Re: NSAmimatablePropertyContainer property animation troubles...

• Subject: Re: NSAmimatablePropertyContainer property animation troubles...
• From: Troy Stephens <email@hidden>
• Date: Thu, 1 Nov 2007 15:22:18 -0700
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Hi Troy,

Thanks for the reply.

What got me looking was I first tried to use an NSNumber for a property I wanted to animate. When it didn't work i started searching and landed on the release notes which show color.

Spent some more time poking around with the code and found that if I switched my initial property to a float it worked. So I tried the color example from the release notes and found it did not work either. And thus the post...

So it seems that if I were to subclass basic animation I could animate color changes. Is that the eventual goal, the API sure looks that way even if the docs and particulars are lacking. My real goal is to be able to provide an animation for arbitrary properties. Not because any app in particular needs it but just because it looks like it should be possible and I want to write up an example of doing that.

Troy

On Thursday, November 01, 2007, at 03:05PM, "Troy Stephens" <email@hidden > wrote:

Hi Bill,

Animation of NSColor properties isn't supported yet; that's why your
code isn't being asked to provide an animation to use.

As an alternative, you could drive a float or double typed property
using an animation, and vary the color you use in response to changes
in that property.

Troy

On Nov 1, 2007, at 1:41 PM, Bill Dudney wrote:

The release notes on NSAmimatablePropertyContainer protocol give an
example like this;

@implementation MyView
+ (id)defaultAnimationForKey:(NSString *)key {
  if ([key isEqualToString:@"borderColor"]) {
      // By default, animate border color changes with simple
linear interpolation to the new color value.
      return [CABasicAnimation animation];
  } else {
      // Defer to super's implementation for any keys we don't
specifically handle.
      return [super defaultAnimationForKeyKey:key];
  }
}
@end

But I don't see the search for animations being performed on
properties that are not part of the primitives (double, float,
NSPoint, NSSize or NSRect). I have two properties on my NSView one
is float and does get animated, the other is an NSColor and the
defaultAnimationForKey: never gets called for this property.

Anyone else had a chance to mess with this api yet and seen the same
thing?

Thanks,

-bd-
http://bill.dudney.net/roller/objc
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