On 29 Jul 2008, at 12:31 pm, Dale Miller wrote:
I cannot get transparent colors to work. I have tried two cases:
1) I have a view which returns YES to "isTransparent". The log shows
the method has been called and responded YES. If I do a NSRectFill
after [[NSColor clearColor] set] the view displays as black.
-isTransparent only applies to certain controls, not to views in
general. Did you mean -isOpaque instead?
I think there is a bug that seemed to get introduced in Leopard. The
NSRectFill methods now seem to do something different from what they
did on Tiger, using a different composition mode that stops
transparency working quite right. I'm not completely sure though - I
just noticed some drawing problems in my code when I went to Leopard
and didn't investigate them - I just switched to using a different
technique.
You can avoid the problem by using NSBezierPath instead (e.g.
[NSBezierPath fillRect:])
2) If i do a "drawInRect" with the attribute
NSBackgroundColorAttributeName set to [NSColor clearColor] (or to a
color with an alpha of 0. regardless of the red/green/blue
components) the background of the text draws as black. What is it
that I don't understand?
I believe this is a known bug - transparent text backgrounds aren't
supported. You can achieve the equivalent just by rendering the text
atop the background in the usual way (i.e. no background attribute set
at all) - the only place this bug causes a problem is with editing
text using NSTextView with a transparent background. So this might be
related to your (mis)use of isTransparent?
hth,
Graham
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