Allow for parsing relative points during compile time. (#7987)

* Allow for parsing relative points during compile time.

* Revert extra target framework.

src/Avalonia.Base/RelativePoint.cs

@@ -1,7 +1,8 @@
 using System;
 using System.Globalization;
-
+#if !BUILDTASK
 using Avalonia.Animation.Animators;
+#endif
 using Avalonia.Utilities;
 
 namespace Avalonia
@@ -10,7 +11,10 @@ namespace Avalonia
     /// Defines the reference point units of an <see cref="RelativePoint"/> or 
     /// <see cref="RelativeRect"/>.
     /// </summary>
-    public enum RelativeUnit
+#if !BUILDTASK
+    public
+#endif
+    enum RelativeUnit
     {
         /// <summary>
         /// The point is expressed as a fraction of the containing element's size.
@@ -26,7 +30,10 @@ namespace Avalonia
     /// <summary>
     /// Defines a point that may be defined relative to a containing element.
     /// </summary>
-    public readonly struct RelativePoint : IEquatable<RelativePoint>
+#if !BUILDTASK
+    public
+#endif
+    readonly struct RelativePoint : IEquatable<RelativePoint>
     {
         /// <summary>
         /// A point at the top left of the containing element.
@@ -49,7 +56,9 @@ namespace Avalonia
 
         static RelativePoint()
         {
+#if !BUILDTASK
             Animation.Animation.RegisterAnimator<RelativePointAnimator>(prop => typeof(RelativePoint).IsAssignableFrom(prop.PropertyType));
+#endif
         }
 
         /// <summary>

src/Avalonia.Build.Tasks/Avalonia.Build.Tasks.csproj

@@ -95,6 +95,9 @@
       <Compile Include="../Avalonia.Controls/GridLength.cs">
         <Link>Markup/%(RecursiveDir)%(FileName)%(Extension)</Link>
       </Compile>
+      <Compile Include="../Avalonia.Base/RelativePoint.cs">
+        <Link>Markup/%(RecursiveDir)%(FileName)%(Extension)</Link>
+      </Compile>
       <Compile Include="..\Avalonia.Base\Metadata\NullableAttributes.cs" Link="NullableAttributes.cs" />
       <Compile Remove="../Markup/Avalonia.Markup.Xaml.Loader\xamlil.github\**\obj\**\*.cs" />
       <Compile Remove="../Markup/Avalonia.Markup.Xaml.Loader\xamlil.github\src\XamlX\IL\SreTypeSystem.cs" />

src/Avalonia.Build.Tasks/Properties/launchSettings.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "Compile Sandbox": {
+      "commandName": "Project",
+      "executablePath": "$(SolutionDir)\\src\\Avalonia.Build.Tasks\\bin\\Debug\\net6.0\\Avalonia.Build.Tasks.exe",
+      "commandLineArgs": "$(SolutionDir)\\samples\\Sandbox\\obj\\Debug\\net6.0\\Avalonia\\original.dll $(SolutionDir)\\samples\\Sandbox\\bin\\Debug\\net6.0\\Sandbox.dll.refs $(SolutionDir)\\out.dll"
+    }
+  }
+}

src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/AvaloniaXamlIlLanguageParseIntrinsics.cs

@@ -160,6 +160,29 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions
                 return true;
             }
 
+            if (type.Equals(types.RelativePoint))
+            {
+                try
+                {
+                    var relativePoint = RelativePoint.Parse(text);
+                
+                    var relativePointTypeRef = new XamlAstClrTypeReference(node, types.RelativePoint, false);
+                    
+                    result = new XamlAstNewClrObjectNode(node, relativePointTypeRef, types.RelativePointFullConstructor, new List<IXamlAstValueNode>
+                    {
+                        new XamlConstantNode(node, types.XamlIlTypes.Double, relativePoint.Point.X),
+                        new XamlConstantNode(node, types.XamlIlTypes.Double, relativePoint.Point.Y),
+                        new XamlConstantNode(node, types.RelativeUnit, (int) relativePoint.Unit),
+                    });
+
+                    return true;
+                }
+                catch
+                {
+                    throw new XamlX.XamlLoadException($"Unable to parse \"{text}\" as a relative point", node);
+                }
+            }
+
             if (type.Equals(types.GridLength))
             {
                 try

src/Markup/Avalonia.Markup.Xaml.Loader/CompilerExtensions/Transformers/AvaloniaXamlIlWellKnownTypes.cs

@@ -71,6 +71,9 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
         public IXamlConstructor MatrixFullConstructor { get; }
         public IXamlType CornerRadius { get; }
         public IXamlConstructor CornerRadiusFullConstructor { get; }
+        public IXamlType RelativeUnit { get; }
+        public IXamlType RelativePoint { get; }
+        public IXamlConstructor RelativePointFullConstructor { get; }
         public IXamlType GridLength { get; }
         public IXamlConstructor GridLengthConstructorValueType { get; }
         public IXamlType Color { get; }
@@ -175,6 +178,10 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
             (Matrix, MatrixFullConstructor) = GetNumericTypeInfo("Avalonia.Matrix", XamlIlTypes.Double, 6);
             (CornerRadius, CornerRadiusFullConstructor) = GetNumericTypeInfo("Avalonia.CornerRadius", XamlIlTypes.Double, 4);
 
+            RelativeUnit = cfg.TypeSystem.GetType("Avalonia.RelativeUnit");
+            RelativePoint = cfg.TypeSystem.GetType("Avalonia.RelativePoint");
+            RelativePointFullConstructor = RelativePoint.GetConstructor(new List<IXamlType> { XamlIlTypes.Double, XamlIlTypes.Double, RelativeUnit });
+
             GridLength = cfg.TypeSystem.GetType("Avalonia.Controls.GridLength");
             GridLengthConstructorValueType = GridLength.GetConstructor(new List<IXamlType> { XamlIlTypes.Double, cfg.TypeSystem.GetType("Avalonia.Controls.GridUnitType") });
             Color = cfg.TypeSystem.GetType("Avalonia.Media.Color");