Re: image opacity?
Re: image opacity?
- Subject: Re: image opacity?
- From: Jim Puls <email@hidden>
- Date: Sun, 11 May 2008 12:11:46 -0700
On May 11, 2008, at 1:26 AM, Michael Vannorsdel wrote:
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...
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.
Or, for the particular case of fading in and out, you can always use
NSViewAnimation: http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSViewAnimation_Class/Reference/Reference.html
-> jp
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