[Laszlo-dev] For Review: Change 41430 Summary:Experimental traits implementation for lps-dev
P T Withington
ptw at openlaszlo.org
Thu Apr 13 07:32:33 EDT 2006
On 2006-04-12, at 19:48 EDT, John Sundman wrote:
> Very cool.
> One nit: the wiki defines a trait as follows:
> a trait is unit of behavior -- attributes, methods, events, and
> Is a handler a method, or is it a handler? Logically of course
> it's just a special case of method. But in contexts like this,
> should it say, "attributes, methods, events, handlers and subviews"?
> My comment is more about the semantics of documenting handlers than
> it is about traits, but I guess it's worth asking here.
Either handlers need to be called out separately, or we need a more
generic term for handlers and methods. Note that the most important
distinction of handlers from methods is that they cannot be
overridden in a subclass (or a trait). Handlers 'accumulate'. In
meta-object-protocol speak, their 'method combination' is 'all',
whereas the method combination for normal methods is 'most specific'.
We have a generic term for all of these things: 'properties' (that is
what ECMA calls them), but we don't have generic terms for attribute-
like properties (attributes and events) vs. method-like properties
(methods and handlers). Note also that right now events and
attributes are in the same namespace (if you have an attribute 'one'
an an event for the e attribute 'one', they will collide). We may
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