Re: drawRect: called twice for NSView subclass.

FROM : William Hunt
DATE : Sun Apr 20 22:49:01 2008

On Apr 19, 2008, at 6:28 PM, Scott Thompson wrote:
>
> On Apr 19, 2008, at 7:15 PM, William Hunt wrote:

>> Essentially I have a window with a custom view atop a button.  What 
>> happens at each refresh, however, is that the custom view's 
>> drawRect: is called twice.  First it is called with the whole 
>> window's NSRect, then it is called with the "proper" NSRect.  The 
>> result is that if I draw a circle at (0,0), it gets drawn twice at 
>> different locations:
>>
>> +------------------+
>> |+----------------+|
>> ||    Custom    ||
>> ||o    View      ||
>> |+----------------+|
>> |o              == |
>> +------------------+
>>
>> What is going on here?  Is this buggy behavior or correct 
>> behavior?  My code is basically a new Cocoa application with a 
>> single NSView subclass.  There is absolutely nothing funny (that I 
>> know of) going on here.  That leads me to believe that the behavior 
>> is "correct," and that I'm just missing something.
>>
>> For the record, I only want the one call to drawRect:, the one with 
>> the "proper" NSRect.

>
> It sounds like you've somehow ended up with the content rect of the 
> window as an instance of your custom view class.
>
> How do you create your view hierarchy (i.e. in Interface Builder) or 
> "by hand"?
>
> Scott
>



Indeed, somehow the class for the content window got changed.  Of 
course, that somehow was me making the change.  Grr.

Thanks again,

Wil

--
Wil Hunt

"Life is the art of drawing sufficient conclusions from insufficient 
premises."
      -- Samuel Butler