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Add test for constricting the max size of a ConstrainedBox
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‎UnitTests/UnitTests.UWP/UI/Controls/Test_ConstrainedBox.Constrict.cs

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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System.Linq;
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using System.Threading.Tasks;
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using Microsoft.Toolkit.Uwp;
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using Microsoft.Toolkit.Uwp.UI;
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using Microsoft.Toolkit.Uwp.UI.Controls;
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using Microsoft.VisualStudio.TestTools.UnitTesting.AppContainer;
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using Windows.Foundation;
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Controls;
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using Windows.UI.Xaml.Markup;
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namespace UnitTests.UWP.UI.Controls
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{
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/// <summary>
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/// These tests check for cases where we want to constrain the size of the ConstrainedBox with other
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/// properties like MaxWidth and MaxHeight. The ConstrainedBox is greedy about using all the available
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/// space, so Min properties don't really play the same factor? At least hard to create a practical test.
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/// </summary>
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public partial class Test_ConstrainedBox : VisualUITestBase
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{
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[TestCategory("ConstrainedBox")]
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[TestMethod]
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public async Task Test_ConstrainedBox_Constrain_AspectMaxHeight()
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{
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await App.DispatcherQueue.EnqueueAsync(async () =>
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{
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// Even though we constrain the size of the ScrollViewer, it initially reports infinite measure
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// which is what we want to test. We constrain the dimension so that we have a specific value
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// that we can measure against. If we instead restrained the inner Border, it'd just set
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// it's side within the constrained space of the parent layout...
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var treeRoot = XamlReader.Load(@"<Page
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xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
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xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
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xmlns:controls=""using:Microsoft.Toolkit.Uwp.UI.Controls"">
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<Grid HorizontalAlignment=""Center"" VerticalAlignment=""Center"">
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<controls:ConstrainedBox x:Name=""ConstrainedBox"" AspectRatio=""2:1"" MaxHeight=""100"">
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<Border HorizontalAlignment=""Stretch"" VerticalAlignment=""Stretch"" Background=""Red""/>
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</controls:ConstrainedBox>
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</Grid>
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</Page>") as FrameworkElement;
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Assert.IsNotNull(treeRoot, "Could not load XAML tree.");
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// Initialize Visual Tree
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await SetTestContentAsync(treeRoot);
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var panel = treeRoot.FindChild("ConstrainedBox") as ConstrainedBox;
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Assert.IsNotNull(panel, "Could not find ConstrainedBox in tree.");
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// Force Layout calculations
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panel.UpdateLayout();
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var child = panel.Content as Border;
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Assert.IsNotNull(child, "Could not find inner Border");
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// Check Size
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Assert.AreEqual(200, child.ActualWidth, 0.01, "Actual width does not meet expected value of 200");
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Assert.AreEqual(100, child.ActualHeight, 0.01, "Actual height does not meet expected value of 100");
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});
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}
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[TestCategory("ConstrainedBox")]
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[TestMethod]
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public async Task Test_ConstrainedBox_Constrain_AspectMaxWidth()
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{
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await App.DispatcherQueue.EnqueueAsync(async () =>
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{
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var treeRoot = XamlReader.Load(@"<Page
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xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
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xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
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xmlns:controls=""using:Microsoft.Toolkit.Uwp.UI.Controls"">
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<Grid HorizontalAlignment=""Center"" VerticalAlignment=""Center"">
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<controls:ConstrainedBox x:Name=""ConstrainedBox"" AspectRatio=""2:1"" MaxWidth=""100"">
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<Border HorizontalAlignment=""Stretch"" VerticalAlignment=""Stretch"" Background=""Red""/>
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</controls:ConstrainedBox>
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</Grid>
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</Page>") as FrameworkElement;
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Assert.IsNotNull(treeRoot, "Could not load XAML tree.");
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// Initialize Visual Tree
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await SetTestContentAsync(treeRoot);
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var panel = treeRoot.FindChild("ConstrainedBox") as ConstrainedBox;
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Assert.IsNotNull(panel, "Could not find ConstrainedBox in tree.");
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// Force Layout calculations
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panel.UpdateLayout();
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var child = panel.Content as Border;
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Assert.IsNotNull(child, "Could not find inner Border");
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// Check Size
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Assert.AreEqual(100, child.ActualWidth, 0.01, "Actual width does not meet expected value of 100");
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Assert.AreEqual(50, child.ActualHeight, 0.01, "Actual height does not meet expected value of 50");
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});
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}
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[TestCategory("ConstrainedBox")]
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[TestMethod]
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public async Task Test_ConstrainedBox_Constrain_AspectBothMaxWidthHeight()
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{
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await App.DispatcherQueue.EnqueueAsync(async () =>
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{
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var treeRoot = XamlReader.Load(@"<Page
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xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
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xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
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xmlns:controls=""using:Microsoft.Toolkit.Uwp.UI.Controls"">
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<Grid HorizontalAlignment=""Center"" VerticalAlignment=""Center"">
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<controls:ConstrainedBox x:Name=""ConstrainedBox"" AspectRatio=""1:2"" MaxWidth=""200"" MaxHeight=""200"">
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<Border HorizontalAlignment=""Stretch"" VerticalAlignment=""Stretch"" Background=""Red""/>
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</controls:ConstrainedBox>
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</Grid>
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</Page>") as FrameworkElement;
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Assert.IsNotNull(treeRoot, "Could not load XAML tree.");
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// Initialize Visual Tree
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await SetTestContentAsync(treeRoot);
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var panel = treeRoot.FindChild("ConstrainedBox") as ConstrainedBox;
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Assert.IsNotNull(panel, "Could not find ConstrainedBox in tree.");
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// Force Layout calculations
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panel.UpdateLayout();
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var child = panel.Content as Border;
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Assert.IsNotNull(child, "Could not find inner Border");
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// Check Size
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Assert.AreEqual(100, child.ActualWidth, 0.01, "Actual width does not meet expected value of 100");
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Assert.AreEqual(200, child.ActualHeight, 0.01, "Actual height does not meet expected value of 200");
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});
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}
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}
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}

‎UnitTests/UnitTests.UWP/UnitTests.UWP.csproj

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<Compile Include="UI\Collection\Test_IncrementalLoadingCollection.cs" />
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<Compile Include="UI\Controls\Test_Carousel.cs" />
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<Compile Include="UI\Controls\Test_BladeView.cs" />
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<Compile Include="UI\Controls\Test_ConstrainedBox.Constrict.cs" />
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<Compile Include="UI\Controls\Test_ConstrainedBox.Infinity.cs" />
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<Compile Include="UI\Controls\Test_ConstrainedBox.AspectRatio.cs" />
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<Compile Include="UI\Controls\Test_ConstrainedBox.Coerce.cs" />

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