Re: image opacity?
Re: image opacity?
- Subject: Re: image opacity?
- From: Michael Vannorsdel <email@hidden>
- Date: Sun, 11 May 2008 02:26:19 -0600
NSView and subclasses have a setAlphaValue: that might do what you
want. It requires a backing Core Animation layer (CALayer) and
therefore is Leopard only. You can have IB setup the layer backing by
setting the view's Wants Core Animation Layer under Effects of the
Inspector window; I think Content View is the one to enable it on.
You can do it programatically with setWantsLayer:YES as well. Then
you use the animator proxy like:
[[NSAnimationContext currentContext] setDuration:2.0]; //2 second fade
[[imageView animator] setAlphaValue:1.0f]; //fade in view to full
opacity
Alternately you can subclass the NSImageView or make your own NSView
subclass and override drawRect: to vary the drawn image's opacity. If
you're adventurous you can use Core Image to do an accelerated fade
for Tiger and up.
On May 11, 2008, at 1:03 AM, Patrick J. Collins wrote:
Does anyone happen to know how one could set the opacity of an
NSImageView object? I am looking for a way to simply fade in an image
on within my app's window-- but neither of the NSImageView nor
IKImageView list anything about opacity...
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| | >image opacity? (From: "Patrick J. Collins" <email@hidden>) |