Initial import

1 files changed, 74 insertions, 0 deletions

diff --git a/Xamarin.Forms.Core.Design/AttributeTableBuilder.cs b/Xamarin.Forms.Core.Design/AttributeTableBuilder.cs
new file mode 100644
index 00000000..07571d4c
--- /dev/null
+++ b/Xamarin.Forms.Core.Design/AttributeTableBuilder.cs
@@ -0,0 +1,74 @@
+using System;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows.Markup;
+using Microsoft.Windows.Design;
+
+namespace Xamarin.Forms.Core.Design
+{
+	internal class AttributeTableBuilder : Microsoft.Windows.Design.Metadata.AttributeTableBuilder
+	{
+		public AttributeTableBuilder ()
+		{
+			// Turn off validation of values, which doesn't work for OnPlatform/OnIdiom
+			AddCustomAttributes (typeof (AbsoluteLayout).Assembly,
+				new XmlnsSupportsValidationAttribute ("http://xamarin.com/schemas/2014/forms", false));
+
+			// Style isn't a view, make it visible
+			AddCallback (typeof(Style), builder => builder.AddCustomAttributes(
+				new EditorBrowsableAttribute (EditorBrowsableState.Always), 
+				new System.Windows.Markup.ContentPropertyAttribute("Setters"),
+				// Since the class doesn't have a public parameterless ctor, we need to provide a converter
+				new System.ComponentModel.TypeConverterAttribute(typeof(StringConverter))));
+
+			// The Setter.Value can actually come from an <OnPlatform />, so enable it as Content.
+			AddCallback (typeof (Setter), builder => builder.AddCustomAttributes (
+				new EditorBrowsableAttribute (EditorBrowsableState.Always), 
+				new System.Windows.Markup.ContentPropertyAttribute("Value")));
+
+			// Special case for FontSize which isn't an enum.
+			var fontElements = typeof(View).Assembly.ExportedTypes.Where(t => typeof(IFontElement).IsAssignableFrom(t));
+			foreach (var fontElement in fontElements) {
+				AddCallback (fontElement, builder => builder.AddCustomAttributes (
+					"FontSize",
+					new System.ComponentModel.TypeConverterAttribute (typeof (EnumConverter<NamedSize>))));
+			}
+
+			// TODO: OnPlatform/OnIdiom
+			// These two should be proper markup extensions, to follow WPF syntax for those.
+			// That would allow us to turn on XAML validation, which otherwise fails.
+			// NOTE: the two also need to provide a non-generic, object-based T so that 
+			// the language service can find the type by its name. That class can be internal 
+			// though, since its visibility in the markup is controlled by the EditorBrowsableAttribute.
+			// Make OnPlatform/OnIdiom visible for intellisense, and set as markup extension. 
+			AddCallback (typeof (OnPlatform<>), builder => builder.AddCustomAttributes (new Attribute[] {
+				new EditorBrowsableAttribute (EditorBrowsableState.Always),
+				//new System.ComponentModel.TypeConverterAttribute(typeof(AnythingConverter)),
+				//new System.Windows.Markup.MarkupExtensionReturnTypeAttribute (),
+			}));
+			AddCallback (typeof (OnIdiom<>), builder => builder.AddCustomAttributes (new Attribute[] {
+				new EditorBrowsableAttribute (EditorBrowsableState.Always), 
+				//new System.ComponentModel.TypeConverterAttribute(typeof(AnythingConverter)),
+				//new System.Windows.Markup.MarkupExtensionReturnTypeAttribute (),
+			}));
+		}
+	}
+
+	internal class AnythingConverter : System.ComponentModel.TypeConverter
+	{
+		public override bool CanConvertFrom (ITypeDescriptorContext context, Type sourceType)
+		{
+			return true;
+		}
+
+		public override bool CanConvertTo (ITypeDescriptorContext context, Type destinationType)
+		{
+			return true;
+		}
+
+		public override bool IsValid (ITypeDescriptorContext context, object value)
+		{
+			return true;
+		}
+	}
+}
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