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bec3fdefd1
* Add a Scrollable builder, refactor ScrollableList, et al * Add space between the dialog demo buttons * removed vestigial code
108 lines
4.1 KiB
Dart
108 lines
4.1 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/material.dart';
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class ThePositiveNumbers extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return new ScrollableLazyList(
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itemExtent: 100.0,
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itemBuilder: (BuildContext context, int start, int count) {
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List<Widget> result = new List<Widget>();
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for (int index = start; index < start + count; index += 1)
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result.add(new Text('$index', key: new ValueKey<int>(index)));
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return result;
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}
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);
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}
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}
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void main() {
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testWidgets('whether we remember our scroll position', (WidgetTester tester) async {
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GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();
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await tester.pumpWidget(new Navigator(
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key: navigatorKey,
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onGenerateRoute: (RouteSettings settings) {
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if (settings.name == '/')
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return new MaterialPageRoute<Null>(builder: (_) => new Container(child: new ThePositiveNumbers()));
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else if (settings.name == '/second')
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return new MaterialPageRoute<Null>(builder: (_) => new Container(child: new ThePositiveNumbers()));
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return null;
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}
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));
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// we're 600 pixels high, each item is 100 pixels high, scroll position is
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// zero, so we should have exactly 6 items, 0..5.
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expect(find.text('0'), findsOneWidget);
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expect(find.text('1'), findsOneWidget);
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expect(find.text('2'), findsOneWidget);
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expect(find.text('3'), findsOneWidget);
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expect(find.text('4'), findsOneWidget);
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expect(find.text('5'), findsOneWidget);
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expect(find.text('6'), findsNothing);
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expect(find.text('10'), findsNothing);
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expect(find.text('100'), findsNothing);
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ScrollableState targetState = tester.state(find.byType(Scrollable));
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targetState.scrollTo(1000.0);
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await tester.pump(new Duration(seconds: 1));
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// we're 600 pixels high, each item is 100 pixels high, scroll position is
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// 1000, so we should have exactly 6 items, 10..15.
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expect(find.text('0'), findsNothing);
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expect(find.text('8'), findsNothing);
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expect(find.text('9'), findsNothing);
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expect(find.text('10'), findsOneWidget);
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expect(find.text('11'), findsOneWidget);
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expect(find.text('12'), findsOneWidget);
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expect(find.text('13'), findsOneWidget);
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expect(find.text('14'), findsOneWidget);
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expect(find.text('15'), findsOneWidget);
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expect(find.text('16'), findsNothing);
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expect(find.text('100'), findsNothing);
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navigatorKey.currentState.openTransaction(
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(NavigatorTransaction transaction) => transaction.pushNamed('/second')
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);
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await tester.pump(); // navigating always takes two frames
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await tester.pump(new Duration(seconds: 1));
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// same as the first list again
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expect(find.text('0'), findsOneWidget);
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expect(find.text('1'), findsOneWidget);
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expect(find.text('2'), findsOneWidget);
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expect(find.text('3'), findsOneWidget);
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expect(find.text('4'), findsOneWidget);
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expect(find.text('5'), findsOneWidget);
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expect(find.text('6'), findsNothing);
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expect(find.text('10'), findsNothing);
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expect(find.text('100'), findsNothing);
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navigatorKey.currentState.openTransaction(
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(NavigatorTransaction transaction) => transaction.pop()
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);
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await tester.pump(); // navigating always takes two frames
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await tester.pump(new Duration(seconds: 1));
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// we're 600 pixels high, each item is 100 pixels high, scroll position is
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// 1000, so we should have exactly 6 items, 10..15.
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expect(find.text('0'), findsNothing);
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expect(find.text('8'), findsNothing);
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expect(find.text('9'), findsNothing);
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expect(find.text('10'), findsOneWidget);
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expect(find.text('11'), findsOneWidget);
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expect(find.text('12'), findsOneWidget);
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expect(find.text('13'), findsOneWidget);
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expect(find.text('14'), findsOneWidget);
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expect(find.text('15'), findsOneWidget);
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expect(find.text('16'), findsNothing);
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expect(find.text('100'), findsNothing);
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});
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}
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