osx - Changing alpha of window background, not the whole window -

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so have quick question have method below sets alpha value of window depending on value slider, content of window becomes translucent , disappears window.

is there way change alpha value of window , not content view inside it?

- (ibaction)changetransparency:(id)sender {  // set window's alpha value. cause views in window redraw. [self.window setalphavalue:[sender floatvalue]];}

thanks, sami.

apple's docs gives way this. key set window's backgroundcolor's alpha desired value. must make sure set window's opaque property no (which yes default.)

e.x.

// @ point in code... [window setopaque:no];  // in changetransparency: method... nscolor *backgroundcolor = [window backgroundcolor]; backgroundcolor = [backgroundcolor colorwithalphacomponent:[sender floatvalue]];  [window setbackgroundcolor:backgroundcolor];

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