setFrame: not working in custom event loop

[Mike Manzano]

Hi,

I am tracking the mouse pointer to dynamically resize a splitter as a  
separate drag handle is dragged. This is done in mouseDown: of the  
drag handle with a custom event loop. The loop looks like this:

    while (keepOn)
        {
        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
        theEvent = [[self window] nextEventMatchingMask:  
NSAnyEventMask] ;// NSLeftMouseUpMask | NSLeftMouseDraggedMask];
                
        switch ([theEvent type])
                {
                        case NSLeftMouseUp:
                                keepOn = NO;
                                break;
                                
                        case NSLeftMouseDragged:
				[nc postNotificationName:NSSplitViewWillResizeSubviewsNotification  
object:splitView];
                                firstFrame = [[[splitView subviews] 
objectAtIndex:0] frame];
                                firstFrame.size.width = (isLeftResizer ?
										 MAX(0,roundf(([splitViewconvertPoint:[theEvent  
locationInWindow] fromView:nil].x + offset) - firstFrame.origin.x)) :
										 MAX(0,roundf([splitViewconvertPoint:[theEvent  
locationInWindow] fromView:nil].x - [splitViewdividerThickness] -  
offset)));

                                firstFrame.size.width = 
MIN(MAX(firstFrame.size.width,min),max);

                                NSLog( @"SetFrame: %@" , 
NSStringFromRect(firstFrame) ) ;
                                [[[splitView subviews] objectAtIndex:0] 
setFrame:firstFrame];
				NSLog( @"\tIs Now: %@" , NSStringFromRect([[[splitView subviews]  
objectAtIndex:0] frame]) ) ;

                                [splitView adjustSubviews];
				[nc postNotificationName:NSSplitViewDidResizeSubviewsNotification  
object:splitView];
                                break;
                        default:
                                break;
                }
        [pool release] ;
        }
        
	NSLog( @"Finally: %@" , NSStringFromRect([[[splitView subviews]  
objectAtIndex:0] frame]) ) ;


(you might recognize this is as the Scrivener custom split view code  
available on the web)

Anyway, the visual updates to the screen seem to start lagging the  
further right I drag the handle. You can see the NSLog()s I have in  
the code; here is the output as I drag:

[...]
2009-03-10 14:37:42.428 SkootUI[8830:10b] SetFrame: {{0, 0}, {718, 604}}
2009-03-10 14:37:42.444 SkootUI[8830:10b]       Is Now: {{0, 0}, {718, 604}}
2009-03-10 14:37:42.511 SkootUI[8830:10b] SetFrame: {{0, 0}, {721, 604}}
2009-03-10 14:37:42.539 SkootUI[8830:10b]       Is Now: {{0, 0}, {721, 604}}
2009-03-10 14:37:42.596 SkootUI[8830:10b] SetFrame: {{0, 0}, {723, 604}}
2009-03-10 14:37:42.600 SkootUI[8830:10b]       Is Now: {{0, 0}, {723, 604}}
2009-03-10 14:37:44.101 SkootUI[8830:10b] Finally: {{0, 0}, {684, 604}}

As you can see, as far as the view being resized is concerned, it is  
being set to what I set it to as I drag the handle; i.e., the  
"SetFrame:" dimensions match the "Is Now:" dimensions. During this  
time, however, I can see the view sizing visually lag. When the drag  
finishes and the "Finally" block prints out, querying the view for its  
frame displays what I believe to be the actual lagged dimensions.

Can anyone tell me what's going on?

Thanks,

Mike
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