
],
),
ExpansionTile(
title: Text('Title 2'),
initiallyExpanded: false,
maintainState: false,
children: <Widget>[
Text('Discarding State'),
],
),
],
),
),
),
));
// This text should be offstage while ExpansionTile collapsed
expect(find.text('Maintaining State', skipOffstage: false), findsOneWidget);
expect(find.text('Maintaining State'), findsNothing);
// This text shouldn't be there while ExpansionTile collapsed
expect(find.text('Discarding State'), findsNothing);
});
testWidgets('ExpansionTile padding test', (WidgetTester tester) async {
await tester.pumpWidget(const MaterialApp(
home: Material(
child: Center(
child: ExpansionTile(
title: Text('Hello'),
tilePadding: EdgeInsets.fromLTRB(8, 12, 4, 10),
),
),
),
));
final Rect titleRect = tester.getRect(find.text('Hello'));
final Rect trailingRect = tester.getRect(find.byIcon(Icons.expand_more));
final Rect listTileRect = tester.getRect(find.byType(ListTile));
final Rect tallerWidget = titleRect.height > trailingRect.height ? titleRect : trailingRect;
// Check the positions of title and trailing Widgets, after padding is applied.
expect(listTileRect.left, titleRect.left - 8);
expect(listTileRect.right, trailingRect.right + 4);
// Calculate the remaining height of ListTile from the default height.
final double remainingHeight = 56 - tallerWidget.height;
expect(listTileRect.top, tallerWidget.top - remainingHeight / 2 - 12);
expect(listTileRect.bottom, tallerWidget.bottom + remainingHeight / 2 + 10);
});
testWidgets('ExpansionTile expandedAlignment test', (WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
home: Material(
child: Center(
child: ExpansionTile(
title: const Text('title'),
expandedAlignment: Alignment.centerLeft,
children: <Widget>[
Container(height: 100, width: 100),
Container(height: 100, width: 80),
],
),
),
),
));
await tester.tap(find.text('title'));
await tester.pumpAndSettle();
final Rect columnRect = tester.getRect(find.byType(Column).last);
// The expandedAlignment is used to define the alignment of the Column widget in
// expanded tile, not the alignment of the children inside the Column.
expect(columnRect.left, 0.0);
// The width of the Column is the width of the largest child. The largest width
// being 100.0, the offset of the right edge of Column from X-axis should be 100.0.
expect(columnRect.right, 100.0);
});
testWidgets('ExpansionTile expandedCrossAxisAlignment test', (WidgetTester tester) async {
const Key child0Key = Key('child0');
const Key child1Key = Key('child1');
await tester.pumpWidget(MaterialApp(
home: Material(
child: Center(
child: ExpansionTile(
title: const Text('title'),
// Set the column's alignment to Alignment.centerRight to test CrossAxisAlignment
// of children widgets. This helps distinguish the effect of expandedAlignment
// and expandedCrossAxisAlignment later in the test.
expandedAlignment: Alignment.centerRight,
expandedCrossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Container(height: 100, width: 100, key: child0Key),
Container(height: 100, width: 80, key: child1Key),
],
),
),
),
));
await tester.tap(find.text('title'));
await tester.pumpAndSettle();
final Rect columnRect = tester.getRect(find.byType(Column).last);
final Rect child0Rect = tester.getRect(find.byKey(child0Key));
final Rect child1Rect = tester.getRect(find.byKey(child1Key));
// Since expandedAlignment is set to Alignment.centerRight, the column of children
// should be aligned to the center right of the expanded tile. This provides confirmation
// that the expandedCrossAxisAlignment.start is 700.0, where columnRect.left is.
expect(columnRect.right, 800.0);
// The width of the Column is the width of the largest child. The largest width
// being 100.0, the offset of the left edge of Column from X-axis should be 700.0.
expect(columnRect.left, 700.0);
// Considering the value of expandedCrossAxisAlignment is CrossAxisAlignment.start,
// the offset of the left edge of both the children from X-axis should be 700.0.
expect(child0Rect.left, 700.0);
expect(child1Rect.left, 700.0);
});
testWidgets('CrossAxisAlignment.baseline is not allowed', (WidgetTester tester) async {
try {
MaterialApp(
home: Material(
child: ExpansionTile(
initiallyExpanded: true,
title: const Text('title'),
expandedCrossAxisAlignment: CrossAxisAlignment.baseline,
),
),
);
} on AssertionError catch (error) {
expect(error.toString(), contains('CrossAxisAlignment.baseline is not supported since the expanded'
' children are aligned in a column, not a row. Try to use another constant.'));
return;
}
fail('AssertionError was not thrown when expandedCrossAxisAlignment is CrossAxisAlignment.baseline.');
});
testWidgets('expandedCrossAxisAlignment and expandedAlignment default values', (WidgetTester tester) async {
const Key child1Key = Key('child1');
await tester.pumpWidget(MaterialApp(
home: Material(
child: Center(
child: ExpansionTile(
title: const Text('title'),
children: <Widget>[
Container(height: 100, width: 100),
Container(height: 100, width: 80, key: child1Key),
],
),
),
),
));
await tester.tap(find.text('title'));
await tester.pumpAndSettle();
final Rect columnRect = tester.getRect(find.byType(Column).last);
final Rect child1Rect = tester.getRect(find.byKey(child1Key));
// The default viewport size is Size(800, 600).
// By default the value of extendedAlignment is Alignment.center, hence the offset
// of left and right edges from x axis should be equal.
expect(columnRect.left, 800 - columnRect.right);
// By default the value of extendedCrossAxisAlignment is CrossAxisAlignment.center, hence
// the offset of left and right edges from Column should be equal.
expect(child1Rect.left - columnRect.left, columnRect.right - child1Rect.right);
});
testWidgets('childrenPadding default value', (WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
home: Material(
child: Center(
child: ExpansionTile(
title: const Text('title'),
children: <Widget>[
Container(height: 100, width: 100),
],
),
),
),
));
await tester.tap(find.text('title'));
await tester.pumpAndSettle();
final Rect columnRect = tester.getRect(find.byType(Column).last);
final Rect paddingRect = tester.getRect(find.byType(Padding).last);
// By default, the value of childrenPadding is EdgeInsets.zero, hence offset
// of all the edges from x-axis and y-axis should be equal for Padding and Column.
expect(columnRect.top, paddingRect.top);
expect(columnRect.left, paddingRect.left);
expect(columnRect.right, paddingRect.right);
expect(columnRect.bottom, paddingRect.bottom);
});
testWidgets('ExpansionTile childrenPadding test', (WidgetTester tester) async {
await tester.pumpWidget(MaterialApp(
home: Material(
child: Center(
child: ExpansionTile(
title: const Text('title'),
childrenPadding: const EdgeInsets.fromLTRB(10, 8, 12, 4),
children: <Widget>[
Container(height: 100, width: 100),
],
),
),
),
));
await tester.tap(find.text('title'));
await tester.pumpAndSettle();
final Rect columnRect = tester.getRect(find.byType(Column).last);
final Rect paddingRect = tester.getRect(find.byType(Padding).last);
// Check the offset of all the edges from x-axis and y-axis after childrenPadding
// is applied.
expect(columnRect.left, paddingRect.left + 10);
expect(columnRect.top, paddingRect.top + 8);
expect(columnRect.right, paddingRect.right - 12);
expect(columnRect.bottom, paddingRect.bottom - 4);
});
}