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[web-anim] Web animations minutes, 17 / 18 January 2013

From: Brian Birtles <bbirtles@mozilla.com>
Date: Fri, 18 Jan 2013 13:57:48 +0900
Message-ID: <50F8D64C.4010405@mozilla.com>
To: "public-fx@w3.org" <public-fx@w3.org>
Web animations minutes, 17 / 18 January 2013

Etherpad: https://etherpad.mozilla.org/ep/pad/view/ro.azLN80xgeWa/latest
Present: Tab Atkins, Dmitry Baranovskiy, Steve Block, Shane Stephens, 
Douglas Stockwell,  Brian Birtles

Agenda:

1. Status update
2. Interface options: reworking time sources
3. Interface options: with or without Timing object

1. STATUS UPDATE
================

Doug: Polyfill
  - animation of rect(), shadow, visibility
  - all properties/types referenced by CSS Transitions supported
  - all other properties animated as non-numeric types (not interpolated)

Shane: Polyfill
  - rest of length implemented
  - started implementing the rest of transforms
Spec:
  - Spring timing research
  - play control proposal

Brian: API research, play control review and proposal

Steve: Latest TimeSource proposal, plus trial implementation in polyfill


2. INTERFACE OPTIONS: REWORKING TIME SOURCES
============================================

Brian's comments, research, and proposal:
http://www.w3.org/Graphics/fx/wiki/Web_Animations/Play_Control_Review
http://www.w3.org/Graphics/fx/wiki/Web_Animations/API_Comparison

Alternative proposal #2:

* Have a separate PlayController object
** One per 'tree'
* Animations / groups have controller member that returns a 
PlayControllerProxy--it tracks the PlayController associated with the 
timed item even when re-parented
* Animations have a start() method. ''This'' is what you call when you 
first create an animation.
** Not sure about the semantics here when adding to a group etc., but 
for simple animations you create them, then call start
* play() and pause() are on the controller
* TimedItem.currentTime is read-only
* PlayController.currentTime is writeable
* Run-time playbackRate control (the version that does a compensatory 
seek) is on the controller
* Setting TimedItem.playbackRate causes 're-layout'
* Disadvantages: Different to HTML

Discussed trade-offs and advantages of all three approaches. Looks like 
Brian still mostly doesn't like the Shane/Steve/Doug-preferred approach 
and Shane/Steve/Doug still mostly don't like the Brian-preferred approach.


3. INTERFACE OPTIONS: WITH OR WITHOUT Timing
============================================

(1) Discussed having vs. not having a timing item
(2) Looked at the possibility of dropping one or both of activeDuration 
and iterationDuration, or at least making them read-only.
(3) Did not reach consensus

The two main options are as follows:

Option 1:
anim.startTime
anim.currentTime
anim.endTime
anim.startDelay
anim.iterationDuration
anim.resetIterationDuration();
anim.activeDuration // read-only?
anim.fillMode
anim.playbackRate
anim.(etc)

Option 2:
anim.startTime // READ ONLY - don't even provide and beef up 
AnimationController?
anim.currentTime // READ ONLY - don't even provide and beef up 
AnimationController?
anim.endTime // READ ONLY - don't even provide and beef up 
AnimationController?
anim.timing.startDelay
anim.timing.iterationDuration
anim.timing.fillMode
anim.timing.playbackRate
anim.timing.(etc)
anim.getActiveDuration() // getActiveDuration
anim.getIterationDuration() // for groups, maybe even put on TimingGroup 
interface.


Next meeting: Tues Jan 22, 16:00 PST / Wed 23 Jan 11:00 AEDST / Wed 23 
Jan 9:00 JST @ https://etherpad.mozilla.org/pBOIanK3jm

Past meetings: http://www.w3.org/Graphics/fx/wiki/Web_Animations/Meetings
Received on Friday, 18 January 2013 04:58:17 GMT

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