InkAnalyzer.ContextNodeDeleting 事件

项目
11/04/2008

命名空间： System.Windows.Ink
程序集： IAWinFX（在 IAWinFX.dll 中）

语法

声明
Public Event ContextNodeDeleting As ContextNodeDeletingEventHandler
用法
Dim instance As InkAnalyzer
Dim handler As ContextNodeDeletingEventHandler

AddHandler instance.ContextNodeDeleting, handler

public event ContextNodeDeletingEventHandler ContextNodeDeleting

public:
 event ContextNodeDeletingEventHandler^ ContextNodeDeleting {
    void add (ContextNodeDeletingEventHandler^ value);
    void remove (ContextNodeDeletingEventHandler^ value);
}

/** @event */
public void add_ContextNodeDeleting (ContextNodeDeletingEventHandler value)
/** @event */
public void remove_ContextNodeDeleting (ContextNodeDeletingEventHandler value)

JScript 不支持事件。

备注

如果您的应用程序维护其自己的数据结构（该数据结构与 InkAnalyzer 的数据结构同步），请使用此事件。在墨迹分析的协调阶段中，或在 InkAnalyzer 方法删除 ContextNode 时，将发生此事件。

在 InkAnalyzer 删除 ContextNode 之前，InkAnalyzer 将从 ContextNode 移除所有笔画，并移除指向其他 ContextNode 对象的所有链接。在移除 ContextNode 之前，InkAnalyzer 可引发以下事件。

从 ContextNode 移动笔画时引发 StrokesReparented 事件。
从 ContextNode 移除 ContextLink 之前引发 ContextNodeLinkDeleting 事件。

有关将应用程序数据与 InkAnalyzer 同步的更多信息，请参见Data Proxy with Ink Analysis。

示例

此示例定义 AttachDataProxyEventHandlers 方法，该方法将数据代理事件处理程序附加到一个名为 theInkAnalyzer 的 InkAnalyzer。

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);
        }

下面的示例定义 RemoveContextNode 方法，用以处理 ContextNodeDeleting 事件。事件信息将传递给文档模型对象 theDocumentModel。

此示例不提供文档模型的定义，也不演示文档模型如何处理传入的信息。

'/ <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 ContextNodeDeletingEventArgs) 
    ' Do not remove unclassified ink nodes from the document model.
    If ContextNodeType.UnclassifiedInk <> e.NodeToBeDeleted.Type Then
        Me.theDocumentModel.RemoveNode(e.NodeToBeDeleted)
    End If

End Sub 'RemoveContextNode

        /// <summary>
        /// Handles the InkAnalyzer.ContextNodeDeleting event.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The event data.</param>
        private void RemoveContextNode(
            object sender, ContextNodeDeletingEventArgs e)
        {
            // Do not remove unclassified ink nodes from the document model.
            if (ContextNodeType.UnclassifiedInk
                != e.NodeToBeDeleted.Type)
            {
                this.theDocumentModel.RemoveNode(e.NodeToBeDeleted);
            }
        }