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Add AutoSelectBehavior (#3786)
## Fixes #3790 Introduce a new AutoSelect behavior that automatically selects the entire content of its associated TextBox when it is loaded. ## PR Type What kind of change does this PR introduce? Feature Sample app changes ## What is the current behavior? N/A ## What is the new behavior? N/A ## PR Checklist Please check if your PR fulfills the following requirements: - [x] Tested code with current [supported SDKs](../readme.md#supported) - [x] Pull Request has been submitted to the documentation repository [instructions](..\contributing.md#docs). Link: MicrosoftDocs/WindowsCommunityToolkitDocs#525 - [x] Sample in sample app has been added / updated (for bug fixes / features) - [ ] Icon has been created (if new sample) following the [Thumbnail Style Guide and templates](https://github.com/windows-toolkit/WindowsCommunityToolkit-design-assets) - [ ] New major technical changes in the toolkit have or will be added to the [Wiki](https://github.com/windows-toolkit/WindowsCommunityToolkit/wiki) e.g. build changes, source generators, testing infrastructure, sample creation changes, etc... - [x] Tests for the changes have been added (for bug fixes / features) (if applicable) - [x] Header has been added to all new source files (run *build/UpdateHeaders.bat*) - [x] Contains **NO** breaking changes ## Other information N/A
2 parents e8029ec + d38bd78 commit 6827aab

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‎Microsoft.Toolkit.Uwp.SampleApp/Microsoft.Toolkit.Uwp.SampleApp.csproj‎

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<Content Include="SamplePages\VisualEffectFactory\VisualEffectFactory.bind" />
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<Content Include="SamplePages\Animations\Activities\InvokeActionsActivityCode.bind" />
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<Content Include="SamplePages\Animations\Activities\StartAnimationActivityCode.bind" />
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<Content Include="SamplePages\AutoSelectBehavior\AutoSelectBehaviorXaml.bind" />
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<Content Include="SamplePages\Graph\LoginButtonXaml.bind" />
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<Content Include="SamplePages\Graph\PeoplePickerXaml.bind" />
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<Content Include="SamplePages\Graph\PersonViewXaml.bind" />

‎Microsoft.Toolkit.Uwp.SampleApp/SamplePages/AutoSelectBehavior/AutoSelectBehaviorXaml.bind‎

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<Page 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:behaviors="using:Microsoft.Toolkit.Uwp.UI.Behaviors"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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mc:Ignorable="d">
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<Grid>
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<StackPanel HorizontalAlignment="Center"
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VerticalAlignment="Center">
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<TextBox Text="My content is not selected when loaded" />
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<TextBox Text="My content is selected when loaded">
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<interactivity:Interaction.Behaviors>
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<behaviors:AutoSelectBehavior />
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</interactivity:Interaction.Behaviors>
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</TextBox>
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</StackPanel>
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</Grid>
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</Page>

‎Microsoft.Toolkit.Uwp.SampleApp/SamplePages/XamlOnlyPage.xaml‎

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<triggers:UserHandPreferenceStateTrigger x:Key="UserHandPreferenceStateTrigger" />
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<triggers:UserInteractionModeStateTrigger x:Key="UserInteractionModeStateTrigger" />
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<behaviors:StartAnimationAction x:Key="StartAnimationAction" />
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<behaviors:AutoSelectBehavior x:Key="AutoSelectBehavior" />
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<controls:ColorPicker x:Key="ColorPicker" />
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<controls:ColorPickerButton x:Key="ColorPickerButton" />
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<primitives:ColorPickerSlider x:Key="ColorPickerSlider" />

‎Microsoft.Toolkit.Uwp.SampleApp/SamplePages/samples.json‎

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"Icon": "/Assets/Helpers.png",
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"DocumentationUrl": "https://raw.githubusercontent.com/MicrosoftDocs/WindowsCommunityToolkitDocs/master/docs/behaviors/FocusBehaviors.md"
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},
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{
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"Name": "AutoSelectBehavior",
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"Subcategory": "Systems",
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"About": "Behavior to automatically select the entire content of a TextBox control when it loads",
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"CodeUrl": "https://github.com/windows-toolkit/WindowsCommunityToolkit/tree/master/Microsoft.Toolkit.Uwp.UI/Behaviors/",
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"XamlCodeFile": "/SamplePages/AutoSelectBehavior/AutoSelectBehaviorXaml.bind",
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"Icon": "/Assets/Helpers.png",
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"DocumentationUrl": "https://raw.githubusercontent.com/MicrosoftDocs/WindowsCommunityToolkitDocs/master/docs/behaviors/AutoSelectBehavior.md"
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},
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{
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"Name": "Win2d Path Mini Language Parser",
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"Type": "CanvasPathGeometryPage",

