Re: Solved: widgets don't work properly in a bordrless window?!?

FROM : Clark S. Cox III
DATE : Wed Nov 20 20:46:41 2002

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On Wednesday, Nov 20, 2002, at 08:54 US/Eastern, Ondra Cada wrote:

> On Wednesday, Nov 20, 2002, at 12:23 Europe/Prague, Marco Binder wrote:
>
>> Ondra, I m not sure on this one, but the docs say:
>>
>> - (BOOL)canBecomeKeyWindow
>>
>> Returns YES if the receiver can become the key window, NO if it
>> can't. Attempts to make the receiver the key window are abandoned if
>> this method returns NO. NSWindow's implementation returns YES if the
>> receiver has a title bar or a resize bar, NO otherwise.
>>
>> So I'd guess, it returns NO for a borderless window. If I d take a
>> shot on this one, I d say you ll have to make it return YES.
>
> Right. I'm pretty dumb not to consider this myself -- just tested, it
> works like a charm. Thanks!
>
>> And here is my question for you: is it possible to use a category to
>> override a function? Or do you have to subclass NSWindow?
>
> Just to make this clear:
>
> - you can override any method using a category (including this one);
> - there's a catch though: if the method itself came from another
> category (or if more categories override the same method, which is
> more or less the same), the selection of the method which will be used
> to respond to the appropriate message is essentially random (matter of
> fact, it's the one of the category loaded last);
> - there's another catch: using a category, you change a behaviour of
> the class itself, ie. of *all* windows in the application. Often it's
> what you want, but generally you might consider subclassing just to be
> able to choose those instances which should have the new behaviour.

   Another reason to prefer subclassing: There is no way to call the
original method from a category (i.e. the equivalent of [super
someMethod]), it is effectively lost.


- --
http://homepage.mac.com/clarkcox3/
<email_removed>
Clark S. Cox, III
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