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Add:创建 flutter go web 版
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ryan
392
packages/flutter_web/test/widgets/scroll_controller_test.dart
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392
packages/flutter_web/test/widgets/scroll_controller_test.dart
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// Copyright 2017 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_web_test/flutter_web_test.dart';
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import 'package:flutter_web/widgets.dart';
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import 'states.dart';
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void main() {
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testWidgets('ScrollController control test', (WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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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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controller: controller,
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children: kStates.map<Widget>((String state) {
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return Container(
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height: 200.0,
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child: Text(state),
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);
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}).toList(),
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),
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),
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);
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double realOffset() {
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return tester
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.state<ScrollableState>(find.byType(Scrollable))
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.position
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.pixels;
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}
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expect(controller.offset, equals(0.0));
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expect(realOffset(), equals(controller.offset));
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controller.jumpTo(653.0);
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expect(controller.offset, equals(653.0));
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expect(realOffset(), equals(controller.offset));
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await tester.pump();
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expect(controller.offset, equals(653.0));
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expect(realOffset(), equals(controller.offset));
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controller.animateTo(326.0,
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duration: const Duration(milliseconds: 300), curve: Curves.ease);
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await tester.pumpAndSettle(const Duration(milliseconds: 100));
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expect(controller.offset, equals(326.0));
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expect(realOffset(), equals(controller.offset));
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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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key: const Key('second'),
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controller: controller,
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children: kStates.map<Widget>((String state) {
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return Container(
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height: 200.0,
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child: Text(state),
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);
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}).toList(),
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),
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),
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);
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expect(controller.offset, equals(0.0));
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expect(realOffset(), equals(controller.offset));
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controller.jumpTo(653.0);
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expect(controller.offset, equals(653.0));
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expect(realOffset(), equals(controller.offset));
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final ScrollController controller2 = ScrollController();
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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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key: const Key('second'),
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controller: controller2,
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children: kStates.map<Widget>((String state) {
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return Container(
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height: 200.0,
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child: Text(state),
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);
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}).toList(),
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),
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),
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);
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expect(() => controller.offset, throwsAssertionError);
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expect(controller2.offset, equals(653.0));
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expect(realOffset(), equals(controller2.offset));
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expect(() => controller.jumpTo(120.0), throwsAssertionError);
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expect(
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() => controller.animateTo(132.0,
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duration: const Duration(milliseconds: 300), curve: Curves.ease),
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throwsAssertionError);
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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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key: const Key('second'),
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controller: controller2,
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physics: const BouncingScrollPhysics(),
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children: kStates.map<Widget>((String state) {
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return Container(
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height: 200.0,
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child: Text(state),
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);
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}).toList(),
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),
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),
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);
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expect(controller2.offset, equals(653.0));
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expect(realOffset(), equals(controller2.offset));
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controller2.jumpTo(432.0);
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expect(controller2.offset, equals(432.0));
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expect(realOffset(), equals(controller2.offset));
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await tester.pump();
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expect(controller2.offset, equals(432.0));
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expect(realOffset(), equals(controller2.offset));
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});
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testWidgets('ScrollController control test', (WidgetTester tester) async {
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final ScrollController controller = ScrollController(
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initialScrollOffset: 209.0,
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);
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: GridView.count(
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crossAxisCount: 4,
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controller: controller,
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children: kStates.map<Widget>((String state) => Text(state)).toList(),
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),
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),
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);
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double realOffset() {
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return tester
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.state<ScrollableState>(find.byType(Scrollable))
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.position
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.pixels;
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}
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expect(controller.offset, equals(209.0));
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expect(realOffset(), equals(controller.offset));
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controller.jumpTo(105.0);
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await tester.pump();
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expect(controller.offset, equals(105.0));
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expect(realOffset(), equals(controller.offset));
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: GridView.count(
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crossAxisCount: 2,
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controller: controller,
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children: kStates.map<Widget>((String state) => Text(state)).toList(),
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),
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),
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);
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expect(controller.offset, equals(105.0));
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expect(realOffset(), equals(controller.offset));
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});
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testWidgets('DrivenScrollActivity ending after dispose',
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(WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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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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controller: controller,
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children: <Widget>[Container(height: 200000.0)],
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),
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),
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);
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controller.animateTo(1000.0,
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duration: const Duration(seconds: 1), curve: Curves.linear);
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await tester.pump(); // Start the animation.
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// We will now change the tree on the same frame as the animation ends.
