StylusPlugIn.OnStylusDown(RawStylusInput) Method

Reference

Definition

Namespace:: System.Windows.Input.StylusPlugIns

Assembly:: PresentationCore.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Occurs on a thread in the pen thread pool when the tablet pen touches the digitizer.

protected:
 virtual void OnStylusDown(System::Windows::Input::StylusPlugIns::RawStylusInput ^ rawStylusInput);

protected virtual void OnStylusDown (System.Windows.Input.StylusPlugIns.RawStylusInput rawStylusInput);

abstract member OnStylusDown : System.Windows.Input.StylusPlugIns.RawStylusInput -> unit
override this.OnStylusDown : System.Windows.Input.StylusPlugIns.RawStylusInput -> unit

Protected Overridable Sub OnStylusDown (rawStylusInput As RawStylusInput)

Parameters

rawStylusInput: RawStylusInput

A RawStylusInput that contains information about input from the pen.

Examples

The following example demonstrates how to override the OnStylusDown method. To create a StylusPlugIn that restricts ink to a certain area, see the StylusPlugIn overview.

protected override void OnStylusDown(RawStylusInput rawStylusInput)
{
    // Run the base class before modifying the data
    base.OnStylusDown(rawStylusInput);

    // Get the StylusPoints that have come in
    StylusPointCollection stylusPoints = rawStylusInput.GetStylusPoints();

    // Modify the (X,Y) data to move the points 
    // inside the acceptable input area, if necessary
    for (int i = 0; i < stylusPoints.Count; i++)
    {
        StylusPoint sp = stylusPoints[i];
        if (sp.X < 50) sp.X = 50;
        if (sp.X > 250) sp.X = 250;
        if (sp.Y < 50) sp.Y = 50;
        if (sp.Y > 250) sp.Y = 250;
        stylusPoints[i] = sp;
    }

    // Copy the modified StylusPoints back to the RawStylusInput
    rawStylusInput.SetStylusPoints(stylusPoints);
}

Protected Overrides Sub OnStylusDown(ByVal rawStylusInput As RawStylusInput) 
    ' Run the base class before we modify the data
    MyBase.OnStylusDown(rawStylusInput)
    
    ' Get the StylusPoints that have come in
    Dim stylusPoints As StylusPointCollection = rawStylusInput.GetStylusPoints()
    
    ' Modify the (X,Y) data to move the points 
    ' inside the acceptable input area, if necessary.
    Dim i As Integer

    For i = 0 To stylusPoints.Count - 1

        Dim sp As StylusPoint = stylusPoints(i)

        If sp.X < 50 Then
            sp.X = 50
        End If

        If sp.X > 250 Then
            sp.X = 250
        End If

        If sp.Y < 50 Then
            sp.Y = 50
        End If

        If sp.Y > 250 Then
            sp.Y = 250
        End If

        stylusPoints(i) = sp
    Next i
    
    ' Copy the modified StylusPoints back to the RawStylusInput
    rawStylusInput.SetStylusPoints(stylusPoints)

End Sub

Remarks

This method occurs on a pen thread, so minimize work in this method to avoid impacting performance.

Applies to

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