Re: drawRect using a Category
Re: drawRect using a Category
- Subject: Re: drawRect using a Category
- From: Peter Teeson <email@hidden>
- Date: Sat, 31 Mar 2012 21:46:52 -0400
Thanks very much for your input guys.
David:
I had carefully read the Categories and Extensions page in OBJ-C Programming Language.
And, based on the first paragraph, assumed I could add functionality to drawRect for my particular case.
Stephen:
In my app there is only the one NSMatrix instance but it's true I've no idea what other Cocoa classes
will call my drawRect. Although I do [super drawRect] after my own drawing.
Jens:
I am aware of the difference between the matrix and it's cells.
For the matrix I want to do some special drawing of the background beyond filling, including stroking the bounds.
I also need to deal with placing the cells differently than the default. I want to inset them differently.
But that's the next thing to play with.
Anyway guys thanks for your kindness and contribution to my education.
I will return to the mountain to meditate some more.
respect….
Peter
On 2012-03-31, at 10:24 AM, David Duncan wrote:
> On Mar 30, 2012, at 8:31 PM, Peter Teeson <email@hidden> wrote:
>
>> In a Document app I have an NSMatrix. I only need to override drawRect.
>> Rather than using a sub-class, which seems overkill to me,
>> I decided to try a Category instead.
>
>
> Categories don't override, they replace. As has already been noted , this means every NSMatrix instance in your app now uses your drawRect:. But it also means you can't have two instances of NSMatrix that had different drawing and you can no longer access the original implementation.
> --
> David Duncan
>
>
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