osx - What is the best way to show the content below the NSWindow? -

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here ui mock up: enter image description here

the blue background screen, , red nswindow, , build nsview? (yellow) on top of nswindow. nsview transparent, can shows live information behind red nswindow. best way implement nsview? suggestions? thanks.

***one more remarks, yellow view not need transparent, need use analysis. so, if can raw data or transfer nsimage great.

my 2 cents. let view nsimageview. can draw background clear 

- (void)drawrect:(nsrect)rect {     [[nscolor clearcolor] set];     nsrectfill(rect); }


convert whatever draw in there image using [nsbitmapimagerep initwithfocussedviewrect:]. work?


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