[Webkit-unassigned] [Bug 36593] Huge difference in wheelDelta between Webkit and Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=36593


Andy Estes <aestes at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |aestes at apple.com




--- Comment #3 from Andy Estes <aestes at apple.com>  2010-03-25 20:10:38 PST ---
Wheel deltas were changed in r56012 to be in increments of 120 per wheel tick
for compatibility reasons.  For detailed commentary, see
https://bugs.webkit.org/show_bug.cgi?id=29601.

In WebKit nightly builds, you should now expect a wheelDelta of 120 for each
tick of the device's scroll wheel.  When using a continuous scrolling device on
the Mac (trackpads or Mighty/Magic Mice), any movement on the scrolling surface
is considered at least one "tick".  These devices are more fine-grained than
traditional wheel mice so will generate larger wheelDeltas (but always in
increments of 120).

By the way, using your test case as an example, you should notice that WebKit
nightlies now exactly match the behavior of Chrome on the Mac and of both IE
and Chrome on WIndows.  The only browser that Safari should be "faster" than is
Firefox, which has fundamentally different behavior, including a different
event name and an inverted y-axis.

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