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b5c461a917
* a11y: implement new SemanticsAction "showOnScreen" (v2) This action is triggered when the user swipes (in accessibility mode) to the last visible item of a scrollable list to bring that item fully on screen. This requires engine rolled to flutter/engine#3856. I am in the process of adding tests, but I'd like to get early feedback to see if this approach is OK. * fix null check * review comments * review comments * Add test * fix analyzer warning
81 lines
2.9 KiB
Dart
81 lines
2.9 KiB
Dart
// 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_test/flutter_test.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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import 'semantics_tester.dart';
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void main() {
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testWidgets('scrollable exposes the correct semantic actions', (WidgetTester tester) async {
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final SemanticsTester semantics = new SemanticsTester(tester);
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final List<Widget> textWidgets = <Widget>[];
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for (int i = 0; i < 80; i++)
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textWidgets.add(new Text('$i'));
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await tester.pumpWidget(new ListView(children: textWidgets));
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expect(semantics,includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollUp]));
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await flingUp(tester);
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expect(semantics, includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollUp, SemanticsAction.scrollDown]));
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await flingDown(tester, repetitions: 2);
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expect(semantics, includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollUp]));
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await flingUp(tester, repetitions: 5);
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expect(semantics, includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollDown]));
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await flingDown(tester);
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expect(semantics, includesNodeWith(actions: <SemanticsAction>[SemanticsAction.scrollUp, SemanticsAction.scrollDown]));
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});
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testWidgets('showOnScreen works in scrollable', (WidgetTester tester) async {
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new SemanticsTester(tester); // enables semantics tree generation
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const double kItemHeight = 40.0;
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final List<Widget> containers = <Widget>[];
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for (int i = 0; i < 80; i++)
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containers.add(new MergeSemantics(child: new Container(
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height: kItemHeight,
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child: new Text('container $i'),
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)));
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final ScrollController scrollController = new ScrollController(
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initialScrollOffset: kItemHeight / 2,
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);
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await tester.pumpWidget(new ListView(
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controller: scrollController,
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children: containers
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));
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expect(scrollController.offset, kItemHeight / 2);
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final int firstContainerId = tester.renderObject(find.byWidget(containers.first)).debugSemantics.id;
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tester.binding.pipelineOwner.semanticsOwner.performAction(firstContainerId, SemanticsAction.showOnScreen);
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await tester.pump();
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await tester.pump(const Duration(seconds: 5));
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expect(scrollController.offset, 0.0);
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});
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}
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Future<Null> flingUp(WidgetTester tester, { int repetitions: 1 }) async {
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while (repetitions-- > 0) {
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await tester.fling(find.byType(ListView), const Offset(0.0, -200.0), 1000.0);
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await tester.pump();
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await tester.pump(const Duration(seconds: 5));
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}
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}
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Future<Null> flingDown(WidgetTester tester, { int repetitions: 1 }) async {
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while (repetitions-- > 0) {
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await tester.fling(find.byType(ListView), const Offset(0.0, 200.0), 1000.0);
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await tester.pump();
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await tester.pump(const Duration(seconds: 5));
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}
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} |