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RawStylusInput Class

Provides information about input from a StylusDevice to a StylusPlugIn.

Namespace: System.Windows.Input.StylusPlugIns
Assembly: PresentationCore (in presentationcore.dll)

'Declaration
Public Class RawStylusInput
'Usage
Dim instance As RawStylusInput

public class RawStylusInput
public class RawStylusInput
You cannot use this managed class in XAML.

Use the RawStylusInput to get information about the input the StylusPlugIn receives when the user moves the stylus.

The following example creates a StylusPlugIn that checks for the Down gesture. The StylusPlugIn calls NotifyWhenProcessed in OnStylusUp to subscribe to the OnStylusUpProcessed method, which is called from the application thread.

Class RecognizerPlugin
    Inherits StylusPlugIn
    Private recognizer As GestureRecognizer

    ' StylusPointCollection that contains the stylus points of the current
    ' stroke.
    Private points As StylusPointCollection

    ' Keeps track of the stylus to check whether two styluses are used on the
    ' digitizer.
    Private currentStylus As Integer

    Public Sub New()
        recognizer = New GestureRecognizer()

    End Sub 'New


    ' Collect the points as the user draws the stroke.
    Protected Overrides Sub OnStylusDown(ByVal rawStylusInput As RawStylusInput)

        ' If points is not null, there is already a stroke taking place
        ' on the digitizer, so don't create a new StylusPointsCollection.
        If points Is Nothing Then
            points = New StylusPointCollection(rawStylusInput.GetStylusPoints().Description)
            points.Add(rawStylusInput.GetStylusPoints())
            currentStylus = rawStylusInput.StylusDeviceId
        End If

    End Sub 'OnStylusDown

    ' Collect the points as the user draws the stroke.
    Protected Overrides Sub OnStylusMove(ByVal rawStylusInput As RawStylusInput)

        ' Check whether the stylus that started the stroke is the same, and
        ' that the element hasn't lost focus since the stroke began.
        If Not (points Is Nothing) AndAlso currentStylus = rawStylusInput.StylusDeviceId Then
            points.Add(rawStylusInput.GetStylusPoints())
        End If

    End Sub 'OnStylusMove

    ' Collect the points as the user draws the stroke.
    Protected Overrides Sub OnStylusUp(ByVal rawStylusInput As RawStylusInput)

        ' Check whether the stylus that started the stroke is the same, and
        ' that the element hasn't lost focus since the stroke began.
        If Not (points Is Nothing) AndAlso currentStylus = rawStylusInput.StylusDeviceId Then
            points.Add(rawStylusInput.GetStylusPoints())

            ' Subscribe to the OnStylusUpProcessed method.
            rawStylusInput.NotifyWhenProcessed(points)
        End If

        points = Nothing
        currentStylus = 0

    End Sub 'OnStylusUp

    ' If the element loses focus, stop collecting the points and don't
    ' perform gesture recognition.
    Protected Overrides Sub OnStylusLeave(ByVal rawStylusInput As RawStylusInput, ByVal confirmed As Boolean)

        If confirmed Then
            ' Clear the StylusPointCollection
            points = Nothing
            currentStylus = 0
        End If

    End Sub 'OnStylusLeave

    ' This method is called on the application thread.
    Protected Overrides Sub OnStylusUpProcessed(ByVal callbackData As Object, ByVal targetVerified As Boolean)

        ' Check that the element actually receive the OnStylusUp input.
        If targetVerified AndAlso recognizer.IsRecognizerAvailable Then

            Dim strokePoints As StylusPointCollection = callbackData

            If strokePoints Is Nothing Then
                Return
            End If

            ' Create a StrokeCollection to pass to the GestureRecognizer.
            Dim newStroke As New Stroke(strokePoints)
            Dim strokes As New StrokeCollection()
            strokes.Add(newStroke)

            Dim results As ReadOnlyCollection(Of GestureRecognitionResult) = recognizer.Recognize(strokes)

            ' If the GestureRecognizer recognizes the stroke as a Down
            ' gesture with strong confidence, raise an event.
            If results(0).ApplicationGesture = ApplicationGesture.Down AndAlso _
               results(0).RecognitionConfidence = RecognitionConfidence.Strong Then
                'raise event
            End If
        End If

    End Sub 'OnStylusUpProcessed 
End Class 'RecognizerPlugin

System.Object
  System.Windows.Input.StylusPlugIns.RawStylusInput

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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