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79 lines
3.2 KiB
Dart
79 lines
3.2 KiB
Dart
// Copyright 2017 The Chromium 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/widgets.dart';
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import 'package:flutter_test/flutter_test.dart';
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class TestScrollPhysics extends ScrollPhysics {
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const TestScrollPhysics({ this.name, ScrollPhysics parent }) : super(parent: parent);
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final String name;
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@override
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TestScrollPhysics applyTo(ScrollPhysics ancestor) {
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return new TestScrollPhysics(name: name, parent: parent?.applyTo(ancestor) ?? ancestor);
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}
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TestScrollPhysics get namedParent => parent;
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String get names => parent == null ? name : '$name ${namedParent.names}';
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@override
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String toString() {
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if (parent == null)
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return '$runtimeType($name)';
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return '$runtimeType($name) -> $parent';
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}
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}
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void main() {
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test('ScrollPhysics applyTo()', () {
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const ScrollPhysics a = const TestScrollPhysics(name: 'a');
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const ScrollPhysics b = const TestScrollPhysics(name: 'b');
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const ScrollPhysics c = const TestScrollPhysics(name: 'c');
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const ScrollPhysics d = const TestScrollPhysics(name: 'd');
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const ScrollPhysics e = const TestScrollPhysics(name: 'e');
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expect(a.parent, null);
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expect(b.parent, null);
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expect(c.parent, null);
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final TestScrollPhysics ab = a.applyTo(b);
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expect(ab.names, 'a b');
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final TestScrollPhysics abc = ab.applyTo(c);
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expect(abc.names, 'a b c');
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final TestScrollPhysics de = d.applyTo(e);
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expect(de.names, 'd e');
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final TestScrollPhysics abcde = abc.applyTo(de);
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expect(abcde.names, 'a b c d e');
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});
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test('ScrollPhysics subclasses applyTo()', () {
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const ScrollPhysics bounce = const BouncingScrollPhysics();
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const ScrollPhysics clamp = const ClampingScrollPhysics();
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const ScrollPhysics never = const NeverScrollableScrollPhysics();
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const ScrollPhysics always = const AlwaysScrollableScrollPhysics();
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const ScrollPhysics page = const PageScrollPhysics();
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String types(ScrollPhysics s) => s.parent == null ? '${s.runtimeType}' : '${s.runtimeType} ${types(s.parent)}';
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expect(types(bounce.applyTo(clamp.applyTo(never.applyTo(always.applyTo(page))))),
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'BouncingScrollPhysics ClampingScrollPhysics NeverScrollableScrollPhysics AlwaysScrollableScrollPhysics PageScrollPhysics');
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expect(types(clamp.applyTo(never.applyTo(always.applyTo(page.applyTo(bounce))))),
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'ClampingScrollPhysics NeverScrollableScrollPhysics AlwaysScrollableScrollPhysics PageScrollPhysics BouncingScrollPhysics');
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expect(types(never.applyTo(always.applyTo(page.applyTo(bounce.applyTo(clamp))))),
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'NeverScrollableScrollPhysics AlwaysScrollableScrollPhysics PageScrollPhysics BouncingScrollPhysics ClampingScrollPhysics');
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expect(types(always.applyTo(page.applyTo(bounce.applyTo(clamp.applyTo(never))))),
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'AlwaysScrollableScrollPhysics PageScrollPhysics BouncingScrollPhysics ClampingScrollPhysics NeverScrollableScrollPhysics');
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expect(types(page.applyTo(bounce.applyTo(clamp.applyTo(never.applyTo(always))))),
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'PageScrollPhysics BouncingScrollPhysics ClampingScrollPhysics NeverScrollableScrollPhysics AlwaysScrollableScrollPhysics');
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});
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}
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