InkAnalyzerBase.ContextNodeDeletingBase Event

Article
12/12/2007

Occurs before the ink analyzer deletes a ContextNodeBase.

Namespace: System.Windows.Ink.AnalysisCore
Assembly: IACore (in iacore.dll)

Syntax

'Declaration
Public Event ContextNodeDeletingBase As ContextNodeDeletingBaseEventHandler
'Usage
Dim instance As InkAnalyzerBase
Dim handler As ContextNodeDeletingBaseEventHandler

AddHandler instance.ContextNodeDeletingBase, handler

public event ContextNodeDeletingBaseEventHandler ContextNodeDeletingBase

public:
event ContextNodeDeletingBaseEventHandler^ ContextNodeDeletingBase {
    void add (ContextNodeDeletingBaseEventHandler^ value);
    void remove (ContextNodeDeletingBaseEventHandler^ value);
}

/** @event */
public void add_ContextNodeDeletingBase (ContextNodeDeletingBaseEventHandler value)

/** @event */
public void remove_ContextNodeDeletingBase (ContextNodeDeletingBaseEventHandler value)

In JScript, you can handle the events defined by a class, but you cannot define your own.

Not applicable.

Remarks

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

Before the ink analyzer deletes a context node, the analyzer removes all of the strokes from the context node and removes all of the links to other context nodes. Before the context node is removed, the InkAnalyzerBase may raise the following events.

The StrokesReparentedBase event when it moves a stroke from the ContextNodeBase.
The ContextNodeLinkDeletingBase event before it removes a ContextLinkBase from the context node.
The ContextNodeDeletingBase event before it removes a parent context node that no longer has child nodes.

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

Example

The following example defines a method, AttachDataProxyEventHandlers, that attaches data proxy event handlers to an InkAnalyzerBase, baseInkAnalyzer.

Private Sub AttachDataProxyEventHandlers()
    ' If the document model supports on demand data proxy, then add an
    ' event handler for the PopulateContextNodeBase event. This event is raised
    ' when the InkAnalyzerBase accesses a partially populated ContextNodeBase
    ' created by the document model.
    If Me.baseDocumentModel.SupportsOnDemandDataProxy Then
        AddHandler Me.baseInkAnalyzer.PopulateContextNodeBase, AddressOf Me.PopulateContextNodeBase
    End If

    ' Add the other data proxy related event handlers. These events are raised
    ' by the InkAnalyzer to communicate parsing results to the document model.
    AddHandler Me.baseInkAnalyzer.ContextNodeCreatedBase, _
        AddressOf Me.AddContextNodeBase
    AddHandler Me.baseInkAnalyzer.ContextNodeDeletingBase, _
        AddressOf Me.RemoveContextNodeBase
    AddHandler Me.baseInkAnalyzer.ContextNodeLinkAddingBase, _
        AddressOf Me.AddContextNodeLinkBase
    AddHandler Me.baseInkAnalyzer.ContextNodeLinkDeletingBase, _
        AddressOf Me.RemoveContextNodeLinkBase
    AddHandler Me.baseInkAnalyzer.ContextNodeMovingToPositionBase, _
        AddressOf Me.MoveContextNodeBaseToPosition
    AddHandler Me.baseInkAnalyzer.ContextNodePropertiesUpdatedBase, _
        AddressOf Me.UpdateContextNodeBaseProperties
    AddHandler Me.baseInkAnalyzer.ContextNodeReparentingBase, _
        AddressOf Me.ReparentContextNodeBase
    AddHandler Me.baseInkAnalyzer.InkAnalyzerStateChangingBase, _
        AddressOf Me.InkAnalyzerBase_StateChanging
    AddHandler Me.baseInkAnalyzer.StrokesReparentedBase, _
        AddressOf Me.ReparentStroke
    AddHandler Me.baseInkAnalyzer.IntermediateResultsUpdatedBase, _
        AddressOf Me.BaseResultsAvailable
    AddHandler Me.baseInkAnalyzer.ResultsUpdatedBase, _
        AddressOf Me.BaseResultsAvailable

