ObjectNode - класс

Статья
11/04/2008

Обновлен: Ноябрь 2007

Represents a ContextNode for a node that is returned from an object custom recognizer.

Пространство имен: System.Windows.Ink
Сборка: IAWinFX (в IAWinFX.dll)

Синтаксис

'Декларация
Public NotInheritable Class ObjectNode _
    Inherits ContextNode
'Применение
Dim instance As ObjectNode

public sealed class ObjectNode : ContextNode

public ref class ObjectNode sealed : public ContextNode

public final class ObjectNode extends ContextNode

public final class ObjectNode extends ContextNode

Заметки

For more information about how object recognizers work, see Object Recognizers.

An ObjectNode cannot contain any child elements.

ObjectNode objects are only contained by a CustomRecognizerNode object.

Примеры

The following example loops through the child nodes of a CustomRecognizerNode object, musicRecognizer. It then finds each ObjectNode and retrieves the relevant properties. The application treats each ObjectNode as a musical note. The custom recognizer adds five properties (letter, octave, measure, withinMeasure, and duration) to describe the note. The GetPropertyData method retrieves the data with the following Guid members: noteLetterId, noteOctaveId, noteMeasureId, noteWithinMeasureId, and noteDurationId. After all the data is collected, the DrawNote method draws the note.

Dim subNode As ContextNode
For Each subNode In  musicRecognizer.SubNodes
    If TypeOf subNode Is ObjectNode Then
        ' Assume all object nodes represent notes
        Dim noteObject As ObjectNode = CType(subNode, ObjectNode)
        Dim letter As String
        If noteObject.ContainsPropertyData(Me.noteLetterId) Then
            letter = CStr(noteObject.GetPropertyData(Me.noteLetterId))
        Else
            letter = ""
        End If 
        Dim octave As Integer
        If noteObject.ContainsPropertyData(Me.noteOctaveId) Then
            octave = Fix(noteObject.GetPropertyData(Me.noteOctaveId))
        Else
            octave = - 1
        End If 
        Dim measure As Integer
        If noteObject.ContainsPropertyData(Me.noteMeasureId) Then
            measure = Fix(noteObject.GetPropertyData(Me.noteMeasureId))
        Else
            measure = - 1
        End If 
        Dim withinMeasure As Integer
        If noteObject.ContainsPropertyData(Me.noteWithinMeasureId) Then
            withinMeasure = Fix(noteObject.GetPropertyData(Me.noteWithinMeasureId))
        Else
            withinMeasure = - 1
        End If 
        Dim duration As Integer
        If noteObject.ContainsPropertyData(Me.noteOctaveId) Then
            duration = Fix(noteObject.GetPropertyData(Me.noteDurationId))
        Else
            duration = - 1
        End If 
        ' Draw note if all data is valid
        If letter.Length > 0 AndAlso octave >= 0 AndAlso _
            measure >= 0 AndAlso withinMeasure >= 0 AndAlso duration >= 0 Then
            DrawNote(letter, octave, measure, withinMeasure, duration)
        End If
    End If
Next subNode

foreach (ContextNode subNode in musicRecognizer.SubNodes)
{
    if (subNode is ObjectNode)
    {
        // Assume all object nodes represent notes
        ObjectNode noteObject = (ObjectNode)subNode;
        string letter;
        if (noteObject.ContainsPropertyData(this.noteLetterId))
            letter = (string)noteObject.GetPropertyData(this.noteLetterId);
        else
            letter = "";

        int octave;
        if (noteObject.ContainsPropertyData(this.noteOctaveId))
            octave = (int)noteObject.GetPropertyData(this.noteOctaveId);
        else
            octave = -1;

        int measure;
        if (noteObject.ContainsPropertyData(this.noteMeasureId))
            measure = (int)noteObject.GetPropertyData(this.noteMeasureId);
        else
            measure = -1;

        int withinMeasure;
        if (noteObject.ContainsPropertyData(this.noteWithinMeasureId))
            withinMeasure = (int)noteObject.GetPropertyData(this.noteWithinMeasureId);
        else
            withinMeasure = -1;

        int duration;
        if (noteObject.ContainsPropertyData(this.noteOctaveId))
            duration = (int)noteObject.GetPropertyData(this.noteDurationId);
        else
            duration = -1;

        // Draw note if all data is valid
        if (letter.Length > 0 && octave >= 0 && measure >= 0 &&
            withinMeasure >= 0 && duration >= 0)
        {
            DrawNote(letter, octave, measure, withinMeasure, duration);
        }
    }
}

Иерархия наследования

System.Object
System.Windows.Ink.ContextNode
System.Windows.Ink.ObjectNode

Потокобезопасность

Любые открытые члены этого типа, объявленные как static (Shared в Visual Basic), являются потокобезопасными. Потокобезопасность членов экземпляров не гарантируется.

Платформы

Windows Vista

Среды .NET Framework и .NET Compact Framework поддерживают не все версии каждой платформы. Поддерживаемые версии перечислены в разделе Требования к системе для .NET Framework.

Сведения о версии

.NET Framework

Поддерживается в версии: 3.0

См. также

Ссылки

ObjectNode - члены

System.Windows.Ink - пространство имен

System.Windows.Ink.CustomRecognizerNode

Другие ресурсы

Object Recognizers

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