GestureRecognizer Clase

Definición

public ref class GestureRecognizer sealed : System::Windows::DependencyObject, IDisposable

public sealed class GestureRecognizer : System.Windows.DependencyObject, IDisposable

type GestureRecognizer = class
    inherit DependencyObject
    interface IDisposable

Public NotInheritable Class GestureRecognizer
Inherits DependencyObject
Implements IDisposable

Herencia

Object

DispatcherObject

DependencyObject

GestureRecognizer

Implementaciones

IDisposable

Ejemplos

En el ejemplo siguiente se muestra cómo determinar si un Stroke es un ScratchOut gesto.

private bool InterpretScratchoutGesture(Stroke stroke)
{
    // Attempt to instantiate a recognizer for scratchout gestures.
    ApplicationGesture[] gestures = { ApplicationGesture.ScratchOut };
    GestureRecognizer recognizer = new GestureRecognizer(gestures);

    if (!recognizer.IsRecognizerAvailable)
        return false;

    // Determine if the stroke was a scratchout gesture.
    StrokeCollection gestureStrokes = new StrokeCollection();
    gestureStrokes.Add(stroke);

    ReadOnlyCollection<GestureRecognitionResult> results = recognizer.Recognize(gestureStrokes);

    if (results.Count == 0)
        return false;

    // Results are returned sorted in order strongest-to-weakest; 
    // we need only analyze the first (strongest) result.
    if (results[0].ApplicationGesture == ApplicationGesture.ScratchOut &&
          results[0].RecognitionConfidence == RecognitionConfidence.Strong)
    {
        // Use the scratchout stroke to perform hit-testing and 
        // erase existing strokes, as necessary.
        return true;
    }
    else
    {
        // Not a gesture: display the stroke normally.
        return false;
    }
}

Private Function InterpretScratchoutGesture(ByVal stroke As Stroke) As Boolean
    ' Attempt to instantiate a recognizer for scratchout gestures.
    Dim gestures() As ApplicationGesture = {ApplicationGesture.ScratchOut}

    Dim recognizer As New GestureRecognizer(gestures)

    If Not recognizer.IsRecognizerAvailable Then
        Return False
    End If

    ' Determine if the stroke was a scratchout gesture.
    Dim gestureStrokes As StrokeCollection = New StrokeCollection()
    gestureStrokes.Add(stroke)

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

    If results.Count = 0 Then
        Return False
    End If

    ' Results are returned sorted in order strongest-to-weakest; 
    ' we need only analyze the first (strongest) result.
    If (results(0).ApplicationGesture = ApplicationGesture.ScratchOut) Then

        ' Use the scratchout stroke to perform hit-testing and 
        ' erase existing strokes, as necessary.
        Return True
    Else
        ' Not a gesture: display the stroke normally.
        Return False
    End If
End Function

Comentarios

Identifica GestureRecognizer un gesto de entrada de lápiz. Puede establecer para GestureRecognizer que reconozca todos o un subconjunto de gestos de aplicación. Para establecer para GestureRecognizer que reconozca un subconjunto de los gestos disponibles, pase una ApplicationGesture matriz al constructor o use el SetEnabledGestures método . Para determinar si contiene StrokeCollection un gesto, llame al Recognize método .

Uso de texto XAML

No se puede usar esta clase en XAML.

Constructores

Propiedades

Métodos

Se aplica a