[Webkit-unassigned] [Bug 94081] Implement DOM3 wheel event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=94081





--- Comment #6 from Masayuki Nakano <masayuki at d-toybox.com>  2013-08-19 19:38:17 PST ---
(In reply to comment #5)
> I am planning to keep support for the non-standard 'mousewheel' for backward compatibility.

For the compatibility:

1. "mousewheel" event should be fired *after* "wheel" event (it's the best way "mousewheel" fired from XP part automatically).
2. The default action should be performed after both "wheel" and "mousewheel" are fired and both of them are not consumed (their preventDefault() are not called).
3. "mousewheel" event should *not* be fired when the preceding "wheel" event is consumed.

And also, Firefox supports diagonal scroll (both deltaX and deltaY can be non-zero at an event) support only on Mac OS X.

Additionally, Firefox supports "onwheel" attribute and property of HTML elements. WebKit and Blink returns non-null for window.WheelEvent but they are not supporting "wheel" event. So, implementing "onwheel" on them are very helpful for Web application developers (they can use "onwheel" attribute support for checking "wheel" event support). This has not been standard yet, I filed a spec bug here:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=18542

FYI: Mozilla documents a lot of information about "mousewheel" and "wheel" event in MDN. I'm glad if they help you.

"mousewheel"
https://developer.mozilla.org/en-US/docs/DOM/DOM_event_reference/mousewheel
"MouseWheelEvent" interface
https://developer.mozilla.org/en-US/docs/Web/API/MouseWheelEvent
"wheel"
https://developer.mozilla.org/en-US/docs/Web/Reference/Events/wheel
"WheelEvent" interface
https://developer.mozilla.org/en-US/docs/Web/API/WheelEvent

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