@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == left) {
weeknum -= 1;
gls.notifyListeners(ChangeType.PREVWEEK, null);
} else if (e.getSource() == right) {
weeknum += 1;
gls.notifyListeners(ChangeType.NEXTWEEK, null);
} else {
ArrayList<Object> a = new ArrayList<Object>();
a.add(e.getSource());
gls.notifyListeners(ChangeType.APPBUTTON, a);
}
}
public void addGuiListener(GUIListener l) {
gls.add(l);
}