blob: ed5e21351b882025d2eb9c2a5a96f0f366713df0 [file] [log] [blame]
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/rendering.dart';
Future<void> test(WidgetTester tester, double offset, { double anchor = 0.0 }) {
return tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
anchor: anchor / 600.0,
offset: ViewportOffset.fixed(offset),
slivers: const <Widget>[
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
],
),
),
);
}
void verify(WidgetTester tester, List<Offset> idealPositions, List<bool> idealVisibles) {
final List<Offset> actualPositions = tester.renderObjectList<RenderBox>(find.byType(SizedBox, skipOffstage: false)).map<Offset>(
(RenderBox target) => target.localToGlobal(const Offset(0.0, 0.0))
).toList();
final List<bool> actualVisibles = tester.renderObjectList<RenderSliverToBoxAdapter>(find.byType(SliverToBoxAdapter, skipOffstage: false)).map<bool>(
(RenderSliverToBoxAdapter target) => target.geometry.visible
).toList();
expect(actualPositions, equals(idealPositions));
expect(actualVisibles, equals(idealVisibles));
}
void main() {
testWidgets('Viewport basic test', (WidgetTester tester) async {
await test(tester, 0.0);
expect(tester.renderObject<RenderBox>(find.byType(Viewport)).size, equals(const Size(800.0, 600.0)));
verify(tester, <Offset>[
const Offset(0.0, 0.0),
const Offset(0.0, 400.0),
const Offset(0.0, 800.0),
const Offset(0.0, 1200.0),
const Offset(0.0, 1600.0),
], <bool>[true, true, false, false, false]);
await test(tester, 200.0);
verify(tester, <Offset>[
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
const Offset(0.0, 600.0),
const Offset(0.0, 1000.0),
const Offset(0.0, 1400.0),
], <bool>[true, true, false, false, false]);
await test(tester, 600.0);
verify(tester, <Offset>[
const Offset(0.0, -600.0),
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
const Offset(0.0, 600.0),
const Offset(0.0, 1000.0),
], <bool>[false, true, true, false, false]);
await test(tester, 900.0);
verify(tester, <Offset>[
const Offset(0.0, -900.0),
const Offset(0.0, -500.0),
const Offset(0.0, -100.0),
const Offset(0.0, 300.0),
const Offset(0.0, 700.0),
], <bool>[false, false, true, true, false]);
});
testWidgets('Viewport anchor test', (WidgetTester tester) async {
await test(tester, 0.0, anchor: 100.0);
expect(tester.renderObject<RenderBox>(find.byType(Viewport)).size, equals(const Size(800.0, 600.0)));
verify(tester, <Offset>[
const Offset(0.0, 100.0),
const Offset(0.0, 500.0),
const Offset(0.0, 900.0),
const Offset(0.0, 1300.0),
const Offset(0.0, 1700.0),
], <bool>[true, true, false, false, false]);
await test(tester, 200.0, anchor: 100.0);
verify(tester, <Offset>[
const Offset(0.0, -100.0),
const Offset(0.0, 300.0),
const Offset(0.0, 700.0),
const Offset(0.0, 1100.0),
const Offset(0.0, 1500.0),
], <bool>[true, true, false, false, false]);
await test(tester, 600.0, anchor: 100.0);
verify(tester, <Offset>[
const Offset(0.0, -500.0),
const Offset(0.0, -100.0),
const Offset(0.0, 300.0),
const Offset(0.0, 700.0),
const Offset(0.0, 1100.0),
], <bool>[false, true, true, false, false]);
await test(tester, 900.0, anchor: 100.0);
verify(tester, <Offset>[
const Offset(0.0, -800.0),
const Offset(0.0, -400.0),
const Offset(0.0, 0.0),
const Offset(0.0, 400.0),
const Offset(0.0, 800.0),
], <bool>[false, false, true, true, false]);
});
testWidgets('Multiple grids and lists', (WidgetTester tester) async {
await tester.pumpWidget(
Center(
child: SizedBox(
width: 44.4,
height: 60.0,
child: Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(
<Widget>[
Container(height: 22.2, child: const Text('TOP')),
Container(height: 22.2),
Container(height: 22.2),
],
),
),
SliverFixedExtentList(
itemExtent: 22.2,
delegate: SliverChildListDelegate(
<Widget>[
Container(),
Container(child: const Text('A')),
Container(),
],
),
),
SliverGrid(
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
),
delegate: SliverChildListDelegate(
<Widget>[
Container(),
Container(child: const Text('B')),
Container(),
],
),
),
SliverList(
delegate: SliverChildListDelegate(
<Widget>[
Container(height: 22.2),
Container(height: 22.2),
Container(height: 22.2, child: const Text('BOTTOM')),
],
),
),
],
),
),
),
),
);
final TestGesture gesture = await tester.startGesture(const Offset(400.0, 300.0));
expect(find.text('TOP'), findsOneWidget);
expect(find.text('A'), findsNothing);
expect(find.text('B'), findsNothing);
expect(find.text('BOTTOM'), findsNothing);
await gesture.moveBy(const Offset(0.0, -70.0));
await tester.pump();
expect(find.text('TOP'), findsNothing);
expect(find.text('A'), findsOneWidget);
expect(find.text('B'), findsNothing);
expect(find.text('BOTTOM'), findsNothing);
await gesture.moveBy(const Offset(0.0, -70.0));
await tester.pump();
expect(find.text('TOP'), findsNothing);
expect(find.text('A'), findsNothing);
expect(find.text('B'), findsOneWidget);
expect(find.text('BOTTOM'), findsNothing);
await gesture.moveBy(const Offset(0.0, -70.0));
await tester.pump();
expect(find.text('TOP'), findsNothing);
expect(find.text('A'), findsNothing);
expect(find.text('B'), findsNothing);
expect(find.text('BOTTOM'), findsOneWidget);
});
testWidgets('Can override ErrorWidget.build', (WidgetTester tester) async {
const Text errorText = Text('error');
final ErrorWidgetBuilder oldBuilder = ErrorWidget.builder;
ErrorWidget.builder = (FlutterErrorDetails details) => errorText;
final SliverChildBuilderDelegate builderThrowsDelegate = SliverChildBuilderDelegate(
(_, __) => throw 'builder',
addAutomaticKeepAlives: false,
addRepaintBoundaries: false,
addSemanticIndexes: false,
);
final KeyedSubtree wrapped = builderThrowsDelegate.build(null, 0);
expect(wrapped.child, errorText);
expect(tester.takeException(), 'builder');
ErrorWidget.builder = oldBuilder;
});
}