Hi, Using compiz it is possible to assign shortcuts to various actions. When such a shortcut is activated, it has to be blocked and not dispatched to the underlying applications. This works well for keyboard and button 1 to 3 with grabs. But for mouse wheel (button 4,5) it seems to have no effect.
We think to have found the issue: with XI2, scroll is now reported as a special kind of motion, and only emulated as button clicks for legacy clients. This means that the XGrabButton() call will not prevent XI2-aware clients from receiving scroll events. We need to somehow grab XI_Motion events associated with scrolling. Example in GTK3 for the code in GTK3 generating "smooth scroll" events: https://gitlab.gnome.org/GNOME/gtk/blob/gtk-3-24/gdk/x11/gdkdevicemanager-xi2.c#L1727 I'm not yet sure how to grab those, but I'm leaning towards XIGrabDevice(), although it seems a little too aggressive on some aspects, for example we do not want to block completely the desktop if something goes wrong in compiz itself and pointer is grabbed. Is this the only way to go? Is there some better way? No X.org guru on our side so maybe we miss something obvious… better ask here for some informations before doing this badly. (BTW I'm no compiz dev, but willing to submit a patch there and also I'm not subscribed to the list.) Thanks in advance! -- Jonathan Michalon _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: https://lists.x.org/mailman/listinfo/xorg Your subscription address: %(user_address)s
