10.10.4
I want to zoom (width only) my NSView and want the mid-point of the view to be
still in the mid after zooming.
The following code works - but only if zooming slowly.
How can one avoid the performSelector:afterDelay ?
Is there some notification like NSLayoutHasBeenDoneNotification ?
I tried NSViewFrameDidChangeNotification, but this is called much too often.
-(void)setZoomValue: (double)new
{
_zoomValue = new;
self.requiredWidth = …
double position = …
[ self invalidateIntrinsicContentSize ];
[ self performSelector: @selector(scrollPosition:) withObject:
@(position) afterDelay: 0.1 ]; // 0.0 no good
}
- (NSSize)intrinsicContentSize
{
return NSMakeSize( self.requiredWidth, NSViewNoInstrinsicMetric );
}
- (void) scrollPosition: (NSNumber *)n
{
[ self scrollPoint: NSMakePoint(n.doubleValue,0) ];
}
Gerriet.
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