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Re: [css3-transitions] Adding keyframes to transitions

From: Perry Smith <pedzsan@gmail.com>
Date: Wed, 7 Apr 2010 13:20:02 -0500
Cc: Brad Kemper <brad.kemper@gmail.com>, www-style list <www-style@w3.org>
Message-Id: <45022C7E-FB3E-4146-A7D5-F8D2122A7281@gmail.com>
To: Tab Atkins Jr. <jackalmage@gmail.com>

On Apr 7, 2010, at 12:20 PM, Tab Atkins Jr. wrote:

> On Wed, Apr 7, 2010 at 10:13 AM, Brad Kemper <brad.kemper@gmail.com>  
> wrote:
>> Aside: I think if the bounce involved 'left', then it would be  
>> overridden by
>> the 'left' in the transition-property. At least, that makes the  
>> most sense
>> to me.
>
> Really?  I would think the opposite.  The reason I'd like the
> animation to override the transition is so I can express greater
> control over the transition.
>
> For example, say all I want to do is transition 'left' on an element,
> but I want it to do so by making it quickly fly from start to end, and
> then bounce slightly before settling down.  You can't express this
> with any timing function (nor will you ever be able to, since it's
> non-invertible).  Potentially, I could do this by creating an
> animation that does this, and then hooking it to a 'left' transition.
>
> To do this *properly*, of course, requires some way to refer to the
> start and end values in an animation, and do math to them.  You can't
> do that right now, but I can see it being added in the future, and
> wouldn't want to shut down the possibility of doing what I described
> above.
>
> For now, since it's not very useful to manipulate the property you're
> transitioning, I'd just recommend not doing so.  I don't think it's a
> problem right now to say "you probably don't want to do that", and
> then later make it useful to do it.

A third alternative would be an additive effect.  e.g. if you  
specified more than one animation... perhaps that is too silly.
Received on Wednesday, 7 April 2010 18:20:40 GMT

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