public XboxController(uint controller)
{
if (controller > Native.XUSER_MAX_COUNT - 1)
throw new ArgumentException("Controller is not in valid range.", "controller");
_controller = controller;
_lastState = new XINPUT_STATE();
ButtonDown += OnButtonDown;
ButtonUp += OnButtonUp;
TriggerChanged = delegate { };
StickChanged = delegate { };
_timer = new Timer(Timer);
}
public static extern uint XInputGetState(uint dwUserIndex, XINPUT_STATE* pState);
private bool IsButtonUp(ref XINPUT_STATE state, uint button)
{
return (((state.Gamepad.wButtons & button) == 0) && (_lastState.Gamepad.wButtons & button) != 0);
}
private void FilterState(ref XINPUT_STATE state)
{
if ((state.Gamepad.sThumbLX < Native.XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE &&
state.Gamepad.sThumbLX > -Native.XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE) &&
(state.Gamepad.sThumbLY < Native.XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE &&
state.Gamepad.sThumbLY > -Native.XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE))
{
state.Gamepad.sThumbLX = 0;
state.Gamepad.sThumbLY = 0;
}
if ((state.Gamepad.sThumbRX < Native.XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE &&
state.Gamepad.sThumbRX > -Native.XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE) &&
(state.Gamepad.sThumbRY < Native.XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE &&
state.Gamepad.sThumbRY > -Native.XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE))
{
state.Gamepad.sThumbRX = 0;
state.Gamepad.sThumbRY = 0;
}
if (state.Gamepad.bLeftTrigger < Native.XINPUT_GAMEPAD_TRIGGER_THRESHOLD)
state.Gamepad.bLeftTrigger = 0;
if (state.Gamepad.bRightTrigger < Native.XINPUT_GAMEPAD_TRIGGER_THRESHOLD)
state.Gamepad.bRightTrigger = 0;
}
private void Timer(object o)
{
var state = GetState();
FilterState(ref state);
if (state.dwPacketNumber == _lastState.dwPacketNumber)
return; // no point to check for changes, or is it.. :P
var upButtons = Enum.GetValues(typeof (Button)).Cast<Button>().Where(button => IsButtonUp(ref state, (uint) button)).Aggregate(new Button(), (current, button) => current | button);
var downButtons = Enum.GetValues(typeof (Button)).Cast<Button>().Where(button => IsButtonDown(ref state, (uint) button)).Aggregate(new Button(), (current, button) => current | button);
if (upButtons != 0)
ButtonUp(this, new ButtonEventArgs(upButtons));
if (downButtons != 0)
ButtonDown(this, new ButtonEventArgs(downButtons));
if (state.Gamepad.bLeftTrigger != _lastState.Gamepad.bLeftTrigger)
TriggerChanged(this, new TriggerEventArgs(state.Gamepad.bLeftTrigger, Side.Left));
if (state.Gamepad.bRightTrigger != _lastState.Gamepad.bRightTrigger)
TriggerChanged(this, new TriggerEventArgs(state.Gamepad.bRightTrigger, Side.Right));
if (state.Gamepad.sThumbLX != _lastState.Gamepad.sThumbLX || state.Gamepad.sThumbLY != _lastState.Gamepad.sThumbLY)
StickChanged(this, new StickEventArgs(state.Gamepad.sThumbLX, state.Gamepad.sThumbLY, Side.Left));
if (state.Gamepad.sThumbRX != _lastState.Gamepad.sThumbRX || state.Gamepad.sThumbRY != _lastState.Gamepad.sThumbRY)
StickChanged(this, new StickEventArgs(state.Gamepad.sThumbRX, state.Gamepad.sThumbRY, Side.Right));
_lastState = state;
}