Looks like a Decorator Pattern.
Danny Kodicek wrote:
> Thanks a lot for all the replies. Most helpful. It's a funny
situation. I'm using a deserialised XML file to dictate the
content and layout of each page. A page might contain 1. A
heading, 2. A TextField 3. A link or it might contain 1.A
heading 2. A thumbnailMenu or various other permutations.
I have written a class for each item that implements an IItem
interface, and they all have certain identical methods
(setPosition(), setScheme(), close() etc), but they also have
unique props that need to be set (The label of the header,
the label / path of a link etc.) Also to comlicate things, if
the item is a menu, I need to attach an eventListener.
I like the idea of using classes to encapsulate the
parameters, but where would these be created? I guess it
would make sense to do it at deserialisation, but then that
gives two places that will be subject to change and that is a
bad thing. I could do it in a separate method in the factory
I suppose.
This sounds like what I'm doing at the moment. What I did was instead of
using an interface, to make all my elements inherit the same base Element
class, then when running a createElement function, I simply defined it as
returning an instance of Element. It sounds to me like you're giving in to a
common problem of letting the OO cart pull the design horse - you're trying
to force a function to be strongly typed when by design it's creating
elements of different types.
Danny
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