RootNode.GetTextRangeFromNodes Method

Article
12/12/2007

Finds the text range in the recognized string that corresponds to a collection of ContextNode objects that are descendants of the RootNode.

Namespace: System.Windows.Ink
Assembly: IAWinFX (in iawinfx.dll)

Syntax

'Declaration
Public Sub GetTextRangeFromNodes ( _
    subTree As ContextNodeCollection, _
    <OutAttribute> ByRef start As Integer, _
    <OutAttribute> ByRef length As Integer _
)
'Usage
Dim instance As RootNode
Dim subTree As ContextNodeCollection
Dim start As Integer
Dim length As Integer

instance.GetTextRangeFromNodes(subTree, start, length)

public void GetTextRangeFromNodes (
    ContextNodeCollection subTree,
    out int start,
    out int length
)

public:
void GetTextRangeFromNodes (
    ContextNodeCollection^ subTree, 
    [OutAttribute] int% start, 
    [OutAttribute] int% length
)

public void GetTextRangeFromNodes (
    ContextNodeCollection subTree, 
    /** @attribute OutAttribute() */ /** @ref */ int start, 
    /** @attribute OutAttribute() */ /** @ref */ int length
)

Not applicable.

Parameters

subTree
The collection of ContextNode objects that are descendants of the RootNode.

start
The start of the text range.

length
The length of the text range.

Remarks

If the subTree contains a ContextNode object that is not a descendant of the RootNode, then an ArgumentException exception is thrown.

If the subTree parameter contains ContextNode objects that are not consecutive, then the smallest text range that covers all of the ContextNode objects is returned.

Example

The following example takes a RootNode, theRootNode, from an InkAnalyzer, theInkAnalyzer, and finds the last WritingRegionNode by selecting the writing region with the lowest bounds. It then finds the text range that corresponds to the current writing region, puts the value of GetRecognizedString into a TextBox, theResultsTextBox, and selects the text that corresponds to that last writing region.

Dim theRootNode As RootNode = CType(theInkAnalyzer.RootNode, RootNode)
Dim regions As ContextNodeCollection = theInkAnalyzer.FindNodesOfType(ContextNodeType.WritingRegion)
Dim lastRegion As WritingRegionNode = Nothing
Dim maxY As Double = Double.MinValue
Dim region As WritingRegionNode
For Each region In  regions
    If [region].Location.GetBounds().Bottom > maxY Then
        maxY = [region].Location.GetBounds().Bottom
        lastRegion = [region]
    End If
Next region

If lastRegion Is Nothing Then
    Return
End If 
' Create a collection to hold this line
Dim lastRegionCollection As New ContextNodeCollection(theInkAnalyzer)
lastRegionCollection.Add(lastRegion)

' Find corresponding start and length
Dim start, length As Integer
theRootNode.GetTextRangeFromNodes(lastRegionCollection, start, length)

' Select this in the text box
theResultsTextBox.Text = theRootNode.GetRecognizedString()
theResultsTextBox.Select(start, length)

RootNode theRootNode = (RootNode)theInkAnalyzer.RootNode;
ContextNodeCollection regions =
    theInkAnalyzer.FindNodesOfType(ContextNodeType.WritingRegion);
WritingRegionNode lastRegion = null;
double maxY = double.MinValue;
foreach (WritingRegionNode region in regions)
{
    if (region.Location.GetBounds().Bottom > maxY)
    {
        maxY = region.Location.GetBounds().Bottom;
        lastRegion = region;
    }
}

if (lastRegion == null)
    return;

// Create a collection to hold this line
ContextNodeCollection lastRegionCollection =
    new ContextNodeCollection(theInkAnalyzer);
lastRegionCollection.Add(lastRegion);

// Find corresponding start and length
int start, length;
theRootNode.GetTextRangeFromNodes(lastRegionCollection, out start, out length);

// Select this in the text box
theResultsTextBox.Text = theRootNode.GetRecognizedString();
theResultsTextBox.Select(start, length);

Platforms

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.

Version Information

.NET Framework

Supported in: 3.0