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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/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
test('applyGrowthDirectionToAxisDirection produces expected AxisDirection', () {
expect(AxisDirection.values.length, 4);
for (final AxisDirection axisDirection in AxisDirection.values) {
expect(applyGrowthDirectionToAxisDirection(axisDirection, GrowthDirection.forward), axisDirection);
}
expect(applyGrowthDirectionToAxisDirection(AxisDirection.up, GrowthDirection.reverse), AxisDirection.down);
expect(applyGrowthDirectionToAxisDirection(AxisDirection.down, GrowthDirection.reverse), AxisDirection.up);
expect(applyGrowthDirectionToAxisDirection(AxisDirection.left, GrowthDirection.reverse), AxisDirection.right);
expect(applyGrowthDirectionToAxisDirection(AxisDirection.right, GrowthDirection.reverse), AxisDirection.left);
});
test('SliverConstraints are the same when copied', () {
const SliverConstraints original = SliverConstraints(
axisDirection: AxisDirection.down,
growthDirection: GrowthDirection.forward,
userScrollDirection: ScrollDirection.idle,
scrollOffset: 0.0,
precedingScrollExtent: 0.0,
overlap: 0.0,
remainingPaintExtent: 0.0,
crossAxisExtent: 0.0,
crossAxisDirection: AxisDirection.right,
viewportMainAxisExtent: 0.0,
cacheOrigin: 0.0,
remainingCacheExtent: 0.0,
);
final SliverConstraints copy = original.copyWith();
expect(original, equals(copy));
expect(original.hashCode, equals(copy.hashCode));
expect(original.toString(), equals(copy.toString()));
expect(original, hasOneLineDescription);
expect(original.normalizedGrowthDirection, equals(GrowthDirection.forward));
});
test('SliverConstraints normalizedGrowthDirection is inferred from AxisDirection and GrowthDirection', () {
const SliverConstraints a = SliverConstraints(
axisDirection: AxisDirection.down,
growthDirection: GrowthDirection.forward,
userScrollDirection: ScrollDirection.idle,
scrollOffset: 0.0,
precedingScrollExtent: 0.0,
overlap: 0.0,
remainingPaintExtent: 0.0,
crossAxisExtent: 0.0,
crossAxisDirection: AxisDirection.right,
viewportMainAxisExtent: 0.0,
cacheOrigin: 0.0,
remainingCacheExtent: 0.0,
);
final SliverConstraints c = a.copyWith(
axisDirection: AxisDirection.up,
growthDirection: GrowthDirection.reverse,
userScrollDirection: ScrollDirection.forward,
scrollOffset: 10.0,
overlap: 20.0,
remainingPaintExtent: 30.0,
crossAxisExtent: 40.0,
viewportMainAxisExtent: 30.0,
);
const SliverConstraints d = SliverConstraints(
axisDirection: AxisDirection.up,
growthDirection: GrowthDirection.reverse,
userScrollDirection: ScrollDirection.forward,
scrollOffset: 10.0,
precedingScrollExtent: 0.0,
overlap: 20.0,
remainingPaintExtent: 30.0,
crossAxisExtent: 40.0,
crossAxisDirection: AxisDirection.right,
viewportMainAxisExtent: 30.0,
cacheOrigin: 0.0,
remainingCacheExtent: 0.0,
);
expect(c, equals(d));
expect(c.normalizedGrowthDirection, equals(GrowthDirection.forward));
expect(d.normalizedGrowthDirection, equals(GrowthDirection.forward));
final SliverConstraints e = d.copyWith(axisDirection: AxisDirection.right);
expect(e.normalizedGrowthDirection, equals(GrowthDirection.reverse));
final SliverConstraints f = d.copyWith(axisDirection: AxisDirection.left);
expect(f.normalizedGrowthDirection, equals(GrowthDirection.forward));
final SliverConstraints g = d.copyWith(growthDirection: GrowthDirection.forward);
expect(g.normalizedGrowthDirection, equals(GrowthDirection.reverse));
});
test('SliverGeometry with no arguments is valid', () {
expect(const SliverGeometry().debugAssertIsValid(), isTrue);
});
test('SliverGeometry throws error when layoutExtent exceeds paintExtent', () {
expect(() {
const SliverGeometry(layoutExtent: 10.0, paintExtent: 9.0).debugAssertIsValid();
}, throwsFlutterError);
});
test('SliverGeometry throws error when maxPaintExtent is less than paintExtent', () {
expect(() {
const SliverGeometry(paintExtent: 9.0, maxPaintExtent: 8.0).debugAssertIsValid();
}, throwsFlutterError);
});
}