most sensible factory pattern for a component

[Sam Hough <sa...@redspr.com>]

Seems like a common requirement to customise a component by having it create
a different type of component within it. Like ListView.newItem or
IItemFactory. Is extending the component to implement such a method any
better than passing in an object that implements some factory interface? 

Passing in a factory object seems better for re-use since you can only
extend an object once... Limits what the constructor can access more but
that may be a good thing?

Guess with an interface we get to choose.
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