922908 - Mouse movement can interrupt touch scrolling with APZC enabled

Status: RESOLVED DUPLICATE of bug 917385

(Firefox for Metro Graveyard :: Pan and Zoom, defect)

Description

[Matt Brubeck (:mbrubeck)]

Attachment: patch

Bug 896017 added code to prevent us from switching input modes in the middle of a touch gesture.  This is no longer working correctly with APZC enabled though, because APZC cancels the touch and stops dispatching touch events during a pan.  Instead we need to listen for notifications from APZC.

Note: Even with this patch, I get some odd behavior if I move the mouse while panning, but it happens after the pan instead of interrupting it.  I'll file a follow-up bug on that once I've investigated it a bit more.

Comment 1

[Jim Mathies [:jimm]]

I think the right fix to this is just to do it down in widget/windows/winrt code (bug 917385). It'll be easy there to detect which input we are receiving and fire an observer as a result. With apz it's almost impossible to keep the front end state accurate.