public static void linkDateToSeanceWidget(SeanceWidget widget, int posH, int posV) {
long newDate = DateUtil.computeNewDate(posH, posV);
if (widget.getBeginning() != 0) // if it is not a new SeanceWidget
widget.getTeaching().removeSeance(widget.getBeginning());
widget.getTeaching().addSeance(DateUtil.setDateToDB(newDate));
ServerCommunication.getInstance().updateTeaching(widget.getTeaching());
widget.setBeginning(DateUtil.setDateToDB(newDate));
}
public static void unlinkTheSeanceWidget(SeanceWidget widget) {
widget.getTeaching().removeSeance(widget.getBeginning());
ServerCommunication.getInstance().updateTeaching(widget.getTeaching());
}