Glow around Button

How can I draw a slight white 'glow' around a button or label in 10.5 and later? I have seen some apps do it, but I am still confused how I should do this开发者_Python百科.

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See NSShadow. You'd create and set a shadow (saving your graphics context beforehand), then draw the basic shape of your button, unset it (by restoring your graphics context), then continue drawing as usual.

In the case of a ready-made control like NSButton, you will need to subclass and override its cell drawing (and possibly make the host NSButton control itself a bit larger to accommodate the larger area needed to encompass the "glow" of the cell).

You might be able to avoid this with a label by setting its font shadow, but I don't think IB lets you do this, so you'd programmatically give the label an attributed string (via its -setAttributedString: method). The attributes would include the NSShadow (configured as desired) as the NSShadowAttributeName.