ContextNodeBase 类

表示在墨迹分析过程中创建的对象树中的一个节点。

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

语法

声明
Public Class ContextNodeBase
用法
Dim instance As ContextNodeBase

public class ContextNodeBase

public ref class ContextNodeBase

public class ContextNodeBase

public class ContextNodeBase

示例

此示例获取名为 theInkAnalyzer 的 InkAnalyzerBase，并使用其 ContextNodeBase 树来填充名为 theTreeView 的 System.Windows.Forms.TreeView。当选中树视图中的某个节点时，这些笔画将设置为以红色显示。Tag 属性用于在树节点和它们所表示的上下文节点之间进行映射。

Private Sub BuildTree()
    Me.theTreeView.Nodes.Clear()
    Dim rootNode As New TreeNode(Me.theInkAnalyzerBase.RootNode.ToString())
    Me.theTreeView.Nodes.Add(rootNode)
    rootNode.Tag = Me.theInkAnalyzerBase.RootNode

    WalkTree(Me.theInkAnalyzerBase.RootNode, rootNode)

End Sub 'BuildTree


Private Sub WalkTree(ByVal parentContextNode As ContextNodeBase, ByVal parentTreeNode As TreeNode)

    Dim cNode As ContextNodeBase

    For Each cNode In parentContextNode.SubNodes

        Dim newTNode As New TreeNode(cNode.ToString())

        If cNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkWord AndAlso _
           cNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.RecognizedString) Then

            newTNode.Text = newTNode.Text + _
                ": " + CType(cNode.GetPropertyData(PropertyGuidsForContextNodesBase.RecognizedString), _
                String)

        ElseIf cNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkDrawing AndAlso _
               cNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.ShapeName) Then

            Dim shapeName As String = CType(cNode.GetPropertyData(PropertyGuidsForContextNodesBase.ShapeName), _
                String)

            If shapeName <> "" Then
                newTNode.Text = newTNode.Text + ": " + shapeName
            End If

        End If

        WalkTree(cNode, newTNode)
        parentTreeNode.Nodes.Add(newTNode)

        ' Add the context node as a tag of the tree node
        newTNode.Tag = cNode
    Next cNode

End Sub 'WalkTree

Private Sub theTreeView_AfterSelect(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles theTreeView.AfterSelect
    ' Get the context node
    Dim selectedNode As ContextNodeBase = CType(e.Node.Tag, ContextNodeBase)

    MarkNodeAsRed(selectedNode)

    timeStampLabel.Text = ""

    ' Show selected results
    If Not (selectedNode Is Nothing) Then

        If (selectedNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.RecognizedString) AndAlso _
           (selectedNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.WritingRegion OrElse _
            selectedNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.Paragraph OrElse _
            selectedNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.CustomRecognizer OrElse _
            selectedNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.Object OrElse _
            selectedNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.Line)) Then

            selectedResultsTextBox.Text = _
                CType(selectedNode.GetPropertyData(PropertyGuidsForContextNodesBase.RecognizedString), String)

        ElseIf (selectedNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkWord) Then
            Dim parentNode As ContextNodeBase = selectedNode.ParentNode
            If (parentNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.Line AndAlso _
                    parentNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.RecognizedString)) Then

                ' Put parent line's recognized string into the text box
                selectedResultsTextBox.Text = _
                    CType(parentNode.GetPropertyData(PropertyGuidsForContextNodesBase.RecognizedString), String)

                ' Select the text that corresponds to the ink word
                Dim subNodes As New ContextNodeBaseCollection(theInkAnalyzerBase)
                subNodes.Add(selectedNode)
                Dim start As Integer
                Dim length As Integer
                theInkAnalyzerBase.GetTextRangeFromNodes(subNodes, start, length)
                If (start >= 0 AndAlso length > 0) Then
                    selectedResultsTextBox.Select(start, length)
                End If
            End If
        ElseIf (selectedNode.Type = System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkDrawing AndAlso _
                selectedNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.ShapeName)) Then

            selectedResultsTextBox.Text = _
                CType(selectedNode.GetPropertyData(PropertyGuidsForContextNodesBase.ShapeName), String)

        End If
    End If

    Me.currentNode = selectedNode

End Sub 'theTreeView_AfterSelect


Private Sub MarkNodeAsRed(ByVal selectedNode As ContextNodeBase)
    Dim selectedNodeStrokes As Strokes = Nothing

    If Not selectedNode Is Nothing Then
        selectedNodeStrokes = theInk.CreateStrokes(selectedNode.GetStrokeIds())
    End If

    ' Set all node strokes to black, but this one to red
    Dim stroke As Stroke
    For Each stroke In Me.theInkCollector.Ink.Strokes
        If (Not selectedNodeStrokes Is Nothing And _
                selectedNodeStrokes.Contains(stroke)) Then

            stroke.DrawingAttributes = New DrawingAttributes(Color.Red)
        Else
            stroke.DrawingAttributes = Me.theInkCollector.DefaultDrawingAttributes
        End If
    Next

    theNotesPanel.Refresh()
End Sub

private void BuildTree()
{
    this.theTreeView.Nodes.Clear();
    TreeNode rootNode =
        new TreeNode(this.theInkAnalyzerBase.RootNode.ToString());
    this.theTreeView.Nodes.Add(rootNode);
    rootNode.Tag = this.theInkAnalyzerBase.RootNode;

