ContextLink Class

Article
10/20/2012

Represents a relationship between two ContextNode objects that is not a parent-child relationship.

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

Syntax

'Declaration
Public Class ContextLink
'Usage
Dim instance As ContextLink

public class ContextLink

public ref class ContextLink

public class ContextLink

Remarks

Examples of the relationship represented by a ContextLink relationship include:

A ParagraphNode that is encircled by an InkDrawingNode. A ContextLink object is created and added to the Links properties of both the ParagraphNode and the InkDrawingNode. The InkDrawingNode is the SourceNode and the ParagraphNode is the DestinationNode.
An AnalysisHintNode and a WritingRegionNode. When an AnalysisHintNode is used in ink analysis, a ContextLink is created between the WritingRegionNode and the AnalysisHintNode. The AnalysisHintNode is the SourceNode and the WritingRegionNode is the DestinationNode.
Two InkDrawingNode objects where a line is drawn between them, as in a flow chart.

To determine the relationship between SourceNode and DestinationNode uses the InkDrawingNode.SemanticType or WritingRegionNode.SemanticType property on the appropriate node.

Examples

The following example finds all the nodes that are linked to the ContextNode named selectedNode. If selectedNode is not a destination node, the destination node is added to an ArrayList named destinationNodes. If selectedNode is not the source node, it is added to an ArrayList named sourceNodes.

Dim destinationNodes As New ArrayList()
Dim sourceNodes As New ArrayList()

' Find all the nodes that link to the currently selected node. 
Dim link As ContextLink
For Each link In  selectedNode.Links
    If link.DestinationNode <> selectedNode Then
        destinationNodes.Add(link.DestinationNode)
    End If 

    If link.SourceNode <> selectedNode Then
        sourceNodes.Add(link.SourceNode)
    End If 
Next link

ArrayList destinationNodes = new ArrayList();
ArrayList sourceNodes = new ArrayList();

// Find all the nodes that link to the currently selected node. 
foreach (ContextLink link in selectedNode.Links)
{
    if (link.DestinationNode != selectedNode)
    {
        destinationNodes.Add(link.DestinationNode);
    }

    if (link.SourceNode != selectedNode)
    {
        sourceNodes.Add(link.SourceNode);
    }
}

The following example finds all WritingRegionNode objects in the node tree of an InkAnalyzer named theInkAnalyzerWithHint. It then puts those that are linked to an AnalysisHintNode with a Factoid of "IS_DATE_FULLDATE" into a ContextNodeCollection, named writingRegionsWithFactoids.

Dim writingRegionsWithFactoids As New ContextNodeCollection(Me.theInkAnalyzerWithHint)
Dim allWritingRegions As ContextNodeCollection = Me.theInkAnalyzerWithHint.FindNodesOfType(ContextNodeType.WritingRegion)
Dim writingRegion As WritingRegionNode
For Each writingRegion In  allWritingRegions
    ' See if they are linked to any factoid 
    Dim link As ContextLink
    For Each link In  writingRegion.Links
        If link.SourceNode.Type = ContextNodeType.AnalysisHint Then 
            Dim hint As AnalysisHintNode = CType(link.SourceNode, AnalysisHintNode)
            If hint.Factoid = "IS_DATE_FULLDATE" Then
                writingRegionsWithFactoids.Add(writingRegion)
            End If 
        End If 
    Next link
Next writingRegion

ContextNodeCollection writingRegionsWithFactoids =
    new ContextNodeCollection(this.theInkAnalyzerWithHint);
ContextNodeCollection allWritingRegions =
    this.theInkAnalyzerWithHint.FindNodesOfType(ContextNodeType.WritingRegion);
foreach (WritingRegionNode writingRegion in allWritingRegions)
{
    // See if they are linked to any factoid 
    foreach (ContextLink link in writingRegion.Links)
    {
        if (link.SourceNode.Type == ContextNodeType.AnalysisHint)
        {
            AnalysisHintNode hint = (AnalysisHintNode)link.SourceNode;
            if (hint.Factoid == "IS_DATE_FULLDATE")
            {
                writingRegionsWithFactoids.Add(writingRegion);
            }
        }
    }
}

Inheritance Hierarchy

System.Object
System.Windows.Ink.ContextLink

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

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