GestureRecognizer クラス

定義

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

継承

Object

DispatcherObject

DependencyObject

GestureRecognizer

実装

IDisposable

例

次の例では、 Stroke が ScratchOut ジェスチャであるかどうかを判断する方法を示します。

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

注釈

GestureRecognizerは、インク ジェスチャを識別します。 アプリケーション ジェスチャのすべてまたはサブセットを認識するように GestureRecognizer を設定できます。 使用可能なジェスチャのサブセットを認識するように GestureRecognizer を設定するには、コンストラクターに ApplicationGesture 配列を渡すか、 SetEnabledGestures メソッドを使用します。 StrokeCollectionにジェスチャが含まれているかどうかを確認するには、Recognize メソッドを呼び出します。

XAML テキストの使用法

このクラスは XAML では使用できません。