How to make a transparent NSScroller?

Posted by aquaibm on Stack Overflow See other posts from Stack Overflow or by aquaibm
Published on 2011-02-03T06:55:49Z Indexed on 2011/02/03 15:26 UTC
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enter image description here

This is my application screenshot.There is only one NSScrollView on the window.I try to make all the scrollview elements transparent,and obviously parts of my code work, but the scroller doesn't.

Here is my draw code for custom NSScroller subclass.

- (void) drawRect: (NSRect)dirtyRect
{
    [[NSColor clearColor] set];
    NSRectFill(dirtyRect);

    [self drawKnob];
}

Does anyone have a clue to make this work? Thanks a lot.

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