What you can do is use the NSWindow's nextEventMatchingMask: method to determine the next event, here you can check for events that should discontinue your current processing. So, say if u want to do some processing only while mouse down, and stop if there is a mouse up while you are doing it then u can do:

- (void)mouseDown:(NSEvent *)event
{
        while ([event type] != NSLeftMouseUp )
        {
                // do processing
                // get the new event
                event = [[self window] nextEventMatchingMask:NSLeftMouseUpMask];
        }
}

-Chaitanya
On 28-Jul-08, at 11:53 AM, Scott Squires wrote:

If I handle a mouse event and am processing it in a time consuming method which includes display, what's the cleanest way to peek at events during this time (to get updated mouse info,etc ) or to allow the run loop to continue enough to make another pass?
Is there a clean way to allow the main thread to update?

I know I could create another thread for the routine but with issues of events, drawing and handling mutable arrays I thought I'd see if there was a simpler method I was overlooking.
Thanks.

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