InkAnalyzer.InkAnalyzerStateChanging Event

Article
10/19/2012

Occurs before the InkAnalyzer reconciles analysis results so that an application can synchronize data with the InkAnalyzer.

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

Syntax

'Declaration
Public Event InkAnalyzerStateChanging As InkAnalyzerStateChangingEventHandler
'Usage
Dim instance As InkAnalyzer 
Dim handler As InkAnalyzerStateChangingEventHandler 

AddHandler instance.InkAnalyzerStateChanging, handler

public event InkAnalyzerStateChangingEventHandler InkAnalyzerStateChanging

public:
 event InkAnalyzerStateChangingEventHandler^ InkAnalyzerStateChanging {
    void add (InkAnalyzerStateChangingEventHandler^ value);
    void remove (InkAnalyzerStateChangingEventHandler^ value);
}

JScript does not support events.

Remarks

Use this event when your application maintains its own data structure, which is synchronized with that of the InkAnalyzer. When the InkAnalyzer raises the InkAnalyzerStateChanging event, your application should populate the SubNodes property of the InkAnalyzer object's RootNode. During the reconcile phase, the InkAnalyzer uses this information as it parses and performs recognition of the ink.

The InkAnalyzer raises this event after it raises the ReadyToReconcile event. It raises this event only while performing background analysis.

Lock your data structure when the ink analyzer raises the InkAnalyzerStateChanging event. Changes to your data structure during this phase of analysis can cause errors in ink analysis and synchronization. You can unlock your data structure when the ink analyzer raises the IntermediateResults or Results event.

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

Examples

This example defines a method, AttachDataProxyEventHandlers, that attaches data proxy event handlers to an InkAnalyzer named 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.ReparentStrokes
    AddHandler Me.theInkAnalyzer.IntermediateResultsUpdated, AddressOf Me.ResultsAvailable
    AddHandler Me.theInkAnalyzer.ResultsUpdated, AddressOf Me.ResultsAvailable

End Sub 'AttachDataProxyEventHandlers

       private void 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 (this.theDocumentModel.SupportsOnDemandDataProxy)
            {
                this.theInkAnalyzer.PopulateContextNode +=
                    new PopulateContextNodeEventHandler(
                        this.PopulateContextNode);
            }

            // Add the other data proxy related event handlers. These events are raised 
            // by the InkAnalyzer to communicate ink analysis results to the document model. 
            this.theInkAnalyzer.ContextNodeCreated +=
                new ContextNodeCreatedEventHandler(
                    this.AddContextNode);
            this.theInkAnalyzer.ContextNodeDeleting +=
                new ContextNodeDeletingEventHandler(
                    this.RemoveContextNode);
            this.theInkAnalyzer.ContextNodeLinkAdding +=
                new ContextNodeLinkAddingEventHandler(
                    this.AddContextNodeLink);
            this.theInkAnalyzer.ContextNodeLinkDeleting +=
                new ContextNodeLinkDeletingEventHandler(
                    this.RemoveContextNodeLink);
            this.theInkAnalyzer.ContextNodeMovingToPosition +=
                new ContextNodeMovingToPositionEventHandler(
                    this.MoveContextNodeToPosition);
            this.theInkAnalyzer.ContextNodePropertiesUpdated +=
                new ContextNodePropertiesUpdatedEventHandler(
                    this.UpdateContextNodeProperties);
            this.theInkAnalyzer.ContextNodeReparenting +=
                new ContextNodeReparentingEventHandler(
                    this.ReparentContextNode);
            this.theInkAnalyzer.InkAnalyzerStateChanging +=
                new InkAnalyzerStateChangingEventHandler(
                    this.InkAnalyzer_StateChanging);
            this.theInkAnalyzer.StrokesReparented +=
                new StrokesReparentedEventHandler(
                    this.ReparentStrokes);
            this.theInkAnalyzer.IntermediateResultsUpdated +=
                new ResultsUpdatedEventHandler(
                    this.ResultsAvailable);
            this.theInkAnalyzer.ResultsUpdated +=
                new ResultsUpdatedEventHandler(
                    this.ResultsAvailable);
        }

The following example defines the method, InkAnalyzer_StateChanging, that handles the InkAnalyzerStateChanging event. The event information is passed to the document model object named 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.InkAnalyzerStateChanging event. 
'/ </summary> 
'/ <param name="sender">The source of the event.</param> 
'/ <param name="e">The event data.</param> 
Private Sub InkAnalyzer_StateChanging(ByVal sender As Object, ByVal e As System.EventArgs) 
    Me.theDocumentModel.BeginReconcilePhase()

End Sub 'InkAnalyzer_StateChanging

/// <summary> 
/// Handles the InkAnalyzer.InkAnalyzerStateChanging event. 
/// </summary> 
/// <param name="sender">The source of the event.</param>
/// <param name="e">The event data.</param>
private void InkAnalyzer_StateChanging(object sender, System.EventArgs e)
{
    this.theDocumentModel.BeginReconcilePhase();
}

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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