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// Copyright 2014 The Flutter 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/rendering.dart';
import 'package:flutter/widgets.dart';
import '../rendering/mock_canvas.dart';
Future<void> test(WidgetTester tester, double offset) {
return tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.fixed(offset),
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(const <Widget>[
SizedBox(height: 400.0, child: Text('a')),
SizedBox(height: 400.0, child: Text('b')),
SizedBox(height: 400.0, child: Text('c')),
SizedBox(height: 400.0, child: Text('d')),
SizedBox(height: 400.0, child: Text('e')),
]),
),
],
),
),
);
}
Future<void> testWithConstChildDelegate(WidgetTester tester, double offset) {
return tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.fixed(offset),
slivers: const <Widget>[
SliverList(
delegate: SliverChildListDelegate.fixed(<Widget>[
SizedBox(height: 400.0, child: Text('a')),
SizedBox(height: 400.0, child: Text('b')),
SizedBox(height: 400.0, child: Text('c')),
SizedBox(height: 400.0, child: Text('d')),
SizedBox(height: 400.0, child: Text('e')),
]),
),
],
),
),
);
}
void verify(WidgetTester tester, List<Offset> answerKey, String text) {
final List<Offset> testAnswers = tester.renderObjectList<RenderBox>(find.byType(SizedBox)).map<Offset>(
(RenderBox target) => target.localToGlobal(const Offset(0.0, 0.0))
).toList();
expect(testAnswers, equals(answerKey));
final String foundText =
tester.widgetList<Text>(find.byType(Text))
.map<String>((Text widget) => widget.data)
.reduce((String value, String element) => value + element);
expect(foundText, equals(text));
}
void main() {
testWidgets('Viewport+SliverBlock 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),
], 'ab');
await test(tester, 200.0);
verify(tester, <Offset>[
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
], 'ab');
await test(tester, 600.0);
verify(tester, <Offset>[
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
], 'bc');
await test(tester, 900.0);
verify(tester, <Offset>[
const Offset(0.0, -100.0),
const Offset(0.0, 300.0),
], 'cd');
await test(tester, 200.0);
verify(tester, <Offset>[
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
], 'ab');
});
testWidgets('Viewport+SliverBlock basic test with constant SliverChildListDelegate', (WidgetTester tester) async {
await testWithConstChildDelegate(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),
], 'ab');
await testWithConstChildDelegate(tester, 200.0);
verify(tester, <Offset>[
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
], 'ab');
await testWithConstChildDelegate(tester, 600.0);
verify(tester, <Offset>[
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
], 'bc');
await testWithConstChildDelegate(tester, 900.0);
verify(tester, <Offset>[
const Offset(0.0, -100.0),
const Offset(0.0, 300.0),
], 'cd');
await testWithConstChildDelegate(tester, 200.0);
verify(tester, <Offset>[
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
], 'ab');
});
testWidgets('Viewport with GlobalKey reparenting', (WidgetTester tester) async {
final Key key1 = GlobalKey();
final ViewportOffset offset = ViewportOffset.zero();
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: offset,
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(<Widget>[
const SizedBox(height: 251.0, child: Text('a')),
const SizedBox(height: 252.0, child: Text('b')),
SizedBox(key: key1, height: 253.0, child: const Text('c')),
]),
),
],
),
),
);
verify(tester, <Offset>[
const Offset(0.0, 0.0),
const Offset(0.0, 251.0),
const Offset(0.0, 503.0),
], 'abc');
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: offset,
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(<Widget>[
SizedBox(key: key1, height: 253.0, child: const Text('c')),
const SizedBox(height: 251.0, child: Text('a')),
const SizedBox(height: 252.0, child: Text('b')),
]),
),
],
),
),
);
verify(tester, <Offset>[
const Offset(0.0, 0.0),
const Offset(0.0, 253.0),
const Offset(0.0, 504.0),
], 'cab');
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: offset,
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(<Widget>[
const SizedBox(height: 251.0, child: Text('a')),
SizedBox(key: key1, height: 253.0, child: const Text('c')),
const SizedBox(height: 252.0, child: Text('b')),
]),
),
],
),
),
);
verify(tester, <Offset>[
const Offset(0.0, 0.0),
const Offset(0.0, 251.0),
const Offset(0.0, 504.0),
], 'acb');
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: offset,
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(const <Widget>[
SizedBox(height: 251.0, child: Text('a')),
SizedBox(height: 252.0, child: Text('b')),
]),
),
],
),
),
);
verify(tester, <Offset>[
const Offset(0.0, 0.0),
const Offset(0.0, 251.0),
], 'ab');
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: offset,
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(<Widget>[
const SizedBox(height: 251.0, child: Text('a')),
SizedBox(key: key1, height: 253.0, child: const Text('c')),
const SizedBox(height: 252.0, child: Text('b')),
]),
),
],
),
),
);
verify(tester, <Offset>[
const Offset(0.0, 0.0),
const Offset(0.0, 251.0),
const Offset(0.0, 504.0),
], 'acb');
});
testWidgets('Viewport overflow clipping of SliverToBoxAdapter', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.zero(),
slivers: const <Widget>[
SliverToBoxAdapter(
child: SizedBox(height: 400.0, child: Text('a')),
),
],
),
),
);
expect(find.byType(Viewport), isNot(paints..clipRect()));
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.fixed(100.0),
slivers: const <Widget>[
SliverToBoxAdapter(
child: SizedBox(height: 400.0, child: Text('a')),
),
],
),
),
);
expect(find.byType(Viewport), paints..clipRect());
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.fixed(100.0),
slivers: const <Widget>[
SliverToBoxAdapter(
child: SizedBox(height: 4000.0, child: Text('a')),
),
],
),
),
);
expect(find.byType(Viewport), paints..clipRect());
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.zero(),
slivers: const <Widget>[
SliverToBoxAdapter(
child: SizedBox(height: 4000.0, child: Text('a')),
),
],
),
),
);
expect(find.byType(Viewport), paints..clipRect());
});
testWidgets('Viewport overflow clipping of SliverBlock', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.zero(),
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(const <Widget>[
SizedBox(height: 400.0, child: Text('a')),
]),
),
],
),
),
);
expect(find.byType(Viewport), isNot(paints..clipRect()));
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.fixed(100.0),
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(const <Widget>[
SizedBox(height: 400.0, child: Text('a')),
]),
),
],
),
),
);
expect(find.byType(Viewport), paints..clipRect());
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.fixed(100.0),
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(const <Widget>[
SizedBox(height: 4000.0, child: Text('a')),
]),
),
],
),
),
);
expect(find.byType(Viewport), paints..clipRect());
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
offset: ViewportOffset.zero(),
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(const <Widget>[
SizedBox(height: 4000.0, child: Text('a')),
]),
),
],
),
),
);
expect(find.byType(Viewport), paints..clipRect());
});
}