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Fix a ConstantTween's clerical error and Add some Tween testcases. (#71830)

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houyushan 2020-12-10 06:48:03 +08:00 committed by GitHub
parent ceca634e98
commit d12098da8a
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2 changed files with 31 additions and 1 deletions
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2
packages/flutter/lib/src/animation/tween.dart
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@ -436,7 +436,7 @@ class ConstantTween<T> extends Tween<T> {
T lerp(double t) => begin as T;
@override
String toString() => '${objectRuntimeType(this, 'ReverseTween')}(value: $begin)';
String toString() => '${objectRuntimeType(this, 'ConstantTween')}(value: $begin)';
}
/// Transforms the value of the given animation by the given curve.

30
packages/flutter/test/animation/tween_test.dart
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@ -93,4 +93,34 @@ void main() {
expect(tween.lerp(0.5), 100.0);
expect(tween.lerp(1.0), 100.0);
});
test('ReverseTween', () {
final ReverseTween<int> tween = ReverseTween<int>(IntTween(begin: 5, end: 9));
expect(tween.lerp(0.5), 7);
expect(tween.lerp(0.7), 6);
});
test('ColorTween', () {
final ColorTween tween = ColorTween(
begin: const Color(0xff000000),
end: const Color(0xffffffff)
);
expect(tween.lerp(0.0), const Color(0xff000000));
expect(tween.lerp(0.5), const Color(0xff7f7f7f));
expect(tween.lerp(0.7), const Color(0xffb2b2b2));
expect(tween.lerp(1.0), const Color(0xffffffff));
});
test('StepTween', () {
final StepTween tween = StepTween(begin: 5, end: 9);
expect(tween.lerp(0.5), 7);
expect(tween.lerp(0.7), 7);
});
test('CurveTween', () {
final CurveTween tween = CurveTween(curve: Curves.easeIn);
expect(tween.transform(0.0), 0.0);
expect(tween.transform(0.5), 0.31640625);
expect(tween.transform(1.0), 1.0);
});
}