44 lines
1.7 KiB
Dart
44 lines
1.7 KiB
Dart
// 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
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('precedingScrollExtent is reported as infinity for Sliver of unknown size', (
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WidgetTester tester,
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) async {
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await tester.pumpWidget(
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MaterialApp(
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home: CustomScrollView(
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slivers: <Widget>[
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const SliverToBoxAdapter(child: SizedBox(width: double.infinity, height: 150.0)),
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const SliverToBoxAdapter(child: SizedBox(width: double.infinity, height: 150.0)),
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SliverList.builder(
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itemBuilder: (BuildContext context, int index) {
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if (index < 100) {
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return const SizedBox(width: double.infinity, height: 150.0);
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} else {
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return null;
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}
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},
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),
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const SliverToBoxAdapter(
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key: Key('final_sliver'),
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child: SizedBox(width: double.infinity, height: 150.0),
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),
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],
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),
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),
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);
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// The last Sliver comes after a SliverList that has many more items than
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// can fit in the viewport, and the SliverList doesn't report a child count,
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// so the SliverList leads to an infinite precedingScrollExtent.
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final RenderViewport renderViewport = tester.renderObject(find.byType(Viewport));
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final RenderSliver lastRenderSliver = renderViewport.lastChild!;
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expect(lastRenderSliver.constraints.precedingScrollExtent, double.infinity);
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});
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}
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