protected void removeImplicitTransitions(Activity activity) {
Transition leaving = activity.getDefaultLeavingTransition();
Transition arriving = activity.getDefaultArrivingTransition();
activity.removeArrivingTransition(arriving);
activity.removeLeavingTransition(leaving);
Activity successor = (Activity) leaving.getTo();
successor.removeArrivingTransition(leaving);
successor.addArrivingTransition(arriving);
}
public void reorderNode(int oldIndex, int newIndex) {
// remove activity from its old position and disconnect it from other nodes
List activities = getActivities();
Activity reorderedActivity = (Activity) activities.remove(oldIndex);
removeImplicitTransitions(reorderedActivity);
// connect activity to its new predecessor and successor
Activity predecessor = (newIndex == 0 ? getBegin() : (Activity) activities.get(newIndex - 1));
Activity successor =
newIndex == activities.size() ? getEnd() : (Activity) activities.get(newIndex);
Transition leaving = predecessor.getDefaultLeavingTransition();
successor.removeArrivingTransition(leaving);
reorderedActivity.addArrivingTransition(leaving);
reorderedActivity.connect(successor);
activities.add(newIndex, reorderedActivity);
}