InkAnalyzerBase.ContextNodeDeletingBase 事件

项目
11/04/2008

在墨迹分析器删除 ContextNodeBase 之前发生。

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

语法

声明
Public Event ContextNodeDeletingBase As ContextNodeDeletingBaseEventHandler
用法
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)

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 InkAnalyzerBase 的数据结构同步），请使用此事件。在墨迹分析的协调阶段中，或是在响应用于删除 ContextNodeBase 的墨迹分析方法时，将发生此事件。

在墨迹分析器删除某个上下文节点之前，分析器从该上下文节点移除所有笔画，并移除到其他上下文节点的链接。在移除上下文节点之前，InkAnalyzerBase 可能引发以下事件。

StrokesReparentedBase 事件，在从 ContextNodeBase 移动笔画时引发。
ContextNodeLinkDeletingBase 事件，在从上下文节点移除 ContextLinkBase 之前引发。
ContextNodeDeletingBase 事件，在移除不再拥有子节点的父上下文节点之前引发。

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

示例

下面的示例定义方法 AttachDataProxyEventHandlers，该方法将数据代理事件处理程序附加到 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);
        }

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

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 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);
            }
        }