‎Microsoft.Toolkit.Uwp.UI.Behaviors/Select/AutoSelectBehavior.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 Windows.UI.Xaml.Controls;
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namespace Microsoft.Toolkit.Uwp.UI.Behaviors
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{
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/// <summary>
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/// This behavior automatically selects the entire content of the associated <see cref="TextBox"/> when it is loaded.
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/// </summary>
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public sealed class AutoSelectBehavior : BehaviorBase<TextBox>
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{
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/// <inheritdoc/>
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protected override void OnAssociatedObjectLoaded() => AssociatedObject.SelectAll();
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}
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}

‎UnitTests/UnitTests.UWP/Behaviors/Test_AutoSelectBehavior.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 FluentAssertions;
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using Microsoft.Toolkit.Uwp;
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using Microsoft.Toolkit.Uwp.UI;
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using System.Threading.Tasks;
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using Windows.UI.Xaml.Controls;
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using Windows.UI.Xaml.Markup;
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namespace UnitTests.Behaviors
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{
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[TestClass]
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public class Test_AutoSelectBehavior : VisualUITestBase
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{
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[TestCategory("Behaviors")]
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[TestMethod]
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public async Task Test_AutoSelectBehavior_SelectsAllContent()
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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:behaviors=""using:Microsoft.Toolkit.Uwp.UI.Behaviors""
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xmlns:interactivity=""using:Microsoft.Xaml.Interactivity"">
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<Grid>
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<TextBox x:Name=""TargetElement"" Text=""ThisShouldBeSelectedWhenLoaded"">
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<interactivity:Interaction.Behaviors>
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<behaviors:AutoSelectBehavior />
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</interactivity:Interaction.Behaviors>
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</TextBox>
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</Grid>
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</Page>") as Page;
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// Test Setup
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Assert.IsNotNull(treeRoot, "XAML Failed to Load");
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// Initialize Visual Tree
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await SetTestContentAsync(treeRoot);
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// Main Test
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var textBox = treeRoot.FindName("TargetElement") as TextBox;
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Assert.IsNotNull(textBox, "TextBox was not found in the tree.");
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textBox.SelectedText.Should().Be("ThisShouldBeSelectedWhenLoaded");
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});
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}
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}
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}

‎UnitTests/UnitTests.UWP/UnitTestApp.xaml‎

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<Application x:Class="UnitTests.App"
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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:behaviors="using:Microsoft.Toolkit.Uwp.UI.Behaviors"
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xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls"
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xmlns:ui="using:Microsoft.Toolkit.Uwp.UI"
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xmlns:helpers="using:UnitTests.Extensions.Helpers"
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xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
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xmlns:ui="using:Microsoft.Toolkit.Uwp.UI"
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xmlns:unitTestExtensions="using:UnitTests.Extensions"
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RequestedTheme="Light">
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<Application.Resources>
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</Button.Flyout>
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</Button>
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<TextBox x:Key="DummyTextBox">
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<interactivity:Interaction.Behaviors>
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<behaviors:AutoSelectBehavior />
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</interactivity:Interaction.Behaviors>
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</TextBox>
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<Style TargetType="controls:UniformGrid" />
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<ui:NullableBoolExtension x:Key="nullableBool" />
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‎UnitTests/UnitTests.UWP/UnitTests.UWP.csproj‎

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</PackageReference>
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Behaviors\Test_AutoSelectBehavior.cs" />
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<Compile Include="Converters\Test_AdaptiveHeightValueConverter.cs" />
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<Compile Include="Converters\Test_TaskResultConverter.cs" />
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<Compile Include="Converters\Test_BoolToObjectConverter.cs" />
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<Project>{b24a296c-b3eb-4e06-a64e-74ac2d1acc91}</Project>
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<Name>Microsoft.Toolkit.Uwp.UI.Animations</Name>
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</ProjectReference>
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<ProjectReference Include="..\..\Microsoft.Toolkit.Uwp.UI.Behaviors\Microsoft.Toolkit.Uwp.UI.Behaviors.csproj">
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<Project>{d4ff799d-0df2-495a-adc9-3bbc4aef8971}</Project>
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<Name>Microsoft.Toolkit.Uwp.UI.Behaviors</Name>
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</ProjectReference>
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<ProjectReference Include="..\..\Microsoft.Toolkit.Uwp.UI.Controls.Layout\Microsoft.Toolkit.Uwp.UI.Controls.Layout.csproj">
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<Project>{cb444381-18ba-4a51-bb32-3a498bcc1e99}</Project>
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<Name>Microsoft.Toolkit.Uwp.UI.Controls.Layout</Name>

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