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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';
void main() {
testWidgets('GridView default control', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Center(
child: GridView.count(
crossAxisCount: 1,
),
),
),
);
});
// Tests https://github.com/flutter/flutter/issues/5522
testWidgets('GridView displays correct children with nonzero padding', (WidgetTester tester) async {
const EdgeInsets padding = EdgeInsets.fromLTRB(0.0, 100.0, 0.0, 0.0);
final Widget testWidget = Directionality(
textDirection: TextDirection.ltr,
child: Align(
child: SizedBox(
height: 800.0,
width: 300.0, // forces the grid children to be 300..300
child: GridView.count(
crossAxisCount: 1,
padding: padding,
children: List<Widget>.generate(10, (int index) {
return Text('$index', key: ValueKey<int>(index));
}).toList(),
),
),
),
);
await tester.pumpWidget(testWidget);
// screen is 600px high, and has the following items:
// 100..400 = 0
// 400..700 = 1
await tester.pump();
expect(find.text('0'), findsOneWidget);
expect(find.text('1'), findsOneWidget);
expect(find.text('2'), findsNothing);
expect(find.text('3'), findsNothing);
await tester.drag(find.text('1'), const Offset(0.0, -500.0));
await tester.pump();
// -100..300 = 1
// 300..600 = 2
// 600..600 = 3
expect(find.text('0'), findsNothing);
expect(find.text('1'), findsOneWidget);
expect(find.text('2'), findsOneWidget);
expect(find.text('3'), findsOneWidget);
expect(find.text('4'), findsNothing);
expect(find.text('5'), findsNothing);
await tester.drag(find.text('1'), const Offset(0.0, 150.0));
await tester.pump();
// Child '0' is now back onscreen, but by less than `padding.top`.
// -250..050 = 0
// 050..450 = 1
// 450..750 = 2
expect(find.text('0'), findsOneWidget);
expect(find.text('1'), findsOneWidget);
expect(find.text('2'), findsOneWidget);
expect(find.text('3'), findsNothing);
expect(find.text('4'), findsNothing);
});
testWidgets('GridView.count() fixed itemExtent, scroll to end, append, scroll', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/9506
Widget buildFrame(int itemCount) {
return Directionality(
textDirection: TextDirection.ltr,
child: GridView.count(
crossAxisCount: itemCount,
children: List<Widget>.generate(itemCount, (int index) {
return SizedBox(
height: 200.0,
child: Text('item $index'),
);
}),
),
);
}
await tester.pumpWidget(buildFrame(3));
expect(find.text('item 0'), findsOneWidget);
expect(find.text('item 1'), findsOneWidget);
expect(find.text('item 2'), findsOneWidget);
await tester.pumpWidget(buildFrame(4));
final TestGesture gesture = await tester.startGesture(const Offset(0.0, 300.0));
await gesture.moveBy(const Offset(0.0, -200.0));
await tester.pumpAndSettle();
expect(find.text('item 3'), findsOneWidget);
});
}