diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/AvaloniaXamlIlCompiler.cs b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/AvaloniaXamlIlCompiler.cs index 1ca7be67a7..04a61e5f10 100644 --- a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/AvaloniaXamlIlCompiler.cs +++ b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/AvaloniaXamlIlCompiler.cs @@ -35,7 +35,6 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions Transformers.Insert(2, _designTransformer = new AvaloniaXamlIlDesignPropertiesTransformer()); Transformers.Insert(3, _bindingTransformer = new AvaloniaBindingExtensionTransformer()); - // Targeted InsertBefore( new AvaloniaXamlIlResolveClassesPropertiesTransformer(), @@ -57,6 +56,9 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions new AvaloniaXamlIlResolveByNameMarkupExtensionReplacer() ); + InsertAfter( + new XDataTypeTransformer()); + // After everything else InsertBefore( new AddNameScopeRegistration(), diff --git a/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/XDataTypeTransformer.cs b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/XDataTypeTransformer.cs new file mode 100644 index 0000000000..845dc5f831 --- /dev/null +++ b/src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/XDataTypeTransformer.cs @@ -0,0 +1,73 @@ +using System.Collections.Generic; +using System.Linq; +using XamlX; +using XamlX.Ast; +using XamlX.Transform; +using XamlX.Transform.Transformers; +using XamlX.TypeSystem; + +namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers +{ + internal class XDataTypeTransformer : IXamlAstTransformer + { + private const string DataTypePropertyName = "DataType"; + + /// + /// Converts x:DataType directives to regular DataType assignments if property with Avalonia.Metadata.DataTypeAttribute exists. + /// + /// + public IXamlAstNode Transform(AstTransformationContext context, IXamlAstNode node) + { + if (node is XamlAstObjectNode on) + { + for (var c = 0; c < on.Children.Count; c++) + { + var ch = on.Children[c]; + if (ch is XamlAstXmlDirective { Namespace: XamlNamespaces.Xaml2006, Name: DataTypePropertyName } d) + { + if (on.Children.OfType() + .Any(p => ((XamlAstNamePropertyReference)p.Property)?.Name == DataTypePropertyName)) + { + // Break iteration if any DataType property was already set by user code. + break; + } + + var templateDataTypeAttribute = context.GetAvaloniaTypes().DataTypeAttribute; + + var clrType = (on.Type as XamlAstClrTypeReference)?.Type; + if (clrType is null) + { + break; + } + + // Technically it's possible to map "x:DataType" to a property with [DataType] attribute regardless of its name, + // but we go explicitly strict here and check the name as well. + var (declaringType, dataTypeProperty) = GetAllProperties(clrType) + .FirstOrDefault(t => t.property.Name == DataTypePropertyName && t.property.CustomAttributes + .Any(a => a.Type == templateDataTypeAttribute)); + + if (dataTypeProperty is not null) + { + on.Children[c] = new XamlAstXamlPropertyValueNode(d, + new XamlAstNamePropertyReference(d, + new XamlAstClrTypeReference(ch, declaringType, false), dataTypeProperty.Name, + on.Type), + d.Values); + } + } + } + } + + return node; + } + + private static IEnumerable<(IXamlType declaringType, IXamlProperty property)> GetAllProperties(IXamlType t) + { + foreach (var p in t.Properties) + yield return (t, p); + if(t.BaseType!