Re: Simple Semi-Transparent View?

FROM : John C. Randolph
DATE : Fri Nov 22 20:46:37 2002

On Friday, November 22, 2002, at 01:53 AM, Steve wrote:

> I'm trying to create a colored semi-transparent square area within a
> window.
> I'm creating a custom view, and  then NSRectFill-ing the entire box
> with a color whose opacity is set to 0.5,
> in the hope that I can get the default gray/white lines of the window
> to show through.
> I thought the problem might be that the window beneath (i.e. the
> superview) is not opaque.
> If this is the problem, it seems I have to subclass the window just so
> I can override the isOpaque method.
>
> Or is there just a much better way to achieve the desired result?
>
> I know that NSBox  can give you a light-gray semi-transparent box,
> and,  I can replace the contents with a solid color. But obviously,
> neither of these give me custom-color semi-transparency.

See NSRectFillUsingOperation() in the AppKit functions documentation.

I used this function in the Tinted Image example, available at:

http://developer.apple.com/samplecode/Sample_Code/Cocoa/Tinted_Image.htm

-jcr


John C. Randolph    <<email_removed>>  (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html
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