Le mercredi 27 juillet 2011 11:39:17, Richard Didier a écrit :
> Le mardi 26 juillet 2011 11:52:10, Andreas Hocevar a écrit :
> > Hi Richard,
>
> Hi Andreas,
>
> > Also, please let me know if you're able to override constructors in 2.11
> > with this approach:
> >
> > var A = OpenLayers.Class({...});
> > var B = OpenLayers.Class(A, {...});
> >
> > OverloadB = {
> >
> > initialize: function() {...},
> > customMethod: function() {...},
> > customProperty: "foo"
> >
> > };
> > var BTemp = OverloadB.initialize;
> > BTemp.prototpye = B.prototype;
> > OpenLayers.Util.extend(BTemp.prototype, OverloadB);
> > B = BTemp;
>
> Based on this, I have modified and tested overloading in both OL 2.10 and
> OL 2.11 and its works for both ! The final code looks like (sure it can be
> improved) :
>
>
> /**
> * Function: OpenLayers.overload
> * Apply the patch to the given class and propagate it downward
> * to the sub-classes by insuring that only not overwritten
> * methods() or properties are overloaded.
> *
> * Parameters:
> * P - {Object} an instance of {<OpenLayers.Class>}
> * F - {Object} an object used to overwrite methods (including
> * constructor) and properties of P and its sub-classes.
> *
> * Returns:
> * {Object} the overloaded instance of given {<OpenLayers.Class>}
> */
> OpenLayers.overload= function(P,F) {
> ...
> };
>
>
> Many thanks for your help.
>
I wa a bit too enthusiast on this !(
The fact is that with OL 2.11 an important part of the information seems to be
lost when digging into the class
hierarchy with Firebug :
A= OpenLayers.Class(...);
A.B= OpenLayers.Class(A, ...);
In the end, one has :
A
B
prototype
initialize
B
When I applied my OpenLayers.overload method, I lost the second B in the
initialize function() ... Although I still
have B has an instanceof A, if I applied again the overload method, it does
work anymore ...
Reading the code (and to my understanding of this), it seems that the
constructor does not "link" properly the B
class with the A class when overriding the B class ...
Any thought ?
Regards,
didier
> > Andreas.
--
RICHARD Didier - Chef du pôle technique du Géoportail
2/4, avenue Pasteur - 94165 Saint Mandé Cedex
Tél : +33 (0) 1 43 98 83 23
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