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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';
const Key blockKey = Key('test');
void main() {
testWidgets('Cannot scroll a non-overflowing block', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: ListView(
key: blockKey,
children: <Widget>[
Container(
height: 200.0, // less than 600, the height of the test area
child: const Text('Hello'),
),
],
),
),
);
final Offset middleOfContainer = tester.getCenter(find.text('Hello'));
final Offset target = tester.getCenter(find.byKey(blockKey));
final TestGesture gesture = await tester.startGesture(target);
await gesture.moveBy(const Offset(0.0, -10.0));
await tester.pump(const Duration(milliseconds: 1));
expect(tester.getCenter(find.text('Hello')) == middleOfContainer, isTrue);
await gesture.up();
});
testWidgets('Can scroll an overflowing block', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: ListView(
key: blockKey,
children: <Widget>[
Container(
height: 2000.0, // more than 600, the height of the test area
child: const Text('Hello'),
),
],
),
),
);
final Offset middleOfContainer = tester.getCenter(find.text('Hello'));
expect(middleOfContainer.dx, equals(400.0));
expect(middleOfContainer.dy, equals(1000.0));
final Offset target = tester.getCenter(find.byKey(blockKey));
final TestGesture gesture = await tester.startGesture(target);
await gesture.moveBy(const Offset(0.0, -10.0));
await tester.pump(); // redo layout
expect(tester.getCenter(find.text('Hello')), isNot(equals(middleOfContainer)));
await gesture.up();
});
testWidgets('ListView reverse', (WidgetTester tester) async {
int first = 0;
int second = 0;
Widget buildBlock({ bool reverse = false }) {
return Directionality(
textDirection: TextDirection.ltr,
child: ListView(
key: UniqueKey(),
reverse: reverse,
children: <Widget>[
GestureDetector(
onTap: () { first += 1; },
child: Container(
height: 350.0, // more than half the height of the test area
color: const Color(0xFF00FF00),
),
),
GestureDetector(
onTap: () { second += 1; },
child: Container(
height: 350.0, // more than half the height of the test area
color: const Color(0xFF0000FF),
),
),
],
),
);
}
await tester.pumpWidget(buildBlock(reverse: true));
const Offset target = Offset(200.0, 200.0);
await tester.tapAt(target);
expect(first, equals(0));
expect(second, equals(1));
await tester.pumpWidget(buildBlock(reverse: false));
await tester.tapAt(target);
expect(first, equals(1));
expect(second, equals(1));
});
testWidgets('ListView controller', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
Widget buildBlock() {
return Directionality(
textDirection: TextDirection.ltr,
child: ListView(
controller: controller,
children: const <Widget>[Text('A'), Text('B'), Text('C')],
),
);
}
await tester.pumpWidget(buildBlock());
expect(controller.offset, equals(0.0));
});
testWidgets('SliverBlockChildListDelegate.estimateMaxScrollOffset hits end', (WidgetTester tester) async {
final SliverChildListDelegate delegate = SliverChildListDelegate(<Widget>[
Container(),
Container(),
Container(),
Container(),
Container(),
]);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
slivers: <Widget>[
SliverList(
delegate: delegate,
),
],
),
),
);
final SliverMultiBoxAdaptorElement element = tester.element(find.byType(SliverList, skipOffstage: false));
final double maxScrollOffset = element.estimateMaxScrollOffset(
null,
firstIndex: 3,
lastIndex: 4,
leadingScrollOffset: 25.0,
trailingScrollOffset: 26.0,
);
expect(maxScrollOffset, equals(26.0));
});
testWidgets('Resizing a ListView child restores scroll offset', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/9221
final AnimationController controller = AnimationController(
vsync: const TestVSync(),
duration: const Duration(milliseconds: 200),
);
// The overall height of the frame is (as ever) 600
Widget buildFrame() {
return Directionality(
textDirection: TextDirection.ltr,
child: Column(
children: <Widget>[
Flexible(
// The overall height of the ListView's contents is 500
child: ListView(
children: const <Widget>[
SizedBox(
height: 150.0,
child: Center(
child: Text('top'),
),
),
SizedBox(
height: 200.0,
child: Center(
child: Text('middle'),
),
),
SizedBox(
height: 150.0,
child: Center(
child: Text('bottom'),
),
),
],
),
),
// If this widget's height is > 100 the ListView can scroll.
SizeTransition(
sizeFactor: controller.view,
child: const SizedBox(
height: 300.0,
child: Text('keyboard'),
),
),
],
),
);
}
await tester.pumpWidget(buildFrame());
expect(find.text('top'), findsOneWidget);
final ScrollPosition position = Scrollable.of(tester.element(find.text('middle'))).position;
expect(position.viewportDimension, 600.0);
expect(position.pixels, 0.0);
// Animate the 'keyboard' height from 0 to 300
controller.forward();
await tester.pumpAndSettle();
expect(position.viewportDimension, 300.0);
// Scroll the ListView upwards
position.jumpTo(200.0);
await tester.pumpAndSettle();
expect(position.pixels, 200.0);
expect(find.text('top'), findsNothing);
// Animate the 'keyboard' height back to 0. This causes the scroll
// offset to return to 0.0
controller.reverse();
await tester.pumpAndSettle();
expect(position.viewportDimension, 600.0);
expect(position.pixels, 0.0);
expect(find.text('top'), findsOneWidget);
});
}