Re: Transparency?
Re: Transparency?
- Subject: Re: Transparency?
- From: Nicko van Someren <email@hidden>
- Date: Wed, 21 Apr 2004 17:00:09 +0100
Have you remembered to override -(BOOL)isOpaque in the NSBox subclass?
The default version returns YES but if you want anything behind your
view to be drawn reliably you'll need to override it to return NO so
that items lower down in the stack of views (such as the window
background) get drawn.
Nicko
On 21 Apr 2004, at 16:27, Huyler, Christopher M wrote:
At this point, nothing is in the NSBox. If I remove the NSRectFill
call, I end up with an invisible box.
I just tried the following which also didn't work. The color of the box
is still gray instead of being completely white.
[[NSColor whiteColor] set];
NSRecFill(rect);
[[NSColor colorWithCalibratedWhite:1.0 alpha:0.2] set];
NSRectFill(rect);
Installer uses a Custom View so everything appears to be programmatic.
-----Original Message-----
From: Nicko van Someren [mailto:email@hidden]
Sent: Wednesday, April 21, 2004 11:01 AM
To: Huyler, Christopher M
Cc: J Nozzi; email@hidden
Subject: Re: Transparency?
You are right that alpha of 1.0 is opaque and 0.0 is transparent.
What's in the content view of the NSBox? Also, what happens if you
remove the NSRectFill call? If the content is black then you'd get the
behaviour you are seeing.
Nicko
On 21 Apr 2004, at 15:32, Huyler, Christopher M wrote:
When I lower the alpha number, the rectangle gets darker. An alpha
value of 0.0 (which should be completely transparent right?) comes out
as a black square.
-----Original Message-----
From: J Nozzi [mailto:email@hidden]
Sent: Wednesday, April 21, 2004 10:26 AM
To: Huyler, Christopher M
Subject: Re: Transparency?
Try a lower alpha. Like 0.5 ... Your screen may not be calibrated
correctly (or close enough) to actually show any transparency with
such
a slight transparency setting. The lower the alpha number, the more
transparency.
- J
On Apr 21, 2004, at 10:19 AM, Huyler, Christopher M wrote:
The Installer.app program has a cool looking transparency effect
where
it has a slightly transparent white box, then the background image,
then
finally the striped background of the window. How do I do this in
cocoa?
I started by sub-classing an NSBox and rewriting the drawRect
function:
- (void) drawRect:(NSRect) frame
{
NSRect rect=[self frame];
[super drawRect:frame];
rect.origin=NSMakePoint(1,1);
rect.size.width-=2;
rect.size.height-=2;
[[NSColor colorWithCalibratedWhite:1.0 alpha:0.9] set ];
NSRectFill(rect);
}
However, the box does not end up being transparent. Instead it is
just
off-white. Can someone point me in the right direction?
--
Christopher Huyler
Computer Associates Intl.
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