[Webkit-unassigned] [Bug 107800] [Shadow] Retarget Touch.target for TouchEvent with multiple touches

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=107800





--- Comment #1 from Hayato Ito <hayato at chromium.org>  2013-01-24 05:45:24 PST ---
At first glance, we have to:

- Introduces TouchEventDispatchMediator
- Refactor EventContext so that it has additional fields, such as touches, targetTouches and changedTouches. Another ides is to have another class which inherites EventContext.
- Refactor EventRelatedTargetAdjuster so that it can be re-used from TouchEventDispatchMediator.

More importantly, we should be careful to the performance. In naive implementation, it takes O(n^2) times than simple MouseEvent relatedTarget-retargeting.
TouchEvent retargeting will involve N events times N retargetings (N is the number of touch points).

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