Bug 81040 - mousewheel event wheelDeltaY data shows anomalies and jitter
: mousewheel event wheelDeltaY data shows anomalies and jitter
Status: UNCONFIRMED
: WebKit
Event Handling
: 528+ (Nightly build)
: Macintosh Intel Mac OS X 10.7
: P3 Normal
Assigned To:
: https://github.com/njx/mousewheel-test
:
:
:
  Show dependency treegraph
 
Reported: 2012-03-13 15:02 PST by
Modified: 2012-03-22 15:19 PST (History)


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 PST, 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 PST, Jason San Jose
no flags Details


Note

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Description From 2012-03-13 15:02:11 PST
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.
------- Comment #1 From 2012-03-13 15:03:05 PST -------
Created an attachment (id=131718) [details]
Graph of mousewheel event wheelDeltaY on a MacBook Air running 10.7.3 Lion
------- Comment #2 From 2012-03-13 15:03:49 PST -------
Created an attachment (id=131720) [details]
Archive of test project from https://github.com/njx/mousewheel-test
------- Comment #3 From 2012-03-13 16:54:03 PST -------
Are you seeing this with Safari 5.1.3?
------- Comment #4 From 2012-03-13 16:56:39 PST -------
Yes. Tested with Safari 5.1.4, Chrome 17.0.963.79 and Webkit nightly r110587.