GestureRecognizer 类

定义

识别墨迹笔势。Recognizes ink gestures.

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
继承
实现

示例

下面的示例演示如何确定是否Stroke ScratchOut为笔势。The following example demonstrates how to determine whether a Stroke is a ScratchOut gesture.

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

注解

GestureRecognizer标识墨迹笔势。A GestureRecognizer identifies an ink gesture. 你可以设置GestureRecognizer以识别所有或部分应用程序手势。You can set the GestureRecognizer to recognize all or a subset of application gestures. 若要将GestureRecognizer设置为识别可用笔势的子集, 请将ApplicationGesture数组传递给构造函数或使用SetEnabledGestures方法。To set the GestureRecognizer to recognize a subset of the available gestures, pass an ApplicationGesture array to the constructor or use the SetEnabledGestures method. 若要确定是否StrokeCollection包含该笔势, 请Recognize调用方法。To determine whether a StrokeCollection contains a gesture, call the Recognize method.

XAML 文本用法XAML Text Usage

不能在中XAMLXAML使用此类。You cannot use this class in XAMLXAML.

构造函数

GestureRecognizer()

初始化 GestureRecognizer 类的新实例。Initializes a new instance of the GestureRecognizer class.

GestureRecognizer(IEnumerable<ApplicationGesture>)

初始化 GestureRecognizer 类的新实例。Initializes a new instance of the GestureRecognizer class.

属性

DependencyObjectType

获取对此实例的 DependencyObjectType 类型进行包装的 CLRCLRGets the DependencyObjectType that wraps the CLRCLR type of this instance.

(继承自 DependencyObject)
Dispatcher

获取与此 Dispatcher 关联的 DispatcherObjectGets the Dispatcher this DispatcherObject is associated with.

(继承自 DispatcherObject)
IsRecognizerAvailable

获取一个布尔值,该值指示笔势识别器在用户系统中是否可用。Gets a Boolean that indicates whether the gesture recognizer is available on the user's system.

IsSealed

获取一个值,该值指示此实例当前是否为密封的(只读)。Gets a value that indicates whether this instance is currently sealed (read-only).

(继承自 DependencyObject)

方法

CheckAccess()

确定调用线程是否可以访问此 DispatcherObjectDetermines whether the calling thread has access to this DispatcherObject.

(继承自 DispatcherObject)
ClearValue(DependencyProperty)

清除属性的本地值。Clears the local value of a property. 要清除的属性由 DependencyProperty 标识符指定。The property to be cleared is specified by a DependencyProperty identifier.

(继承自 DependencyObject)
ClearValue(DependencyPropertyKey)

清除只读属性的本地值。Clears the local value of a read-only property. 要清除的属性由 DependencyPropertyKey 指定。The property to be cleared is specified by a DependencyPropertyKey.

(继承自 DependencyObject)
CoerceValue(DependencyProperty)

对指定依赖属性的值进行强制。Coerces the value of the specified dependency property. 通过对调用方 CoerceValueCallback 上存在的依赖属性的属性元数据中所指定的任何 DependencyObject 函数进行调用来完成此操作。This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.

(继承自 DependencyObject)
Dispose()

释放由 GestureRecognizer 使用的所有资源。Releases all resources used by the GestureRecognizer.

Equals(Object)

确定提供的 DependencyObject 是否等效于当前 DependencyObjectDetermines whether a provided DependencyObject is equivalent to the current DependencyObject.

(继承自 DependencyObject)
GetEnabledGestures()

获取 GestureRecognizer 识别的笔势。Gets the gestures that the GestureRecognizer recognizes.

GetHashCode()

获取此 DependencyObject 的哈希代码。Gets a hash code for this DependencyObject.

(继承自 DependencyObject)
GetLocalValueEnumerator()

创建一个专用的枚举数,用于确定哪些依赖项属性在此 DependencyObject 上具有以本地方式设置的值。Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject.

(继承自 DependencyObject)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
GetValue(DependencyProperty)

DependencyObject 的此实例返回依赖属性的当前有效值。Returns the current effective value of a dependency property on this instance of a DependencyObject.

(继承自 DependencyObject)
InvalidateProperty(DependencyProperty)

重新评估指定依赖属性的有效值。Re-evaluates the effective value for the specified dependency property.

(继承自 DependencyObject)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
OnPropertyChanged(DependencyPropertyChangedEventArgs)

每当更新此 DependencyObject 的任何依赖属性的有效值时调用。Invoked whenever the effective value of any dependency property on this DependencyObject has been updated. 更改的特定依赖属性将在事件数据中报告。The specific dependency property that changed is reported in the event data.

(继承自 DependencyObject)
ReadLocalValue(DependencyProperty)

如果存在,则返回依赖属性的本地值。Returns the local value of a dependency property, if it exists.

(继承自 DependencyObject)
Recognize(StrokeCollection)

在指定的 StrokeCollection 中寻找笔势。Looks for gestures in the specified StrokeCollection.

SetCurrentValue(DependencyProperty, Object)

设置依赖属性的值而不更改其值源。Sets the value of a dependency property without changing its value source.

(继承自 DependencyObject)
SetEnabledGestures(IEnumerable<ApplicationGesture>)

设置 GestureRecognizer 识别的应用程序笔势。Sets the application gestures that the GestureRecognizer recognizes.

SetValue(DependencyProperty, Object)

设置依赖属性的本地值,该值由其依赖属性标识符指定。Sets the local value of a dependency property, specified by its dependency property identifier.

(继承自 DependencyObject)
SetValue(DependencyPropertyKey, Object)

设置一个只读依赖属性的本地值,该值由依赖属性的 DependencyPropertyKey 标识符指定。Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property.

(继承自 DependencyObject)
ShouldSerializeProperty(DependencyProperty)

返回一个值,该值指示序列化进程是否应序列化所提供的依赖属性的值。Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.

(继承自 DependencyObject)
ToString()

返回一个表示当前对象的 string。Returns a string that represents the current object.

(继承自 Object)
VerifyAccess()

强制调用线程具有此 DispatcherObject 的访问权限。Enforces that the calling thread has access to this DispatcherObject.

(继承自 DispatcherObject)

适用于