internal PointerStylusDevice(PointerTabletDevice tabletDevice, UnsafeNativeMethods.POINTER_DEVICE_CURSOR_INFO cursorInfo)
{
_cursorInfo = cursorInfo;
_tabletDevice = tabletDevice;
_pointerLogic = StylusLogic.GetCurrentStylusLogicAs <PointerLogic>();
// Touch devices have a special set of handling code
if (tabletDevice.Type == TabletDeviceType.Touch)
{
TouchDevice = new PointerTouchDevice(this);
}
_interactionEngine = new PointerInteractionEngine(this);
_interactionEngine.InteractionDetected += HandleInteraction;
List <StylusButton> buttons = new List <StylusButton>();
// Create a button collection for this StylusDevice based off the button properties stored in the tablet
// This needs to be done as each button instance has a StylusDevice owner that it uses to access the raw
// data in the StylusDevice.
foreach (var prop in _tabletDevice.DeviceInfo.StylusPointProperties)
{
if (prop.IsButton)
{
StylusButton button = new StylusButton(StylusPointPropertyIds.GetStringRepresentation(prop.Id), prop.Id);
button.SetOwner(this);
buttons.Add(button);
}
}
_stylusButtons = new StylusButtonCollection(buttons);
}
/// <summary>
/// Creates WPF property infos from WM_POINTER device properties. This appropriately maps and converts HID spec
/// properties found in WM_POINTER to their WPF equivalents. This is based on code from the WISP implementation
/// that feeds the legacy WISP based stack.
/// </summary>
/// <param name="prop">The pointer property to convert</param>
/// <returns>The equivalent WPF property info</returns>
internal static StylusPointPropertyInfo CreatePropertyInfo(UnsafeNativeMethods.POINTER_DEVICE_PROPERTY prop)
{
StylusPointPropertyInfo result = null;
// Get the mapped GUID for the HID usages
Guid propGuid =
StylusPointPropertyIds.GetKnownGuid(
(StylusPointPropertyIds.HidUsagePage)prop.usagePageId,
(StylusPointPropertyIds.HidUsage)prop.usageId);
if (propGuid != Guid.Empty)
{
StylusPointProperty stylusProp = new StylusPointProperty(propGuid, StylusPointPropertyIds.IsKnownButton(propGuid));
// Set Units
StylusPointPropertyUnit?unit = StylusPointPropertyUnitHelper.FromPointerUnit(prop.unit);
// If the parsed unit is invalid, set the default
if (!unit.HasValue)
{
unit = StylusPointPropertyInfoDefaults.GetStylusPointPropertyInfoDefault(stylusProp).Unit;
}
// Set to default resolution
float resolution = StylusPointPropertyInfoDefaults.GetStylusPointPropertyInfoDefault(stylusProp).Resolution;
short mappedExponent = 0;
if (_hidExponentMap.TryGetValue((byte)(prop.unitExponent & HidExponentMask), out mappedExponent))
{
float exponent = (float)Math.Pow(10, mappedExponent);
// Guard against divide by zero or negative resolution
if (prop.physicalMax - prop.physicalMin > 0)
{
// Calculated resolution is a scaling factor from logical units into the physical space
// at the given exponentiation.
resolution =
(prop.logicalMax - prop.logicalMin) / ((prop.physicalMax - prop.physicalMin) * exponent);
}
}
result = new StylusPointPropertyInfo(
stylusProp,
prop.logicalMin,
prop.logicalMax,
unit.Value,
resolution);
}
return(result);
}
