Re: PlotIconRefInContext doesn't work

FROM : Michael Babin
DATE : Sat May 17 17:29:37 2008

On May 17, 2008, at 10:06 AM, Michael Vannorsdel wrote:

> I'm thinking the window might be redrawing itself right after your 
> own drawing and erasing it.  You could try disabling the window's 
> auto displaying and flush the window buffer after your draw to 
> determine if this is the case.
>
> I don't know where you're doing the drawing to know if it's safe 
> from being erased or not.
>
>
> On May 17, 2008, at 12:37 AM, Mike wrote:
>

>> It's a local NSRect which I assume is interchangeable with CGRect 
>> as they are the same.
>>
>> I fill in the rect at the top of the method with the Rect of the 
>> item in the window from IB and then I hide the item before drawing 
>> to prevent my stuff from being drawn over.
>>
>> CGContextFillRect doesn't do anything either. Just a blank space as 
>> with PlotIconRefInContext.


If that were indeed the problem (some other drawing taking place after 
his own and erasing it), an easier way to check for it would be to use 
Quartz Debug, turn on "Autoflush drawing", set a breakpoint at the 
CGContextFillRect call, and step over it to see if the rect is indeed 
filled as expected.