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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/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
import 'rendering_tester.dart';
void main() {
TestRenderingFlutterBinding.ensureInitialized();
test('RenderSliverOpacity does not composite if it is transparent', () {
final RenderSliverOpacity renderSliverOpacity = RenderSliverOpacity(
opacity: 0.0,
sliver: RenderSliverToBoxAdapter(
child: RenderSizedBox(const Size(1.0, 1.0)), // size doesn't matter
),
);
final RenderViewport root = RenderViewport(
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
cacheExtent: 250.0,
children: <RenderSliver>[renderSliverOpacity],
);
layout(root, phase: EnginePhase.composite);
expect(renderSliverOpacity.needsCompositing, false);
});
test('RenderSliverOpacity does composite if it is opaque', () {
final RenderSliverOpacity renderSliverOpacity = RenderSliverOpacity(
sliver: RenderSliverToBoxAdapter(
child: RenderSizedBox(const Size(1.0, 1.0)), // size doesn't matter
),
);
final RenderViewport root = RenderViewport(
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
cacheExtent: 250.0,
children: <RenderSliver>[renderSliverOpacity],
);
layout(root, phase: EnginePhase.composite);
expect(renderSliverOpacity.needsCompositing, true);
});
test('RenderSliverOpacity reuses its layer', () {
final RenderSliverOpacity renderSliverOpacity = RenderSliverOpacity(
opacity: 0.5,
sliver: RenderSliverToBoxAdapter(
child: RenderSizedBox(const Size(1.0, 1.0)), // size doesn't matter
),
);
final RenderViewport root = RenderViewport(
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
cacheExtent: 250.0,
children: <RenderSliver>[renderSliverOpacity],
);
expect(renderSliverOpacity.debugLayer, null);
layout(root, phase: EnginePhase.paint, constraints: BoxConstraints.tight(const Size(10, 10)));
final ContainerLayer layer = renderSliverOpacity.debugLayer!;
expect(layer, isNotNull);
// Mark for repaint otherwise pumpFrame is a noop.
renderSliverOpacity.markNeedsPaint();
expect(renderSliverOpacity.debugNeedsPaint, true);
pumpFrame(phase: EnginePhase.paint);
expect(renderSliverOpacity.debugNeedsPaint, false);
expect(renderSliverOpacity.debugLayer, same(layer));
});
test('RenderSliverAnimatedOpacity does not composite if it is transparent', () async {
final Animation<double> opacityAnimation = AnimationController(
vsync: FakeTickerProvider(),
)..value = 0.0;
final RenderSliverAnimatedOpacity renderSliverAnimatedOpacity = RenderSliverAnimatedOpacity(
opacity: opacityAnimation,
sliver: RenderSliverToBoxAdapter(
child: RenderSizedBox(const Size(1.0, 1.0)), // size doesn't matter
),
);
final RenderViewport root = RenderViewport(
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
cacheExtent: 250.0,
children: <RenderSliver>[renderSliverAnimatedOpacity],
);
layout(root, phase: EnginePhase.composite);
expect(renderSliverAnimatedOpacity.needsCompositing, false);
});
test('RenderSliverAnimatedOpacity does composite if it is partially opaque', () {
final Animation<double> opacityAnimation = AnimationController(
vsync: FakeTickerProvider(),
)..value = 0.5;
final RenderSliverAnimatedOpacity renderSliverAnimatedOpacity = RenderSliverAnimatedOpacity(
opacity: opacityAnimation,
sliver: RenderSliverToBoxAdapter(
child: RenderSizedBox(const Size(1.0, 1.0)), // size doesn't matter
),
);
final RenderViewport root = RenderViewport(
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
cacheExtent: 250.0,
children: <RenderSliver>[renderSliverAnimatedOpacity],
);
layout(root, phase: EnginePhase.composite);
expect(renderSliverAnimatedOpacity.needsCompositing, true);
});
test('RenderSliverAnimatedOpacity does composite if it is opaque', () {
final Animation<double> opacityAnimation = AnimationController(
vsync: FakeTickerProvider(),
)..value = 1.0;
final RenderSliverAnimatedOpacity renderSliverAnimatedOpacity = RenderSliverAnimatedOpacity(
opacity: opacityAnimation,
sliver: RenderSliverToBoxAdapter(
child: RenderSizedBox(const Size(1.0, 1.0)), // size doesn't matter
),
);
final RenderViewport root = RenderViewport(
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
cacheExtent: 250.0,
children: <RenderSliver>[renderSliverAnimatedOpacity],
);
layout(root, phase: EnginePhase.composite);
expect(renderSliverAnimatedOpacity.needsCompositing, true);
});
test('RenderSliverAnimatedOpacity reuses its layer', () {
final Animation<double> opacityAnimation = AnimationController(
vsync: FakeTickerProvider(),
)..value = 0.5; // must not be 0 or 1.0. Otherwise, it won't create a layer
final RenderSliverAnimatedOpacity renderSliverAnimatedOpacity = RenderSliverAnimatedOpacity(
opacity: opacityAnimation,
sliver: RenderSliverToBoxAdapter(
child: RenderSizedBox(const Size(1.0, 1.0)), // size doesn't matter
),
);
final RenderViewport root = RenderViewport(
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
cacheExtent: 250.0,
children: <RenderSliver>[renderSliverAnimatedOpacity],
);
expect(renderSliverAnimatedOpacity.debugLayer, null);
layout(root, phase: EnginePhase.paint, constraints: BoxConstraints.tight(const Size(10, 10)));
final ContainerLayer layer = renderSliverAnimatedOpacity.debugLayer!;
expect(layer, isNotNull);
// Mark for repaint otherwise pumpFrame is a noop.
renderSliverAnimatedOpacity.markNeedsPaint();
expect(renderSliverAnimatedOpacity.debugNeedsPaint, true);
pumpFrame(phase: EnginePhase.paint);
expect(renderSliverAnimatedOpacity.debugNeedsPaint, false);
expect(renderSliverAnimatedOpacity.debugLayer, same(layer));
});
}