Dietrich Streifert schrieb:
>
>
> Sebastian Werner schrieb:
>> Dietrich Streifert schrieb:
>>
>>> Fabian Jakobs schrieb:
>>>
>>>> Dietrich Streifert schrieb:
>>>>
>>>>
>>>>> Thank you Jim.
>>>>>
>>>>> That sounds promising. I also used to extend qx.ui.core.Widget with my
>>>>> own set of properties by using the qx.Proto = ..classname.. syntax.
>>>>>
>>>>> One more question left ;-)
>>>>>
>>>>> Is it possible to "overwrite" or redeclare a method of a class by
>>>>> using mixins? If yes: do I have access to the original method of the
>>>>> class?
>>>>> Something like:
>>>>>
>>>>> theMethod: function(arg) {
>>>>> doSomethingWithArg(arg);
>>>>> hookToOldMethod.theMethod(arg);
>>>>> }
>>>>>
>>>>>
>>>>> The typical usage would be to add some code to the method and then
>>>>> call the original method.
>>>>>
>>>>>
>>>> Now it's getting dirty ;-) You can overwrite existing methods but there
>>>> is no way to access the original implementation once it is overwritten.
>>>> We have no supported way to do this using mixins. You can however always
>>>> hack the prototype of an existing class and achieve this.
>>>>
>>>>
>>>>
>>> Why is this dirty? There is no real protection in javascript (as it
>>> exists in eg. java) against replacing attributes, methods or classes. If
>>> the language allows this, the developers will do it.
>>>
>>
>> It's not dirty regarding the implementation. It's dirty regarding other
>> things. Maybe stability etc.
>>
>> Overwrite an existing function - even to extend them - means that you
>> change the behavior to something which was not planned by the original
>> author and this could break code which relies on exactly the old behavior.
>>
>> Generally one could say that using "patch" removes the responsibility
>> from the original author and moves it to the modifier. I think in the
>> most cases it should be possible to live without patching existing
>> function. I really think that everyboding using patch should separate
>> the stuff which don't need "patch" and use "include" for these.
>>
>>
>>> So having an interface for doing this "dirty things" in a consistent and
>>> documented way, will lead to code which is more readable by others and
>>> is parseable by the qooxdoo generator which will allow migration pathes.
>>>
>>
>> This is the reason why qooxdoo 0.7 will have such an interface :)
>>
>>
>
> Thank you for the patch mixin implementation.
>
> Anyhow one thing is missing in the patch implementation (as Fabian
> said): The possibility to get access to the original method. So when a
> mixin re-implements a method, the old method should still be accessible
> from within the new method implementation. If a mixin patches the method
> doFoo we should be able to write:
>
> function doFoo(bar) {
> return this.__patch__orignalDoFoo.call(this,bar);
> }
>
> where this.__patch__originalDoFoo contains the original method.
>
> Is this possible? Do you plan to implement this functionality?
Nothing to implement here I think. You can easily access the prototype
method of the original:
return qx.original.class.prototype.doFoo.call(this, bar);
>
> BTW: The new OO interface is GREAT.
Thanks. We like it too ;)
Sebastian
>
>> Sebastian
>>
>>
>>>> Best Fabian
>>>>
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>>>>
>>> --
>>> Mit freundlichen Grüßen
>>> Dietrich Streifert
>>> --
>>> Visionet GmbH
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>>
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>
> --
> Mit freundlichen Grüßen
> Dietrich Streifert
> --
> Visionet GmbH
> Firmensitz: Am Weichselgarten 7, 91058 Erlangen
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