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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.
// This file is separate from viewport_test.dart because we can't use both
// testWidgets and rendering_tester in the same file - testWidgets will
// initialize a binding, which rendering_tester will attempt to re-initialize
// (or vice versa).
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'rendering_tester.dart';
void main() {
const double width = 800;
const double height = 600;
Rect rectExpandedOnAxis(double value) => Rect.fromLTRB(0.0, 0.0 - value, width, height + value);
List<RenderSliver> children;
setUp(() {
children = <RenderSliver>[
RenderSliverToBoxAdapter(
child: RenderSizedBox(const Size(800, 400)),
),
];
});
test('Cache extent - null, pixels', () async {
final RenderViewport renderViewport = RenderViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
children: children,
);
layout(renderViewport, phase: EnginePhase.flushSemantics);
expect(
renderViewport.describeSemanticsClip(null),
rectExpandedOnAxis(RenderAbstractViewport.defaultCacheExtent),
);
});
test('Cache extent - 0, pixels', () async {
final RenderViewport renderViewport = RenderViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
cacheExtent: 0.0,
children: children,
);
layout(renderViewport, phase: EnginePhase.flushSemantics);
expect(renderViewport.describeSemanticsClip(null), rectExpandedOnAxis(0.0));
});
test('Cache extent - 500, pixels', () async {
final RenderViewport renderViewport = RenderViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
cacheExtent: 500.0,
children: children,
);
layout(renderViewport, phase: EnginePhase.flushSemantics);
expect(renderViewport.describeSemanticsClip(null), rectExpandedOnAxis(500.0));
});
test('Cache extent - nullx viewport', () async {
await expectLater(() => RenderViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
cacheExtent: null,
cacheExtentStyle: CacheExtentStyle.viewport,
children: children,
),
throwsAssertionError
);
});
test('Cache extent - 0x viewport', () async {
final RenderViewport renderViewport = RenderViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
cacheExtent: 0.0,
cacheExtentStyle: CacheExtentStyle.viewport,
children: children,
);
layout(renderViewport);
expect(renderViewport.describeSemanticsClip(null), rectExpandedOnAxis(0));
});
test('Cache extent - .5x viewport', () async {
final RenderViewport renderViewport = RenderViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
cacheExtent: .5,
cacheExtentStyle: CacheExtentStyle.viewport,
children: children,
);
layout(renderViewport);
expect(renderViewport.describeSemanticsClip(null), rectExpandedOnAxis(height / 2));
});
test('Cache extent - 1x viewport', () async {
final RenderViewport renderViewport = RenderViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
cacheExtent: 1.0,
cacheExtentStyle: CacheExtentStyle.viewport,
children: children,
);
layout(renderViewport);
expect(renderViewport.describeSemanticsClip(null), rectExpandedOnAxis(height));
});
test('Cache extent - 2.5x viewport', () async {
final RenderViewport renderViewport = RenderViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
cacheExtent: 2.5,
cacheExtentStyle: CacheExtentStyle.viewport,
children: children,
);
layout(renderViewport);
expect(renderViewport.describeSemanticsClip(null), rectExpandedOnAxis(height * 2.5));
});
test('RenderShrinkWrappingViewport describeApproximatePaintClip with infinite viewportMainAxisExtent returns finite rect', () {
final RenderSliver child = CustomConstraintsRenderSliver(const SliverConstraints(
axisDirection: AxisDirection.down,
cacheOrigin: 0.0,
crossAxisDirection: AxisDirection.left,
crossAxisExtent: 400.0,
growthDirection: GrowthDirection.forward,
overlap: 1.0, // must not equal 0 for this test
precedingScrollExtent: 0.0,
remainingPaintExtent: double.infinity,
remainingCacheExtent: 0.0,
scrollOffset: 0.0,
userScrollDirection: ScrollDirection.idle,
viewportMainAxisExtent: double.infinity, // must == infinity
));
final RenderShrinkWrappingViewport viewport = RenderShrinkWrappingViewport(
crossAxisDirection: AxisDirection.left,
offset: ViewportOffset.zero(),
children: <RenderSliver>[ child ],
);
layout(viewport);
expect(
viewport.describeApproximatePaintClip(child),
const Rect.fromLTRB(0.0, 0.0, 800.0, 600.0),
);
});
}
class CustomConstraintsRenderSliver extends RenderSliver {
CustomConstraintsRenderSliver(this.constraints);
@override
SliverGeometry get geometry => const SliverGeometry();
@override
final SliverConstraints constraints;
@override
void performLayout() {}
}