/// <summary>
/// Called when a shift is removed from one of the week's days. Reduces the
/// duration of the week by the duration of the shift.
/// </summary>
/// <param name="shift">The removed shift.</param>
public void ShiftRemoved(Shift shift)
{
Duration -= shift.Duration;
}
/// <summary>
/// Called when a new shift is added to one of the week's days. Increases the
/// duraton of the week by the duration of the shift.
/// </summary>
/// <param name="shift">The added shift.</param>
public void ShiftAdded(Shift shift)
{
Duration += shift.Duration;
}
