/// <summary>
/// Provide the state of the dpad or hat switch if any.
/// If no dpad is found we return 'at rest'.
/// </summary>
/// <returns></returns>
public DirectionPadState GetDirectionPadState()
{
int index = GetValueCapabilitiesIndex((ushort)Hid.UsagePage.GenericDesktopControls, (ushort)GenericDesktop.HatSwitch);
if (index < 0)
{
//No hat switch found
return(DirectionPadState.Rest);
}
HIDP_VALUE_CAPS caps = Device.InputValueCapabilities[index];
if (caps.IsRange)
{
//Defensive
return(DirectionPadState.Rest);
}
uint dpadUsageValue = UsageValues[caps];
if (dpadUsageValue < caps.LogicalMin || dpadUsageValue > caps.LogicalMax)
{
//Out of range means at rest
return(DirectionPadState.Rest);
}
//Normalize value to start at zero
//TODO: more error check here?
DirectionPadState res = (DirectionPadState)((int)dpadUsageValue - caps.LogicalMin);
return(res);
}
void OnHidEvent(object aSender, Event aHidEvent)
{
if (!aHidEvent.Device.IsGamePad)
{
return;
}
#if DEBUG
if (aHidEvent.IsRepeat)
{
Logger.Debug("HID: Repeat");
}
#endif
HashSet <ushort> buttons = new HashSet <ushort>();
foreach (ushort usage in aHidEvent.Usages)
{
buttons.Add(usage);
}
//For each axis
Dictionary <ushort, HidAxisState> axisStates = new Dictionary <ushort, HidAxisState>();
foreach (KeyValuePair <HIDP_VALUE_CAPS, uint> entry in aHidEvent.UsageValues)
{
//HatSwitch is handled separately as direction pad state
if (entry.Key.IsRange || entry.Key.NotRange.Usage == (ushort)GenericDesktop.HatSwitch)
{
continue;
}
//Get our usage type
Type usageType = HidUtils.UsageType((UsagePage)entry.Key.UsagePage);
if (usageType == null)
{
continue;
}
//Get the name of our axis
string name = Enum.GetName(usageType, entry.Key.NotRange.Usage);
ushort index = entry.Key.NotRange.DataIndex;
axisStates[index] = new HidAxisState(name, index, entry.Value, entry.Key.BitSize);
}
DirectionPadState directionPadState = aHidEvent.GetDirectionPadState();
HidState state = new HidState
{
VendorId = aHidEvent.Device.VendorId,
ProductId = aHidEvent.Device.ProductId,
Name = aHidEvent.Device.Name,
FriendlyName = aHidEvent.Device.FriendlyName,
Buttons = buttons,
AxisStates = axisStates,
DirectionPadState = directionPadState
};
OnStateChanged(new HidStateEventArgs(state));
}
public static bool IsDirectionPadPressed(DirectionPadState directionPadState, HidState state)
{
return(state.DirectionPadState == directionPadState);
}
