ParagraphNode.GetNodesFromTextRange Method (Int32%, Int32%, ContextNodeCollection)

Článek
10/19/2012

Returns a ContextNodeCollection that contains descendant ContextNode objects that are relevant to the specified text range in the recognized string within a collection of descendent nodes.

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

Syntax

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

returnValue = instance.GetNodesFromTextRange(start, _
    length, subTree)

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

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

public function GetNodesFromTextRange(
    start : int, 
    length : int, 
    subTree : ContextNodeCollection
) : ContextNodeCollection

Parameters

start
Type: System.Int32%

length
Type: System.Int32%

subTree
Type: System.Windows.Ink.ContextNodeCollection

The descendent ContextNode objects to which to narrow the search.

Return Value

Type: System.Windows.Ink.ContextNodeCollection
A ContextNodeCollection that contains descendant ContextNode objects that are relevant to the specified text range in the recognized string within the collection of descendent nodes.

Remarks

The specified text range should be relative to the subTree part of the recognized string of this ParagraphNode, rather than to the recognized string of the entire [T:System.Windows.Ink. ParagraphNode] or the entire RootNode.

The start and length parameters are reference values that may be changed to specify the entire string associated with the returned ContextNodeCollection. For example, if the return value of GetRecognizedString is "I am late" and you pass in values of start = 6 and length = 1, the parameters correspond to the letter "a." The ContextNodeCollection is then likely to have just one ContextNode, the [T:System.Windows.Ink.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."

Note

The start parameter is relative to the nodes in the subTree parameter. In the previous example, if you pass in a subTree parameter with nodes for "am" and "late," but not "I," then a start parameter of 3 and a length of 4 are the text range for the word "late."

Examples

The following example takes a ContextNodeCollection object, lastLineCollection, which contains one ContextNode object that corresponds to the last line in a ParagraphNode, paragraph. It then marks all of the Strokes in black except for the ones that correspond to the selected text in the last line, which it changes to red.

' Get the nodes that correspond to this start and length 
Dim selectedNodes As ContextNodeCollection = _
    paragraph.GetNodesFromTextRange(start, length, lastLineCollection)

' Set all strokes to black 

For Each stroke As Stroke In paragraph.Strokes
    stroke.DrawingAttributes.Color = Colors.Black
Next stroke

' Set strokes in the collection to red 
For Each node As ContextNode In selectedNodes
    For Each stroke As Stroke In node.Strokes
        stroke.DrawingAttributes.Color = Colors.Red
    Next stroke
Next node

// Get the nodes that correspond to this start and length
ContextNodeCollection selectedNodes =
    paragraph.GetNodesFromTextRange(ref start, ref length, lastLineCollection);

// Set all strokes to black 
foreach (Stroke stroke in paragraph.Strokes)
    stroke.DrawingAttributes.Color = Colors.Black;

// Set strokes in the collection to red 
foreach (ContextNode node in selectedNodes)
{
    foreach (Stroke stroke in node.Strokes)
    {
        stroke.DrawingAttributes.Color = Colors.Red;
    }
}

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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