Sebastian Werner schrieb:
Dietrich Streifert schrieb:
Moin Sebastian,
Let's go back to the apply method:
What would be the cost of allowing the modification of the apply
attribute of properties?
This was my problem which lead to this thread.
Within a derived widget I wanted to override the apply method of the
superclass. It turned out that there was no apply method defined.
One solution would be to allow to refine "not yet defined" attributes of
a property. This would be the event and apply attribute.
Would this be possible?
This is not possible for the same reason.
OK let's see especially for the apply property attribute your arguments
against the possibility to allow refinement:
Ok, there are multiple reasons. One major argument is that type changes
would allow to switch types completely e.g. from check=String to
check=Number for example. Most people would tend to say that this is a
bad software design.
OK for the check I agree completely now. But this has nothing to do with
the refinement of the apply property.
Another, more technical reason, is that all other changes than init
values require a separate setter/getter(...) pair which means that we
need to migrate the property defitition of the parent with the
overridden settings in the derived class. For example when you change
the "check", but want to keep the "nullable" and "init" values. You also
need a far more complex check if the this class needs an own
setter/getter pair. And there is also an overhead because you need to
generate more functions.
Does having a refined apply attribute realy needs the re-creation of the
setter/getter method pair?
--
Mit freundlichen Grüßen
Dietrich Streifert
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