ContextNode 類別

表示在筆墨分析中所建立物件之樹狀目錄的節點。

命名空間：  System.Windows.Ink
組件：  IAWinFX (在 IAWinFX.dll 中)

語法

'宣告
Public Class ContextNode
'用途
Dim instance As ContextNode

public class ContextNode

public ref class ContextNode

public class ContextNode

public class ContextNode

備註

在 InkAnalyzer 執行筆墨分析之後，它會以 ContextNode 物件的樹狀目錄表示結果。RootNode 位於樹狀目錄頂端；越往樹狀目錄的下層，表示越小的筆劃集合。這些節點可以是文字群組 (例如段落或行)、已分析的筆墨 (例如文字或繪圖) 或其他各種型別 (如需完整的清單，請參閱 ContextNodeType 類別)。

您可以手動將節點 (例如 AnalysisHintNode、ImageNode 和 TextWordNode 物件) 加入至 InkAnalyzer。

在輸入損毀的情況下，這個方法會擲回 ArgumentException 例外狀況。

範例

這個範例會採用名為 theInkAnalyzer 的 InkAnalyzer，並且使用其 ContextNode 樹狀目錄填滿名為 theTreeView 的 [System.Windows.Controls.TreeView]。已選取屬於樹狀檢視的節點時，其相關筆劃會設定以紅色顯示。[System.Windows.FrameworkElement.Tag] 屬性是用來對應樹狀目錄節點及其所表示的內容節點。

Private Sub BuildTree() 
    ' Remove the old nodes from the TreeView and add the current results.
    Me.theResultsTreeView.Items.Clear()

    Dim rootNode As New TreeViewItem()
    rootNode.Tag = Me.theInkAnalyzer.RootNode
    rootNode.Header = theInkAnalyzer.RootNode.ToString()

    Me.theResultsTreeView.Items.Add(rootNode)

    WalkTree(Me.theInkAnalyzer.RootNode, rootNode)

End Sub 'BuildTree


Private Shared Sub WalkTree(ByVal parentContextNode As ContextNode, ByVal parentTreeNode As TreeViewItem) 

    parentTreeNode.IsExpanded = True

    For Each theContextSubnode As ContextNode In parentContextNode.SubNodes
        Dim newTreeNode As New TreeViewItem()
        newTreeNode.Header = theContextSubnode.ToString()

        If TypeOf theContextSubnode Is InkWordNode Then
            newTreeNode.Header += ": " + CType(theContextSubnode, InkWordNode).GetRecognizedString()
        ElseIf TypeOf theContextSubnode Is InkDrawingNode Then
            newTreeNode.Header += ": " + CType(theContextSubnode, InkDrawingNode).GetShapeName()
        End If

        ' If the context node is confirmed, add a note to the
        ' tree view item.
        If (theContextSubnode.IsConfirmed(ConfirmationType.NodeTypeAndProperties)) Then

            newTreeNode.Header += " Confirmed."
        End If


        ' Add the context node as a tag of the tree view item and
        ' add the new tree view item to the parent node.
        newTreeNode.Tag = theContextSubnode
        parentTreeNode.Items.Add(newTreeNode)

        WalkTree(theContextSubnode, newTreeNode)
    Next theContextSubnode

End Sub 'WalkTree

Sub theResultsTreeView_SelectedItemChanged(ByVal sender As Object, _
                                           ByVal e As RoutedPropertyChangedEventArgs(Of Object))
    Dim selectedTreeViewItem As TreeViewItem = e.NewValue '

    If selectedTreeViewItem Is Nothing Then
        Return
    End If

    ' Get the context node
    Dim selectedNode As ContextNode = CType(selectedTreeViewItem.Tag, ContextNode)

    MarkNodeAsRed(selectedNode)

    timeStampLabel.Content = ""

