[Webkit-unassigned] [Bug 26850] New: CSS Animations need hooks for controls: pause/play, scrubbing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=26850

           Summary: CSS Animations need hooks for controls: pause/play,
                    scrubbing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
               URL: http://dev.w3.org/csswg/css3-animations/
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: andy at andymatuschak.org


The new CSS animation functionality's great, but they're a little limited. I
request:

1. The ability to pause and play animations. The animation-play-state property
is deprecated (and unimplemented on the desktop), and it suggests that clients
could get the computed state, remove the animation, and then set the style.

I implemented this, but it resulted in the animation appearing to flick
backwards a few frames when paused, since it had proceeded somewhat in another
thread after I'd computed the style but before I'd removed the animation. So
this is not a workable alternative. And for what it's worth, that's a pretty
ugly workaround.

2. Hooks for scrubbing. Specifically, to implement a decent scrubber, the
client must be able to jump the animation to a particular point and query how
far it has progressed.


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