private void MoveDown(Task t)
{
MoveBy(t, 1);
}
private void MoveUp(Task t)
{
MoveBy(t, -1);
}
private void MoveBy(Task t, int move)
{
int listpos = tasks_.IndexOf(t);
int newpos = listpos + move;
// Is this a valid new position?
if (newpos < 0 || newpos >= tasks_.Count)
return;
int orderpos = t.Order;
Task other = tasks_[newpos];
t.Order = other.Order;
other.Order = orderpos;
tasks_.Move(listpos, newpos);
}