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ClassHelper
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| using System.Collections.Specialized; | ||
| using Avalonia; | ||
| using Avalonia.Collections; | ||
|
|
||
| namespace Irihi.Avalonia.Shared.Helpers; | ||
|
|
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| public class ClassHelper | ||
| { | ||
| public static readonly AttachedProperty<string> ClassesProperty = | ||
| AvaloniaProperty.RegisterAttached<ClassHelper, StyledElement, string>("Classes"); | ||
|
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| public static readonly AttachedProperty<StyledElement> ClassSourceProperty = | ||
| AvaloniaProperty.RegisterAttached<ClassHelper, StyledElement, StyledElement>("ClassSource"); | ||
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| static ClassHelper() | ||
| { | ||
| ClassesProperty.Changed.AddClassHandler<StyledElement>(OnClassesChanged); | ||
| ClassSourceProperty.Changed.AddClassHandler<StyledElement>(OnClassSourceChanged); | ||
| } | ||
|
|
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| private static void OnClassSourceChanged(StyledElement arg1, AvaloniaPropertyChangedEventArgs arg2) | ||
| { | ||
| if (arg2.NewValue is not StyledElement styledElement) return; | ||
| arg1.Classes.Clear(); | ||
| var nonPseudoClasses = styledElement.Classes.Where(c => !c.StartsWith(":")); | ||
| arg1.Classes.AddRange(nonPseudoClasses); | ||
| styledElement.Classes.WeakSubscribe((o, e) => OnSourceClassesChanged(o, e, arg1)); | ||
| } | ||
|
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| private static void OnSourceClassesChanged(object sender, NotifyCollectionChangedEventArgs e, StyledElement target) | ||
| { | ||
| if (sender is not AvaloniaList<string> classes) return; | ||
| target.Classes.Clear(); | ||
| var nonPseudoClasses = classes.Where(c => !c.StartsWith(":")); | ||
| target.Classes.AddRange(nonPseudoClasses); | ||
| } | ||
|
|
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| public static void SetClasses(AvaloniaObject obj, string value) | ||
| { | ||
| obj.SetValue(ClassesProperty, value); | ||
| } | ||
|
|
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| public static string GetClasses(AvaloniaObject obj) | ||
| { | ||
| return obj.GetValue(ClassesProperty); | ||
| } | ||
|
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| private static void OnClassesChanged(StyledElement sender, AvaloniaPropertyChangedEventArgs value) | ||
| { | ||
| var classes = value.GetNewValue<string?>(); | ||
| if (classes is null) return; | ||
| sender.Classes.Clear(); | ||
| sender.Classes.Add(classes); | ||
| } | ||
|
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| public static void SetClassSource(StyledElement obj, StyledElement value) | ||
| { | ||
| obj.SetValue(ClassSourceProperty, value); | ||
| } | ||
|
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| public static StyledElement GetClassSource(StyledElement obj) | ||
| { | ||
| return obj.GetValue(ClassSourceProperty); | ||
| } | ||
| } |
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86 changes: 86 additions & 0 deletions
86
test/Irihi.Avalonia.Shared.UnitTest.Public/Helpers/ClassHelperTests.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| using Avalonia.Controls; | ||
| using Avalonia.Styling; | ||
| using Irihi.Avalonia.Shared.Helpers; | ||
|
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| namespace Irihi.Avalonia.Shared.UnitTest.Helpers; | ||
|
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| public class ClassHelperTests | ||
| { | ||
| [Fact] | ||
| public void ClassesProperty_Should_Set_And_Get_Value() | ||
| { | ||
| var control = new Button(); | ||
| ClassHelper.SetClasses(control, "test-class"); | ||
| Assert.Equal("test-class", ClassHelper.GetClasses(control)); | ||
| } | ||
|
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| [Fact] | ||
| public void ClassSourceProperty_Should_Set_And_Get_Value() | ||
| { | ||
| var sourceControl = new Button(); | ||
| var targetControl = new Button(); | ||
| ClassHelper.SetClassSource(targetControl, sourceControl); | ||
| Assert.Equal(sourceControl, ClassHelper.GetClassSource(targetControl)); | ||
| } | ||
|
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| [Fact] | ||
| public void OnClassSourceChanged_Should_Copy_Classes() | ||
| { | ||
| var sourceControl = new Button(); | ||
| sourceControl.Classes.Add("source-class"); | ||
| var targetControl = new Button(); | ||
| ClassHelper.SetClassSource(targetControl, sourceControl); | ||
| Assert.Contains("source-class", targetControl.Classes); | ||
| } | ||
|
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| [Fact] | ||
| public void OnClassSourceChanged_Should_Not_Copy_PseudoClasses() | ||
| { | ||
| var sourceControl = new Button(); | ||
| IPseudoClasses pseudoClasses = sourceControl.Classes; | ||
| pseudoClasses.Add(":pseudo-class"); | ||
| var targetControl = new Button(); | ||
| ClassHelper.SetClassSource(targetControl, sourceControl); | ||
| Assert.DoesNotContain(":pseudo-class", targetControl.Classes); | ||
| } | ||
|
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| [Fact] | ||
| public void OnClassesChanged_Should_Update_Classes() | ||
| { | ||
| var control = new Button(); | ||
| ClassHelper.SetClasses(control, "initial-class"); | ||
| ClassHelper.SetClasses(control, "updated-class"); | ||
| Assert.Contains("updated-class", control.Classes); | ||
| Assert.DoesNotContain("initial-class", control.Classes); | ||
| } | ||
|
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| [Fact] | ||
| public void OnSourceClassesChanged_Should_Update_Target_Classes() | ||
| { | ||
| var sourceControl = new Button(); | ||
| var targetControl = new Button(); | ||
| ClassHelper.SetClassSource(targetControl, sourceControl); | ||
| sourceControl.Classes.Add("new-class"); | ||
| Assert.Contains("new-class", targetControl.Classes); | ||
| } | ||
|
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| [Fact] | ||
| public void OnClassesChanged_Should_Not_Remove_PseudoClasses() | ||
| { | ||
| var control = new Button(); | ||
| IPseudoClasses pseudoClasses = control.Classes; | ||
| pseudoClasses.Add(":pseudo-class"); | ||
| pseudoClasses.Add(":pseudo-class2"); | ||
| ClassHelper.SetClasses(control, "initial-class"); | ||
| Assert.Contains(":pseudo-class", control.Classes); | ||
| Assert.Contains(":pseudo-class2", control.Classes); | ||
| } | ||
|
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| [Fact] | ||
| public void ClassesProperty_Should_Not_Throw_Exception_When_Null() | ||
| { | ||
| var control = new Button(); | ||
| ClassHelper.SetClasses(control, null); | ||
| Assert.Null(ClassHelper.GetClasses(control)); | ||
| } | ||
| } |
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