inputmapper

ButtonState[] state = new ButtonState[12];

/// <summary>
/// Updates the status of the virtual controller.
/// </summary>
public void Update()
{
    PollState();

    for (int i = 0; i < 12; i++)
    {
        state[i] = (ButtonState)(((int)state[i]) >> 1);
        if (IsButtonDown((Buttons)i))
            state[i] |= ButtonState.Pressed;
        }
    }
}

/// <summary>
/// Polls the state of the physical input device.
/// </summary>
protected abstract void PollState();

/// <summary>
/// Gets the current state of the specified virtual button from the physical input device.
/// </summary>
/// <param name="button">Identifies the virtual button whose state should be polled.</param>
public abstract bool IsButtonDown(Buttons button);