Re: Drawing from secondary thread erases resize corner in window?

FROM : Nate Weaver
DATE : Thu Feb 28 22:31:48 2008

On Feb 28, 2008, at 3:18 PM, Hank Heijink wrote:

>
> On Feb 28, 2008, at 2:56 PM, Nate Weaver wrote:
>

>>> Interesting... I hadn't thought of that. Don't I have to add 
>>> another timer to the NSDefaultRunLoopMode though? If I have to 
>>> chose between having two timers on the main thread that alternate, 
>>> or one on a secondary thread, I think I'll go with the extra thread.

>>
>> I don't believe so; I've used it in an app of my own with a single 
>> timer to avoid the same issue you're having, with no apparent ill 
>> effects.

>
>
> That's not my experience. If I just add a timer for the 
> NSEventTrackingRunLoopMode, the only time that timer fires is when 
> the run loop is in event tracking mode, which is what I would 
> expect. In the NSDefaultRunLoopMode, that timer doesn't fire at all. 
> Are you doing something somewhere else to make this happen, or am I 
> missing something?



How did you create the timer? Via +scheduledTimerWithTimeInterval:... 
or +timerWithTimeInterval:... ? If you use the latter, you'll have to 
add it to NSDefaultRunLoopMode yourself. I just do something like:

myTimer = [[NSTimer scheduledTimerWithTimeInterval:1.0 target:self 
selector:@selector(doTimerStuff:) userInfo:nil repeats:YES] retain];
[[NSRunLoop mainRunLoop] myTimer forMode:NSEventTrackingRunLoopMode];

and it works during both modes (the retain there probably isn't 
necessary in the general case, either).