LineNode.GetNodesFromTextRange Method (Int32%, Int32%)

Článek
10/19/2012

Returns a collection of descendant ContextNode objects that are relevant to 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 LineNode 
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 function GetNodesFromTextRange(
    start : int, 
    length : int
) : ContextNodeCollection

Parameters

start
Type: System.Int32%

The start of the text range in the recognized string.

length
Type: System.Int32%

The length of the text range in the recognized string.

Return Value

Type: System.Windows.Ink.ContextNodeCollection
The collection of descendant ContextNode objects that are relevant to the specified text range in the recognized string.

Remarks

The specified text range should be relative to the recognized string of the current LineNode and not the recognized string of the entire RootNode.

The start and length parameters are references because their values can be changed. For example, if the return value of GetRecognizedString is "I am late" and you pass in values of start = 6 and length = 1, corresponding to the letter "a," then the ContextNodeCollection is likely to have just one ContextNode, which is the InkWordNode that corresponds to the word "late." In this case, the value of start is changed to 5 and the value of length is changed to 4, corresponding to the entire word "late."

Examples

The following example takes a TextBox, selectedResultsTextBox, which Text property has been set previously to the value returned by GetRecognizedString for a LineNode, line. The user has selected some text in the [System.Windows.Controls.TextBox]. The example code takes the selection and marks the Strokes that corresponds to that selection.

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

' Return if no text is selected. 
If length = 0 Then 
    Return 
End If  

' Get the nodes that correspond to that range 
Dim selectedNodes As ContextNodeCollection = _
    line.GetNodesFromTextRange(start, length)

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

' Color the strokes red if part of the selected words. 
' Otherwise, color them black. 
For Each node As ContextNode In line.SubNodes
    For Each stroke As Stroke In node.Strokes
        If selectedNodes.Contains(node) Then
            stroke.DrawingAttributes.Color = Colors.Red
        Else
            stroke.DrawingAttributes.Color = Colors.Black
        End If 
    Next stroke
Next node

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

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

// Get the nodes that correspond to that range
ContextNodeCollection selectedNodes =
    line.GetNodesFromTextRange(ref start, ref length);

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

// Color the strokes red if part of the selected words. 
// Otherwise, color them black. 
foreach (ContextNode node in line.SubNodes)
{
    foreach (Stroke stroke in node.Strokes)
    {
        if (selectedNodes.Contains(node))
        {
            stroke.DrawingAttributes.Color = Colors.Red;
        }
        else
        {
            stroke.DrawingAttributes.Color = Colors.Black;
        }
    }
}

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.0

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