Reputation: 1395
I am porting my application from Qt4 to Qt5.
As far as I know, Qt5 does not support handling Xlib events anymore and uses
XCB events (event handler gets xcb_generic_event_t
object). However spnav
library I am using supports only X11 events (it parses XEvent
object to retrieve the necessary information). Is it possible to handle X11 events in Qt5 or convert xcb_generic_event_t
to XEvent
?
In Qt4 code looked like:
bool MyApplication::x11EventFilter(XEvent *event)
{
spnav_event sev;
spnav_x11_event(event,&sev);
if(sev.type == SPNAV_EVENT_MOTION)
{
emit joystickPositionEvent(sev.motion.x,sev.motion.y,sev.motion.z,sev.motion.rx,sev.motion.ry,sev.motion.rz);
}
else if(sev.type == SPNAV_EVENT_BUTTON)
{
emit joystickButtonEvent(sev.button.bnum,sev.button.press!=0);
}
return false;
}
Upvotes: 1
Views: 2984
Reputation: 11
In case others encounter the same issue: spnav_x11_event() only requires a couple fields to be copied - here's the code I've ended up with for FreeCAD:
spnav_event navEvent;
// Qt4 used XEvents in native event filters, but Qt5 changed to XCB. The
// SpaceNavigator API only works with XEvent, so we need to construct a
// temporary XEvent with just enough information for spnav_x11_event()
auto xcb_ev(static_cast<const xcb_client_message_event_t *>(message));
if ((xcb_ev->response_type & 0x7F) == XCB_CLIENT_MESSAGE) {
XClientMessageEvent xev;
xev.type = ClientMessage;
xev.message_type = xcb_ev->type;
memcpy(xev.data.b, xcb_ev->data.data8, sizeof(xev.data.b));
xev.serial = 0; // These are just to squash warnings...
xev.send_event = 0;
xev.display = 0;
xev.window = 0;
xev.format = 0;
if (!spnav_x11_event(reinterpret_cast<XEvent *>(&xev), &navEvent)) {
return false;
}
} else {
return false;
}
// navEvent is now initialised
Upvotes: 1