ContextNodeDeleting Event

InkAnalyzer.ContextNodeDeleting Event

Occurs before the InkAnalyzer deletes a ContextNode.

Namespace:  Microsoft.Ink
Assembly:  Microsoft.Ink.Analysis (in Microsoft.Ink.Analysis.dll)

'Declaration
Public Event ContextNodeDeleting As ContextNodeDeletingEventHandler
'Usage
Dim instance As InkAnalyzer 
Dim handler As ContextNodeDeletingEventHandler 

AddHandler instance.ContextNodeDeleting, handler

Use this event when your application maintains its own data structure, which is synchronized with that of the InkAnalyzer. This event occurs during the reconcile phase of ink analysis, or in response to an InkAnalyzer method that deletes a ContextNode.

Before the InkAnalyzer deletes a ContextNode, the InkAnalyzer removes all of the strokes from the ContextNode and removes all of the links to other ContextNode objects. Before the ContextNode is removed, InkAnalyzer may raise the following events.

For more information about synchronizing your application data with the InkAnalyzer, see Data Proxy with Ink Analysis.

This example defines a method, AttachDataProxyEventHandlers, that attaches data proxy event handlers to an InkAnalyzer, theInkAnalyzer.

Private Sub AttachDataProxyEventHandlers() 
    ' If the document model supports on demand data proxy, then add an 
    ' event handler for the PopulateContextNode event. This event is raised 
    ' when the InkAnalyzer accesses a partially populated ContextNode created 
    ' by the document model. 
    If Me.theDocumentModel.SupportsOnDemandDataProxy Then 
        AddHandler Me.theInkAnalyzer.PopulateContextNode, AddressOf Me.PopulateContextNode
    End If 

    ' Add the other data proxy related event handlers. These events are raised 
    ' by the InkAnalyzer to communicate ink analysis results to the document model. 
    AddHandler Me.theInkAnalyzer.ContextNodeCreated, AddressOf Me.AddContextNode
    AddHandler Me.theInkAnalyzer.ContextNodeDeleting, AddressOf Me.RemoveContextNode
    AddHandler Me.theInkAnalyzer.ContextNodeLinkAdding, AddressOf Me.AddContextNodeLink
    AddHandler Me.theInkAnalyzer.ContextNodeLinkDeleting, AddressOf Me.RemoveContextNodeLink
    AddHandler Me.theInkAnalyzer.ContextNodeMovingToPosition, AddressOf Me.MoveContextNodeToPosition
    AddHandler Me.theInkAnalyzer.ContextNodePropertiesUpdated, AddressOf Me.UpdateContextNodeProperties
    AddHandler Me.theInkAnalyzer.ContextNodeReparenting, AddressOf Me.ReparentContextNode
    AddHandler Me.theInkAnalyzer.InkAnalyzerStateChanging, AddressOf Me.InkAnalyzer_StateChanging
    AddHandler Me.theInkAnalyzer.StrokesReparented, AddressOf Me.ReparentStroke
    AddHandler Me.theInkAnalyzer.IntermediateResultsUpdated, AddressOf Me.ResultsAvailable
    AddHandler Me.theInkAnalyzer.ResultsUpdated, AddressOf Me.ResultsAvailable

End Sub 'AttachDataProxyEventHandlers

The following example defines the method, RemoveContextNode, that handles the ContextNodeDeleting event. The event information is passed to the document model object, theDocumentModel.

This example does not provide the definition of the document model or demonstrate how it processes the information passed to it.

'/ <summary> 
'/ Handles the InkAnalyzer.ContextNodeDeleting event. 
'/ </summary> 
'/ <param name="sender">The source of the event.</param> 
'/ <param name="e">The event data.</param> 
Private Sub RemoveContextNode( _
    ByVal sender As Object, _
    ByVal e As Microsoft.Ink.ContextNodeDeletingEventArgs)

    ' Do not remove unclassified ink nodes from the document model. 
    If Microsoft.Ink.ContextNodeType.UnclassifiedInk _
        <> e.NodeToBeDeleted.Type Then 

        Me.theDocumentModel.RemoveNode(e.NodeToBeDeleted)
    End If 

End Sub 'RemoveContextNode

Windows 7, Windows Vista, Windows Server 2008 R2, Windows Server 2008

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.

.NET Framework

Supported in: 3.0

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