feat: add resource converter.

src/Irihi.Avalonia.Shared.Public/Converters/ResourceConverter.cs

@@ -0,0 +1,20 @@
+using System.Globalization;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Data.Converters;
+
+namespace Irihi.Avalonia.Shared.Converters;
+
+public class ResourceConverter : ResourceDictionary, IValueConverter
+{
+    public virtual object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is null) return AvaloniaProperty.UnsetValue;
+        return TryGetResource(value, null, out var resource) ? resource : AvaloniaProperty.UnsetValue;
+    }
+
+    public virtual object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}

src/Irihi.Avalonia.Shared.Public/Irihi.Avalonia.Shared.Public.projitems

@@ -20,6 +20,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Contracts\IOuterContentControl.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Contracts\IPopupInnerContent.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Contracts\IPopupOuterContent.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Converters\ResourceConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\AvaloniaPropertyExtension.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\BindingExtension.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\LogicalHelpers.cs" />

test/Irihi.Avalonia.Shared.UnitTest.Public/Converters/ResourceConverterTests.cs

@@ -0,0 +1,96 @@
+using System.Globalization;
+using Avalonia;
+using Avalonia.Media;
+using Irihi.Avalonia.Shared.Converters;
+using Irihi.Avalonia.Shared.UnitTest.Mocks;
+
+// Ensure this namespace matches your actual namespace
+namespace Irihi.Avalonia.Shared.UnitTest.Converters;
+
+public class ResourceConverterTests
+{
+    private readonly ResourceConverter _converter = new();
+
+    [Fact]
+    public void Convert_WithNullValue_ReturnsAvaloniaPropertyUnsetValue()
+    {
+        // Arrange
+        object? value = null;
+        var targetType = typeof(object); // Or a specific type if applicable
+        object? parameter = null;
+        var culture = CultureInfo.InvariantCulture;
+
+        // Act
+        var result = _converter.Convert(value, targetType, parameter, culture);
+
+        // Assert
+        Assert.Equal(AvaloniaProperty.UnsetValue, result);
+    }
+
+    [Fact]
+    public void Convert_WithExistingResource_ReturnsResource()
+    {
+        // Arrange
+        // Assuming you would add a known resource to your converter for testing purposes
+        _converter["TestResource"] = "TestValue";
+        object value = "TestResource";
+        var targetType = typeof(string); // Assuming the target type you expect
+        object? parameter = null;
+        var culture = CultureInfo.InvariantCulture;
+
+        // Act
+        var result = _converter.Convert(value, targetType, parameter, culture);
+
+        // Assert
+        Assert.Equal("TestValue", result);
+    }
+
+    [Fact]
+    public void Convert_WithNonExistentResource_ReturnsAvaloniaPropertyUnsetValue()
+    {
+        // Arrange
+        object value = "NonExistentResource";
+        var targetType = typeof(string); // Or the expected type
+        object? parameter = null;
+        var culture = CultureInfo.InvariantCulture;
+
+        // Act
+        var result = _converter.Convert(value, targetType, parameter, culture);
+
+        // Assert
+        Assert.Equal(AvaloniaProperty.UnsetValue, result);
+    }
+
+    // Note: The ConvertBack method is not tested since it's not implemented.
+    // If it gets implemented in the future, similar test cases should be written for it.
+
+    [Fact]
+    public void ConvertBack_ThrowsNotImplementedException()
+    {
+        // Arrange
+        object? value = null;
+        var targetType = typeof(object); // Or a specific type if applicable
+        object? parameter = null;
+        var culture = CultureInfo.InvariantCulture;
+
+        // Act & Assert
+        Assert.Throws<NotImplementedException>(() => _converter.ConvertBack(value, targetType, parameter, culture));
+    }
+
+    [Fact]
+    public void ConvertFromDerivedClass_Success()
+    {
+        // Arrange
+        var derivedConverter = new MockResourceConverter();
+        object value = "Red";
+        var targetType = typeof(IBrush); // Assuming the target type you expect
+        object? parameter = null;
+        var culture = CultureInfo.InvariantCulture;
+
+        // Act
+        var result = derivedConverter.Convert(value, targetType, parameter, culture);
+
+        // Assert
+        Assert.Equal(Brushes.Red.Color, (result as ISolidColorBrush)?.Color);
+    }
+}

test/Irihi.Avalonia.Shared.UnitTest.Public/Irihi.Avalonia.Shared.UnitTest.Public.projitems

@@ -12,6 +12,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Common\IRIHI_CommandBaseGenericTests.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Common\IRIHI_CommandBaseTests.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Common\IRIHI_ObservableBaseTests.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Converters\ResourceConverterTests.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)GlobalUsings.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\AffectsPseudoClassTests.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\AvaloniaPropertyExtensionTest.cs" />
@@ -21,7 +22,11 @@
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\ObservableExtensionTest.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\PropertyPseudoClassHelperTest.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Helpers\RoutedEventExtensionTest.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Mocks\MockResourceConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Shapes\PureCircleTest.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Shapes\PureRingTest.cs" />
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="$(MSBuildThisFileDirectory)Mocks\MockResourceConverter.axaml" />
+  </ItemGroup>
 </Project>

test/Irihi.Avalonia.Shared.UnitTest.Public/Mocks/MockResourceConverter.axaml

@@ -0,0 +1,9 @@
+<ResourceDictionary
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns="https://github.com/avaloniaui"
+    x:Class="Irihi.Avalonia.Shared.UnitTest.Mocks.MockResourceConverter">
+    <SolidColorBrush x:Key="Red" Color="Red"/>
+    <SolidColorBrush x:Key="Green" Color="Green"/>
+    <SolidColorBrush x:Key="Blue" Color="Blue"/>
+    <SolidColorBrush x:Key="Yellow" Color="Yellow"/>
+</ResourceDictionary>

test/Irihi.Avalonia.Shared.UnitTest.Public/Mocks/MockResourceConverter.cs

@@ -0,0 +1,8 @@
+using Irihi.Avalonia.Shared.Converters;
+
+namespace Irihi.Avalonia.Shared.UnitTest.Mocks;
+
+public class MockResourceConverter: ResourceConverter
+{
+
+}

test/Irihi.Avalonia.Shared.UnitTest/Irihi.Avalonia.Shared.UnitTest.csproj

@@ -9,6 +9,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="Avalonia" Version="11.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
         <PackageReference Include="xunit" Version="2.4.2" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
@@ -24,6 +25,10 @@
     <ItemGroup>
       <ProjectReference Include="..\..\src\Irihi.Avalonia.Shared\Irihi.Avalonia.Shared.csproj" />
     </ItemGroup>
+
+    <ItemGroup>
+        <AvaloniaResource Include="..\Irihi.Avalonia.Shared.UnitTest.Public\Mocks\MockResourceConverter.axaml" />
+    </ItemGroup>
 
     <Import Project="..\Irihi.Avalonia.Shared.UnitTest.Public\Irihi.Avalonia.Shared.UnitTest.Public.projitems" Label="Shared" />