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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