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Avoid duplicate emulated mouse events with XInput2 

When using a touch screen on a Linux machine, we receive both touch-events
and emulated mouse events from XInput, on top of that we synthesize mouse-
events ourselves for the touch events.

This patch grabs the touch device for touch events whenever it processes
a touch-begin thereby avoiding XInput from synthesizing mouse events.

Task-number: QTBUG-35157
Change-Id: I5849d5841be236d6719cd080af2e9e39eb9cdd84
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
bb10
Allan Sandfeld Jensen 2013-12-04 12:51:28 +01:00 committed by The Qt Project
parent 8a6766d78b
commit 2c65b78b40
1 changed files with 16 additions and 0 deletions
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16
src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
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@ -432,6 +432,22 @@ void QXcbConnection::xi2HandleEvent(xcb_ge_event_t *event)
qDebug() << " touchpoint " << touchPoint.id << " state " << touchPoint.state << " pos norm " << touchPoint.normalPosition <<
" area " << touchPoint.area << " pressure " << touchPoint.pressure;
QWindowSystemInterface::handleTouchEvent(platformWindow->window(), xiEvent->time, dev->qtTouchDevice, m_touchPoints.values());
if (has_touch_without_mouse_emulation) {
// We need to grab the touch event to prevent mouse emulation.
if (xiEvent->evtype == XI_TouchBegin) {
XIEventMask xieventmask;
unsigned int bitMask = 0;
unsigned char *xiBitMask = reinterpret_cast<unsigned char *>(&bitMask);
xieventmask.deviceid = xiEvent->deviceid;
xieventmask.mask = xiBitMask;
xieventmask.mask_len = sizeof(bitMask);
bitMask |= XI_TouchBeginMask;
bitMask |= XI_TouchUpdateMask;
bitMask |= XI_TouchEndMask;
XIGrabDevice(static_cast<Display *>(m_xlib_display), xiEvent->deviceid, platformWindow->winId(), xiEvent->time, None, GrabModeAsync, GrabModeAsync, true, &xieventmask);
} else if (xiEvent->evtype == XI_TouchEnd)
XIUngrabDevice(static_cast<Display *>(m_xlib_display), xiEvent->deviceid, xiEvent->time);
}
if (touchPoint.state == Qt::TouchPointReleased)
// If a touchpoint was released, we can forget it, because the ID won't be reused.
m_touchPoints.remove(touchPoint.id);