Статья
06/13/2011

StylusInfo

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents information about the state of the stylus.

Syntax Notes

Cannot be instantiated, must use an existing property value.

Methods

Equals, FindName (DependencyObject), GetHost, GetValue, SetValue

Properties

IsInverted, Name (DependencyObject), DeviceType (StylusInfo)

Managed Equivalent

StylusDevice

Remarks

For mouse input that is used for ink support in lieu of a stylus, the DeviceType property returns Mouse.

Example

The following example uses the PressureFactor property to determine the size of a stroke. The PressureFactor is obtained from the first StylusPoint of each stroke, and then the stroke Width and Height is calculated by multiplying the PressureFactor by 20.

var agCtrl;
var inkPresenter; // Corresponds to the InkPresenter element in XAML.
var newStroke = null; // The Stroke variable for mouse handlers.
var daWidth;
var daHeight;

function root_Loaded(sender, args) 
{
    // Get the HTML object that contains the Silverlight plug-in.
    agCtrl = sender.GetHost();
    inkPresenter = sender.findname("inkPresenterElement");
}

// Capture mouse movement when the left button is pressed, and then create the stroke.
function InkPresenterMouseDown(sender,args)
{
   inkPresenter.CaptureMouse();
   newStroke = agCtrl.content.createFromXaml('<Stroke/>');
   
   // Get the DeviceType.
   if(args.GetStylusInfo().deviceType == "Stylus")
   {
     var sps = args.GetStylusPoints(inkPresenter);
     SetStylusStrokeSize(sps);
   }
   // If the device type is not a stylus, use the default stroke height and width.
   else
   {
     daWidth = 3;
     daHeight = 3;
   }
   
   // Set the drawing attributes properties.
   newStroke.DrawingAttributes.Width = daWidth;
   newStroke.DrawingAttributes.Height = daHeight;
   newStroke.DrawingAttributes.Color = "Blue";
   newStroke.DrawingAttributes.OutlineColor = "Orange";
   
   newStroke.StylusPoints.AddStylusPoints(args.GetStylusPoints(inkPresenter));
   inkPresenter.Strokes.Add(newStroke);
}

// Add the new points to the Stroke.
function InkPresenterMouseMove(sender,args)
{
   if (newStroke != null)
   {
      newStroke.StylusPoints.AddStylusPoints(args.GetStylusPoints(inkPresenter));
   }
}

// Release the mouse.
function InkPresenterMouseUp(sender,args)
{
   newStroke = null;
}

// Set the size of the stroke based on the initial pressureFactor of the stroke.
function SetStylusStrokeSize(sps)
{
    var p;
    // Set variable p to the first StylusPoint in the Stroke.
    p = sps.getItem(0).pressureFactor;
    daWidth = p * 20.0;
    daHeight = p * 20.0;
}

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