Custom View drawn twice?

FROM : Ben Lachman
DATE : Thu Feb 21 07:23:03 2008

I have a text view that contains a custom view which in turn contains 
an imageview and draws an image and a drop shadow.  During selection 
the bits of the view which are not fully opaque (the shadow and the 
image) sometimes draw twice, producing a darker shadow than I want. 
This seems to alternate with normal looking drawing, so when I select 
text the shadow flickers between regular and darker along with the 
other non-opaque bits in the image.  My method for drawing the shadow 
looks like this:

- (void)drawRect:(NSRect)rect {
   NSAffineTransform *xform = [NSAffineTransform transform];

   [NSGraphicsContext saveGraphicsState];

   [xform translateXBy:imageViewOrigin.x yBy:imageViewOrigin.y];
   [xform rotateByDegrees:rotation];
   [xform concat];

   NSShadow *imageShadow = [[NSShadow alloc] init];
   [imageShadow setShadowOffset:NSMakeSize(0,-5)];
   [imageShadow setShadowBlurRadius:5];
   [imageShadow setShadowColor:[NSColor blackColor]];
   
   [imageShadow set];
   [[NSColor whiteColor] set];
   [NSBezierPath fillRect:[imageView bounds]];
   [NSGraphicsContext restoreGraphicsState];
   
   [imageShadow release];    
}

I should note that the selection area does not overlap the view 
(custom shaped text container).  Anyone have any ideas as to what 
might be going wrong?

->Ben

--
Ben Lachman
Acacia Tree Software

http://acaciatreesoftware.com

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740.590.0009