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ContextNodeBase Class

Represents a node in a tree of objects that are created as part of ink analysis.

Namespace: System.Windows.Ink.AnalysisCore
Assembly: IACore (in iacore.dll)

public class ContextNodeBase
public class ContextNodeBase
public class ContextNodeBase
Not applicable.

This example takes an InkAnalyzerBase, theInkAnalyzer, and uses its ContextNodeBase tree to fill a System.Windows.Forms.TreeView, theTreeView. When a node in the tree view is selected, those strokes are set to appear in red. The Tag property is used to map between tree nodes and the context nodes that they represent.

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();
}

System.Object
  System.Windows.Ink.AnalysisCore.ContextNodeBase
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0
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