- From: Tab Atkins Jr. <jackalmage@gmail.com>
- Date: Mon, 22 Jun 2015 14:02:22 -0700
- To: François REMY <francois.remy.dev@outlook.com>
- Cc: Shane Stephens <shans@google.com>, Greg Whitworth <gwhit@microsoft.com>, Florian Rivoal <florian@rivoal.net>, "public-houdini@w3.org" <public-houdini@w3.org>
On Mon, Jun 22, 2015 at 1:41 PM, François REMY
<francois.remy.dev@outlook.com> wrote:
>> >>> As you noted, if I want to animate the location of an object on the
>> >>> screen, I can use “transform” which transitions perfectly fine. The
>> >>> issue is that the “apply” hook will be run *after* transitions
>> >>> already took place. So, any change I’ll make to “transform” in the
>> >>> hook cannot possibly rely on the “transition” property to animate.
>> >>
>> >> Unless the changes are themselves driven by a transition, in which
>> >> case everything should work fine because apply will be called on each
>> frame.
>> >
>> > Give this a second thought. I understand you don't like my more complex
>> cases, but imagine simple cases like :
>> >
>> > #element { --border-width: 3px; --border-color: blue; transition: --
>> border-width 3s; }
>> > #element:hover { --border: 5px green; }
>> >
>> > How can I (in the apply hook of "--border") trigger a transition of "--border-
>> width"?
>>
>> You just set --border-width/etc, no?
>
> Well, if I understood correctly, Share and you told me that if "--first-number" does transition, then the "apply" hook computing "--both-numbers = --first-number + --second-number" will run at every frame [*], with the current value of "--first-number" every time.
>
> That means transition are already run at that point. This means I can't set "--border-width" and hope to see the browser start a transition, because he can't know if I want to actually do this or if the "--border-width" value I set is already the result of a computation resulting from the ongoing transitions.
>
> Right?
>
>
>
> [*] "Unless the changes are themselves driven by a transition, in which case everything should work fine because apply will be called on each frame" (Shane)
Ah, yeah, there's some confusion there. Need to nail down whether the
apply hook happens before or after transitions, and the answer will
exclude one of the behaviors mentioned here.
~TJ
Received on Monday, 22 June 2015 21:03:10 UTC