IXamlType EmitTypeDescriptorContextStub(IXamlTypeSystem typeSystem, IXamlTypeBuilder <IXamlILEmitter> builder,
XamlLanguageTypeMappings mappings)
{
if (mappings.TypeDescriptorContext == null)
{
return(null);
}
var tdc = mappings.TypeDescriptorContext;
var tdcPrefix = tdc.Namespace + "." + tdc.Name + ".";
builder.AddInterfaceImplementation(mappings.TypeDescriptorContext);
void PropertyStub(string name) => ImplementInterfacePropertyGetter(builder, tdc, name).Generator.Ldnull().Ret();
PropertyStub("Container");
PropertyStub("Instance");
PropertyStub("PropertyDescriptor");
void MethodStub(string name)
{
var original = tdc.FindMethod(m => m.Name == name);
builder.DefineMethod(original.ReturnType, original.Parameters, tdcPrefix + name,
false, false, true,
original)
.Generator
.Emit(OpCodes.Newobj,
typeSystem.FindType("System.NotSupportedException").FindConstructor(new List <IXamlType>()))
.Emit(OpCodes.Throw);
}
MethodStub("OnComponentChanging");
MethodStub("OnComponentChanged");
return(mappings.TypeDescriptorContext);
}
public static IXamlType GetType(this IXamlTypeSystem sys, string type)
{
var f = sys.FindType(type);
if (f == null)
{
throw new XamlTypeSystemException("Unable to resolve type " + type);
}
return(f);
}
private static void EmitNameScopeField(XamlLanguageTypeMappings mappings,
IXamlTypeSystem typeSystem,
IXamlTypeBuilder <IXamlILEmitter> typebuilder, IXamlILEmitter constructor)
{
var nameScopeType = typeSystem.FindType("Avalonia.Controls.INameScope");
var field = typebuilder.DefineField(nameScopeType,
ContextNameScopeFieldName, true, false);
constructor
.Ldarg_0()
.Ldarg(1)
.Ldtype(nameScopeType)
.EmitCall(mappings.ServiceProvider.GetMethod(new FindMethodMethodSignature("GetService",
typeSystem.FindType("System.Object"), typeSystem.FindType("System.Type"))))
.Stfld(field);
}