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await tester.pumpWidget(Container(), const Duration(seconds: 2));
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});
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testWidgets('Read operations on ScrollControllers with no positions fail',
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(WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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expect(() => controller.offset, throwsAssertionError);
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expect(() => controller.position, throwsAssertionError);
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});
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testWidgets(
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'Read operations on ScrollControllers with more than one position fail',
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(WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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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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children: <Widget>[
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Container(
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constraints: const BoxConstraints(maxHeight: 500.0),
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child: ListView(
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controller: controller,
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children: kStates.map<Widget>((String state) {
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return Container(height: 200.0, child: Text(state));
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}).toList(),
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),
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),
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Container(
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constraints: const BoxConstraints(maxHeight: 500.0),
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child: ListView(
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controller: controller,
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children: kStates.map<Widget>((String state) {
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return Container(height: 200.0, child: Text(state));
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}).toList(),
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),
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),
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],
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),
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),
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);
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expect(() => controller.offset, throwsAssertionError);
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expect(() => controller.position, throwsAssertionError);
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});
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testWidgets('Write operations on ScrollControllers with no positions fail',
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(WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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expect(
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() => controller.animateTo(1.0,
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duration: const Duration(seconds: 1), curve: Curves.linear),
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throwsAssertionError);
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expect(() => controller.jumpTo(1.0), throwsAssertionError);
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});
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testWidgets(
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'Write operations on ScrollControllers with more than one position do not throw',
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(WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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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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children: <Widget>[
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Container(
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constraints: const BoxConstraints(maxHeight: 500.0),
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child: ListView(
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controller: controller,
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children: kStates.map<Widget>((String state) {
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return Container(height: 200.0, child: Text(state));
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}).toList(),
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),
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),
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Container(
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constraints: const BoxConstraints(maxHeight: 500.0),
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child: ListView(
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controller: controller,
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children: kStates.map<Widget>((String state) {
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return Container(height: 200.0, child: Text(state));
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}).toList(),
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),
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),
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],
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),
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),
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);
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controller.jumpTo(1.0);
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controller.animateTo(1.0,
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duration: const Duration(seconds: 1), curve: Curves.linear);
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await tester.pumpAndSettle();
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});
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testWidgets('Scroll controllers notify when the position changes',
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(WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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final List<double> log = <double>[];
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controller.addListener(() {
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log.add(controller.offset);
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});
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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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controller: controller,
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children: kStates.map<Widget>((String state) {
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return Container(height: 200.0, child: Text(state));
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}).toList(),
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),
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),
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);
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expect(log, isEmpty);
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await tester.drag(find.byType(ListView), const Offset(0.0, -250.0));
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expect(log, equals(<double>[20.0, 250.0]));
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log.clear();
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controller.dispose();
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await tester.drag(find.byType(ListView), const Offset(0.0, -130.0));
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expect(log, isEmpty);
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});
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testWidgets('keepScrollOffset', (WidgetTester tester) async {
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final PageStorageBucket bucket = PageStorageBucket();
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Widget buildFrame(ScrollController controller) {
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return Directionality(
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textDirection: TextDirection.ltr,
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child: PageStorage(
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bucket: bucket,
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child: KeyedSubtree(
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key: const PageStorageKey<String>('ListView'),
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child: ListView(
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key: UniqueKey(), // it's a different ListView every time
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controller: controller,
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children: List<Widget>.generate(50, (int index) {
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return Container(height: 100.0, child: Text('Item $index'));
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}).toList(),
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),
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),
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),
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);
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}
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// keepScrollOffset: true (the default). The scroll offset is restored
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// when the ListView is recreated with a new ScrollController.
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// The initialScrollOffset is used in this case, because there's no saved
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// scroll offset.
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ScrollController controller = ScrollController(initialScrollOffset: 200.0);
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await tester.pumpWidget(buildFrame(controller));
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expect(tester.getTopLeft(find.widgetWithText(Container, 'Item 2')),
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Offset.zero);
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controller.jumpTo(2000.0);
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await tester.pump();
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expect(tester.getTopLeft(find.widgetWithText(Container, 'Item 20')),
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Offset.zero);
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// The initialScrollOffset isn't used in this case, because the scrolloffset
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// can be restored.
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controller = ScrollController(initialScrollOffset: 25.0);
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await tester.pumpWidget(buildFrame(controller));
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expect(controller.offset, 2000.0);
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expect(tester.getTopLeft(find.widgetWithText(Container, 'Item 20')),
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Offset.zero);
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// keepScrollOffset: false. The scroll offset is -not- restored
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// when the ListView is recreated with a new ScrollController and
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// the initialScrollOffset is used.
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controller =
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ScrollController(keepScrollOffset: false, initialScrollOffset: 100.0);
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await tester.pumpWidget(buildFrame(controller));
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expect(controller.offset, 100.0);
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expect(tester.getTopLeft(find.widgetWithText(Container, 'Item 1')),
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Offset.zero);
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});
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}
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