Steven Kirk
6 years ago
committed by
GitHub
GitHub
17 changed files with 582 additions and 73 deletions
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// Copyright (c) The Avalonia Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using System.Collections.Generic; |
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using System.Globalization; |
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using System.Linq; |
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using System.Reactive.Linq; |
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using System.Reactive.Subjects; |
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using Avalonia.Data; |
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using Avalonia.Data.Converters; |
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using Xunit; |
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namespace Avalonia.Base.UnitTests |
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{ |
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public class AvaloniaObjectTests_MultiBinding |
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{ |
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[Fact] |
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public void Should_Update() |
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{ |
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var target = new Class1(); |
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var b = new Subject<object>(); |
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var mb = new MultiBinding() |
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{ |
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Converter = StringJoinConverter, |
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Bindings = new[] |
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{ |
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b.ToBinding() |
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} |
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}; |
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target.Bind(Class1.FooProperty, mb); |
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Assert.Equal(null, target.Foo); |
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b.OnNext("Foo"); |
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Assert.Equal("Foo", target.Foo); |
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b.OnNext("Bar"); |
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Assert.Equal("Bar", target.Foo); |
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} |
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[Fact] |
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public void Should_Update_With_Multiple_Bindings() |
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{ |
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var target = new Class1(); |
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var bindings = Enumerable.Range(0, 3).Select(i => new BehaviorSubject<object>("Empty")).ToArray(); |
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var mb = new MultiBinding() |
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{ |
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Converter = StringJoinConverter, |
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Bindings = bindings.Select(b => b.ToBinding()).ToArray() |
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}; |
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target.Bind(Class1.FooProperty, mb); |
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Assert.Equal("Empty,Empty,Empty", target.Foo); |
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bindings[0].OnNext("Foo"); |
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Assert.Equal("Foo,Empty,Empty", target.Foo); |
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bindings[1].OnNext("Bar"); |
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Assert.Equal("Foo,Bar,Empty", target.Foo); |
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bindings[2].OnNext("Baz"); |
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Assert.Equal("Foo,Bar,Baz", target.Foo); |
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} |
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[Fact] |
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public void Should_Update_When_Null_Value_In_Bindings() |
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{ |
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var target = new Class1(); |
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var b = new Subject<object>(); |
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var mb = new MultiBinding() |
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{ |
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Converter = StringJoinConverter, |
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Bindings = new[] |
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{ |
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b.ToBinding() |
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} |
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}; |
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target.Bind(Class1.FooProperty, mb); |
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Assert.Equal(null, target.Foo); |
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b.OnNext("Foo"); |
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Assert.Equal("Foo", target.Foo); |
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b.OnNext(null); |
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Assert.Equal("", target.Foo); |
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} |
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[Fact] |
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public void Should_Update_When_Null_Value_In_Bindings_With_StringFormat() |
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{ |
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var target = new Class1(); |
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var b = new Subject<object>(); |
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var mb = new MultiBinding() |
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{ |
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StringFormat = "Converted: {0}", |
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Bindings = new[] |
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{ |
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b.ToBinding() |
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} |
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}; |
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target.Bind(Class1.FooProperty, mb); |
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Assert.Equal(null, target.Foo); |
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b.OnNext("Foo"); |
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Assert.Equal("Converted: Foo", target.Foo); |
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b.OnNext(null); |
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Assert.Equal("Converted: ", target.Foo); |
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} |
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[Fact] |
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public void MultiValueConverter_Should_Not_Skip_Valid_Null_ReferenceType_Value() |
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{ |
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var target = new FuncMultiValueConverter<string, string>(v => string.Join(",", v.ToArray())); |
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object value = target.Convert(new[] { "Foo", "Bar", "Baz" }, typeof(string), null, CultureInfo.InvariantCulture); |
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Assert.Equal("Foo,Bar,Baz", value); |
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value = target.Convert(new[] { null, "Bar", "Baz" }, typeof(string), null, CultureInfo.InvariantCulture); |
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Assert.Equal(",Bar,Baz", value); |
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} |
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[Fact] |
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public void MultiValueConverter_Should_Not_Skip_Valid_Default_ValueType_Value() |
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{ |
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var target = new FuncMultiValueConverter<StringValueTypeWrapper, string>(v => string.Join(",", v.ToArray())); |
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IList<object> create(string[] values) => |
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values.Select(v => (object)(v != null ? new StringValueTypeWrapper() { Value = v } : default)).ToList(); |
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object value = target.Convert(create(new[] { "Foo", "Bar", "Baz" }), typeof(string), null, CultureInfo.InvariantCulture); |
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Assert.Equal("Foo,Bar,Baz", value); |
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value = target.Convert(create(new[] { null, "Bar", "Baz" }), typeof(string), null, CultureInfo.InvariantCulture); |
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Assert.Equal(",Bar,Baz", value); |
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} |
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private struct StringValueTypeWrapper |
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{ |
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public string Value; |
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public override string ToString() => Value; |
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} |
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private static IMultiValueConverter StringJoinConverter = new FuncMultiValueConverter<object, string>(v => string.Join(",", v.ToArray())); |
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private class Class1 : AvaloniaObject |
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{ |
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public static readonly StyledProperty<string> FooProperty = |
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AvaloniaProperty.Register<Class1, string>("Foo"); |
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public string Foo |
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{ |
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get => GetValue(FooProperty); |
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set => SetValue(FooProperty, value); |
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} |
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} |
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} |
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} |
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