Catching drag cancel event in Qt - c++

Question

I'm experiencing some difficulties with catching application-scope events in Qt.
My purpose is to catch every user action in some GUI application. Of course I've overrided QApplication::notify handler and processing different types of application-scope events there. Something like that:
bool CoolApplication::notify(QObject *obj, QEvent *e)
{
switch (e->type()) {
case QEvent::MouseButtonPress:
case QEvent::MouseButtonRelease:
// Handle mouse
break;
case QEvent::Wheel:
// Handle wheel
break;
case QEvent::KeyPress:
case QEvent::KeyRelease:
// Handle keyboard and so on
break;
default:
break;
}
return QApplication::notify(obj, e);
}
That works pretty well until user starts drag-and-drop operation. Mouse press event is handled well, it is catched in my handler, life is beautiful there. The problems start when I try to catch mouse release event on Windows.
When entering drag operation mouse and keyboard events are no longer handled by QApplication::notify. It is possible to catch drop event when it was successfull (I can add case QEvent::Drop branch into my handler), but how to catch ignored drop or canceling drop with Esc? It seems impossible to be done directly, maybe I can catch drag event loop termination event or something like that? Or even maybe someone knows a direct way to do it?
Edit:
Once more turning the attention that I need to catch application-scope event, not the widget one

Answer 1

Please, try this
bool QtCoreApplication::notify(QObject *obj, QEvent *e)
{
switch (e->type()) {
case QEvent::QDropEvent:
QDropEvent* dropEvent = (QDropEvent*)e;
dropEvent->keyboardModifiers(); // keys pressed
dropEvent->dropAction(); // Drop result
break;
return QApplication::notify(obj, e);
}

Answer 2

As this remained an open item to us, we checked the usage of the destroyed signal.
This is fired at the moment the element is discarded, which seems to happen a the moment the QDrag is killed by the Escape key pressure
void dragDestroyed()
{
qDebug("drag and drop cancled by Escape key");
}
QDrag *drag = new QDrag(this);
connect( drag, SIGNAL(destroyed()), this, SLOT(dragDestroyed()) );
drag->exec(Qt::MoveAction);
probably this is relevant for anyone facing the issue.