How to use QCoreApplication::postEvent to inject synthetic input events

Can you use QApplication::widgetAt() to find the correct widget at the position and then post to that?

QPoint pos(x, y);
QMouseEvent *event = new QMouseEvent(type, pos, mouse_button, mouse_buttons,  Qt::NoModifier);
QWidget *receiver = QApplication::widgetAt(pos);
QCoreApplication::postEvent(receiver, event);

I wouldn't expect that you would have to do this for the key events though. They should be sent to the focused widget (QApplication::focusWidget()).

Unfortunately, I haven't tested any of this.

I would suggest posting some code as according to the documentation the signature is:

void QCoreApplication::postEvent ( QObject * receiver, QEvent * event ) [static]

Have you tried giving a pointer to the corresponding QObject as the receiver argument?

(edit: note that QWidget inherits QObject)