128 lines
3.7 KiB
Dart
128 lines
3.7 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('RenderAnimatedOpacityMixin does not drop layer when animating to 1', (WidgetTester tester) async {
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RenderTestObject.paintCount = 0;
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final AnimationController controller = AnimationController(vsync: const TestVSync(), duration: const Duration(seconds: 1));
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addTearDown(controller.dispose);
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final Tween<double> opacityTween = Tween<double>(begin: 0, end: 1);
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await tester.pumpWidget(
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ColoredBox(
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color: Colors.red,
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child: FadeTransition(
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opacity: controller.drive(opacityTween),
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child: const TestWidget(),
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),
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)
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);
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expect(RenderTestObject.paintCount, 0);
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controller.forward();
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await tester.pump();
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await tester.pump(const Duration(milliseconds: 500));
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expect(RenderTestObject.paintCount, 1);
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await tester.pump();
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await tester.pump(const Duration(milliseconds: 500));
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expect(RenderTestObject.paintCount, 1);
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controller.stop();
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await tester.pump();
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expect(RenderTestObject.paintCount, 1);
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});
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testWidgets('RenderAnimatedOpacityMixin avoids repainting child as it animates', (WidgetTester tester) async {
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RenderTestObject.paintCount = 0;
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final AnimationController controller = AnimationController(vsync: const TestVSync(), duration: const Duration(seconds: 1));
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addTearDown(controller.dispose);
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final Tween<double> opacityTween = Tween<double>(begin: 0, end: 0.99); // Layer is dropped at 1
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await tester.pumpWidget(
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ColoredBox(
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color: Colors.red,
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child: FadeTransition(
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opacity: controller.drive(opacityTween),
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child: const TestWidget(),
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),
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)
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);
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expect(RenderTestObject.paintCount, 0);
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controller.forward();
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await tester.pump();
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await tester.pump(const Duration(milliseconds: 500));
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expect(RenderTestObject.paintCount, 1);
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await tester.pump();
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await tester.pump(const Duration(milliseconds: 500));
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expect(RenderTestObject.paintCount, 1);
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controller.stop();
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await tester.pump();
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expect(RenderTestObject.paintCount, 1);
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});
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testWidgets('RenderAnimatedOpacityMixin allows opacity layer to be disposed when animating to 0 opacity', (WidgetTester tester) async {
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RenderTestObject.paintCount = 0;
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final AnimationController controller = AnimationController(vsync: const TestVSync(), duration: const Duration(seconds: 1));
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addTearDown(controller.dispose);
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final Tween<double> opacityTween = Tween<double>(begin: 0.99, end: 0);
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await tester.pumpWidget(
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ColoredBox(
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color: Colors.red,
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child: FadeTransition(
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opacity: controller.drive(opacityTween),
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child: const TestWidget(),
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),
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)
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);
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expect(RenderTestObject.paintCount, 1);
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expect(tester.layers, contains(isA<OpacityLayer>()));
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controller.forward();
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await tester.pump();
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await tester.pump(const Duration(seconds: 2));
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expect(RenderTestObject.paintCount, 1);
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controller.stop();
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await tester.pump();
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expect(tester.layers, isNot(contains(isA<OpacityLayer>())));
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});
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}
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class TestWidget extends SingleChildRenderObjectWidget {
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const TestWidget({super.key, super.child});
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@override
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RenderObject createRenderObject(BuildContext context) {
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return RenderTestObject();
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}
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}
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class RenderTestObject extends RenderProxyBox {
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static int paintCount = 0;
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@override
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void paint(PaintingContext context, Offset offset) {
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paintCount += 1;
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super.paint(context, offset);
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}
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}
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