End Sub 'AttachDataProxyEventHandlers

private void AttachDataProxyEventHandlers()
{
    // If the document model supports on demand data proxy, then add an
    // event handler for the PopulateContextNodeBase event. This event is raised
    // when the InkAnalyzerBase accesses a partially populated ContextNodeBase
    // created by the document model.
    if (this.baseDocumentModel.SupportsOnDemandDataProxy)
    {
        this.baseInkAnalyzer.PopulateContextNodeBase +=
            new System.Windows.Ink.AnalysisCore.PopulateContextNodeBaseEventHandler(
                this.PopulateContextNodeBase);
    }

    // Add the other data proxy related event handlers. These events are raised
    // by the InkAnalyzer to communicate parsing results to the document model.
    this.baseInkAnalyzer.ContextNodeCreatedBase +=
        new System.Windows.Ink.AnalysisCore.ContextNodeCreatedBaseEventHandler(
            this.AddContextNodeBase);
    this.baseInkAnalyzer.ContextNodeDeletingBase +=
        new System.Windows.Ink.AnalysisCore.ContextNodeDeletingBaseEventHandler(
            this.RemoveContextNodeBase);
    this.baseInkAnalyzer.ContextNodeLinkAddingBase +=
        new System.Windows.Ink.AnalysisCore.ContextNodeLinkAddingBaseEventHandler(
            this.AddContextNodeLinkBase);
    this.baseInkAnalyzer.ContextNodeLinkDeletingBase +=
        new System.Windows.Ink.AnalysisCore.ContextNodeLinkDeletingBaseEventHandler(
            this.RemoveContextNodeLinkBase);
    this.baseInkAnalyzer.ContextNodeMovingToPositionBase +=
        new System.Windows.Ink.AnalysisCore.ContextNodeMovingToPositionBaseEventHandler(
            this.MoveContextNodeBaseToPosition);
    this.baseInkAnalyzer.ContextNodePropertiesUpdatedBase +=
        new System.Windows.Ink.AnalysisCore.ContextNodePropertiesUpdatedBaseEventHandler(
            this.UpdateContextNodeBaseProperties);
    this.baseInkAnalyzer.ContextNodeReparentingBase +=
        new System.Windows.Ink.AnalysisCore.ContextNodeReparentingBaseEventHandler(
            this.ReparentContextNodeBase);
    this.baseInkAnalyzer.InkAnalyzerStateChangingBase +=
        new System.Windows.Ink.AnalysisCore.InkAnalyzerStateChangingBaseEventHandler(
            this.InkAnalyzerBase_StateChanging);
    this.baseInkAnalyzer.StrokesReparentedBase +=
        new System.Windows.Ink.AnalysisCore.StrokesReparentedBaseEventHandler(
            this.ReparentStroke);
    this.baseInkAnalyzer.IntermediateResultsUpdatedBase +=
        new System.Windows.Ink.AnalysisCore.ResultsUpdatedBaseEventHandler(
            this.BaseResultsAvailable);
    this.baseInkAnalyzer.ResultsUpdatedBase +=
        new System.Windows.Ink.AnalysisCore.ResultsUpdatedBaseEventHandler(
            this.BaseResultsAvailable);
}

The following example defines the method, RemoveContextNodeBase, that handles the ContextNodeDeletingBase event. The event information is passed to the document model object, baseDocumentModel.

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

''' <summary>
''' Handles the InkAnalyzerBase.ContextNodeDeletingBase event.
''' </summary>
''' <param name="sender">The source of the event.</param>
''' <param name="e">The event data.</param>
Private Sub RemoveContextNodeBase( _
    ByVal sender As Object, _
    ByVal e As System.Windows.Ink.AnalysisCore.ContextNodeDeletingBaseEventArgs)

    ' Do not remove unclassified ink nodes from the document model.
    If System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.UnclassifiedInk <> e.NodeToBeDeleted.Type Then
        Me.baseDocumentModel.RemoveNode(e.NodeToBeDeleted)
    End If

End Sub 'RemoveContextNodeBase

/// <summary>
/// Handles the InkAnalyzerBase.ContextNodeDeletingBase event.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The event data.</param>
private void RemoveContextNodeBase(
    object sender, System.Windows.Ink.AnalysisCore.ContextNodeDeletingBaseEventArgs e)
{
    // Do not remove unclassified ink nodes from the document model.
    if (System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.UnclassifiedInk
        != e.NodeToBeDeleted.Type)
    {
        this.baseDocumentModel.RemoveNode(e.NodeToBeDeleted);
    }
}

Platforms

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

Version Information

.NET Framework

Supported in: 3.0

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