Re: Point Conversion Between Coordinate Spaces. Working with NSControl and NSCell. Quick Question
Re: Point Conversion Between Coordinate Spaces. Working with NSControl and NSCell. Quick Question
- Subject: Re: Point Conversion Between Coordinate Spaces. Working with NSControl and NSCell. Quick Question
- From: Jack Carbaugh <email@hidden>
- Date: Wed, 12 May 2010 01:07:04 -0400
i too get hung up (and still am to some degree) on converting points etc ... is there an easy guide for this ?
On May 12, 2010, at 1:01 AM, Graham Cox wrote:
>
> On 12/05/2010, at 2:51 PM, aaron smith wrote:
>
>> To me the first "localPoint = ..." should be the correct way to
>> convert the windowPoint to the control views' coordinate space. But
>> it's never right.
>>
>> Any ideas?
>
>> localPoint = [[self controlView] convertPoint:windowPoint toView:nil];
>
>
> You're working way too hard. Also, your first localPoint= is exactly the wrong way around. It should be:
>
>
> NSPoint localPoint = [controlView convertPoint:[event locationInWindow] fromView:nil];
>
> that should be all you need to do. As I understand it, a cell's -controlView method might not return the control view reliably, so you are better off using the view passed to the method as a parameter.
>
> All that convertScreenToBase stuff you're doing is superfluous AFAICS.
>
> --Graham
>
>
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