Implementation of TouchArea using TUIO API for QML application

[Sil20]

Hello,
For one of my project We implemented a QML plugin not to be dependent to QT evolutions on multitouch Touchareas.
It works perfectely using Windows event. But we need to be abble to touch 2 separated touch screens simultaneously.
We found the TUIO implementation, and I started adding the code into my plugin. It works but we have to manage every thing inside :

• ToucheArea overlaping / Depth
• toucheArea coordinate computations
• TUIO send the globale normalised position of the touch point in the whole windows desktop
  My class is defined like this:
  @class QDeclarativeTouchArea : public QDeclarativeItem , TUIO::TuioListener
  {@

I have several questions:

• In My QML Application I have a List of QDeclarativeTouchArea, How to sort them from the one at the top to the one at the bottom? Since in QML the z property AND the instanciation order defined both the depth of hte instance?
• How to get the coordinates of the touche Area in the global windwos desktop?

Here is a simplified illustration of the situation:
!http://imageshack.us/a/img197/2268/ppx1.jpg
(TUIO Illustration)!

[Sil20]

Hello I manage to go forward I try to generat an QtouchEvent, and to post it to the QApplication, in order to use the native QT filtering:
@bool QDeclarativeTouchArea::event(QEvent *event)@
@bool QDeclarativeTouchArea::sceneEventFilter(QGraphicsItem *i, QEvent *event)@

The problem is:

• the coordinate of the point coming from TUIO is correct
• the event is send
• But none of my touch areas received the events!!
• The native windows touch events are received properly!

Here after is the code for the TUIO to QT event mapping function.
@bool QDeclarativeTouchArea::tuioToQtEvent(TUIO::TuioCursor *tcur, QEvent::Type eventType)
{
//Create Event structure
QTouchEvent event(eventType);
QListQTouchEvent::TouchPoint touchPoints = event.touchPoints();
QTouchEvent::TouchPoint p;

//Get Normalized globale position
QPointF lp;
lp.setX(tcur->getPosition().getX());
lp.setY(tcur->getPosition().getY());

int id = tcur->getCursorID();

//Set Values
p.setNormalizedPos(lp);
p.setId(id);

//p.setPressure(point->pressure);
//p.setRect(point->area);
//p.setScreenPos(point->area.center());

switch (eventType) {
    case QEvent::TouchBegin:
    {
        p.setState(Qt::TouchPointPressed );
        touchPoints.append(p);
        break;
    }
    case QEvent::TouchUpdate:
    {
        p.setState(Qt::TouchPointMoved);
        touchPoints.append(p);
        break;
    }
    case QEvent::TouchEnd:
    {
        p.setState(Qt::TouchPointReleased );
        touchPoints.append(p);
        //touchPoints. Update Existing
        break;
    }
    default:
    {
        break;
    }
}

//copy data into event structure
event.setTouchPoints(touchPoints);

//Send Event to main application
qDebug()<< "QDeclarativeTouchArea::tuioToQtEvent"<< "QApplication::sendEvent(QApplication::instance(), &event)";
QApplication::sendEvent(QApplication::instance(), &event);

return true;

}@