    ' Show selected results
    If Not (selectedNode Is Nothing) Then
        If selectedNode.Type = ContextNodeType.WritingRegion Then
            Dim writingRegion As WritingRegionNode = CType(selectedNode, WritingRegionNode)
            selectedResultsTextBox.Text = writingRegion.GetRecognizedString()
        ElseIf selectedNode.Type = ContextNodeType.Paragraph Then
            Dim paragraph As ParagraphNode = CType(selectedNode, ParagraphNode)
            selectedResultsTextBox.Text = paragraph.GetRecognizedString()
        ElseIf selectedNode.Type = ContextNodeType.Line Then
            Dim line As LineNode = CType(selectedNode, LineNode)
            selectedResultsTextBox.Text = line.GetRecognizedString()
        ElseIf selectedNode.Type = ContextNodeType.InkWord Then
            Dim inkWord As InkWordNode = CType(selectedNode, InkWordNode)
            Dim parentNode As ContextNode = inkWord.ParentNode
            If TypeOf parentNode Is LineNode Then
                Dim parentLine As LineNode = CType(parentNode, LineNode)
                ' Put parent line's recognized string into the text box
                selectedResultsTextBox.Text = parentLine.GetRecognizedString()

                ' Select the text that corresponds to the ink word
                Dim subNodes As New ContextNodeCollection(theInkAnalyzer)
                subNodes.Add(inkWord)
                Dim start As Integer
                Dim length As Integer
                parentLine.GetTextRangeFromNodes(subNodes, start, length)
                If start >= 0 AndAlso length > 0 Then
                    selectedResultsTextBox.Select(start, length)
                End If
            End If
        ElseIf selectedNode.Type = ContextNodeType.InkDrawing Then
            Dim drawingNode As InkDrawingNode = CType(selectedNode, InkDrawingNode)
            selectedResultsTextBox.Text = drawingNode.GetShapeName()
        ElseIf selectedNode.Type = ContextNodeType.InkBullet Then
            Dim bulletNode As InkBulletNode = CType(selectedNode, InkBulletNode)
            selectedResultsTextBox.Text = bulletNode.GetRecognizedString()
        ElseIf selectedNode.Type = ContextNodeType.CustomRecognizer Then
            Dim customRecognizer As CustomRecognizerNode = CType(selectedNode, CustomRecognizerNode)
            selectedResultsTextBox.Text = customRecognizer.GetRecognizedString()
        ElseIf selectedNode.Type = ContextNodeType.Object Then
            Dim selectedObject As ObjectNode = CType(selectedNode, ObjectNode)
            selectedResultsTextBox.Text = selectedObject.GetRecognizedString()
        Else
            selectedResultsTextBox.Text = ""
        End If
        If TypeOf selectedNode Is InkWordNode Then
            Dim inkWord As InkWordNode = CType(selectedNode, InkWordNode)

            ' Show the time stamp
            If inkWord.ContainsPropertyData(Me.timeStampGuid) Then
                Dim timeStamp As DateTime = CType(inkWord.GetPropertyData(Me.timeStampGuid), DateTime)
                timeStampLabel.Content = timeStamp.ToShortTimeString()
            End If
            ' Snippet to demonstrate GetPropertyDataIds
            Dim propertyDataIds As Guid() = inkWord.GetPropertyDataIds()
            ' Snippets to demonstrate loading and saving
            Dim data As Byte() = inkWord.SavePropertiesData()
            If Not inkWord.LoadPropertiesData(data) Then
                MessageBox.Show("Cannot load property data")
            End If
        End If
    End If
    PopulateLinksList(selectedNode)
    Me.currentNode = selectedNode
End Sub

Private Sub PopulateLinksList(ByVal selectedNode As ContextNode)

    linksListBox.Items.Clear()

    If selectedNode Is Nothing Then
        Return
    End If

    Dim link As ContextLink
    For Each link In selectedNode.Links
        linksListBox.Items.Add(link.SourceNode.ToString() + ", " & _
                                    link.DestinationNode.ToString() & ": " & _
                                    link.LinkDirection.ToString())
    Next
End Sub

