> > But it would certainly be a useful addition to the Xinerama extension to
> > send "EnterXineramaHead" and LeaveXineramaHead events - IIRC X
> > extensions can introduce new events. If these events contain the a
> > head number, interested applications can then easily maintain
information
> > about the set of heads the pointer is in (even for the pathological case
> > of overlapping heads).
>
> Well, this *can* be a useful addition if we find a real case when
> it is needed. Than we can try to persuade Mark Vojkovich to add this
> functionality to X (BTW, what is interesting -- he also uses fvwm). But
> there must be some real, hard arguments, otherwise this definitely
> wouldn't pass the X Xinerama group.
All the same reasons why you want to get enter and leave events on the root
window
in multi-screen scenarios, I guess. Of course, the application with the
strongest interest
in such information is the window manager, but toolkits could also use it as
a low-overhead
way to find the necessary information for e.g. restricting menus to be
completely onscreen
(or rather "onxineramascreen").
In fact, I would thing that enter/leave notification would be a very natural
feature
and I can't think of any possible reasons for the X Xinerama group to not
accept it.
Matthias
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