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Merge pull request #2385 from OronDF343/patch-1
Add support for ConverterParameter and StringFormat to MultiBinding
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tests/Avalonia.Markup.UnitTests/Data/MultiBindingTests_Converters.cs
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// Copyright (c) The Avalonia Project. All rights reserved. | ||
// Licensed under the MIT license. See license.md file in the project root for full license information. | ||
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using System; | ||
using System.Collections.Generic; | ||
using System.Globalization; | ||
using System.Linq; | ||
using System.Text; | ||
using Avalonia.Controls; | ||
using Avalonia.Data; | ||
using Avalonia.Data.Converters; | ||
using Avalonia.Data.Core; | ||
using Xunit; | ||
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namespace Avalonia.Markup.UnitTests.Data | ||
{ | ||
public class MultiBindingTests_Converters | ||
{ | ||
[Fact] | ||
public void StringFormat_Should_Be_Applied() | ||
{ | ||
var textBlock = new TextBlock | ||
{ | ||
DataContext = new MultiBindingTests_Converters.Class1(), | ||
}; | ||
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var target = new MultiBinding | ||
{ | ||
StringFormat = "Foo + Bar = {0}", | ||
Converter = new SumOfDoublesConverter(), | ||
Bindings = | ||
{ | ||
new Binding(nameof(MultiBindingTests_Converters.Class1.Foo)), | ||
new Binding(nameof(MultiBindingTests_Converters.Class1.Bar)), | ||
} | ||
}; | ||
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textBlock.Bind(TextBlock.TextProperty, target); | ||
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Assert.Equal("Foo + Bar = 3", textBlock.Text); | ||
} | ||
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[Fact] | ||
public void StringFormat_Should_Not_Be_Applied_When_Binding_To_Non_String_Or_Object() | ||
{ | ||
var textBlock = new TextBlock | ||
{ | ||
DataContext = new MultiBindingTests_Converters.Class1(), | ||
}; | ||
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var target = new MultiBinding | ||
{ | ||
StringFormat = "Hello {0}", | ||
Converter = new SumOfDoublesConverter(), | ||
Bindings = | ||
{ | ||
new Binding(nameof(MultiBindingTests_Converters.Class1.Foo)), | ||
new Binding(nameof(MultiBindingTests_Converters.Class1.Bar)), | ||
} | ||
}; | ||
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textBlock.Bind(TextBlock.WidthProperty, target); | ||
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Assert.Equal(3.0, textBlock.Width); | ||
} | ||
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private class SumOfDoublesConverter : IMultiValueConverter | ||
{ | ||
public object Convert(IList<object> values, Type targetType, object parameter, CultureInfo culture) | ||
{ | ||
return values.OfType<double>().Sum(); | ||
} | ||
} | ||
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private class Class1 | ||
{ | ||
public double Foo { get; set; } = 1; | ||
public double Bar { get; set; } = 2; | ||
} | ||
} | ||
} |