    WalkTree(this.theInkAnalyzerBase.RootNode, rootNode);
}

private void WalkTree(
    System.Windows.Ink.AnalysisCore.ContextNodeBase parentContextNode, TreeNode parentTreeNode)
{
    foreach (ContextNodeBase cNode in parentContextNode.SubNodes)
    {
        TreeNode newTNode = new TreeNode(cNode.ToString());
        if ((cNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkWord) &&
             cNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.RecognizedString))
        {
            // Get the recognized string
            newTNode.Text += ": " +
                (string)cNode.GetPropertyData(PropertyGuidsForContextNodesBase.RecognizedString);
        }
        else if ((cNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkDrawing) &&
                  cNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.ShapeName))
        {
            newTNode.Text += ": " +
                (string)cNode.GetPropertyData(PropertyGuidsForContextNodesBase.ShapeName);
        }
        WalkTree(cNode, newTNode);
        parentTreeNode.Nodes.Add(newTNode);

        // Add the context node as a tag of the tree node
        newTNode.Tag = cNode;
    }
}

private void theTreeView_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
    // Get the context node
    ContextNodeBase selectedNode = (ContextNodeBase)e.Node.Tag;

    MarkNodeAsRed(selectedNode);

    timeStampLabel.Text = "";

    // Show selected results
    if (selectedNode != null)
    {
        if (selectedNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.RecognizedString) &&
           (selectedNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.WritingRegion ||
            selectedNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.Paragraph ||
            selectedNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.CustomRecognizer ||
            selectedNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.Object ||
            selectedNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.Line))
        {
            selectedResultsTextBox.Text =
                (string)selectedNode.GetPropertyData(PropertyGuidsForContextNodesBase.RecognizedString);
        }
        else if (selectedNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkWord)
        {
            ContextNodeBase parentNode = selectedNode.ParentNode;
            if (parentNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.Line &&
                parentNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.RecognizedString))
            {
                // Put parent line's recognized string into the text box
                selectedResultsTextBox.Text =
                    (string)parentNode.GetPropertyData(PropertyGuidsForContextNodesBase.RecognizedString);

                // Select the text that corresponds to the ink word
                ContextNodeBaseCollection subNodes = new ContextNodeBaseCollection(theInkAnalyzerBase);
                subNodes.Add(selectedNode);
                int start;
                int length;
                theInkAnalyzerBase.GetTextRangeFromNodes(subNodes, out start, out length);
                if (start >= 0 && length > 0)
                {
                    selectedResultsTextBox.Select(start, length);
                }
            }
        }
        else if (selectedNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkDrawing &&
                 selectedNode.ContainsPropertyData(PropertyGuidsForContextNodesBase.ShapeName))
        {
            selectedResultsTextBox.Text =
                (string)selectedNode.GetPropertyData(PropertyGuidsForContextNodesBase.ShapeName);

        }

        if (selectedNode.Type == System.Windows.Ink.AnalysisCore.ContextNodeTypeBase.InkWord)
        {
            // Show the time stamp
            if (selectedNode.ContainsPropertyData(this.timeStampGuid))
            {
                DateTime timeStamp =
                    (DateTime)selectedNode.GetPropertyData(this.timeStampGuid);
                timeStampLabel.Text = timeStamp.ToShortTimeString();
            }

            // Snippet to demonstrate GetPropertyDataIds
            Guid[] propertyDataIds = selectedNode.GetPropertyDataIds();
            // Snippets to demonstrate loading and saving
            byte[] data = selectedNode.SavePropertiesData();
            if (!selectedNode.LoadPropertiesData(data))
                MessageBox.Show("Cannot load property data");
        }
    }
    this.currentNode = selectedNode;
}

private void MarkNodeAsRed(ContextNodeBase selectedNode)
{
    Strokes selectedNodeStrokes = null;

    if (selectedNode != null)
    {
        selectedNodeStrokes = theInk.CreateStrokes(selectedNode.GetStrokeIds());
    }

    // Set all node strokes to black, but this one to red
    foreach (Stroke stroke in this.theInkCollector.Ink.Strokes)
    {
        if (selectedNodeStrokes != null &&
            selectedNodeStrokes.Contains(stroke))
            stroke.DrawingAttributes = new DrawingAttributes(Color.Red);
        else
            stroke.DrawingAttributes = this.theInkCollector.DefaultDrawingAttributes;
    }

    theNotesPanel.Refresh();
}

继承层次结构

System.Object
  System.Windows.Ink.AnalysisCore.ContextNodeBase

线程安全

此类型的任何公共 static（在 Visual Basic 中为 Shared） 成员都是线程安全的。但不保证所有实例成员都是线程安全的。

平台

Windows Vista, Windows XP SP2, Windows Server 2003

.NET Framework 和 .NET Compact Framework 并不是对每个平台的所有版本都提供支持。有关支持的版本的列表，请参见.NET Framework 系统要求。

版本信息

.NET Framework

受以下版本支持：3.0

另请参见

参考

ContextNodeBase 成员

System.Windows.Ink.AnalysisCore 命名空间

System.Windows.Ink.AnalysisCore.ContextNodeBase