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Getting Started with QCCompositionLayer

I'm just starting out with some of this cool Leopard stuff, but can't seem to get things working in a layer. It works OK if I put the compositionLayerWithComposition directly into the displayArea' but I have no luck getting it as a child layer. It draws the frame OK, so I can animate the layer itself, just no contents get redrawn. I'm sure there is a simple step. I have tried setting the layoutmanager stuff and needsredraw etc,

thanks.



- (void) applicationDidFinishLaunching:(NSNotification*)notification
{
QCComposition*  composition;
composition = [[QCCompositionRepository sharedCompositionRepository] compositionWithIdentifier:@"/defocus"];

QCCompositionLayer *firstLayer=[QCCompositionLayer compositionLayerWithComposition:composition];

CALayer *rootLayer = [CALayer layer];
rootLayer.layoutManager = [CAConstraintLayoutManager layoutManager];
rootLayer.borderWidth=5.0;
rootLayer.cornerRadius=25;
[rootLayer addSublayer:firstLayer];

[displayArea setLayer:rootLayer];
[displayArea setWantsLayer:YES];
}

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