KOTH
Released
proper class-based fps
Utils/ChangeAttribute.cs
Attribute class used by a code generator to wrap property setters and call a named callback when the property value changes. It locates the attributed property, compares old and new values, sets the new value, and invokes the specified method with (oldValue, newValue).
namespace KOTH;
[CodeGenerator(CodeGeneratorFlags.Instance | CodeGeneratorFlags.WrapPropertySet, "KOTH.ChangeAttribute.OnPropertySet", 10)]
public class ChangeAttribute : Attribute
{
public string Callback { get; set; }
public ChangeAttribute(string callbackName)
{
Callback = callbackName;
}
internal static void OnPropertySet<T>(WrappedPropertySet<T> p)
{
var attribute = p.Attributes.OfType<ChangeAttribute>().FirstOrDefault();
var type = TypeLibrary.GetType(p.TypeName);
var method = type.GetMethod(attribute.Callback);
var property = TypeLibrary.GetMemberByIdent(p.MemberIdent) as PropertyDescription;
var oldValue = property.GetValue(p.Object);
var isTheSame = p.Value.Equals(oldValue);
p.Setter(p.Value);
if (isTheSame)
return;
try
{
method.Invoke(p.Object, new[] { oldValue, p.Value });
}
catch (Exception e)
{
Log.Error(e);
}
}
}