Bug 195914

Summary: [ContentChangeObserver] Add support for observing implicit transitions
Product: WebKit Reporter: zalan <zalan>
Component: Layout and RenderingAssignee: zalan <zalan>
Status: RESOLVED FIXED    
Severity: Normal CC: bfulgham, dino, dstockwell, ews-watchlist, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
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Patch simon.fraser: review+

Description zalan 2019-03-18 15:03:29 PDT 
ssia
Comment 1 zalan 2019-03-18 15:09:31 PDT 
Created attachment 365073 [details]
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Comment 2 zalan 2019-03-18 15:51:09 PDT 
Created attachment 365080 [details]
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Comment 3 zalan 2019-03-18 16:44:41 PDT 
Created attachment 365089 [details]
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Comment 4 Simon Fraser (smfr) 2019-03-18 18:10:20 PDT 
Comment on attachment 365089 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=365089&action=review

> Source/WebCore/page/ios/ContentChangeObserver.cpp:130
> +void ContentChangeObserver::didFinishAnimationOrTransition(const RenderElement& renderer)

You can be running transition on multiple properties on an element. it might transition margin-left for 10ms, and left for 200ms. What happens then? Seems like you need to track per CSS property ID.

You might also run one transition, then another animation, all with different properties.

> Source/WebCore/rendering/RenderElement.cpp:2175
> +    document().contentChangeObserver().didStartAnimationOrTransition(*this, propertyID, Seconds { timeOffset });

Is it a timeOffset or a duration?

> Source/WebCore/rendering/RenderElement.cpp:2194
> +        document().contentChangeObserver().didStartAnimationOrTransition(*this, animation->property(), Seconds { timeOffset });

Ditto. Is animation ever non-null?
Comment 5 zalan 2019-03-18 18:13:39 PDT 
(In reply to Simon Fraser (smfr) from comment #4)
> Comment on attachment 365089 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=365089&action=review
> 
> > Source/WebCore/page/ios/ContentChangeObserver.cpp:130
> > +void ContentChangeObserver::didFinishAnimationOrTransition(const RenderElement& renderer)
> 
> You can be running transition on multiple properties on an element. it might
> transition margin-left for 10ms, and left for 200ms. What happens then?
> Seems like you need to track per CSS property ID.
> 
> You might also run one transition, then another animation, all with
> different properties.
We track only one property at this point.
Comment 6 zalan 2019-03-19 08:30:40 PDT 
Created attachment 365162 [details]
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Comment 7 zalan 2019-03-19 09:25:03 PDT 
Created attachment 365170 [details]
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Comment 8 zalan 2019-03-20 20:25:04 PDT 
Created attachment 365470 [details]
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Comment 9 Radar WebKit Bug Importer 2019-03-20 20:27:03 PDT 
<rdar://problem/49091959>
Comment 10 zalan 2019-03-20 20:28:57 PDT 
Created attachment 365471 [details]
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Comment 11 zalan 2019-03-21 11:33:16 PDT 
Committed r243304: <https://trac.webkit.org/changeset/243304>