Sub MarkNodeAsRed(ByVal selectedNode As ContextNode)
    ' Set all node strokes to black, but this one to red
    Dim stroke As Stroke
    For Each stroke In Me.theInkCanvas.Strokes
        If Not (selectedNode Is Nothing) AndAlso selectedNode.Strokes.Contains(stroke) Then
            stroke.DrawingAttributes.Color = Colors.Red
        Else
            stroke.DrawingAttributes.Color = Me.theInkCanvas.DefaultDrawingAttributes.Color
        End If
    Next stroke

End Sub 'theResultsTreeView_SelectedItemChanged 

private void BuildTree()
{
    // Remove the old nodes from the TreeView and add the current results.
    this.theResultsTreeView.Items.Clear();

    TreeViewItem rootNode = new TreeViewItem();
    rootNode.Tag = this.theInkAnalyzer.RootNode;
    rootNode.Header = theInkAnalyzer.RootNode.ToString();

    this.theResultsTreeView.Items.Add(rootNode);

    WalkTree(this.theInkAnalyzer.RootNode, rootNode);

}

private static void WalkTree(ContextNode parentContextNode, TreeViewItem parentTreeNode)
{
    // Expand the current TreeViewItem.
    parentTreeNode.IsExpanded = true;

    foreach (ContextNode theContextSubnode
        in parentContextNode.SubNodes)
    {
        TreeViewItem newTreeNode = new TreeViewItem();
        newTreeNode.Header = theContextSubnode.ToString();

        if (theContextSubnode is InkWordNode)
        {
            newTreeNode.Header += ": " +
                ((InkWordNode)theContextSubnode).GetRecognizedString();
        }
        else if (theContextSubnode is InkDrawingNode)
        {
            newTreeNode.Header += ": " +
                ((InkDrawingNode)theContextSubnode).GetShapeName();
        }

        // If the context node is confirmed, add a note to the
        // tree view item.
        if (theContextSubnode.IsConfirmed(ConfirmationType.NodeTypeAndProperties))
        {
            newTreeNode.Header += " Confirmed.";
        }

        // Add the context node as a tag of the tree view item and
        // add the new tree view item to the parent node.
        newTreeNode.Tag = theContextSubnode;
        parentTreeNode.Items.Add(newTreeNode);

        WalkTree(theContextSubnode, newTreeNode);
    }
}


void theResultsTreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
    TreeViewItem selectedTreeViewItem = e.NewValue as TreeViewItem;

    if (selectedTreeViewItem == null)
    {
        return;
    }

    // Get the context node
    ContextNode selectedNode = (ContextNode)selectedTreeViewItem.Tag;

    MarkNodeAsRed(selectedNode);

    timeStampLabel.Content = "";

    // Show selected results
    if (selectedNode != null)
    {
        if (selectedNode.Type == ContextNodeType.WritingRegion)
        {
            WritingRegionNode writingRegion = (WritingRegionNode)selectedNode;
            selectedResultsTextBox.Text = writingRegion.GetRecognizedString();
        }
        else if (selectedNode.Type == ContextNodeType.Paragraph)
        {
            ParagraphNode paragraph = (ParagraphNode)selectedNode;
            selectedResultsTextBox.Text = paragraph.GetRecognizedString();
        }
        else if (selectedNode.Type == ContextNodeType.Line)
        {
            LineNode line = (LineNode)selectedNode;
            selectedResultsTextBox.Text = line.GetRecognizedString();
        }
        else if (selectedNode.Type == ContextNodeType.InkWord)
        {
            InkWordNode inkWord = (InkWordNode)selectedNode;
            ContextNode parentNode = inkWord.ParentNode;
            if (parentNode is LineNode)
            {
                LineNode parentLine = (LineNode)parentNode;
                // Put parent line's recognized string into the text box
                selectedResultsTextBox.Text = parentLine.GetRecognizedString();

