[Webkit-unassigned] [Bug 75506] Improve touch handling performance by reusing the hitTest result

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75506





--- Comment #13 from Min Qin <qinmin at chromium.org>  2012-01-23 07:58:51 PST ---
And one more thing on finger moves off the target:

>From the spec: https://dvcs.w3.org/hg/webevents/raw-file/tip/touchevents.html:
5.6 The touchmove event
The target of this event must be the same Element on which the touch point started when it was first placed on the surface, even if the touch point has since moved outside the interactive area of the target element.

Even if the finger is off the target, the :active should still remain on the touch down target. Until touch is released. So user should still see the original touch target is activated.

(In reply to comment #11)
> We already have code that avoids moving the frame on hittests that are read-only. Was this really necessary in trunk to fix this bug?
> 
> While this patch is still an optimization. It makes it impossible to improve the :active handling to for instance stop showing :active if the finger moves off the target.
> 
> :active is used to show the user what is activated, but once the finger ends off the target this link will no longer be activated, and thus the :active feedback to user will be wrong.

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