ObjectNode Class

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

Namespace:  System.Windows.Ink
Assembly:  IAWinFX (in IAWinFX.dll)

Syntax

'Declaration
Public NotInheritable Class ObjectNode _
    Inherits ContextNode
'Usage
Dim instance As ObjectNode

public sealed class ObjectNode : ContextNode

public ref class ObjectNode sealed : public ContextNode

public final class ObjectNode extends ContextNode

Remarks

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.

Examples

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);
        }
    }
}

Inheritance Hierarchy

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

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.0

See Also

Reference

ObjectNode Members

System.Windows.Ink Namespace

System.Windows.Ink.CustomRecognizerNode

Other Resources

Object Recognizers