WritingRegionNode.GetNodesFromTextRange Method (Int32, Int32)

아티클
12/12/2007

Returns a collection of descendant ContextNode objects that are from the specified text range in the recognized string.

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

Syntax

'Declaration
Public Function GetNodesFromTextRange ( _
    ByRef start As Integer, _
    ByRef length As Integer _
) As ContextNodeCollection
'Usage
Dim instance As WritingRegionNode
Dim start As Integer
Dim length As Integer
Dim returnValue As ContextNodeCollection

returnValue = instance.GetNodesFromTextRange(start, length)

public ContextNodeCollection GetNodesFromTextRange (
    ref int start,
    ref int length
)

public:
ContextNodeCollection^ GetNodesFromTextRange (
    int% start, 
    int% length
)

public ContextNodeCollection GetNodesFromTextRange (
    /** @ref */ int start, 
    /** @ref */ int length
)

Not applicable.

Parameters

start
The start of the text range in the recognized string.

length
The length of the text range in the recognized string.

Return Value

The collection of descendant ContextNode objects that are relevant to the specified text range in the recognized string.

Remarks

The specified text range is relative to the recognized string of this WritingRegionNode rather than the recognized string of the entire RootNode.

Example

The following example uses the WritingRegionNode method to mark the strokes that corresponds to selected text. The example code assumes that the Text property of the TextBox, theResultsTextBox, is set to the value returned by the GetRecognizedString method and that the user has selected some text in theResultsTextBox. This example also assumes that there is an InkAnalyzer called, theInkAnalyzer.

' Find out what's been selected in the text box
Dim selectionStart As Integer = selectedResultsTextBox.SelectionStart
Dim selectionLength As Integer = selectedResultsTextBox.SelectionLength

' Return if no text is selected.
If selectionLength = 0 Then
    Return
End If 
' Get the nodes that correspond to that range
Dim selectedRegionSubNodes As ContextNodeCollection = writingRegion.GetNodesFromTextRange(selectionStart, selectionLength)


' Use the new start and length value to update the
' selection in the TextBox
selectedResultsTextBox.SelectionStart = selectionStart
selectedResultsTextBox.SelectionLength = selectionLength

' First, set all strokes to black
For Each stroke As Stroke In writingRegion.Strokes
    stroke.DrawingAttributes.Color = Colors.Black
Next stroke

' Next, set all selected sub nodes to red
For Each node As ContextNode In selectedRegionSubNodes
    For Each stroke As Stroke In node.Strokes
        stroke.DrawingAttributes.Color = Colors.Red
    Next stroke
Next node

// Find out what's been selected in the text box
int selectionStart = selectedResultsTextBox.SelectionStart;
int selectionLength = selectedResultsTextBox.SelectionLength;

// Return if no text is selected.
if (selectionLength == 0)
    return;

// Get the nodes that correspond to that range
ContextNodeCollection selectedRegionSubNodes =
        writingRegion.GetNodesFromTextRange(ref selectionStart, ref selectionLength);


// Use the new start and length value to update the
// selection in the TextBox
selectedResultsTextBox.SelectionStart = selectionStart;
selectedResultsTextBox.SelectionLength = selectionLength;

// First, set all strokes to black
foreach (Stroke stroke in writingRegion.Strokes)
    stroke.DrawingAttributes.Color = Colors.Black;
// Next, set all selected sub nodes to red
foreach (ContextNode node in selectedRegionSubNodes)
{
    foreach (Stroke stroke in node.Strokes)
    {
        stroke.DrawingAttributes.Color = Colors.Red;
    }
}

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

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