physics_test.dart
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import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:sheet/sheet.dart';
import '../helpers.dart';
import '../screen_size_test.dart';
void main() {
group('SheetPhysics', () {
group('NeverDraggableSheetPhysics', () {
testWidgets('does not scroll', (WidgetTester tester) async {
await tester.pumpApp(
Sheet(
physics: const NeverDraggableSheetPhysics(parent: null),
initialExtent: kScreenSize.height,
fit: SheetFit.expand,
child: Container(
color: Colors.red,
),
),
);
await tester.pumpAndSettle();
expect(tester.getRect(find.byType(Container)), kScreenRect);
await tester.drag(find.byType(Container), const Offset(0, 100));
expect(tester.getRect(find.byType(Container)), kScreenRect);
});
test('should not reload', () async {
expect(
const NeverDraggableSheetPhysics()
.shouldReload(const NeverDraggableSheetPhysics()),
isFalse,
);
});
});
group('AlwaysDraggableSheetPhysics', () {
testWidgets('scrolls', (WidgetTester tester) async {
await tester.pumpApp(
Sheet(
physics: const AlwaysDraggableSheetPhysics(),
initialExtent: kScreenSize.height,
fit: SheetFit.expand,
child: Container(
color: Colors.red,
),
),
);
await tester.pumpAndSettle();
expect(tester.getRect(find.byType(Container)), kScreenRect);
await tester.drag(find.byType(Container), const Offset(0, 100));
expect(tester.getRect(find.byType(Container)),
kScreenRect.translate(0, 100));
});
});
group('BouncingSheetPhysics', () {
late BouncingSheetPhysics physicsUnderTest;
setUp(() {
physicsUnderTest = const BouncingSheetPhysics();
});
test('should not reload by default', () {
expect(
physicsUnderTest.shouldReload(const BouncingSheetPhysics()),
isFalse,
);
});
test('should reload if params is different', () {
expect(
physicsUnderTest.shouldReload(
const BouncingSheetPhysics(overflowViewport: true),
),
isTrue,
);
});
test('overscroll is progressively harder', () {
final ScrollMetrics lessOverscrolledPosition = FixedScrollMetrics(
devicePixelRatio: 1,
minScrollExtent: 0.0,
maxScrollExtent: 1000.0,
pixels: -20.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
final ScrollMetrics moreOverscrolledPosition = FixedScrollMetrics(
minScrollExtent: 0.0,
devicePixelRatio: 1,
maxScrollExtent: 1000.0,
pixels: -40.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
final double lessOverscrollApplied = physicsUnderTest
.applyPhysicsToUserOffset(lessOverscrolledPosition, 10.0);
final double moreOverscrollApplied = physicsUnderTest
.applyPhysicsToUserOffset(moreOverscrolledPosition, 10.0);
expect(lessOverscrollApplied, greaterThan(0.1));
expect(lessOverscrollApplied, lessThan(20.0));
expect(moreOverscrollApplied, greaterThan(0.1));
expect(moreOverscrollApplied, lessThan(20.0));
// Scrolling from a more overscrolled position meets more resistance.
