On Thu, Nov 19, 2015 at 7:47 PM, Peter Hutterer <[email protected]> wrote:
> > we had a bit of a discussion on IRC here, this is the attempt of a summary: > A wl_touch.enter/leave event pair makes sense for some use-cases and can > fix > the xdg_popup case. The idea here is that if you move between two surfaces > *of the same client* you send a wl_touch.leave(old_surface) followed by a > wl_touch.enter(new_surface), with a wl_touch.update all within the same > frame. Both enter/leave carry the touch ID and are thus per touchpoint. > > If a client is capable of handling the new enter/leave events, this is a > way > to tell them that a touch has moved away and that surface doesn't have it > anymore, and for the new surface that a touch has appeared but wasn't set > down in that spot (so it won't trigger in-client gestures like tapping). > In X term, a wl_touch.enter/leave is similar to NotifyGrab. > You know I have been trying to point out that the equivalent bug exists on wl_pointer enter/leave events for a couple years now, but all I get is hostility (witness recent emails). If you do manage to fix this problem, perhaps you could look into getting it fixed there, too? Using a frame is a method of fixing it, but I think sending the enter event first, or not sending the exit at all, would also work.
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