=null) + foreach (var tuple in GetAllProperties(t.BaseType)) + yield return tuple; + } + } +} diff --git a/tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/CompiledBindingExtensionTests.cs b/tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/CompiledBindingExtensionTests.cs index 555a05638b..f3f2d2f1e4 100644 --- a/tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/CompiledBindingExtensionTests.cs +++ b/tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/CompiledBindingExtensionTests.cs @@ -17,6 +17,7 @@ using Avalonia.Markup.Xaml.Templates; using Avalonia.Media; using Avalonia.Metadata; using Avalonia.UnitTests; +using JetBrains.Annotations; using XamlX; using Xunit; @@ -1527,7 +1528,7 @@ namespace Avalonia.Markup.Xaml.UnitTests.MarkupExtensions [TemplateContent] public object Content { get; set; } - public bool Match(object data) => FancyDataType.IsInstanceOfType(data); + public bool Match(object data) => FancyDataType?.IsInstanceOfType(data) ?? true; public IControl Build(object data) => TemplateContent.Load(Content)?.Control; } diff --git a/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/DataTemplateTests.cs b/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/DataTemplateTests.cs index abbcf6c5a8..e005964ad0 100644 --- a/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/DataTemplateTests.cs +++ b/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/DataTemplateTests.cs @@ -1,6 +1,11 @@ using System; +using System.Linq; using Avalonia.Controls; using Avalonia.Controls.Presenters; +using Avalonia.Controls.Templates; +using Avalonia.Markup.Xaml.Templates; +using Avalonia.Markup.Xaml.UnitTests.MarkupExtensions; +using Avalonia.Metadata; using Avalonia.UnitTests; using Xunit; @@ -90,6 +95,93 @@ namespace Avalonia.Markup.Xaml.UnitTests.Xaml } } + [Fact] + public void XDataType_Should_Be_Assigned_To_Clr_Property() + { + using (UnitTestApplication.Start(TestServices.StyledWindow)) + { + var xaml = @" + + + + + + + +"; + var window = (Window)AvaloniaRuntimeXamlLoader.Load(xaml); + var target = window.FindControl("target"); + var template = (DataTemplate)window.DataTemplates.First(); + + window.ApplyTemplate(); + target.ApplyTemplate(); + ((ContentPresenter)target.Presenter).UpdateChild(); + + Assert.Equal(typeof(string), template.DataType); + Assert.IsType(target.Presenter.Child); + } + } + + [Fact] + public void XDataType_Should_Be_Ignored_If_DataType_Already_Set() + { + using (UnitTestApplication.Start(TestServices.StyledWindow)) + { + var xaml = @" + + + + + + + +"; + var window = (Window)AvaloniaRuntimeXamlLoader.Load(xaml); + var target = window.FindControl("target"); + + window.ApplyTemplate(); + target.ApplyTemplate(); + ((ContentPresenter)target.Presenter).UpdateChild(); + + Assert.IsType(target.Presenter.Child); + } + } + + [Fact] + public void XDataType_Should_Be_Ignored_If_DataType_Has_Non_Standard_Name() + { + // We don't want DataType to be mapped to FancyDataType, avoid possible confusion. + using (UnitTestApplication.Start(TestServices.StyledWindow)) + { + var xaml = @" + + + + + + + + +"; + var window = (Window)AvaloniaRuntimeXamlLoader.Load(xaml); + var target = window.FindControl("target"); + + window.ApplyTemplate(); + target.ApplyTemplate(); + ((ContentPresenter)target.Presenter).UpdateChild(); + + var dataTemplate = (CustomDataTemplate)target.ContentTemplate; + Assert.Null(dataTemplate.FancyDataType); + } + } + [Fact] public void Can_Set_DataContext_In_DataTemplate() { diff --git a/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/TreeDataTemplateTests.cs b/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/TreeDataTemplateTests.cs index 807b37517a..81e94bde4f 100644 --- a/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/TreeDataTemplateTests.cs +++ b/tests/Avalonia.Markup.Xaml.UnitTests/Xaml/TreeDataTemplateTests.cs @@ -21,5 +21,22 @@ namespace Avalonia.Markup.Xaml.UnitTests.Xaml Assert.IsType(template.ItemsSource); } } + + [Fact] + public void XDataType_Should_Be_Assigned_To_Clr_Property() + { + using (UnitTestApplication.Start(TestServices.MockPlatformWrapper)) + { + var xaml = @" + + +"; + var templates = (DataTemplates)AvaloniaRuntimeXamlLoader.Load(xaml); + var template = (TreeDataTemplate)(templates.First()); + + Assert.Equal(typeof(string), template.DataType); + } + } } }