public Digitizer(double physicalWidth, double physicalHeight, Vector?dpi = null)
{
// 96 DPI is the standard 100% scale
_dpi = dpi ?? new Vector(192, 192);
_scale = 96 / _dpi.X;
_width = physicalWidth * _scale;
_height = physicalHeight * _scale;
_prevTappedSlotIndex = -1;
_prevReports = new TouchReport[11];
for (int i = 0; i < 11; i++)
{
_prevReports[i] = new TouchReport(0, 32767, false);
}
// Discover DFR digitizer device
_digitizer = DeviceList.Local.GetHidDeviceOrNull(0x05ac, 0x8302);
if (_digitizer == null)
{
throw new Exception("iBridge HID digitizer not found");
}
_reportDescr = _digitizer.GetReportDescriptor();
}
private void ProcessEvent()
{
if (_hiddeviceInputParser.HasChanged)
{
int j = -1;
TouchReport[] currentReports = new TouchReport[11];
for (int i = 0; i < _hiddeviceInputParser.ValueCount; i++)
{
var data = _hiddeviceInputParser.GetValue(i);
if (data.Usages.FirstOrDefault() == VendorUsage.FingerIdentifier)
{
j++;
}
else
{
continue;
}
// Only 11 slots are statically allocated
if (j >= 11)
{
break;
}
// This is defined by the descriptor, we just take the assumption
var fingerTapData1 = _hiddeviceInputParser.GetValue(i + 1);
var fingerTapData2 = _hiddeviceInputParser.GetValue(i + 2);
var xData = _hiddeviceInputParser.GetValue(i + 3);
// Y is discarded but being read anyway
var yData = _hiddeviceInputParser.GetValue(i + 4);
// Register this
currentReports[j] = new TouchReport(xData.GetPhysicalValue(),
xData.DataItem.PhysicalMaximum, fingerTapData1.GetPhysicalValue() != 0);
}
// Check if need to raise touch leave event for prev slot
if (_prevTappedSlotIndex >= 0)
{
var scaledX = currentReports[_prevTappedSlotIndex].GetXInPercentage() * _width;
if (!currentReports[_prevTappedSlotIndex].FingerStatus)
{
Event?.Invoke(new RawMouseEventArgs(
BridgeFrameBufferPlatform.MouseDevice,
BridgeFrameBufferPlatform.Timestamp,
BridgeFrameBufferPlatform.TopLevel.InputRoot,
RawMouseEventType.LeftButtonUp,
new Point(scaledX, _height / 2),
default));
_prevTappedSlotIndex = -1;
}
else
{
// Update cache, raise move event and complete routine
if (BridgeFrameBufferPlatform.MouseDevice.Captured != null)
{
Event?.Invoke(new RawMouseEventArgs(
BridgeFrameBufferPlatform.MouseDevice,
BridgeFrameBufferPlatform.Timestamp,
BridgeFrameBufferPlatform.TopLevel.InputRoot,
RawMouseEventType.Move,
new Point(scaledX, _height / 2),
InputModifiers.LeftMouseButton));
}
}
}
// Can raise new tap event
if (_prevTappedSlotIndex == -1)
{
for (int i = 0; i < 11; i++)
{
if (currentReports[i].FingerStatus)
{
var scaledX = currentReports[i].GetXInPercentage() * _width;
Event?.Invoke(new RawMouseEventArgs(
BridgeFrameBufferPlatform.MouseDevice,
BridgeFrameBufferPlatform.Timestamp,
BridgeFrameBufferPlatform.TopLevel.InputRoot,
RawMouseEventType.LeftButtonDown,
new Point(scaledX, _height / 2),
default));
_prevTappedSlotIndex = i;
break;
}
}
}
// Update cache
_prevReports = currentReports;
}
}
