Re: NSScrollView and NSTrackingArea woes
Re: NSScrollView and NSTrackingArea woes
- Subject: Re: NSScrollView and NSTrackingArea woes
- From: email@hidden
- Date: Fri, 17 Jul 2015 12:31:23 +0900
Why not just observe bounds change notifications from the clipview?
Then handle those with the update call.
Sent from my iPhone
> On Jul 17, 2015, at 10:58 AM, João Varela <email@hidden> wrote:
>
>> On Friday, July 17, 2015, Ken Thomases <email@hidden> wrote:
>>
>> On Jul 16, 2015, at 8:19 PM, João Varela <email@hidden
>> <javascript:;>> wrote:
>>>
>>> I’m passing [self bounds]. And no, I am not using NSTrackingInVisibleRect
>>
>> Why aren't you using that? That seems like the most obvious way to get
>> correct behavior. The only reason you wouldn't use it is if you were
>> adding a tracking area that was only for a portion of a view, but you say
>> you're using the view's bounds.
>
>
> Passing self.bounds it is the simpler case I am using to test this problem.
> Indeed I need to create two tracking areas that do not coincide with the
> subview's bounds.
>
> That might make the whole issue go away. (Or it might not.)
>>
>> Unfortunately it does not solve that, because I tried that option and the
> results are the same.
>
>
>> Does your implementation of -updateTrackingAreas call through to super?
>> The docs say it should. I notice that your coalescing implementation did
>> not.
>
>
> You are right. I included such call to the super at the beginning or at the
> end, and yes the same problem remains.
>
>
>>> Yes, the tracking area is incorrect and apparently I cannot invoke
>> -updateTrackingAreas myself because it apparently messes up with the
>> NSTrackingArea’s of the subviews and most likely of the clipView, etc.
>>>
>>> So I guess this problem could be solved if there were a method to tell
>> the OS that the tracking areas are invalid (and thus they need to be
>> updated). However, apparently there is none, AFAICT. Or is there?
>>
>> You can't invoke -updateTrackingAreas yourself, but there's nothing
>> preventing you from removing old tracking areas and adding new ones, as
>> appropriate, any time you like. You can put that code in a method of your
>> own which is called by -updateTrackingAreas plus any other time you want.
>
>
> Hmm, that I haven't tried. If that works you'll be my hero.
>
>>
>> Regards,
>> Ken
>
> Thanks, João
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