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UNCONFIRMED
81040
mousewheel event wheelDeltaY data shows anomalies and jitter
https://bugs.webkit.org/show_bug.cgi?id=81040
Summary
mousewheel event wheelDeltaY data shows anomalies and jitter
Jason San Jose
Reported
2012-03-13 15:02:11 PDT
Steps to reproduce: 0. Requires a Mac with OSX 10.7 Lion for smooth trackpad scrolling (via laptop trackpad or external mouse/trackpad) 1. Download project from github (
https://github.com/njx/mousewheel-test
) or see attached zip 2. Open mousewheel-test.html 3. Follow instructions to perform a medium to large scroll 4. Observe output graph The graph shows wheelDeltaY values for the duration of the "mousewheel". The attached sample graph shows large anomalies during acceleration and jittering towards the end of deceleration.
Attachments
Graph of mousewheel event wheelDeltaY on a MacBook Air running 10.7.3 Lion
(56.98 KB, image/jpeg)
2012-03-13 15:03 PDT
,
Jason San Jose
no flags
Details
Archive of test project from https://github.com/njx/mousewheel-test
(34.23 KB, application/zip)
2012-03-13 15:03 PDT
,
Jason San Jose
no flags
Details
View All
Add attachment
proposed patch, testcase, etc.
Jason San Jose
Comment 1
2012-03-13 15:03:05 PDT
Created
attachment 131718
[details]
Graph of mousewheel event wheelDeltaY on a MacBook Air running 10.7.3 Lion
Jason San Jose
Comment 2
2012-03-13 15:03:49 PDT
Created
attachment 131720
[details]
Archive of test project from
https://github.com/njx/mousewheel-test
Alexey Proskuryakov
Comment 3
2012-03-13 16:54:03 PDT
Are you seeing this with Safari 5.1.3?
Jason San Jose
Comment 4
2012-03-13 16:56:39 PDT
Yes. Tested with Safari 5.1.4, Chrome 17.0.963.79 and Webkit nightly
r110587
.
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