57 lines
2.2 KiB
Dart
57 lines
2.2 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/painting.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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test('FractionalOffset control test', () {
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const a = FractionalOffset(0.5, 0.25);
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const b = FractionalOffset(1.25, 0.75);
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expect(a, hasOneLineDescription);
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expect(a.hashCode, equals(const FractionalOffset(0.5, 0.25).hashCode));
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expect(a.toString(), equals('FractionalOffset(0.5, 0.3)'));
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expect(-a, const FractionalOffset(-0.5, -0.25));
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expect(a - b, const FractionalOffset(-0.75, -0.5));
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expect(a + b, const FractionalOffset(1.75, 1.0));
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expect(a * 2.0, FractionalOffset.centerRight);
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expect(a / 2.0, const FractionalOffset(0.25, 0.125));
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expect(a ~/ 2.0, FractionalOffset.topLeft);
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expect(a % 5.0, const FractionalOffset(0.5, 0.25));
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});
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test('FractionalOffset.lerp()', () {
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const FractionalOffset a = FractionalOffset.topLeft;
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const FractionalOffset b = FractionalOffset.topCenter;
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expect(FractionalOffset.lerp(a, b, 0.25), equals(const FractionalOffset(0.125, 0.0)));
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expect(FractionalOffset.lerp(null, null, 0.25), isNull);
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expect(FractionalOffset.lerp(null, b, 0.25), equals(const FractionalOffset(0.5, 0.5 - 0.125)));
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expect(FractionalOffset.lerp(a, null, 0.25), equals(const FractionalOffset(0.125, 0.125)));
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});
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test('FractionalOffset.lerp identical a,b', () {
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expect(FractionalOffset.lerp(null, null, 0), null);
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const decoration = FractionalOffset(1, 2);
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expect(identical(FractionalOffset.lerp(decoration, decoration, 0.5), decoration), true);
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});
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test('FractionalOffset.fromOffsetAndSize()', () {
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final a = FractionalOffset.fromOffsetAndSize(
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const Offset(100.0, 100.0),
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const Size(200.0, 400.0),
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);
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expect(a, const FractionalOffset(0.5, 0.25));
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});
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test('FractionalOffset.fromOffsetAndRect()', () {
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final a = FractionalOffset.fromOffsetAndRect(
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const Offset(150.0, 120.0),
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const Rect.fromLTWH(50.0, 20.0, 200.0, 400.0),
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);
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expect(a, const FractionalOffset(0.5, 0.25));
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});
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}
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