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dual_transition_builder_test.dart
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dual_transition_builder_test.dart
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// Copyright 2013 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_test/flutter_test.dart';
void main() {
testWidgets('runs animations', (WidgetTester tester) async {
final AnimationController controller = AnimationController(
vsync: const TestVSync(),
duration: const Duration(milliseconds: 300),
);
await tester.pumpWidget(Center(
child: DualTransitionBuilder(
animation: controller,
forwardBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return ScaleTransition(
scale: animation,
child: child,
);
},
reverseBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return FadeTransition(
opacity: Tween<double>(begin: 1.0, end: 0.0).animate(animation),
child: child,
);
},
child: Container(
color: Colors.green,
height: 100,
width: 100,
),
),
));
expect(_getScale(tester), 0.0);
expect(_getOpacity(tester), 1.0);
controller.forward();
await tester.pump();
await tester.pump(const Duration(milliseconds: 150));
expect(_getScale(tester), 0.5);
expect(_getOpacity(tester), 1.0);
await tester.pump(const Duration(milliseconds: 150));
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 1.0);
await tester.pumpAndSettle();
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 1.0);
controller.reverse();
await tester.pump();
await tester.pump(const Duration(milliseconds: 150));
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 0.5);
await tester.pump(const Duration(milliseconds: 150));
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 0.0);
await tester.pumpAndSettle();
expect(_getScale(tester), 0.0);
expect(_getOpacity(tester), 1.0);
});
testWidgets('keeps state', (WidgetTester tester) async {
final AnimationController controller = AnimationController(
vsync: const TestVSync(),
duration: const Duration(milliseconds: 300),
);
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: Center(
child: DualTransitionBuilder(
animation: controller,
forwardBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return ScaleTransition(
scale: animation,
child: child,
);
},
reverseBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return FadeTransition(
opacity: Tween<double>(begin: 1.0, end: 0.0).animate(animation),
child: child,
);
},
child: const _StatefulTestWidget(name: 'Foo'),
),
),
));
final State<StatefulWidget> state =
tester.state(find.byType(_StatefulTestWidget));
expect(state, isNotNull);
controller.forward();
await tester.pump();
expect(state, same(tester.state(find.byType(_StatefulTestWidget))));
await tester.pump(const Duration(milliseconds: 150));
expect(state, same(tester.state(find.byType(_StatefulTestWidget))));
await tester.pump(const Duration(milliseconds: 150));
expect(state, same(tester.state(find.byType(_StatefulTestWidget))));
await tester.pumpAndSettle();
expect(state, same(tester.state(find.byType(_StatefulTestWidget))));
controller.reverse();
await tester.pump();
expect(state, same(tester.state(find.byType(_StatefulTestWidget))));
await tester.pump(const Duration(milliseconds: 150));
expect(state, same(tester.state(find.byType(_StatefulTestWidget))));
await tester.pump(const Duration(milliseconds: 150));
expect(state, same(tester.state(find.byType(_StatefulTestWidget))));
await tester.pumpAndSettle();
expect(state, same(tester.state(find.byType(_StatefulTestWidget))));
});
testWidgets('does not jump when interrupted - forward',
(WidgetTester tester) async {
final AnimationController controller = AnimationController(
vsync: const TestVSync(),
duration: const Duration(milliseconds: 300),
);
await tester.pumpWidget(Center(
child: DualTransitionBuilder(
animation: controller,
forwardBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return ScaleTransition(
scale: animation,
child: child,
);
},
reverseBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return FadeTransition(
opacity: Tween<double>(begin: 1.0, end: 0.0).animate(animation),
child: child,
);
},
child: Container(
color: Colors.green,
height: 100,
width: 100,
),
),
));
expect(_getScale(tester), 0.0);
expect(_getOpacity(tester), 1.0);
controller.forward();
await tester.pump();
await tester.pump(const Duration(milliseconds: 150));
expect(_getScale(tester), 0.5);
expect(_getOpacity(tester), 1.0);
controller.reverse();
expect(_getScale(tester), 0.5);
expect(_getOpacity(tester), 1.0);
await tester.pump();
expect(_getScale(tester), 0.5);
expect(_getOpacity(tester), 1.0);
await tester.pump(const Duration(milliseconds: 75));
expect(_getScale(tester), 0.25);
expect(_getOpacity(tester), 1.0);
await tester.pump(const Duration(milliseconds: 75));
expect(_getScale(tester), 0.0);
expect(_getOpacity(tester), 1.0);
await tester.pumpAndSettle();
expect(_getScale(tester), 0.0);
expect(_getOpacity(tester), 1.0);
});
testWidgets('does not jump when interrupted - reverse',
(WidgetTester tester) async {
final AnimationController controller = AnimationController(
value: 1.0,
vsync: const TestVSync(),
duration: const Duration(milliseconds: 300),
);
await tester.pumpWidget(Center(
child: DualTransitionBuilder(
animation: controller,
forwardBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return ScaleTransition(
scale: animation,
child: child,
);
},
reverseBuilder: (
BuildContext context,
Animation<double> animation,
Widget? child,
) {
return FadeTransition(
opacity: Tween<double>(begin: 1.0, end: 0.0).animate(animation),
child: child,
);
},
child: Container(
color: Colors.green,
height: 100,
width: 100,
),
),
));
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 1.0);
controller.reverse();
await tester.pump();
await tester.pump(const Duration(milliseconds: 150));
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 0.5);
controller.forward();
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 0.5);
await tester.pump();
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 0.5);
await tester.pump(const Duration(milliseconds: 75));
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 0.75);
await tester.pump(const Duration(milliseconds: 75));
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 1.0);
await tester.pumpAndSettle();
expect(_getScale(tester), 1.0);
expect(_getOpacity(tester), 1.0);
});
}
double _getScale(WidgetTester tester) {
final ScaleTransition scale = tester.widget(find.byType(ScaleTransition));
return scale.scale.value;
}
double _getOpacity(WidgetTester tester) {
final FadeTransition scale = tester.widget(find.byType(FadeTransition));
return scale.opacity.value;
}
class _StatefulTestWidget extends StatefulWidget {
const _StatefulTestWidget({required this.name});
final String name;
@override
State<_StatefulTestWidget> createState() => _StatefulTestWidgetState();
}
class _StatefulTestWidgetState extends State<_StatefulTestWidget> {
@override
Widget build(BuildContext context) {
return Text(widget.name);
}
}