internal void UpdateState(RawStylusInputReport report)
{
Debug.Assert(report.TabletDeviceId == _tabletDevice.Id);
Debug.Assert((report.Actions & RawStylusActions.None) == 0);
_eventStylusPoints =
new StylusPointCollection( report.StylusPointDescription,
report.GetRawPacketData(),
GetTabletToElementTransform(null),
Matrix.Identity);
PresentationSource inputSource = DetermineValidSource(report.InputSource, _eventStylusPoints, report.PenContext.Contexts);
// See if we need to remap the stylus data X and Y values to different presentation source.
if (inputSource != null && inputSource != report.InputSource)
{
Point newWindowLocation = PointUtil.ClientToScreen(new Point(0, 0), inputSource);
newWindowLocation = _stylusLogic.MeasureUnitsFromDeviceUnits(newWindowLocation);
Point oldWindowLocation = _stylusLogic.MeasureUnitsFromDeviceUnits(report.PenContext.Contexts.DestroyedLocation);
// Create translate matrix transform to shift coords to map points to new window location.
MatrixTransform additionalTransform = new MatrixTransform(new Matrix(1, 0, 0, 1,
oldWindowLocation.X - newWindowLocation.X,
oldWindowLocation.Y - newWindowLocation.Y));
_eventStylusPoints = _eventStylusPoints.Reformat(report.StylusPointDescription, additionalTransform);
}
_rawPosition = _eventStylusPoints[_eventStylusPoints.Count - 1];
_inputSource = new SecurityCriticalDataClass<PresentationSource>(inputSource);
if (inputSource != null)
{
// Update our screen position from this move.
Point pt = _stylusLogic.DeviceUnitsFromMeasureUnits((Point)_rawPosition);
_lastScreenLocation = PointUtil.ClientToScreen(pt, inputSource);
}
// If we are not blocked from updating the location we want to use for the
// promoted mouse location then update it. We set this flag in the post process phase
// of Stylus events (after they have fired).
if (!_fBlockMouseMoveChanges)
{
_lastMouseScreenLocation = _lastScreenLocation;
}
if ((report.Actions & RawStylusActions.Down) != 0 ||
(report.Actions & RawStylusActions.Move) != 0)
{
_fInAir = false;
// Keep the stylus down location for turning system gestures into mouse event
if ((report.Actions & RawStylusActions.Down) != 0)
{
_needToSendMouseDown = true;
// reset the gesture flag. This is used to determine if we will need to fabricate a systemgesture tap on the
// corresponding up event.
_fGestureWasFired = false;
_fDetectedDrag = false;
_seenHoldEnterGesture = false;
// Make sure our drag and move deltas are up to date.
TabletDevice.UpdateSizeDeltas(report.StylusPointDescription, _stylusLogic);
}
// See if we need to do our own Drag detection (on Stylus Move event)
else if (inputSource != null && _fBlockMouseMoveChanges && _seenDoubleTapGesture && !_fGestureWasFired && !_fDetectedDrag)
{
Size delta = TabletDevice.CancelSize;
// We use the first point of the packet data for Drag detection to try and
// filter out cases where the stylus skips when going down.
Point dragPosition =(Point)_eventStylusPoints[0];
dragPosition = _stylusLogic.DeviceUnitsFromMeasureUnits(dragPosition);
dragPosition = PointUtil.ClientToScreen(dragPosition, inputSource);
// See if we need to detect a Drag gesture. If so do the calculation.
if ((Math.Abs(_lastMouseScreenLocation.X - dragPosition.X) > delta.Width) ||
(Math.Abs(_lastMouseScreenLocation.Y - dragPosition.Y) > delta.Height))
{
_fDetectedDrag = true;
}
}
}
UpdateEventStylusPoints(report, false);
if ((report.Actions & RawStylusActions.Up) != 0 ||
(report.Actions & RawStylusActions.InAirMove) != 0)
{
_fInAir = true;
if ((report.Actions & RawStylusActions.Up) != 0)
{
_sawMouseButton1Down = false; // reset this on Stylus Up.
}
}
}
internal void UpdateEventStylusPoints(RawStylusInputReport report, bool resetIfNoOverride)
{
if (report.RawStylusInput != null && report.RawStylusInput.StylusPointsModified)
{
GeneralTransform transformToElement = report.RawStylusInput.Target.ViewToElement.Inverse;
//note that RawStylusInput.Target (of type StylusPluginCollection)
//guarantees that ViewToElement is invertible
Debug.Assert(transformToElement != null);
_eventStylusPoints = report.RawStylusInput.GetStylusPoints(transformToElement);
}
else if (resetIfNoOverride)
{
_eventStylusPoints =
new StylusPointCollection(report.StylusPointDescription,
report.GetRawPacketData(),
GetTabletToElementTransform(null),
Matrix.Identity);
}
}
