NotifyGrab

[Samuel Thibault]

Hello,

One additionnal piece of information: it seems that what makes compiz
have the issue (compared to my simple X root event listener) is the call
to

XSetInputFocus (s->dpy (), priv->id, RevertToPointerRoot, CurrentTime);

on the window that after that acquires the grab.

Samuel

Samuel Thibault, on ven. 24 nov. 2017 12:04:27 +0100, wrote:
> Samuel Thibault, on ven. 24 nov. 2017 11:55:49 +0100, wrote:
> > Jasper St. Pierre, on jeu. 23 nov. 2017 14:31:32 -0800, wrote:
> > > Selecting for XI2 events will disable core input events from being sent to your
> > > client.
> > 
> > I forgot to mention: I'm not getting these focus events in Compiz even
> > without selecting for XI2, and selecting for XI2 focus events does not
> > bring XI_FocusIn/Out events either.
> 
> I mean, I do get XI_FocusIn/Out events, but not at the moment when the
> application calls XGrabKeyboard(), and not even when the application
> receives a KeyPress event (and Compiz too since it receives it via XI2,
> that's precisely the problem: it needs to know that this KeyPress
> happened while grabbing was in effect).
> 
> > > On Thu, Nov 23, 2017 at 8:37 AM, Samuel Thibault <[1]
> > > samuel.thibault at ens-lyon.org> wrote:
> > > 
> > >     Hello,
> > > 
> > >     I'm working on making compiz use XI2 to get more fine-grain hold
> > >     on keypresses.  I'm however getting an issue: I do not always get
> > >     NotifyGrab FocusIn events from the root window when a client calls
> > > 
> > >     XGrabKeyboard (mydisplay, mywindow, True, GrabModeAsync, GrabModeAsync,
> > >     CurrentTime);
> > > 
> > >     , which prevents from properly respecting grabbing.
> > > 
> > > 
> > >     Unfortunately, I didn't manage to reproduce the issue with a simpler X
> > >     root event listener: runnning
> > > 
> > >     XSelectInput(mydisplay, DefaultRootWindow(mydisplay), FocusChangeMask);
> > > 
> > >     does properly bring focus out/in NotifyGrab events, but these events
> > >     don't get to Compiz. I also tried to listen on the window itself with
> > >     the same result: my simple event listener gets the event, but Compiz
> > >     does not.
> > > 
> > >     Oddly enough, this seems to depend on the application: kvm / virtualbox
> > >     grabbing have the issue, but vncviewer grabbing doesn't have the issue.
> > > 
> > >     Reading [2]https://tronche.com/gui/x/xlib/input/XGrabKeyboard.html tells me
> > >     that there should always be FocusIn / FocusOut events being generated,
> > >     so I don't immediately see where to look for in the differences between
> > >     by simple listener and Compiz.
> > > 
> > >     Could there be some undocumented cases where such events are not
> > >     generated?  Any idea where I could look in the X server to check what is
> > >     happening?
> > > 
> > >     Samuel
> > >     _______________________________________________
> > >     [3]xorg-devel at lists.x.org: X.Org development
> > >     Archives: [4]http://lists.x.org/archives/xorg-devel
> > >     Info: [5]https://lists.x.org/mailman/listinfo/xorg-devel
> > > 
> > > 
> > > 
> > > 
> > > --
> > >   Jasper
> > > 
> > > References:
> > > 
> > > [1] mailto:samuel.thibault at ens-lyon.org
> > > [2] https://tronche.com/gui/x/xlib/input/XGrabKeyboard.html
> > > [3] mailto:xorg-devel at lists.x.org
> > > [4] http://lists.x.org/archives/xorg-devel
> > > [5] https://lists.x.org/mailman/listinfo/xorg-devel
> > 
> > > _______________________________________________
> > > xorg-devel at lists.x.org: X.Org development
> > > Archives: http://lists.x.org/archives/xorg-devel
> > > Info: https://lists.x.org/mailman/listinfo/xorg-devel
> > 
> > 
> > -- 
> > Samuel
> >  J'ai un gros problème: j'ai cet exercice à rendre demain lundi, mais ma
> >  TI 89 ne sait pas le faire...
> >  Est-ce que quelqu'un pourrait m'aider??
> >  -+- OD In Guide du Neuneu Usenet : Comment ça ! Il faut réfléchir ?-+-
> 
> -- 
> Samuel
> <B> l'alim je sais où elle est, elle est juste à côté de la dame qui dort
> <g> B: clairement faut revoir les priorités dans la vie
> <g> B: une dame ça se retrouve, un uptime...

-- 
Samuel
<y> update-menus: relocation error: update-menus: symbol _ZNSt9basic_iosIcSt11char_traitsIcEE4initEPSt15basic_streambufIcS1_E, version GLIBCPP_3.2 not defined in file libstdc++.so.5 with link time reference
<y> quoi que ça peut bien vouloir dire ?
<D> N a eu la meme merde
<y> c ça que ça veut dire ? wow, c'est bien crypté :)
 -+- #ens-mim s'entraide -+-