blob: c285075c5a57b556db32061ed6de97f692668a64 [file] [log] [blame]
// 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/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('RenderOpacity avoids repainting and does not drop layer at fully opaque', (WidgetTester tester) async {
RenderTestObject.paintCount = 0;
await tester.pumpWidget(
Container(
color: Colors.red,
child: const Opacity(
opacity: 0.0,
child: TestWidget(),
),
)
);
expect(RenderTestObject.paintCount, 0);
await tester.pumpWidget(
Container(
color: Colors.red,
child: const Opacity(
opacity: 0.1,
child: TestWidget(),
),
)
);
expect(RenderTestObject.paintCount, 1);
await tester.pumpWidget(
Container(
color: Colors.red,
child: const Opacity(
opacity: 1,
child: TestWidget(),
),
)
);
expect(RenderTestObject.paintCount, 1);
});
testWidgets('RenderOpacity allows opacity layer to be dropped at 0 opacity', (WidgetTester tester) async {
RenderTestObject.paintCount = 0;
await tester.pumpWidget(
Container(
color: Colors.red,
child: const Opacity(
opacity: 0.5,
child: TestWidget(),
),
)
);
expect(RenderTestObject.paintCount, 1);
await tester.pumpWidget(
Container(
color: Colors.red,
child: const Opacity(
opacity: 0.0,
child: TestWidget(),
),
)
);
expect(RenderTestObject.paintCount, 1);
expect(tester.layers, isNot(contains(isA<OpacityLayer>())));
});
}
class TestWidget extends SingleChildRenderObjectWidget {
const TestWidget({super.key, super.child});
@override
RenderObject createRenderObject(BuildContext context) {
return RenderTestObject();
}
}
class RenderTestObject extends RenderProxyBox {
static int paintCount = 0;
@override
void paint(PaintingContext context, Offset offset) {
paintCount += 1;
super.paint(context, offset);
}
}