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// Copyright 2015 The Chromium 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:test/test.dart';
const List<int> items = const <int>[0, 1, 2, 3, 4, 5];
Widget buildFrame() {
return new ScrollableList(
itemExtent: 290.0,
scrollDirection: Axis.vertical,
children: items.map((int item) {
return new Container(
child: new Text('$item')
);
})
);
}
void main() {
test('Drag vertically', () {
testWidgets((WidgetTester tester) {
tester.pumpWidget(buildFrame());
tester.pump();
tester.scroll(tester.findText('1'), const Offset(0.0, -300.0));
tester.pump();
// screen is 600px high, and has the following items:
// -10..280 = 1
// 280..570 = 2
// 570..860 = 3
expect(tester.findText('0'), isNull);
expect(tester.findText('1'), isNotNull);
expect(tester.findText('2'), isNotNull);
expect(tester.findText('3'), isNotNull);
expect(tester.findText('4'), isNull);
expect(tester.findText('5'), isNull);
tester.pump();
tester.scroll(tester.findText('2'), const Offset(0.0, -290.0));
tester.pump();
// screen is 600px high, and has the following items:
// -10..280 = 2
// 280..570 = 3
// 570..860 = 4
expect(tester.findText('0'), isNull);
expect(tester.findText('1'), isNull);
expect(tester.findText('2'), isNotNull);
expect(tester.findText('3'), isNotNull);
expect(tester.findText('4'), isNotNull);
expect(tester.findText('5'), isNull);
tester.pump();
tester.scroll(tester.findText('3'), const Offset(-300.0, 0.0));
tester.pump();
// nothing should have changed
expect(tester.findText('0'), isNull);
expect(tester.findText('1'), isNull);
expect(tester.findText('2'), isNotNull);
expect(tester.findText('3'), isNotNull);
expect(tester.findText('4'), isNotNull);
expect(tester.findText('5'), isNull);
});
});
test('Drag vertically', () {
testWidgets((WidgetTester tester) {
tester.pumpWidget(
new ScrollableList(
itemExtent: 290.0,
padding: new EdgeInsets.only(top: 250.0),
scrollDirection: Axis.vertical,
children: items.map((int item) {
return new Container(
child: new Text('$item')
);
})
)
);
tester.pump();
// screen is 600px high, and has the following items:
// 250..540 = 0
// 540..830 = 1
expect(tester.findText('0'), isNotNull);
expect(tester.findText('1'), isNotNull);
expect(tester.findText('2'), isNull);
expect(tester.findText('3'), isNull);
expect(tester.findText('4'), isNull);
expect(tester.findText('5'), isNull);
tester.scroll(tester.findText('0'), const Offset(0.0, -300.0));
tester.pump();
// screen is 600px high, and has the following items:
// -50..240 = 0
// 240..530 = 1
// 530..820 = 2
expect(tester.findText('0'), isNotNull);
expect(tester.findText('1'), isNotNull);
expect(tester.findText('2'), isNotNull);
expect(tester.findText('3'), isNull);
expect(tester.findText('4'), isNull);
expect(tester.findText('5'), isNull);
});
});
}