GestureRecognizer Classe

Definizione

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

Ereditarietà

Object

DispatcherObject

DependencyObject

GestureRecognizer

Implementazioni

IDisposable

Esempio

Nell'esempio seguente viene illustrato come determinare se un Stroke oggetto è un ScratchOut movimento.

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

Commenti

Un GestureRecognizer oggetto identifica un movimento penna. È possibile impostare l'oggetto GestureRecognizer per riconoscere tutti o un subset di movimenti dell'applicazione. Per impostare l'oggetto GestureRecognizer per riconoscere un subset dei movimenti disponibili, passare una ApplicationGesture matrice al costruttore o usare il SetEnabledGestures metodo . Per determinare se un StrokeCollection oggetto contiene un movimento, chiamare il Recognize metodo .

Utilizzo del testo XAML

Non è possibile usare questa classe in XAML.

Costruttori

Proprietà

Metodi

Si applica a