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f9ea1ce815
To make it easier to avoid pushing twice in one frame, provide a transaction mechanism for the navigator.
118 lines
4.6 KiB
Dart
118 lines
4.6 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/animation.dart';
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import 'package:flutter/material.dart';
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import 'package:test/test.dart';
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class ThePositiveNumbers extends ScrollableWidgetList {
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ThePositiveNumbers() : super(itemExtent: 100.0);
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ThePositiveNumbersState createState() => new ThePositiveNumbersState();
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}
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class ThePositiveNumbersState extends ScrollableWidgetListState<ThePositiveNumbers> {
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ScrollBehavior createScrollBehavior() => new UnboundedBehavior();
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int get itemCount => null;
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List<Widget> buildItems(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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void main() {
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test('whether we remember our scroll position', () {
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testWidgets((WidgetTester tester) {
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GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();
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tester.pumpWidget(new Navigator(
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key: navigatorKey,
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onGenerateRoute: (NamedRouteSettings settings) {
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if (settings.name == '/')
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return new MaterialPageRoute(builder: (_) => new Container(child: new ThePositiveNumbers()));
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else if (settings.name == '/second')
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return new MaterialPageRoute(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(tester.findText('0'), isNotNull);
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expect(tester.findText('1'), isNotNull);
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expect(tester.findText('2'), isNotNull);
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expect(tester.findText('3'), isNotNull);
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expect(tester.findText('4'), isNotNull);
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expect(tester.findText('5'), isNotNull);
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expect(tester.findText('6'), isNull);
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expect(tester.findText('10'), isNull);
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expect(tester.findText('100'), isNull);
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StatefulComponentElement<ThePositiveNumbers, ThePositiveNumbersState> target =
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tester.findElement((Element element) => element.widget is ThePositiveNumbers);
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target.state.scrollTo(1000.0);
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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(tester.findText('0'), isNull);
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expect(tester.findText('8'), isNull);
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expect(tester.findText('9'), isNull);
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expect(tester.findText('10'), isNotNull);
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expect(tester.findText('11'), isNotNull);
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expect(tester.findText('12'), isNotNull);
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expect(tester.findText('13'), isNotNull);
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expect(tester.findText('14'), isNotNull);
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expect(tester.findText('15'), isNotNull);
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expect(tester.findText('16'), isNull);
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expect(tester.findText('100'), isNull);
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navigatorKey.currentState.openTransaction(
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(NavigatorTransaction transaction) => transaction.pushNamed('/second')
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);
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tester.pump(); // navigating always takes two frames
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tester.pump(new Duration(seconds: 1));
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// same as the first list again
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expect(tester.findText('0'), isNotNull);
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expect(tester.findText('1'), isNotNull);
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expect(tester.findText('2'), isNotNull);
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expect(tester.findText('3'), isNotNull);
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expect(tester.findText('4'), isNotNull);
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expect(tester.findText('5'), isNotNull);
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expect(tester.findText('6'), isNull);
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expect(tester.findText('10'), isNull);
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expect(tester.findText('100'), isNull);
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navigatorKey.currentState.openTransaction(
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(NavigatorTransaction transaction) => transaction.pop()
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);
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tester.pump(); // navigating always takes two frames
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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(tester.findText('0'), isNull);
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expect(tester.findText('8'), isNull);
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expect(tester.findText('9'), isNull);
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expect(tester.findText('10'), isNotNull);
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expect(tester.findText('11'), isNotNull);
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expect(tester.findText('12'), isNotNull);
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expect(tester.findText('13'), isNotNull);
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expect(tester.findText('14'), isNotNull);
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expect(tester.findText('15'), isNotNull);
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expect(tester.findText('16'), isNull);
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expect(tester.findText('100'), isNull);
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});
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});
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}
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