QItemEditorFactory and QStyledDelegate

Hi guys.
I have one question about QTableView and Model/View Programming...Is it right that the method createEditor of QStyledDelegate does nothing, if I set a default factory for each datatype in the view?

Code:

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QItemEditorFactory::setDefaultFactory(factory);

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And is it right that QItemEditorFactory is just a smarter attempt of creating different editors for types, than having a couple of if-condition in QStyledDelegate::createEditor for each type?

thanks

No ideas? :(
I don't understand the sense of QItemEditorFactory, if I have a custom QStyledItemDelegate with implemented method createEditor...

http://www.qtcentre.org/threads/1036...d-custom-Model

this thread explains it a bit, but I would be very happy, if someone can share a bright explanation...