Rob makes a good point here. In general, it's a bad idea to overwrite your check to allow more values in the child class, because the parent class may not be able to deal with those new values.
Allowing less values is pretty much ok, though, because the parent class will be able to handle all values that the child class can handle (and more). Although there are still many scenario's that can be thought of, in which this will go wrong. Regards, Marc On 05/16/2011 11:23 AM, Robert Nimax wrote: > Hi, > I do not think, you can do it. Even the"refine" key of a property will > only affect the initial value. > You should really think about your class design. If there is a > property of another type in the sub class you should give it another > name, because it is a different property and the semantics are different. > Furhtermore if you´d change the type of a property in a subclass how > can you be shure that there will be no problem if the base class uses > this property ? > HTH, > Rob. > > >>> benco <[email protected]> 5/16/2011 10:36 >>> > Hello, > > I'm currently trying to subclass an existing class and to overwrite an > existing property to allow more possibilities. The "check" function of > this > property is a problem because I can't redefine it in the subclass. > > As it is impossible to completely and easily overwrite properties with qx > class definitions, I was wondering how I could achieve doing it... > > By using a Mixin ? Via the "include" directive or by using a "patch" ? (I > don't know if the include declaration in class definitions triggers also > patching when there are existing methods). I tried these two ways but > without success (the same check error occurs again). > > Any ideas ? > > Best, > > Benoît. > > > -- > View this message in context: > http://qooxdoo.678.n2.nabble.com/the-best-way-for-properties-real-overwritting-tp6367889p6367889.html > Sent from the qooxdoo mailing list archive at Nabble.com. > > ------------------------------------------------------------------------------ > Achieve unprecedented app performance and reliability > What every C/C++ and Fortran developer should know. > Learn how Intel has extended the reach of its next-generation tools > to help boost performance applications - inlcuding clusters. > http://p.sf.net/sfu/intel-dev2devmay > _______________________________________________ > qooxdoo-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/qooxdoo-devel > > > ------------------------------------------------------------------------------ > Achieve unprecedented app performance and reliability > What every C/C++ and Fortran developer should know. > Learn how Intel has extended the reach of its next-generation tools > to help boost performance applications - inlcuding clusters. > http://p.sf.net/sfu/intel-dev2devmay > > > _______________________________________________ > qooxdoo-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/qooxdoo-devel ------------------------------------------------------------------------------ Achieve unprecedented app performance and reliability What every C/C++ and Fortran developer should know. Learn how Intel has extended the reach of its next-generation tools to help boost performance applications - inlcuding clusters. http://p.sf.net/sfu/intel-dev2devmay _______________________________________________ qooxdoo-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/qooxdoo-devel
