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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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