expect(
lessOverscrollApplied.abs(),
greaterThan(moreOverscrollApplied.abs()),
);
});
test('easing an overscroll still has resistance', () {
final ScrollMetrics overscrolledPosition = FixedScrollMetrics(
minScrollExtent: 0.0,
devicePixelRatio: 1,
maxScrollExtent: 1000.0,
pixels: -20.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
final double easingApplied = physicsUnderTest.applyPhysicsToUserOffset(
overscrolledPosition, -10.0);
expect(easingApplied, lessThan(-0.1));
expect(easingApplied, greaterThan(-10.0));
});
test('no resistance when not overscrolled', () {
final ScrollMetrics scrollPosition = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 1000.0,
devicePixelRatio: 1,
pixels: 300.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
expect(
physicsUnderTest.applyPhysicsToUserOffset(scrollPosition, 10.0),
10.0,
);
expect(
physicsUnderTest.applyPhysicsToUserOffset(scrollPosition, -10.0),
-10.0,
);
});
test('easing an overscroll meets less resistance than tensioning', () {
final ScrollMetrics overscrolledPosition = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 1000.0,
devicePixelRatio: 1,
pixels: -20.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
final double easingApplied = physicsUnderTest.applyPhysicsToUserOffset(
overscrolledPosition, -10.0);
final double tensioningApplied = physicsUnderTest
.applyPhysicsToUserOffset(overscrolledPosition, 10.0);
expect(easingApplied.abs(), greaterThan(tensioningApplied.abs()));
});
test('overscroll a small extent and a big extent works the same way', () {
final ScrollMetrics smallListOverscrolledPosition = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 10.0,
pixels: -20.0,
devicePixelRatio: 1,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
final ScrollMetrics bigListOverscrolledPosition = FixedScrollMetrics(
minScrollExtent: 0.0,
devicePixelRatio: 1,
maxScrollExtent: 1000.0,
pixels: -20.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
final double smallListOverscrollApplied = physicsUnderTest
.applyPhysicsToUserOffset(smallListOverscrolledPosition, 10.0);
final double bigListOverscrollApplied = physicsUnderTest
.applyPhysicsToUserOffset(bigListOverscrolledPosition, 10.0);
expect(smallListOverscrollApplied, equals(bigListOverscrollApplied));
expect(smallListOverscrollApplied, greaterThan(0.3));
expect(smallListOverscrollApplied, lessThan(20.0));
});
group('applyBoundaryConditions', () {
test(
'throws when proposed pixels '
'are the same as the current ones', () {
final ScrollMetrics scrollMetrics = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 200.0,
devicePixelRatio: 1,
pixels: 10.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
expect(
() => physicsUnderTest.applyBoundaryConditions(scrollMetrics, 10.0),
throwsAssertionError,
);
});
group('when overflowViewport', () {
test('does not appyBoundaryConditions top edge', () {
const BouncingSheetPhysics physicsUnderTest =
BouncingSheetPhysics(overflowViewport: true);
final ScrollMetrics scrollMetrics = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 200.0,
devicePixelRatio: 1,
pixels: 120.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, 121.0),
isZero,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, 119.0),
isZero,
);
});
test('does appyBoundaryConditions bottom edge', () {
const BouncingSheetPhysics physicsUnderTest =
BouncingSheetPhysics(overflowViewport: true);
final ScrollMetrics scrollMetrics = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 200.0,
devicePixelRatio: 1,
pixels: -10.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, -11.0),
-1,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, -9.0),
0,
);
});
});
});
group('when no overflowViewport appyBoundaryConditions', () {
test('top edge', () {
final ScrollMetrics scrollMetrics = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 200.0,
devicePixelRatio: 1,
pixels: 120.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, 121.0),
1,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, 119.0),
isZero,
);
});
test('bottom edge', () {
final ScrollMetrics scrollMetrics = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 200.0,
devicePixelRatio: 1,
pixels: -10.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, -11.0),
-1,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, -9.0),
0,
);
});
});
});
group('NoMomentumSheetPhysics', () {
late NoMomentumSheetPhysics physicsUnderTest;
setUp(() {
physicsUnderTest = const NoMomentumSheetPhysics();
});
group('clamps with applyBoundaryConditions', () {
test('top edge', () {
final ScrollMetrics scrollMetrics = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 200.0,
devicePixelRatio: 1,
pixels: 120.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, 201.0),
1,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, 199.0),
isZero,
);
});
test('bottom edge', () {
final ScrollMetrics scrollMetrics = FixedScrollMetrics(
minScrollExtent: 0.0,
maxScrollExtent: 200.0,
devicePixelRatio: 1,
pixels: -10.0,
viewportDimension: 100.0,
axisDirection: AxisDirection.down,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, -11.0),
-1,
);
expect(
physicsUnderTest.applyBoundaryConditions(scrollMetrics, -9.0),
0,
);
});
});
});
testWidgets('SnapSheetPhysics', (WidgetTester tester) async {
await tester.pumpApp(
Sheet(
physics: const SnapSheetPhysics(stops: <double>[0, 1]),
initialExtent: kScreenSize.height,
fit: SheetFit.expand,
child: Container(
color: Colors.red,
),
),
);
await tester.pumpAndSettle();
expect(tester.getSheetTop(), isZero);
expect(tester.getSheetHeight(), kScreenSize.height);
await tester.dragSheet(300);
await tester.pumpAndSettle();
expect(tester.getSheetTop(), kScreenSize.height);
});
});
}