                // Select the text that corresponds to the ink word
                ContextNodeCollection subNodes = new ContextNodeCollection(theInkAnalyzer);
                subNodes.Add(inkWord);
                int start;
                int length;
                parentLine.GetTextRangeFromNodes(subNodes, out start, out length);
                if (start >= 0 && length > 0)
                {
                    selectedResultsTextBox.Select(start, length);
                }
            }
        }
        else if (selectedNode.Type == ContextNodeType.InkDrawing)
        {
            InkDrawingNode drawingNode = (InkDrawingNode)selectedNode;
            selectedResultsTextBox.Text = drawingNode.GetShapeName();
        }
        else if (selectedNode.Type == ContextNodeType.InkBullet)
        {
            InkBulletNode bulletNode = (InkBulletNode)selectedNode;
            selectedResultsTextBox.Text = bulletNode.GetRecognizedString();
        }
        else if (selectedNode.Type == ContextNodeType.CustomRecognizer)
        {
            CustomRecognizerNode customRecognizer = (CustomRecognizerNode)selectedNode;
            selectedResultsTextBox.Text = customRecognizer.GetRecognizedString();
        }
        else if (selectedNode.Type == ContextNodeType.Object)
        {
            ObjectNode selectedObject = (ObjectNode)selectedNode;
            selectedResultsTextBox.Text = selectedObject.GetRecognizedString();
        }
        else
        {
            selectedResultsTextBox.Text = "";
        }

        if (selectedNode is InkWordNode)
        {
            InkWordNode inkWord = (InkWordNode)selectedNode;

            // Show the time stamp
            if (inkWord.ContainsPropertyData(this.timeStampGuid))
            {
                DateTime timeStamp =
                    (DateTime)inkWord.GetPropertyData(this.timeStampGuid);
                timeStampLabel.Content = timeStamp.ToShortTimeString();
            }

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

    }
    PopulateLinksList(selectedNode);
    this.currentNode = selectedNode;
}

private void PopulateLinksList(ContextNode selectedNode)
{
    linksListBox.Items.Clear();
    if (selectedNode == null)
    {
        return;
    }

    foreach (ContextLink link in selectedNode.Links)
    {
        linksListBox.Items.Add(link.SourceNode.ToString() + ", " +
                                    link.DestinationNode.ToString() + ": " +
                                    link.LinkDirection.ToString());
    }
}

private void MarkNodeAsRed(ContextNode selectedNode)
{
    // Set all node strokes to black, but this one to red
    foreach (Stroke stroke in this.theInkCanvas.Strokes)
    {
        if (selectedNode != null &&
            selectedNode.Strokes.Contains(stroke))
            stroke.DrawingAttributes.Color = Colors.Red;
        else
            stroke.DrawingAttributes.Color = 
                this.theInkCanvas.DefaultDrawingAttributes.Color;
    }
}

繼承階層架構

System.Object
  System.Windows.Ink.ContextNode
    System.Windows.Ink.AnalysisHintNode
    System.Windows.Ink.CustomRecognizerNode
    System.Windows.Ink.ImageNode
    System.Windows.Ink.InkBulletNode
    System.Windows.Ink.InkDrawingNode
    System.Windows.Ink.InkWordNode
    System.Windows.Ink.LineNode
    System.Windows.Ink.ObjectNode
    System.Windows.Ink.ParagraphNode
    System.Windows.Ink.RootNode
    System.Windows.Ink.TextWordNode
    System.Windows.Ink.UnclassifiedInkNode
    System.Windows.Ink.WritingRegionNode

執行緒安全

這個型別的任何 Public static (在 Visual Basic 中為 Shared) 成員都具備執行緒安全。並非所有的執行個體成員都是安全執行緒。

平台

Windows Vista

.NET Framework 和 .NET Compact Framework 並不支援各種平台的所有版本。如需支援平台版本的相關資訊，請參閱 .NET Framework 系統需求。

版本資訊

.NET Framework

支援版本：3.0

請參閱

參考

ContextNode 成員

System.Windows.Ink 命名空間

InkAnalyzer.Analyze

InkAnalyzer.RootNode

System.Windows.Ink.ContextNodeType