74 lines
2.5 KiB
Dart
74 lines
2.5 KiB
Dart
// Copyright 2016 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/widgets.dart';
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import 'package:flutter/rendering.dart';
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void main() {
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testWidgets('ScrollableGrid default control', (WidgetTester tester) async {
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await tester.pumpWidget(new Center(child: new ScrollableGrid(
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delegate: new FixedColumnCountGridDelegate(columnCount: 1),
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)));
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});
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// Tests https://github.com/flutter/flutter/issues/5522
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testWidgets('ScrollableGrid displays correct children with nonzero padding', (WidgetTester tester) async {
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GlobalKey<ScrollableState> scrollableKey = new GlobalKey<ScrollableState>();
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final EdgeInsets padding = new EdgeInsets.fromLTRB(0.0, 100.0, 0.0, 0.0);
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Widget testWidget = new Align(
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child: new SizedBox(
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height: 800.0,
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width: 300.0, // forces the grid children to be 300..300
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child: new ScrollableGrid(
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scrollableKey: scrollableKey,
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delegate: new FixedColumnCountGridDelegate(
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columnCount: 1,
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padding: padding
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),
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children: new List<Widget>.generate(10, (int index) {
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return new Text('$index', key: new ValueKey<int>(index));
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})
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)
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)
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);
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await tester.pumpWidget(testWidget);
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// screen is 600px high, and has the following items:
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// 100..400 = 0
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// 400..700 = 1
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await tester.pump();
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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'), findsNothing);
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expect(find.text('3'), findsNothing);
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await tester.scroll(find.text('1'), const Offset(0.0, -500.0));
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await tester.pump();
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// -100..300 = 1
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// 300..600 = 2
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// 600..600 = 3
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expect(find.text('0'), findsNothing);
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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'), findsNothing);
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expect(find.text('5'), findsNothing);
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await tester.scroll(find.text('1'), const Offset(0.0, 150.0));
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await tester.pump();
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// Child '0' is now back onscreen, but by less than `padding.top`.
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// -250..050 = 0
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// 050..450 = 1
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// 450..750 = 2
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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'), findsNothing);
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expect(find.text('4'), findsNothing);
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});
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}
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