list_view_vertical_test.dart 3.43 KB
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/widgets.dart';
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const List<int> items = <int>[0, 1, 2, 3, 4, 5];
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Widget buildFrame() {
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  return Directionality(
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    textDirection: TextDirection.ltr,
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    child: ListView(
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      itemExtent: 290.0,
      scrollDirection: Axis.vertical,
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      children: items.map<Widget>((int item) {
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        return Container(
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          child: Text('$item'),
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        );
      }).toList(),
    ),
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  );
}

void main() {
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  testWidgets('Drag vertically', (WidgetTester tester) async {
    await tester.pumpWidget(buildFrame());
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    await tester.pump();
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    await tester.drag(find.text('1'), const Offset(0.0, -300.0));
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    await tester.pump();
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    // screen is 600px high, and has the following items:
    //   -10..280 = 1
    //   280..570 = 2
    //   570..860 = 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);
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    await tester.pump();
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    await tester.drag(find.text('2'), const Offset(0.0, -290.0));
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    await tester.pump();
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    // screen is 600px high, and has the following items:
    //   -10..280 = 2
    //   280..570 = 3
    //   570..860 = 4
    expect(find.text('0'), findsNothing);
    expect(find.text('1'), findsNothing);
    expect(find.text('2'), findsOneWidget);
    expect(find.text('3'), findsOneWidget);
    expect(find.text('4'), findsOneWidget);
    expect(find.text('5'), findsNothing);
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    await tester.pump();
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    await tester.drag(find.text('3'), const Offset(-300.0, 0.0));
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    await tester.pump();
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    // nothing should have changed
    expect(find.text('0'), findsNothing);
    expect(find.text('1'), findsNothing);
    expect(find.text('2'), findsOneWidget);
    expect(find.text('3'), findsOneWidget);
    expect(find.text('4'), findsOneWidget);
    expect(find.text('5'), findsNothing);
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  });
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  testWidgets('Drag vertically', (WidgetTester tester) async {
    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
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        child: ListView(
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          itemExtent: 290.0,
          padding: const EdgeInsets.only(top: 250.0),
          scrollDirection: Axis.vertical,
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          children: items.map<Widget>((int item) {
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            return Container(
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              child: Text('$item'),
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            );
          }).toList(),
        ),
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      ),
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    );
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    await tester.pump();
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    // screen is 600px high, and has the following items:
    //   250..540 = 0
    //   540..830 = 1
    expect(find.text('0'), findsOneWidget);
    expect(find.text('1'), findsOneWidget);
    expect(find.text('2'), findsNothing);
    expect(find.text('3'), findsNothing);
    expect(find.text('4'), findsNothing);
    expect(find.text('5'), findsNothing);
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    await tester.drag(find.text('0'), const Offset(0.0, -300.0));
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    await tester.pump();
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    // screen is 600px high, and has the following items:
    //   -50..240 = 0
    //   240..530 = 1
    //   530..820 = 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);
    expect(find.text('5'), findsNothing);
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  });
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}